Reference Manual

IP2030/RM, Rev AA
June 2014

Mobrey MCU900 Series

4–20 mA + HART® Compatible Controller
Reference Manual Title Page
IP2030/RM, Rev AA June 2014

Mobrey MCU900 Series

Universal Control Unit

Read this manual before working with the product.

For personal and system safety, and for optimum product performance,
make sure you thoroughly understand the contents before installing, using,
or maintaining this product.
For the latest customer support information, visit the Mobrey brand
pages at www.emersonprocess.com, and then click on the Mobrey
Service or Product Support quick links.

The products described in this document are NOT designed for

nuclear-qualified applications.
Using non-nuclear qualified products in applications that require
nuclear-qualified hardware or products may cause inaccurate readings.
For information on Rosemount nuclear-qualified products, contact an
Emerson Process Management Sales Representative.

Replacement equipment or spare parts not approved by Emerson for use as

spare parts could reduce the capabilities of the Mobrey MCU900 Series
control unit, and may render the instrument dangerous.
 Use spare parts supplied or sold by Emerson

1
Reference Manual Table of Contents
IP2030/RM, Rev AA June 2014

Table of Contents
1Section 1: Introduction
1.1 Safety messages . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1
1.2 Manual overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2
1.3 Control unit versions and software releases . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2
1.4 Customer support . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2
1.5 Product recycling/disposal . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2

2Section 2: Control Unit Overview

2.1 Safety messages . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3
2.2 About the Mobrey MCU900 Series Control Unit. . . . . . . . . . . . . . . . . . . . . . . . . . . . .3
2.2.1 Wall and panel mounting options. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
2.2.2 4–20mA HART transmitter input options . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
2.2.3 Control functionality . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
2.3 Control unit functions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5
2.3.1 Standard functions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
2.3.2 Difference, sum, and product functions (on MCU902 only) . . . . . . . . . . . 5
2.3.3 Data logging functions (on MCU90F only) . . . . . . . . . . . . . . . . . . . . . . . . . . 5
2.4 Control unit front panel . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .6
2.4.1 Keypad . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
2.4.2 Status LED . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
2.4.3 Display . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7

3Section 3: Installation
3.1 Safety messages . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .9
3.2 Considerations before installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
3.2.1 Safety considerations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .10
3.3 Mounting the control unit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
3.3.1 Mounting the wall-mount version . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .11
3.3.2 Mounting the panel version . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .11
3.4 Electrical installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
3.4.1 Making electrical connections on wall-mount units . . . . . . . . . . . . . . . . .13
3.4.2 Making electrical connections on panel-mount units . . . . . . . . . . . . . . . .15
3.4.3 Power connections . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .16
3.4.4 Earthing connections . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .16

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3.4.5 Transmitter connections and cabling. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .16

3.4.6 Connecting HART transmitters to the Mobrey MCU902 . . . . . . . . . . . . .18
3.4.7 Relay connections . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .20
3.4.8 Current output connections . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .20
3.4.9 Digital control voltage-free contact inputs . . . . . . . . . . . . . . . . . . . . . . . . .21
3.4.10 RS232 connections . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .22

4Section 4: Getting started

4.1 Safety messages . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25
4.2 Switching on the MCU901 and MCU90F for the first time . . . . . . . . . . . . . . . . . . 26
4.2.1 Switching on with one new HART transmitter connected . . . . . . . . . . . .27
4.2.2 Switching on with one 4–20 mA transmitter connected . . . . . . . . . . . . .29
4.3 Switching on the MCU902 for the first time . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29
4.4 A quick tour of the menu system . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30
4.5 Programming the control unit. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32
4.5.1 The basics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .32
4.5.2 Step-by-step programming of the control unit . . . . . . . . . . . . . . . . . . . . .37
4.5.3 Run App and Program operating modes . . . . . . . . . . . . . . . . . . . . . . . . . . .38
4.5.4 Application Wizard . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .39
4.5.5 Optional change: system settings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .42
4.5.6 Optional change:
transmitter input channel settings (advanced users) . . . . . . . . . . . . . . . .43
4.5.7 Programming Input Channel 1 for a 4–20 mA input
(advanced users) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .44
4.5.8 Programming Channel 1 for a HART input (advanced users). . . . . . . . . .48
4.5.9 Programming Channel 2 for a HART input (MCU902 only)
(advanced users) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .50
4.5.10 Volumetric contents and flow measurement applications
(advanced users) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .52
4.5.11 Set-up the volumetric contents calculations for a
popular linear / uniform vessel (advanced users). . . . . . . . . . . . . . . . . . . .52
4.5.12 Set-up the volumetric contents calculations for a popular
non-linear / non-uniform shaped vessel (advanced users). . . . . . . . . . . .53
4.5.13 Set-up flow calculations for non-linear / non-uniform
open channel profiles (advanced users) . . . . . . . . . . . . . . . . . . . . . . . . . . .56
4.5.14 Set-up open channel flow calculations for pre-programmed flat,
parabolic, and Parshall flumes (advanced users) . . . . . . . . . . . . . . . . . . . .58
4.5.15 Set-up Kindsvater Shen (V-notch ISO1438) flow calculations . . . . . . . . .59
4.5.16 Set-up exponential flow law calculations . . . . . . . . . . . . . . . . . . . . . . . . . .59

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4.5.17 Using a plotted profile for calculating volume or flow . . . . . . . . . . . . . . .61

4.5.18 Digital inputs IN1 and IN2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .63
4.5.19 Data logging on the Mobrey MCU90F . . . . . . . . . . . . . . . . . . . . . . . . . . . . .64
4.5.20 Set-up the current output . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .68
4.5.21 Set-up the relays . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .69
4.5.22 Set-up alarms . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .91
4.5.23 Set-up totalizing on the Mobrey MCU901 control unit. . . . . . . . . . . . . . .95
4.5.24 Set-up totalizing on the Mobrey MCU902 control unit. . . . . . . . . . . . . . .97
4.5.25 Set-up totalizing on the Mobrey MCU90F control unit . . . . . . . . . . . . . . .99
4.5.26 Display configuration options . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 102
4.5.27 Serial communications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 104
4.5.28 PIN Security. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 105

5Section 5: Servicing and Health Checking

5.1 Safety messages . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 107
5.2 Servicing the MCU900 Series control unit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 107
5.2.1 Replacing the fuse on mains ac-powered control units . . . . . . . . . . . . 108
5.3 Health checking the MCU900 Series control unit . . . . . . . . . . . . . . . . . . . . . . . . 110
5.3.1 Simulation (self-test). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 110
5.3.2 Display test . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 110
5.3.3 Calibration of the Current Input (Iin). . . . . . . . . . . . . . . . . . . . . . . . . . . . . 111
5.3.4 Fixing the Current Output (Iout). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 111
5.3.5 Calibration of the Current Output (Iout). . . . . . . . . . . . . . . . . . . . . . . . . . 112
5.3.6 Monitoring the control unit readings . . . . . . . . . . . . . . . . . . . . . . . . . . . . 112
5.3.7 Diagnostic data for the MCU900 Series control unit . . . . . . . . . . . . . . . 115
5.3.8 Model code, serial number, and software and hardware revisions. . . 116

AAppendix A: Reference Data

A.1 Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 117
A.1.1 General . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 117
A.1.2 Display . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 117
A.1.3 Electrical . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 117
A.1.4 Mechanical . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 119
A.1.5 Environment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 119
A.2 Dimensional drawings. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 121

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BAppendix B: Product Certifications

B.1 Safety messages . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 123
B.2 European directive information. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 124
B.3 Hazardous locations certifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 124
B.3.1 ATEX intrinsically safe approvals . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 124
B.3.2 IECEx intrinsically safe approvals. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 124

CAppendix C: Menus and Parameters

C.1 Menus and parameters . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 125

DAppendix D: Additional Features

D.1 Restoring the factory defaults . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 135
D.1.1 How to restore the factory default settings . . . . . . . . . . . . . . . . . . . . . . 135
D.2 ADVANCED parameter access . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 136

EAppendix E: Support for HART® Transmitters

E.1 Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 139
E.2 Fully supported HART transmitters. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 139
E.3 Generic support for HART transmitters . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 139
E.3.1 Compatibility between transmitter and control unit . . . . . . . . . . . . . . 139
E.3.2 Universal and common practice commands . . . . . . . . . . . . . . . . . . . . . 140

6Index

TOC-iv Table of Contents

Reference Manual Section 1: Introduction
IP2030/RM, Rev AA June 2014

Section 1 Introduction

Safety messages . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . page 1

Manual overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . page 2
Control unit versions and software releases . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . page 2
Customer support . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . page 2
Product recycling/disposal . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . page 2

1.1 Safety messages

Procedures and instructions in this manual may require special precautions to ensure the safety
of the personnel performing the operations. Information that raises potential safety issues is
indicated by a caution symbol ( ). The external hot surface symbol ( ) is used when a surface
is hot and care must be taken to avoid possible burns. If there is a risk of an electrical shock the
( ) symbol is used. Refer to the safety messages listed at the beginning of each section before
performing an operation preceded by this symbol.

Failure to follow these installation guidelines could result in death or serious injury:
 The Mobrey MCU900 Series Control Unit must be installed, connected,
commissioned, operated, and maintained by suitably qualified personnel only,
observing any national and local requirements that may apply
 Use the equipment only as specified in this manual. Failure to do so may impair the
protection provided by the equipment
Explosions could result in death or serious injury:
 Please review the approvals section of this reference manual for any restrictions
associated with an installation
Electrical shock could cause death or serious injury:
 If the control unit is installed in a high voltage environment and a fault condition or
installation error occurs, high voltage may be present on leads and terminals
 Use extreme caution when making contact with the leads and terminals
 Make sure that power to the control unit is off while making connections

Section 1: Introduction 1
Section 1: Introduction Reference Manual
June 2014 IP2030/RM, Rev AA

1.2 Manual overview

This manual provides installation, configuration and maintenance information for the
Mobrey MCU900 Series control unit.

Section 2: Control Unit Overview

Section 3: Installation

Section 4: Getting started

Section 5: Servicing and Health Checking

Appendix A: Reference Data

Appendix B: Product Certifications

Appendix C: Menus and Parameters

Appendix D: Additional Features

Appendix E: Support for HART® Transmitters

1.3 Control unit versions and software releases

The following control unit versions are covered in this product manual:
 Mobrey MCU901 Standard Control Unit
 Mobrey MCU902 Differential Control Unit
 Mobrey MCU90F Logging Control Unit

The software release covered in this product manual is issue 4.00.00 (and above).

1.4 Customer support

For the latest customer support information, visit the Mobrey brand pages at
www.emersonprocess.com, and then click on the Mobrey Service or Product Support
quick links.

1.5 Product recycling/disposal

Recycling of equipment and packaging should be taken into consideration. The product and
packaging should be disposed of in accordance with local and national legislation.

2 Section 1: Introduction
Reference Manual Section 2: Control Unit Overview
IP2030/RM, Rev AA June 2014

Section 2 Control Unit Overview

Safety messages . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . page 3

About the Mobrey MCU900 Series Control Unit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . page 3
Control unit functions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . page 5
Control unit front panel . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . page 6

2.1 Safety messages

Procedures and instructions in this manual may require special precautions to ensure the safety
of the personnel performing the operations. Information that raises potential safety issues is
indicated by a caution symbol ( ). The external hot surface symbol ( ) is used when a surface
is hot and care must be taken to avoid possible burns. If there is a risk of an electrical shock the
( ) symbol is used. Refer to the safety messages listed at the beginning of each section before
performing an operation preceded by this symbol.

2.2 About the Mobrey MCU900 Series Control Unit

Note
 A full specification for the control unit is in Appendix A: Reference Data.

2.2.1 Wall and panel mounting options

The wall mounting option has a tough, weatherproof enclosure for internal or external
installation.

The panel mounting option has a black enclosure, and is designed for control room panel or
cabinet installation.

Figure 2-1. Mounting options

Wall Mount Panel Mount

Section 2: Control Unit Overview 3

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June 2014 IP2030/RM, Rev AA

2.2.2 4–20mA HART transmitter input options

4–20mA HART transmitter input options:
 The Mobrey MCU901 Standard control unit and the Mobrey MCU90F Logging control
unit accepts one 4–20mA or HART transmitter input
 The Mobrey MCU902 Differential control unit accepts two HART transmitter inputs

Note
 The Mobrey MCU900 Series is designed for non-hazardous (safe) area installation, but
can be connected to a transmitter installed in a hazardous area.
See Appendix B: Product Certifications for the control unit certifications.

2.2.3 Control functionality

Control functionality is provided by five SPDT voltage-free contact relays in the control unit
(see Figure 2-2 on page 4). The five relay outputs are fully field adjustable to perform a wide
variety of control, fault indication, or alarm duties.

For applications where the control unit functionality is linked to other external events, there are
two digital input ports for accepting contact closure signals.

The isolated 4–20 mA signal output from the Current Output of the control unit is driven by a
Primary / Process Value (PV) e.g. level.

Figure 2-2. Typical application using a Mobrey MCU900 Series control unit

A
G
C

D D

20mA
E E
F

4mA

A. Mobrey MSP Series Level Transmitter E. Pump

B. Mobrey MCU900 Series Control Unit F. Transmitter Bottom Reference
C. 4–20 mA signal output G. 4–20 mA and HART signal input
D. Relay

4 Section 2: Control Unit Overview

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IP2030/RM, Rev AA June 2014

2.3 Control unit functions

2.3.1 Standard functions
The Mobrey MCU900 Series control unit provides these standard functions:
 Calculation and display of the control unit Primary / Process Value (PV)
The control unit PV is typically a live transmitter reading, which can be any measured
value e.g. level, temperature, or pressure.
Alternatively, the control unit PV is a volume or flow value calculated using the live
transmitter level reading. The control unit is pre-programmed with standard tank
shapes and flow algorithms to simplify the configuration for calculating volume or flow
from the live transmitter level reading. A 20-point programmable look-up table is
provided for non-standard applications.
 Output of measured variable as an isolated 4–20mA signal
The output signal is driven by the control unit Primary / Process Value (PV).
 Relay control functions
There are five freely assignable relay outputs. By default, Relay 5 is a fault relay but can
be assigned to a control duty. The other relays are available to operate at user-entered
PV values.
The control unit is pre-programmed with popular pump control routines for wet well
and sump control, along with energy saving overrides.
 Voltage-free (digital) contact closure inputs
There are two digital input ports for accepting contact closure signals to override
control unit functions.
 HART transmitter interrogation and programming
Any HART transmitter can be connected. The control unit recognizes the transmitter as
an “unknown instrument” but supports the Universal and Common Practice HART
commands (see Appendix E: Support for HART® Transmitters).
When a Mobrey MSP Series HART transmitter is connected, the control unit recognizes
the transmitter and allows full access to the transmitter’s configuration parameters.
Refer to the reference manual of the transmitter for full information about
programming the transmitter parameters (e.g. Transmitter Bottom Reference) using
the MCU900 Series control unit or other HART-based devices.

2.3.2 Difference, sum, and product functions (on MCU902 only)

The Mobrey MCU902 Differential control unit has all the functions of the standard control unit,
plus extra functions for calculating the difference, sum, or product of two separate inputs from
HART transmitters.

2.3.3 Data logging functions (on MCU90F only)

The Mobrey MCU90F Logging control unit has all the functions of the standard control unit, plus
a 7000 event logging function.

Section 2: Control Unit Overview 5

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June 2014 IP2030/RM, Rev AA

2.4 Control unit front panel

This front panel fascia has an integral keypad, display, and health status LED.

Figure 2-3. Front panel fascia

A

12:47 RL1
IN1 RL2
IN2 1.572 m RL3
RL4
MCU RL5

B C

Esc

A. 4-line Back-lit LCD Display

B. Status LED
C. Keypad

2.4.1 Keypad
The membrane keypad has six function buttons (Table 2-1). The buttons are used for navigating
a menu system and for viewing or changing application parameters.

Table 2-1. Keypad Function Buttons

Button What the button will do

When the Primary / Process Value (PV) is shown, use the red (ENTER) button to access the menu system.
At other times, this button is for selecting a menu option and for confirming something.

When navigating the menu system, the UP-ARROW button is for moving upwards one line.
At other times, this button is for scrolling through a list of alphanumeric characters or a list of options.
When navigating the menu system, the DOWN-ARROW button is for moving downwards one line.
At other times, this button is for scrolling through a list of alphanumeric characters or a list of options.

The LEFT-ARROW button is for moving left e.g. to another character when editing a parameter value.

The RIGHT-ARROW button is for moving right e.g. to another character when editing a parameter value.

When navigating the menu system, use the ESCAPE button to return to a previous menu level and the
Full PV Display. At other times, e.g. while editing, the button is for restoring a setting that is being edited.

2.4.2 Status LED

The LED is positioned just below the LCD (Figure 2-3 on page 6). It flashes once per second to
indicate that the control unit and transmitters are operating correctly. The LED is constantly lit if
there are operating difficulties e.g. a transmitter fault.

6 Section 2: Control Unit Overview

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2.4.3 Display
After the power-up and self-checks are completed, the Full PV Display is presented.
The default Full PV Display typically features a digital clock, a measured variable with display
units, and status icons. There are some display differences between control units:
 On the MCU901 and MCU902, a bar graph indicates the 4–20mA output signal.
(The MCU90F display can be changed to show the bar graph).
 On the MCU902, an extra icon on the first line and indicates if one or two HART
transmitters connected to the control unit.
 On the MCU90F, there are two totalizers displayed; one above and one below the
control unit Primary / Process Value (PV).

Figure 2-4. Typical displays of the MCU901, MCU902, and MCU90F

C
B
Mobrey MCU901

F
E D

G
H Mobrey MCU902

K I
Mobrey MCU90F

A. Program/Run App mode (locked padlock = Run App mode) H. HART Transmitter Communicating
B. HART Transmitter Communicating (absent if Idle) (1=Tx1, 2=Tx2)
C. Relay (RL) Status: O = De-energized,= Energized, I. Relay (RL) Status: O = De-energized,= Energized,
A = Alarm, S = Sampler, T = Totalizer A = Alarm, S = Sampler, T = Totalizer
D. Primary / Process Value (PV) of Control Unit J. Totalizer 1
E. Bar graph of 4–20mA Output K. Totalizer 2 (Daily Total)
F. Digital Input Status: O = Open,= Closed
G. HART Transmitter Allocated:
Left Vertical Bar = Tx1; Right Vertical Bar = Tx2

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After a period of keypad inactivity, the display automatically changes to the Large PV Display.
This shows only the control unit Primary / Process Value (PV) and Display units, but in a larger
character size to facilitate easier viewing.

To restore the Full PV Display, press the red (ENTER) button.

Note
 The Large PV Display feature can be switched off using parameter P574.
See “Display configuration options” on page 102.

Figure 2-5. Large PV Display

Large PV Display

1.572 m
1 12:47
1.572 m
Full PV Display

8 Section 2: Control Unit Overview

Reference Manual Section 3: Installation
IP2030/RM, Rev AA June 2014

Section 3 Installation

Safety messages . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . page 9

Considerations before installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . page 10
Mounting the control unit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . page 11
Electrical installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . page 13

3.1 Safety messages

Procedures and instructions in this manual may require special precautions to ensure the safety
of the personnel performing the operations. Information that raises potential safety issues is
indicated by a caution symbol ( ). The external hot surface symbol ( ) is used when a surface
is hot and care must be taken to avoid possible burns. If there is a risk of an electrical shock the
( ) symbol is used. Refer to the safety messages listed at the beginning of each section before
performing an operation preceded by this symbol.

Failure to follow these installation guidelines could result in death or serious injury:
 The Mobrey MCU900 Series control unit must be installed, connected,
commissioned, operated, and maintained by suitably qualified personnel only,
observing any national and local requirements that may apply
 Use the equipment only as specified in this manual. Failure to do so may impair the
protection provided by the equipment
Explosions could result in death or serious injury:
 Please review the approvals section of this reference manual for any restrictions
associated with an installation
Electrical shock could cause death or serious injury:
 If the control unit is installed in a high voltage environment and a fault condition or
installation error occurs, high voltage may be present on leads and terminals
 Use extreme caution when making contact with the leads and terminals
 Make sure that power to the control unit is off while making connections

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3.2 Considerations before installation

Note
The Mobrey MCU900 Series is designed for non-hazardous (safe) area installation, but can
power and take input from an intrinsically safe transmitter installed in a hazardous area.
See Appendix B: Product Certifications for the control unit certifications.

3.2.1 Safety considerations

Guidelines
1. This product is classified type A in accordance with European EMC directive
2004/108/EC. To ensure electro-magnetic compatibility, in any member country, this
product should not be installed in a residential area.

2. Do not mount the control unit on a structure that is subject to vibration, or in a position
where damage may be caused by impact, thermal stress or liquid ingress.

3. The fuse must only be replaced with the type specified (see page 108 for procedure).

4. If the equipment is likely to come into contact with aggressive substances, it is the
responsibility of the user to take suitable precautions that prevent it from being
adversely affected, thus ensuring that the type of protection is not compromised.
Aggressive Substances - e.g. acidic liquids or gases that may attack metals or solvents
that may affect polymeric materials.
Suitable Precautions - e.g. regular checks as part of routine inspections or establishing
from the material's data sheet that it is resistant to specific chemicals.

5. The user should not repair this equipment.

6. Terminal 30 (intrinsically safe earth/ground) of the control unit must be connected to a

high integrity earth/ground point.

7. A mains powered Control Unit must not be connected to a supply exceeding 250 V
r.m.s. or dc, or to apparatus containing a source of voltage exceeding 250 V r.m.s. or dc.

8. A direct current (dc) powered control unit must not be connected to a supply
exceeding 30 Vdc or apparatus containing a source of voltage exceeding 30 Vdc.

9. The intrinsically safe outputs of the control unit may be connected to certified
equipment used in a hazardous area. Refer to Appendix B: Product Certifications for
details of relevant certifications.

10. Cable between the MCU900 Series control unit and a transmitter should be shielded,
twisted-pair with the shield connected to terminal 3 (marked with earth symbol) on the
MCU900 Series control unit. The shield should be left unconnected at the transmitter
unless there is a terminal specifically provided for this purpose.

11. Cable runs should be separate from any high voltage or mains cables to avoid crosstalk
or interference.

12. Refer to the technical data in Appendix A: Reference Data.

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3.3 Mounting the control unit

3.3.1 Mounting the wall-mount version
Guidelines
 This housing is rated IP65. It is suitable for mounting outside, but this should be above
any flood level, away from any overflow path, and away from direct sunlight
 Do not mount the control unit on a structure that is subject to vibration, or in a position
where damage may be caused by impact, thermal stress, or liquid ingress
 The mass of the mains powered unit is 1.4 kg, and the DC powered unit is 1.0 kg.
To conform with safety requirements, the wall on which the unit is mounted should be
capable of supporting four times this weight
 It is not necessary, or advisable, to remove the upper part of the unit housing that
contains the LCD and keypad. There are no user serviceable parts inside. The unit must
not be modified in any way

Procedure
1. Mount the unit on a suitable wall or structure using the fixing points shown on
Figure A-1 on page 121.

2. Make the electrical connections

(see “Making electrical connections on wall-mount units” on page 13).

3.3.2 Mounting the panel version

Guidelines
 This housing is rated IP40 and is designed for panel mounting in a weatherproof
environment. An optional fascia overlay hood is available which improves the IP rating
to IP65 – see Product Data Sheet IP2031 on the Mobrey brand pages at
www.emersonprocess.com for ordering information

 Do not mount the control unit on a structure that is subject to vibration, or in a position
where damage may be caused by impact, thermal stress, or liquid ingress
 Where three of more units are fitted in the same cabinet or panel, ensure that there is
adequate air circulation to aid cooling. It is recommended that an air circulation fan be
fitted
 The unit requires at least 6.5 in. (165 mm) clearance behind the mounting panel to
avoid cable fouling
 After mounting the control unit, all wiring is made at the rear of the unit using the two
part terminal blocks provided. (A pre-wired data download socket suitable for front
panel mounting is provided on the MCU90F)
 Mount the control unit on a panel with thickness 1.5 to 10 mm, ensuring the panel is
strong enough to support the 2.6 lb. (1.2 kg) weight of the unit
 Ensuring there is enough clearance behind the chosen position in the panel (6.5 in [165
mm] minimum), cut a horizontal slot 5.43 in. (138 mm) long by 2.68 in. (68 mm) high
in the panel and remove any rough edges

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Procedure

1. Unpack the two screw clips provided.

2. Identify the moulded lugs (protrusions) in the recesses on each side of the control unit.
(Ignore the recesses on the top and bottom of the unit).

3. Holding the screwdriver-slot-end of the threaded spindle of one of the screw clamps
and looking at the control unit rear, engage a screw clamp frame onto the control unit
side (see Figure 3-1 on page 12) and see how the four steel lugs (protrusions) of the
screw clamp frame engage with the moulded lugs of the unit. Gently pull the screw
clamp for the lugs to engage with each other.

4. Remove the screw clamps from both of the screw clamp frames.

5. Slide the control unit into the panel, ensuring that the panel seal provided is in place
behind the front panel bezel.

6. Re-fit the screw clamps, one on each side, and tighten with a screwdriver to clamp the
control unit against the panel.

7. For electrical connections,

see “Making electrical connections on panel-mount units” on page 15.

Figure 3-1. The fitted screw clamp

A. Screw Clamp Frame

B. Front Panel Bezel
C. Screw Clamp With Threaded Spindle

12 Section 3: Installation
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3.4 Electrical installation

It is the responsibility of the installer to:

 Refer to safety data and electrical specifications in Appendix A: Reference Data
 Refer to the certifications and control drawings in Appendix B: Product Certifications
 Check and obtain any work permits required before applying power to the unit
 Observe all local regulations and approval requirements
 Ensure the wiring is suitable for the load current
 Ensure the wiring insulation is suitable for the voltage, temperature, and environment
of the installation
 Ensure suitable cable glands or conduit connections are used when wiring to the
control unit to maintain enclosure integrity
Never remove or modify the mechanical barriers separating the terminal area from the
main enclosure and separating the transmitter input terminals from other terminals.

3.4.1 Making electrical connections on wall-mount units

All field wiring connections are accessible by removing the lower terminal cover, which is
secured by two screws on the wall-mount control unit.

The cabling between the Mobrey MCU900 Series control unit and a transmitter should be a
screened (shielded), twisted-pair type with the cable screen (shield) connected to terminal 3
(marked with earth/ground symbol) on the Mobrey MCU900 Series control unit. The cable
screen (shield) should be left unconnected at the transmitter end unless there is a terminal
specifically provided for this purpose.

Cable runs should be separate from any high voltage or mains cables to avoid crosstalk or
interference.

Figure 3.4.2 on page 15 shows the layout of the control unit terminals. All terminal blocks are
suitable for wires 14 to 26 AWG (0,5 to 1,5 mm), except the mains terminals which are suitable
for wires 10 AWG (2,5 mm). Insulation should be stripped back 1/4 in. (7 mm).

Transmitter connections are made on the left side of the terminals enclosure. The intrinsically
safe earth/ground (terminal 30) must be connected to a high integrity earth/ground point if the
transmitter connected to terminals 1 and 2 is sited in a hazardous area.

Note
 Use only 167 F (75 C) copper conductors for field wiring.

Note
 In intrinsically safe systems, apparatus connected to the MCU900 Series control unit
must not be supplied from a voltage greater than 250V r.m.s. or 250 Vdc.

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Figure 3-2. Connection terminals layout (for mains-powered wall-mount unit)

1 2 3 4 5 6 7 8 9 13 14 15 19 20 21 25 26 27 28 29 30
24V I in RX TX 0V 24V Iout 0V NO COM NC NO COM NC NO COM NC L N FUSE 200mA (T)

10 11 12 16 17 18 22 23 24 IS EARTH
IN1 IN2 0V NO COM NC NO COM NC

(The direct current (dc) powered unit has a slightly different layout – terminals 31 and 32 replace terminals 28 and 29).

Table 3-1. Connection terminal descriptions (for wall-mount unit)

Terminal Function Terminal marking
1 Loop supply 24V
2 Current input Iin
3 Cable screen Earth (Earth symbol)
4-6 RS232 RX-TX-0V
7-9 Current output 24V-Iout-0V
10-12 Digital input 1 and 2 IN1-IN2-0V
13-15 Relay 1 NO-COM-NC
16-18 Relay 2 NO-COM-NC
19-21 Relay 3 NO-COM-NC
22-24 Relay 4 NO-COM-NC
25-27 Relay 5 NO-COM-NC
28-29 (1) Mains input L-N
30 I.S. Earth/Ground (Earth/Ground symbol)
31 (2) Negative -
32 (2) Positive +
(1) Mains-powered control unit only.
(2) Direct current (dc) powered control unit only.

Cable glands for the wall-mount unit

The five cable-entry positions are pre-drilled to accept M20 cable glands. The Mobrey MCU90F
control unit has a data download socket factory pre-fitted in one of these cable-entry positions.

Two cable glands, rated IP65 and suitable for cable with outside diameter 4 to 7 mm, are
supplied for use with the mains supply and transmitter cable. M20 blanking plugs are supplied
for the other three cable entry positions.

All glands and blanking plugs are supplied in a plastic bag. The installer must fit these, or
suitable equivalents, in place of the transit red-caps, to ensure weatherproofing of the control
unit. The white sealing washers supplied with the cable glands and blanking plugs must be fitted
on the outside of the enclosure under gland/blanking plug.

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3.4.2 Making electrical connections on panel-mount units

Field wiring connections are made to the back of the panel-mount control unit using the
two-part (plug/socket) terminal connectors provided. Figure 3-3 shows the rear panel layout.

Note
 The plug/socket terminal connectors on the panel mount unit are polarized (keyed)
to prevent inter-changeability and incorrect connection.

Cabling between the Mobrey MCU900 Series control unit and a transmitter should be a
screened (shielded), twisted-pair type with the cable screen (shield) connected to terminal 3
(marked with earth/ground symbol) on the control unit. The cable screen (shield) should be left
unconnected at the transmitter end unless there is a terminal specifically provided for this
purpose. Cable runs should be separate from any high voltage or mains cables to avoid crosstalk
or interference.

Connect terminal 30 (intrinsically safe earth/ground) to a high integrity earth/ground point if

the transmitter connected to terminals 1 and 2 is sited in a hazardous area.

Figure 3-3. Connection terminals layout (for mains-powered panel-mount unit)

(The direct current (dc) powered unit has a slightly different layout – terminals 31 and 32 replace terminals 28 and 29).

Table 3-2. Connection descriptions for panel mount unit

Terminal Function Terminal marking
1 Loop supply 24V
2 Current input Iin
3 Cable screen Earth (Earth symbol)
4-6 RS232 RX-TX-0V
7-9 Current output 24V-Iout-0V
10-12 Digital input 1 and 2 IN1-IN2-0V
13-15 Relay 1 NO-COM-NC
16-18 Relay 2 NO-COM-NC
19-21 Relay 3 NO-COM-NC
22-24 Relay 4 NO-COM-NC
25-27 Relay 5 NO-COM-NC
28-29 (1) Mains input L-N
30 I.S. Earth (Earth symbol)
31 (2) Negative -
32 (2) Positive +
(1) Mains-powered control unit only.
(2) Direct current (dc) powered control unit only.

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3.4.3 Power connections

When the control unit is powered by mains alternating current (ac) power, select the voltage as
115V or 230V using the voltage-selector slide switch.

When the control unit is direct current (dc) powered, ensure the supply is adequate (15 to 30
Vdc). Do not exceed 30 Vdc.

A switch or circuit breaker should be installed in close proximity to the instrument, and labelled
as such. Although the Mobrey MCU900 Series control unit meets all European standards for
surge immunity on power and signal lines, it is recommended that lightning suppressors are
also fitted if local conditions make this advisable.

3.4.4 Earthing connections

The IP-rated Mobrey MCU900 Series control unit is double insulated and does not require a
mains earth.

Do not connect terminal 30 to a mains earth. Terminal 30 is provided for use as an intrinsically
safe (or functional) earth connection, which must be used when a transmitter is mounted in a
hazardous area and is connected to terminals 1 and 2.

Terminal 3 is to be used for connection of a twisted-pair cable screen (shield) when the control
unit is powering the transmitter (see Figure 3-4 on page 17). This screen (shield) should be left
unconnected at the transmitter end unless there is a terminal provided for this purpose.

When connected to equipment located in a hazardous area, not meeting the requirements of
clause 6.3.12 (Isolation of circuits from earth or frame) in IEC 60079-11:2006
(EN 60079-11:2007), equipotential earthing must be ensured between the equipment and the
intrinsically safe earth. An example of equipotential earthing is a cable with a cross-sectional
area greater than 4 mm2 and a resistance of less than 1 ohm.

3.4.5 Transmitter connections and cabling

Connection of a transmitter to the control unit does not confer intrinsic safety on the
transmitter. It is the responsibility of the user to ensure any transmitter installed in a hazardous
area is suitable for use and certified accordingly. The installation should be in accordance with a
recognized code of practice.

Check that the electrical parameters of the installed system of control unit, transmitter, any
loop-powered devices, and interconnecting cable to ensure compliance with the product
certificates and technical data. Particular attention must be given to the cable and the
transmitter to ensure that the total capacitance and inductance limits stated in the technical
data in Appendix B: Product Certifications are not exceeded.

Cable joins are allowable in cabling the transmitter, provided that the joint is made within an
IP20/NEMA 3 (minimum) enclosure suitable for the environment, and that wiring withstands a
test voltage of 500 V r.m.s. to earth.

The maximum length of cable permissible between the transmitter and control unit is
determined by limits imposed by the intrinsic safety certificates of the instruments and control
drawings.

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No other outputs from the control unit must be routed through a hazardous area unless
protected by an additional I.S. Barrier (not supplied).

It is the responsibility of the user to ensure that any transmitter is installed in accordance with
the manufacturer’s instructions supplied with the transmitter.

Cable between the MCU900 Series control unit and a transmitter should be shielded
twisted-pair with the shield connected to terminal 3 (marked with earth symbol) on the
MCU900 Series control unit. The shield should be left unconnected at the transmitter unless
there is a terminal specifically provided for this purpose.

Cable runs should be separate from any high voltage or mains cables to avoid crosstalk or
interference. Multi-core cable may be used if the other cores carry only low voltage (24 Vdc
nominal) signals and each pair of cores is individually screened (shielded).

Loop-powered transmitters must be connected to terminals 1, 2, and 3 on the control unit

(see Figure 3-4).

The MCU900 Series control unit supplies 23 Vdc from a 400 Ohm source to power transmitters.
Separately powered transmitters must be connected to terminals 2 and 3 (see Figure 3-5).

Figure 3-4. Loop-powered transmitter connections to MCU900 Series control unit

A B
24 V 1
IIN 2
3
A. Control unit
B. Transmitter

Figure 3-5. Self-powered transmitter connections to MCU900 Series control unit

A
B
24 V 1
IIN 2
3

A. Control unit
B. Transmitter

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3.4.6 Connecting HART transmitters to the Mobrey MCU902

The Mobrey MCU902 control unit takes the input from two HART transmitters and calculates
the sum, difference, or product of the two inputs.

Note
 The transmitters must be HART compatible for the MCU902 to operate correctly.

Connection of the two transmitters to the MCU902 can be done by:

 cabling both transmitter cables wired directly into Current Input terminals on the
MCU902 (Figure 3-6), or
 using a single cable wired directly into Current Input terminals with the two
transmitters connected to this single cable via a suitable junction box (Figure 3-6).

Figure 3-6. Connecting two HART transmitters to the Mobrey MCU902

A C A

1 1
2 2
3 3

B B
A. HART Transmitter Tx1
B. HART Transmitter Tx2
C. Junction box

For correct operation, each HART transmitter must be changed to “multi-drop” mode to allow
them to communicate with the Mobrey MCU902 control unit through a common connection.
Each HART transmitter must therefore have their poll address changed from the factory default
address of “0” to a unique address.

The MCU902 control unit is used to achieve this address change, but requires the transmitters
to be connected in a specific sequence as detailed here:

1. With the power supply turned off, connect the first HART transmitter to the Current
Input terminals on the MCU902 control unit (see Figure 3-6).

2. Check the voltage-selector-switch is set for the correct voltage on the

mains-powered control unit (115 or 230 Vac), and then turn the power on.

3. After applying power, the control unit searches for a HART transmitter.
A HART transmitter with the factory default polling address of 0 is found after 15
seconds. The control unit automatically changes the Transmitter Poll Address from “0”
to “1” and it is designated “Tx1” (Transmitter 1) and assigned to Channel 1.
The control unit reads parameters from the HART transmitter and makes them
available for local interrogation and programming within the menu system.

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4. When an un-configured Mobrey MSP Series Level Transmitter is being used for the first
time, a prompt appears asking for the Transmitter [1] Bottom Reference.
If commissioning the system now, edit and save a new Transmitter Bottom Reference or
keep the existing Transmitter Bottom Reference. After the start-up process is complete,
the display appears showing a measurement e.g. liquid level or the menu system.
If the system is not to be commissioned at this time, simply switch off the power and
the same prompt re-appears when switching on the power next time. The Transmitter
Bottom Reference can be changed later, but it is better to get it correct now.

Note
 If the Re-connecting to Digital Transmitter message does not appear, check that the
operating mode of the control unit is set to Run App mode (see page 38) and that the
Input Channel Source is set for a digital HART input (see page 48 or page 50)

5. Turn the power supply off and connect the second HART transmitter (see Figure 3-6),
such that both HART transmitters are connected at the same time.

6. Turn the power supply on.

7. The MCU902 control unit searches for, and detects, the two connected HART
transmitters.
After the second HART transmitter is found, the control unit automatically changes the
Transmitter Poll Address from “0” to “2” and it is designated “Tx2” (Transmitter 2) and
assigned to Channel 2.
The control unit reads parameters from the HART transmitter and makes them
available for local interrogation and programming within the menu system.

8. When an un-configured Mobrey MSP Series Level Transmitter is being used for the first
time, a prompt appears asking for the Transmitter [2] Bottom Reference.
If commissioning the system now, edit and save a new Transmitter Bottom Reference or
keep the existing Transmitter Bottom Reference. After the start-up process is complete,
the display appears showing a measurement e.g. liquid level or the menu system.
If the system is not to be commissioned at this time, simply switch off the power and
the same prompt re-appears when switching on the power next time. The Transmitter
Bottom Reference can be changed later, but it is better to get it correct now.

9. The two HART transmitters are now known to the control unit, and will be remembered
each time the power is switched off and on.

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3.4.7 Relay connections

The five voltage-free contact relays are grouped as shown in Table 3-3. Whilst each relay is
individually double-insulated, their arrangement is such that the insulation between relays in
the same group is standard or ‘basic’ insulation. Care must be taken in order to avoid the risk
of electric shock. It is allowed to use relays in the same group to control circuits with both mains
and dc, or low voltage circuits.

Note
 The relay labels (NO-C-NC) in Table 3-1 and Table 3-2 represent the relay terminals in
the de-energized state.

Table 3-3. Relay configuration groups

Wall Mount MCU900 Series control unit Panel Mount MCU900 Series control unit
Relay 1 and 2: Group 1 Relay 1, 2 and 3 : Group 1
Relay 3 and 4 : Group 2 Relay 4 and 5 : Group 2
Relay 5: Group 3

3.4.8 Current output connections

The Current Output may be connected in internally-powered or loop-powered mode, as shown in
Figure 3-7. In loop-powered mode, an external power source is required. A minimum of 2.5 V dc
is required across terminals 7 and 8 for correct operation. The voltage must not exceed 30 Vdc.

Figure 3-7. Alternative output current configurations

24V 24V
7 7

+
External
Supply
Io Io -
8
+ 8
+
Load Load
0V - 0V -
9 9

Internally Powered Loop Powered

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3.4.9 Digital control voltage-free contact inputs

There are two trigger inputs, IN1 and IN2. Each input is connected as shown in Figure 3-8.

Figure 3-8. Connections for external trigger input

IN
External 10 or 11
Contact
Closure 0V
12

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3.4.10 RS232 connections

The RS232 connections, terminals 4, 5 and 6, are for downloading logged data to a PC or a
handheld device.
 Wall-mountable Mobrey MCU90F control units are supplied with a factory pre-fitted
RS232 data-download socket, which is also pre-wired to terminals 4, 5, and 6.
 The panel-mountable Mobrey MCU90F control unit is supplied with a data-download
socket ready to be fitted to a panel (see Figure 3-9 on page 22) and then wired to
terminals 4, 5, and 6 on the rear of the control unit (see Figure 3-10 on page 23).

When there is data to be downloaded using Mobrey LOG-VIEW or other software, connect the
RS232 data-download cable supplied with the socket (see Figure 3-11 on page 23).

Figure 3-9. Fitting the RS232 data-download socket to a panel

Cut-out the hole in the panel to the dimensions

shown in Figure A-2 on page 122.

Note A

Note B

Use the supplied mini-B nut to secure the socket to the panel.

A. RS232 socket with cap fitted.

B. RS232 socket flying lead.

22 Section 3: Installation
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Figure 3-10. Wiring the socket flying lead to terminals 4, 5, and 6 (panel mount unit)

4: Rx (White)
5: Tx (Red)
6: 0V (Black)

Figure 3-11. Connecting the RS232 data-download cable supplied with the socket

Note A

Note B

Note C

A. RS232 data-download cable.

B. Unscrewed socket cap.
C. See Mobrey LOG-VIEW manual IP130 for further information on downloading logged data.

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24 Section 3: Installation
Reference Manual Section 4: Getting started
IP2030/RM, Rev AA June 2014

Section 4 Getting started

Safety messages . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .page 25

Switching on the MCU901 and MCU90F for the first time . . . . . . . . . . . . . . . . . . . . page 26
Switching on the MCU902 for the first time . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . page 29
A quick tour of the menu system . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . page 30
Programming the control unit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . page 32

4.1 Safety messages

Procedures and instructions in this section may require special precautions to ensure the safety
of the personnel performing the operations. Information that raises potential safety issues is
indicated by a warning symbol ( ). Refer to the safety messages listed at the beginning of each
section before performing an operation preceded by this symbol.

Failure to follow these installation guidelines could result in death or serious injury:
 The Mobrey MCU900 Series control unit must be installed, connected,
commissioned, operated, and maintained by suitably qualified personnel only,
observing any national and local requirements that may apply
 Use the equipment only as specified in this manual. Failure to do so may impair the
protection provided by the equipment
Explosions could result in death or serious injury:
 Please review the approvals section of this reference manual for any restrictions
associated with an installation
Electrical shock could cause death or serious injury:
 If the control unit is installed in a high voltage environment and a fault condition or
installation error occurs, high voltage may be present on leads and terminals
 Use extreme caution when making contact with the leads and terminals
 Make sure that power to the control unit is off while making connections

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4.2 Switching on the MCU901 and MCU90F for the

first time
The Mobrey MCU901 and MCU90F control units accept the input from a single HART or
4–20 mA transmitter. Connect the transmitter to the Current Input terminals on the control
unit as explained in the section “Electrical installation” on page 13.

Figure 4-1. The Mobrey MCU901 or MCU90F control unit with one transmitter

A
G
C

D D

20mA
E E
F

4mA

A. Mobrey MSP Series Transmitter E. Pump

B. Mobrey MCU900 Series Control Unit F. Transmitter Bottom Reference
C. 4–20 mA signal output G. 4–20 mA and HART signal input
D. Relay

26 Section 4: Getting started

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4.2.1 Switching on with one new HART transmitter connected

After applying power, the control unit first displays the control unit version e.g. MCU901 and the
software version. It then automatically searches for a HART transmitter.

Figure 4-2. Searching for a HART transmitter after applying power

Re-connecting to (start of search)

Digital Transmitter
Please Wait Re-connecting to (after 3 seconds)
Digital Transmitter
Please Wait Re-connecting to (after 15 seconds)
Digital Transmitter
Please Wait

A HART transmitter with the factory default polling address of 0 is found after 15 seconds.
When found by the controller, it is designated “Tx1” (Transmitter 1) and assigned to Channel 1.

However, if the polling address is in the range 1 to 15, a prompt appears allowing the polling
address and the tag name to be changed. This is optional, and pressing the red (ENTER) button
continues the start-up process.

At this time, the control unit reads parameters from the HART transmitter and makes them
available for local interrogation and programming within the menu system of the control unit.

When an un-configured Mobrey MSP Series Level Transmitter is being used for the first time, a
prompt appears asking for the Transmitter Bottom Reference (Figure 4-3). This value is used
to automatically set-up the 4–20 mA output span of the transmitter over this range.

If the system is not to be commissioned at this time, simply switch off the power and the same
prompt re-appears when switching on the power next time. The Transmitter Bottom Reference
can be changed later, but it is better to get it correct now.

If commissioning the system now, edit and save a new Transmitter Bottom Reference or
keep (save) the existing Transmitter Bottom Reference (Figure 4-3).

Note
 If the Re-connecting to Digital Transmitter message does not appear, check that the
operating mode of the control unit is set to Run App mode (see page 38) and that the
Input Channel Source is set for a digital HART input (see page 48 or page 50)

After the start-up process is complete, the display appears showing a measurement e.g. liquid
level or the menu system. The value on the display is the Primary / Process Variable (PV) of the
control unit, but this can be changed (see “Display configuration options” on page 102).

Whenever power is lost and restored, the control unit re-establishes digital communications
with the HART transmitter and the PV display re-appears.

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Figure 4-3. Prompts for Transmitter Bottom Reference

Re-connecting to
Digital Transmitter
Please Wait
Bottom Reference =
distance to sensor
(Continue)
from tank bottom
=Continue
Note A
Edit Transmitter
Bottom Reference ?
(No) Esc (Yes)
12.000 m
ESC=No =Yes

(Back) to edit x4 x2 x5
Save Esc
Bottom Reference ? (No) Esc Bottom Reference (06.500 m)
12.000 m 5
06.500 m
ESC=No =Yes ESC=Back =Save
Note B
(Yes) Save new
Bottom Reference ?
Esc (Yes)
06.500 m
(No) ESC=No =Yes

Bottom Reference
(No) Esc saved. (Yes)
Setup controller ?
ESC=No =Yes

Controller MAIN Controller SETUP

menu appears menu appears –
Use App Wizard
(see page 39)

A. Default Bottom Reference as read from a Mobrey MSP900FH Transmitter configured with metric base units. Example is for illustration only.
B. The 6.500 m has been used here as an example new bottom reference. Enter the value that is required for your level measurement.

28 Section 4: Getting started

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IP2030/RM, Rev AA June 2014

4.2.2 Switching on with one 4–20 mA transmitter connected

After applying power with a 4–20 mA transmitter connected, the Full PV Display appears and
indicates a control unit Primary / Process Value (PV) of zero. It is then necessary to configure the
control unit for a 4–20 mA input instead of a digital HART input.

See “Optional change: transmitter input channel settings (advanced users)” on page 43 for this
procedure.

4.3 Switching on the MCU902 for the first time

The Mobrey MCU902 takes the input from two HART transmitters and calculates a single sum,
difference, or product of the two inputs.

It is important to connect the two HART transmitters in the correct sequence, as detailed in
“Connecting HART transmitters to the Mobrey MCU902” on page 18.

After both HART transmitters are connected, the top-left corner shows communications with
both transmitters by alternating “1” and “2” next to the digital communications icon.

The factory default configuration shows the reading from the first connected transmitter (Tx1).
This configuration can be changed to show the sum, difference or product of the readings from
both transmitters.

Figure 4-4. The MCU902 and two HART transmitters

B
C C

D E

A. Mobrey MCU900 Series Control Unit D. Transmitter [1] Bottom Reference

B. Mobrey MSP Series Transmitter E. Transmitter [2] Bottom Reference
C. HART Communications

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4.4 A quick tour of the menu system

Follow these instructions for a quick tour of the menu system:

1. This quick tour begins at the Full Display or Large PV Display (Figure 4-5 on page 31).
If already within the menu system, use the Esc button repeatedly until the Full Display
re-appears.

2. Press the red (ENTER) button to display the MAIN MENU (see Figure 4-5 on page 31).
The MAIN MENU is the top level of the menu system.

3. Navigation of the menu system is achieved by using the ARROW buttons,

the red (ENTER) button, and the Esc button.
The Esc button returns you to the previous menu level, unless you are at the top level.

4. The highlighted and blinking text indicates what menu option will be selected if the
red (ENTER) button was pressed now. Do not press it yet.

5. The symbol on the display indicates there are further menu options available,
accessible by using the DOWN-ARROW button.
An  symbol indicates there are further menu options available, accessible by using the
UP-ARROW button.

6. The MAIN MENU sits above a series of sub-menus, which lead to further levels of
sub-menus that lead to parameter screens (see Figure 4-6 on page 31).

7. Press the red (ENTER) button to select the highlighted menu option SETUP.

8. The SELECT INSTRUMENT menu now appears. This screen is for selecting whether to
enter the setup menu for the control unit (controller) or a found HART transmitter.
If there are no HART transmitters connected, Step 7 results in the SETUP menu for the control
unit appearing straight away. Skip to Step 10.

9. Press the red (ENTER) button to select the highlighted menu option Controller: ****.

10. The control unit SETUP menu now appears with menu options APPLICATION, DISPLAY,
and OUTPUT visible.

11. Use the DOWN-ARROW button to highlight OUTPUT and then press the red (ENTER)
button to select and enter the OUTPUT menu.

12. The OUTPUT menu now appears with menu options CURRENT OUTPUT, RELAY,
TOTALIZER, PV DAMPING, ALARM, and FAULT.

13. Explore these menu options to see screens for setting-up for an application and for
displaying read-only information.

14. After exploring, hold down the Esc button once to return to the MAIN MENU.

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Figure 4-5. How to enter the menu system

A 1.572m
1 12:47
B 1.572m
1 MAIN MENU
SETUP
Run App?
MONITOR

A. Large PV display.
B. Full display showing PV in normal size characters and other information.

Figure 4-6. MAIN MENU overview

= 1 Run App?

= Yes
Esc=No

or Note B

1 Program? 1 SELECT INSTRUMENT

Controller : ****
= Yes Tx1: ****
Esc=No Tx2: ****

Note A Note C
1 MAIN MENU
SETUP
Run App?
MONITOR

1 MAIN MENU
Run App?
MONITOR
Advanced

Note F Note D
1 ADVANCED 1 SELECT INSTRUMENT
Pxxx Controller : ****
Dxxx Tx1: ****
Tx2: ****
Note E

A. Toggles the operating mode of the control unit. An open padlock indicates that Program mode is selected and
parameter values can be changed.
B. Selecting Controller: ****leads to the SETUP menu for setting up the control unit for an application.
C. Selecting Tx1: **** leads to the SETUP menu for adjusting the HART transmitter Tx1 operation (and similarly for Tx2
on the Mobrey MCU902). The Transmitter Bottom Reference for Tx1 (and similarly for Tx2) can be changed here.
D. Selecting Controller: **** leads to menus for viewing live readings and diagnostic information for the control unit.
E. Selecting Tx1: **** leads to menus for viewing live readings and diagnostic information from the HART transmitter
Tx1 (and similarly for Tx2 on the Mobrey MCU902).
F. Advanced access menu for advanced users to directly select parameter screens when the parameter number is
known. For a guide to this, see Appendix D Additional Features.

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4.5 Programming the control unit

4.5.1 The basics
This chapter covers programming using the front panel of the MCU900 Series control unit to
make changes to the factory default set-up of the control unit.

Use the Application Wizard (App Wizard) to easily set-up the control unit for a level, flow, or
contents volume application, and then optionally adjust the set-up by editing parameters in the
menu system. See Appendix C: Menus and Parameters for a full list of menus and parameters.

Note
 If a Mobrey MSP Series transmitter is connected, refer to the reference manual of the
transmitter for full information about programming the transmitter parameters
(e.g. Transmitter Bottom Reference) using the MCU900 Series control unit or other
HART-based devices.
 For information about how the control unit supports other HART transmitters, see
Appendix C: Menus and Parameters and Appendix E: Support for HART® Transmitters.

The basics about parameters

The MCU900 Series control unit has menu-based parameters for programming – setting up for
an application, adjusting default settings, etc. – and for viewing information.

Parameters are populated throughout the menu system. They are grouped in sub-menus, which
are organized for intuitive programming. Each parameter has a unique 3-digit identification
number, prefixed by a 'P' (if programmable) or a 'D' (if for display purposes only).

Note
 A full list of menus and parameters is in Appendix C: Menus and Parameters

With some experience, it becomes easy to locate parameters. Alternatively, parameters can be
accessed directly by entering their unique 3-digit identification number. Details of this
Advanced access feature are in Appendix D: Additional Features.

To understand the basics about editing a parameter setting, follow the worked examples for
editing a numerical parameter and the calendar date parameter.

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How to edit a numerical parameter

1. Navigate to the Up Range Value parameter screen (see Figure 4-7).

2. When entering any parameter screen, it is in View Mode (Figure 4-8 on page 34).
Help with what can be done next is on display line 4.
(In View Mode, the Esc button is used to leave (quit) the parameter screen.
The SETTINGS menu then re-appears, as seen before selecting the parameter screen).

3. To enter Edit Mode, press the red (ENTER).

4. A highlighted “+” appears (Figure 4-8) to show this positive sign can be changed to be a
negative sign. The UP-ARROW or DOWN-ARROW cycles between “+” and “–”.
(Also, note that on display line 4, “Edit” has changed to be “Save”).

5. Change the number from “+12.000” to “+6.500” (Figure 4-8):

a. Press the RIGHT-ARROW button once to move right one space and highlight the “1”.
(The LEFT-ARROW can be used to move the highlight back one space).

b. Press the UP-ARROW button five times to change the “1” to a “6”.
(The DOWN-ARROW can be used to scroll down through the numbers and decimal point).

c. Press the RIGHT-ARROW button once to highlight the “2”.

d. Press the DOWN-ARROW button three times to change the “2” to a decimal point.
e. Press the RIGHT-ARROW button once to highlight the old decimal point.
f. Press the DOWN-ARROW button six times to change the old decimal point to a “5”.
(Note that other button press sequences could have been used to edit 6.500).

6. Press the red (ENTER) button to save the +6.500 and return to View Mode.
(Note that on display line 4, “Save” has changed back to “Edit”).

7. Press the Esc button to return to the SETTINGS menu.

Figure 4-7. Navigation to a numerical parameter screen

x3
SETUP
Note A APPLICATION
DISPLAY
OUTPUT OUTPUT
CURRENT OUTPUT x2
RELAY
TOTALIZER CURRENT OUTPUT
Low Range Val
Up Range Val
Alarm Action
Up Range Val P401
12.000 m
Esc=Quit =Edit

A. This is the SETUP menu for the control unit – see Figure 4-6 on page 31 for how to get here.

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Figure 4-8. Example of editing a numerical value

Note A Up Range Val P401

12.000 m
Esc=Quit =Edit

Note B Up Range Val P401

+ 12.000 m
Esc=Quit =Save

Up Range Val P401

Note C +12.000
1 m
Esc=Quit =Save

Up Range Val P401

+62.000
6 m
Esc=Quit =Save

Up Range Val P401

+6..000
. m
Esc=Quit =Save

Up Range Val P401

+6.5000
5 m
Esc=Quit =Save

Up Range Val P401

Note D
6.5000 m
Esc=Quit =Edit

A. When entering any parameter screen, it is in View Mode. Help with what can be done next is on display line 4.
B. Parameter is in Edit Mode. In this mode, pressing Esc button restores the original setting and returns to View Mode.
C. The UP-ARROW button is used to scroll up through the numbers and decimal point, and the DOWN-ARROW button
scrolls down through the numbers and decimal point.
D. Parameter has returned to View Mode.

How to edit the calendar date parameter

1. Navigate to the Date parameter screen (see Figure 4-9 on page 35).

2. When entering any parameter screen, it is in View Mode (Figure 4-10 on page 35).
Help with what can be done next is on display line 4.
(In View Mode, the Esc button is used to leave (quit) the parameter screen.
The SETTINGS menu then re-appears, as seen before selecting the parameter screen).

3. To enter Edit Mode, press the red (ENTER) button.

4. The “3” is highlighted to show this digit can now be edited (Figure 4-10).
(Also, note that on display line 4, “Edit” has changed to be “Save”).

5. Change the calendar date from “30/01/14” to “31/01/14”:

a. Press the RIGHT-ARROW button once to move right one space and highlight the “0”.
(The LEFT-ARROW can be used to move the highlight back one space).
34 Section 4: Getting started
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b. Press the UP-ARROW button once to change the “0” to a “1”.

(The DOWN-ARROW can be used to cycle backwards through the digits and decimal point).

6. Press the red (ENTER) button to save the new date and return to View Mode.
(Note that on display line 4, “Save” has changed back to “Edit”).

7. Press the Esc button to return to the SETTINGS menu.

Figure 4-9. Navigation to the calendar date screen

x5
SETUP
INPUT CHANNEL
Note A DIGITAL INPUT
SYSTEM SYSTEM
TEST
SETTINGS
DEFAULTS SETTINGS
Date
Time
Date Format
Date P730
30/01/14dmy
Esc=Quit =Edit

A. This is the SETUP menu for the control unit – see Figure 4-6 on page 31 for how to get here.

Figure 4-10. Example of editing the calendar date

Date P730
Note A 30/01/14dmy
Esc=Quit =Edit

Date P730
Note B 3
30/01/14dmy
Esc=Quit =Save

Note C Date P730

1
31/01/14dmy
Esc=Quit =Save

Date P730
Note D 31/01/14dmy
Esc=Quit =Edit

A. When entering any parameter screen, it is in View Mode. Help with what can be done next is on display line 4.
B. Parameter is in Edit Mode. In this mode, pressing Esc button restores the original setting and returns to View Mode.
C. The UP-ARROW button is used to scroll up through the numbers and decimal point, and the DOWN-ARROW button
scrolls down through the numbers and decimal point.
D. Parameter has returned to View Mode.

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The basics about the menu navigation

In this chapter and throughout this manual, a simple notation has been used to guide you to a
particular menu screen or parameter screen. This avoids the need for detailed navigation
instructions.

Consider the navigation instructions to be followed before arriving at the ADVANCED menu.
For the purpose of this example, the starting point is the Full PV Display.

In the notation form, this is simply:

1. Navigate to MAIN MENU / ADVANCED

Without the notation, this translates into these instructions:

1. Press the red (ENTER) button to display the MAIN MENU screen.

2. Press the DOWN-ARROW button three times until ADVANCED is highlighted and
blinking.

3. Press the red (ENTER) button once.

If square brackets are used in the notation, e.g. MAIN MENU / SETUP / [CONTROL UNIT], it
signifies that the bracketed menu does not appear in all circumstances.

When HART transmitters are not being used, the SELECT INSTRUMENT screen does not appear.
As there is no need to select the control unit menu or a HART transmitter (Tx1 or Tx2) menu, the
menus that appear after selecting MAIN MENU / SETUP are purely for the control unit.

Figure 4-11. Navigating to the ADVANCED menu

x3
MAIN MENU
Run App?
MONITOR
ADVANCED ADVANCED
Pxxx
Dxxx

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4.5.2 Step-by-step programming of the control unit

Step 1: Put the unit into Program mode
Put the control unit into Program mode. (The factory default is for it to be in Program mode).
See “Run App and Program operating modes” on page 38.

Step 2: Use the App Wizard

Use the Application Wizard (App Wizard) to easily set-up the control unit for a level, flow, or
contents volume application, and then optionally adjust the set-up by editing parameters in the
menu system. For examples of using the App Wizard, see“Application Wizard” on page 39.

Note:
 Before using the App Wizard with a 4–20 mA transmitter, the Input Channel 1 source
parameter P111 on the control unit must be set for a 4–20 mA input (see page 44)
 Level and volume measurement duties are not available on the MCU90F Logging unit.

Step 3: Optional changes after using the App Wizard

Optionally change system settings

This includes how to switch on the keyboard sound, setting the date/time, and changing
language. See “Optional change: system settings” on page 42.
Optionally change transmitter input channel settings (advanced users)

This is for advanced users and looks in-depth at how the input channels are used to obtain the
control unit Process Value / Primary Value (PV) value from a transmitter.

See “Optional change: transmitter input channel settings (advanced users)” on page 43

For most users, the App Wizard will set-up the majority of applications with no need of
direct changes to input channel parameters.
Optionally change application settings (advanced users)

This is for advanced users and looks in-depth at further processing of PV values to get content
(volume) or flow rate values, which can be shown on the display. A totalizer function can also be
set-up. For most users, the App Wizard will set-up the majority of applications with no
need of direct changes to application parameters.

See “Volumetric contents and flow measurement applications (advanced users)” on page 52
and “Using a plotted profile for calculating volume or flow” on page 61.

Optionally change the digital input settings

This includes how to allocate actions to digital inputs (IN1 and IN2).
See “Digital inputs IN1 and IN2” on page 63.
Optionally change output settings

This includes setting-up the 4–20mA output and relay outputs.

See “Set-up the current output” on page 68 and “Set-up the relays” on page 69.

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Optionally set-up other features

This includes configuring data logging (page 64), alarm handling (page 91), the display
(page 102), serial communications (page 104), and PIN security (page 105).

By default, security restrictions are switched off and the user has access to all parameters.
After programming (configuring) is complete, a PIN security code can be used to prevent
unauthorized access. For details, refer to Section “PIN Security” on page 105.

Step 4: Put the unit into Run App mode

Put the control into Run App mode (see below).

For checks e.g. auto-cycle of the control unit Primary / Process Value (PV), diagnostics, and
fault-finding, see Section 5: Servicing and Health Checking.

There is trouble-shooting information in Section 5: Servicing and Health Checking.

Alternatively, the MCU900 Series control unit can be re-set to the factory defaults as guided in
the Section “Restoring the factory defaults” on page 135.

4.5.3 Run App and Program operating modes

Menu: MAIN MENU / Run App? (or MAIN MENU / Program?)
There are two operating modes on the control unit: Run App and Program.

Press the red (ENTER) button at the Run App? or Program? screen to switch between these
two operating modes (Figure 4-12)

An open padlock icon indicates the MCU900 Series control unit is presently in the Program
mode.
In this mode, the unit can be programmed. The Current Output and all Relay Outputs are frozen
unless allocated to totalizing and sampler duties. Fault relays are de-energized.

A closed padlock icon indicates that the MCU900 Series control unit is presently in the Run App
mode. In this mode, most of the unit cannot be programmed. The Current Output and all Relay
Outputs operate as normal.

The Program? screen (Figure 4-12) appears automatically if an attempt is made to edit a
parameter whilst in Run App mode. A security PIN can be set-up to restrict the mode change.

Figure 4-12. How to switch between Run App and Program modes
Switching to Run App mode: Switching to Program mode:

1 MAIN MENU 1 MAIN MENU

SETUP SETUP
Run App? Run App?
Program?
MONITOR MONITOR

= 1 Run App? 1 Program?

= Yes = Yes
Esc=No Esc=No

1 MAIN MENU 1 MAIN MENU

SETUP SETUP
Program? Program?
MONITOR MONITOR

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4.5.4 Application Wizard

Use the Application Wizard (App Wizard) to easily set-up the control unit for an application.

If a message appears saying that the units are not set, it is because the HART transmitter has not
been found by the control unit when power was applied. Change the operating mode from
Program to Run App mode and the control unit will attempt to re-connect to the transmitter.

Note
 When using a MCU902 control unit, it is necessary to select Difference, Sum, Product,
or Independent (and channel) before Level/Volume/Flow can be selected.
 Level and volume measurement duties are not available on the MCU90F Logging unit.

Using the App Wizard to set-up a level application

Figure 4-13. App Wizard example: pump control with a high alarm

App Wizard
Options:
* Level
APPLICATION DATA
Select Application * Volume
Level * Flow INPUTS:
Esc=Back =Next
Level measurement in feet from transmitter.
Set Current Output ? Transmitter Bottom Reference is 22 ft.
Esc (no)
Sump/lift station working level is 20 ft.
Set up Relays ? 2-pump operation required is duty assist with
(yes)
common off. Auto-sequencing after 4 starts.
Options Relay Wizard
* Relay(s) Select Function (Pump OUTPUTS:
* Pump Control Pump Control
control)
* Custom Level in feet.
Pump Control Relay 1 (Pump 1) on at 5 ft.; off at 1 ft.
Number of Pumps (2)
2 Relay 2 (Pump 2) on at 8 ft.; off at 1 ft.
Relay 3 (High Alarm) on at 12 ft.; off at 11 ft.
Options
Select Pump Control
* Assist com off
Duty
(Assist
* Assist split off
* Stby com off Assist com off com off)
* Stby split off
Enter On point x5 x5
(5) A
for Pump 1
0000005 ft

Enter On point x5 x8 Options Relay Wizard x2

for Pump 2 (5) * Pump Control Select Function (Relays)
0000008 ft * Custom Relay(s)
* Relay(s)
Lowest common x5 Relay(s)
off point (1) Select Relay (Relay 3)
0000001 ft Relay 3

Pump Control
Select (yes) Options
Select Mode for (Hi or Lo
* Set point Relay 3 Alarm)
Autosequence Mode ? Hi or Lo Alarm
* Hi or Lo Alarm
Options * Rate of change
* Number of starts
Select
(Number * Out of limits Enter On point x4 x2
* Run-Time
Autosequence on * Digital input
(12)
* Ratio of Run-Time Number oft starts of starts) for Relay 3
* Ratio of starts
2 ft
000012
Number of starts x4 x4
Enter Off point
Qualifier (4) for Relay 3 (11)
00
4 1 ft
000011

Setup Complete Setup Complete

Program further (yes) Program further Esc (no)
Relays? Relays?

A Exits to menu system.

(Select Run App mode to start application).

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Using the App Wizard to set-up a contents volume application

Figure 4-14. App Wizard example: tank volume with a high alarm
Options: APPLICATION DATA
App Wizard * Level
Select Application * Volume
Volume * Flow INPUTS:
Esc=Back =Next Level measurement in feet from transmitter.
Transmitter Bottom Reference is 7.5 ft.
Options Volume Wizard
* Vertical cylinder
Select Tank Shape (Horiz
* Horiz Cyl flat
Horiz cyl flat cyl flat) Tank is a horizontal cylinder with flat ends.
* Horiz Cyl domed
* Rectangular Tank dimensions are 6.5 ft. dia. x 25 ft. length.
* Spherical (Wait while transferring plot points)
* Conical bottom Volume capacity is 6205.6 gallons.
* 20 point table
Choose method of
(Tank
Options calibrating Tank
* Tank dimensions Tank dimensions dimensions) OUTPUTS:
* Maximum volume Contents volume in US gallons displayed.
Enter value x6 x5
Relay on at 6000 gallons; off at 5800 gallons.
of Tank diameter
5
6.5000 ft (6.5) Current Output range 0 to 6200 gallons.
Enter value x2 x5
of Tank Length (25.0)
.
255000 ft

Volume Wizard
max Tank Volume (continue)
6205.6 gal

Set Current Output ? (yes)

Enter volume
to give 4 mA out (0)
0
000000 gal

Enter volume x3 x5 x2 x6
to give 20 mA out (Edits 6205.6 to be 6200.0)
0 gal
6200.0

Set up Relays ? (yes)

Options Relay Wizard

* Relay(s) Select Function (Relays)
* Pump Control
* Custom
Relay(s)

Options Relay(s)
* Relay 1 Select Relay (Relay 1)
* Relay 2 Relay 1
* Relay 3
* Relay 4
Select Mode for
Options Relay 1 (Hi or Lo Alarm)
* Set point Hi or Lo Alarm
* Hi or Lo Alarm
* Rate of change
* Out of limits
Enter On point x2 x6
* Digital input for Relay 1 (6000)
6
006000 gal

Enter Off point x2 x5 x8

for Relay 1 (5800)
8
005800 gal

Setup Complete
Program further Esc (no)
Relays?

Exits to menu system.

(Select Run App mode
to start application).

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Using the App Wizard to set-up a flow application

Figure 4-15. App Wizard example: open channel flow with a 60° V-Notch Weir
Options:
App Wizard * Level
Select Application * Volume
Flow * Flow
Esc=Back =Next x2

Options Flow Wizard x2

* gallons per day Select Output Units (gallons per min)
* gallons per hour gallons per min
* gallons per min
* Mega gals / day x2
* Cubic ft per hour
Flow Wizard
* Cubic ft per sec Select Profile (V-Notch Weir 5/2)
V-Notch Weir (5/2)
Options
* Flow Calculation (Wait while transferring plot points)
* Flume/Weir (3/2)
* V-Notch Weir (5/2) Enter max x5 x4 x5 x2 x5
* V-Notch (ISO1438) flow
(Edits 100.0 to be 645.5)
* Parshall 5 g/m
645.50
* Vlarem
* Manning
Choose method of
* 20 point look-up
calibrating flow (Height for max flow)
Options HT for max flow
* Height for max flow
* Flow at present height
Enter height for x5
max flow (1)
0000011 ft APPLICATION DATA
Do you wish INPUTS:
to set up a (yes) Level measurement in feet from transmitter.
low flow cut off ?
Open channel is a 60° V-Notch Weir
Enter x5 x2 Maximum flow is 645.50 gallons per minute.
low flow cut off (2)
0000012 % Height at maximum flow is 1 ft.

Enter flow
to give 4 mA out (0) OUTPUTS:
0
000000 g/m Flow rate in gallons per minute
Enter flow Totalized flow in gallons x 100
to give 20 mA out (645.50) 2% low flow cut-off
6
645.50 g/m

Flow Wizard
complete
(continue)

Set up totalizer?
(yes)

Options Totalizer Wizard x2

* gallons Select Units (gallons)
* gallons x10 gallons x100
* gallons x100
* gallons x1000
* million gallons
Display totalizer?
(yes)
* cubic feet

Set up Totalizer
relay?
Esc (no)

Set up Sampler
relay?
Esc (no)

Inhibit Totalizer
on digital input(s)?
Esc (no)

Totalizer Wizard
complete (continue)

Exits to menu system.

(Select Run App mode
to start application).

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4.5.5 Optional change: system settings

Menu: SETUP / [CONTROLLER /] SYSTEM / SETTINGS
Calendar clock

P730 Date

Set the calendar date in the format as selected by P734.

P731 Time

Set the clock time. The 24-hour clock format is supported.

P734 Date format (Default setting is "dd/mm/yy")

Choose between “dd/mm/yy”, “yy/mm/dd”, and “mm/dd/yy”.

Keypad sound

P735 Keypad Sound (Default setting is “Off”)

If you want the keypad sound switched on, select “On” from the option list.
Language

P737 Language (Default setting is "English")

If you wish to change the language used on-screen, there is a choice of other languages.

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4.5.6 Optional change: transmitter input channel settings

(advanced users)
Sections 4.5.6 to 4.5.9 are for advanced users. They explain in-depth what transmitter inputs
are supported on the control unit, and how to program (configure) the operation of those
transmitter inputs to result in a control unit Primary / Process Value (PV).

The resulting control unit PV is indicated on the factory-default configured display.

For most users, the App Wizard will set-up the majority of applications with no need of
direct changes to input channel parameters.

Transmitter input channels on the Mobrey MCU901 and MCU90F

The MCU901 and MCU90F control units support the connection of a single 4–20 mA or HART
transmitter. There is one transmitter input channel and it is referred to as Input Channel 1.

For a 4–20 mA transmitter:

 See “Programming Input Channel 1 for a 4–20 mA input (advanced users)” on page 44.

For a HART transmitter:

 See “Programming Channel 1 for a HART input (advanced users)” on page 48.

Transmitter input channels on the Mobrey MCU902

The MCU902 control unit supports the connection of two HART transmitters, but not two 4–20
mA transmitters. The input channels and are referred to as Input Channel 1 and Input Channel
2.

For two HART transmitters:

 See “Programming Channel 1 for a HART input (advanced users)” on page 48.
 See “Programming Channel 2 for a HART input (MCU902 only) (advanced users)” on
page 50.
Sum, difference, or product calculations using input channels 1 and 2

Parameter P150 selects how final values from transmitter input channels 1 (D851) and 2 (D852)
are processed together – sum, difference, or product calculation – before being output to
parameters D800, D801, D802, or D803 ('Answers').

The factory default programming (configuration) for P150 is to allow values from D851 to go
straight to D800.

For a graphical overview, see Figure 4-17 and Figure 4-18 on page 47.

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4.5.7 Programming Input Channel 1 for a 4–20 mA input

(advanced users)
This section explains how to program (configure) the operation of the Input Channel 1 on the
control unit when a 4–20 mA transmitter is connected. Do not connect a second transmitter.
Please read this section together with the graphical overview in Figure 4-16 on page 47.

The final result of the Input Channel 1 processing is stored in D800 and is referred to as the
control unit Primary / Process Value (PV). It is shown on the factory default configuration of
the display.

Essential parameters to program

Select the displayed units for the control unit Primary/ Process Value (PV)

First, it is essential to know the units for the measurements coming from the transmitter.
When this is known, navigate the menu system to SETUP / [CONTROLLER /] DISPLAY / PV Units
for the PV Units parameter P200 and then select the measurement units that are to be shown
for the control unit PV on the display.

Please note that the PV Units parameter (P200) does not automatically convert the transmitter
input or the control unit PV into alternative units. It is necessary to enter a conversion factor into
parameter P114 (see the descriptions that follow).
Set Input Channel 1 to receive input from a 4–20 mA transmitter

1. Navigate to the menu SETUP / [CONTROLLER /] INPUT CHANNEL / Ch1 I/P Source for
the Ch1 I/P Source parameter P111.

2. Select mA in 1 from the option list.

Note
 The built-in Application (App) Wizard is an easy-to-use configuration tool that can be
used to automatically populate values and settings in the input channel parameters.
Navigate to: SETUP / [CONTROLLER /] APPLICATION / App Wizard

 Before using the App Wizard with a 4–20 mA transmitter, the Input Channel 1 source
parameter P111 on the control unit must be set for a 4–20 mA signal input; this is not
the factory default setting for P111.

Optional parameters and how the 4–20 mA signal is processed

Figure 4-16 on page 47 shows how the 4–20 mA input signal is processed through Input
Channel 1 and which parameters and processing stages affect the resulting control unit PV.
Signal conditioning and damping stages

Analog measurements (level, pressure, and temperature, etc.) are input to the control unit as a
4–20 mA signal, and pass through a conditioning stage (to remove spikes) and a damping stage
(to smooth out large jumps in signals).

The damping can be adjusted by changing the time setting (in seconds) in parameter P321.
Navigate to the menu SETUP / [CONTROLLER /] INPUT CHANNEL / Cur I/P Damping.

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Signal limits check

The signal is then checked to ensure it is within the range of 3.7 to 20.75 mA. Signals outside
this range cause an alarm condition, which may be externally signalled using a control unit relay
(see “Alarm indication selection” on page 91).
Conversion of signal into a percentage value

By default, the mA signal (readable via D840) is converted (normalized) into a percentage in the
range 0 to 100% (readable via D842), where 4 mA is 0% and 20 mA is 100%.

Note
 The control unit can process mA input values in the range 3.8 to 20.5 mA
 Read-only parameters D840 and D842 are in the menu MONITOR / DIAGNOSTICS

Applying the optional percentage offset adjustment

P112 is a positive, negative, or zero offset adjustment of the converted (normalized)

percentage. This optional offset feature can be used to accommodate a standing level in a tank.

Note
 The output from this adjustment is readable in D802 and is the Tertiary Value (TV) of
the control unit. D802 = D842 + P112
 P112 is in the menu SETUP / [CONTROLLER /] INPUT CHANNEL / Ch1 I/P Offset

Applying the scaling factor to get the required units

Changing the PV display units (P200) does not automatically convert the control unit PV to be in
alternative units. A user-entered value in P114 is used to convert (scale) the offset-adjusted
percentage value (D802) to a new value (D801) that is in the required measurement units.

If the mA input represents a liquid level, simply set P114 to the level represented by 20 mA.

Note
 D801 is the Secondary Value (SV) of the control unit. D801 = (D802/100) * P114
 P114 is not applied if the PV display units (P200) are already configured to be “%”
 P114 is in the menu SETUP / [CONTROLLER /] INPUT CHANNEL / Ch1 Pre Scale
 Read-only parameters D80* are in the menu MONITOR / READINGS

Optional calculation of contents (volumetric) or flow measurement

By selecting a vessel profile or calculation using P113, a level measurement in D801 can be used
to calculate a volume measurement or open channel flow rate that is then stored in D851.
The programming (configuring) required for this is in “Volumetric contents and flow
measurement applications (advanced users)” on page 52.
Applying an optional low volume or flow rate cut-off action

The channel 1 output result in D851 can be forced to zero when it falls below a positive
threshold, which is a percentage of the maximum flow. Enter the percentage in P117.
By default, the setting is “None” to switch off this optional check.

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This feature is particularly useful in an open channel flow application where a small standing or
remaining liquid level in the channel would cause continued totalizing of flow when no actual
flow exists. As a guide, set P117 to a positive value of 2% of maximum flow to overcome this
problem.

Note
 P117 is in the menu SETUP / [CONTROLLER /] INPUT CHANNEL / Ch1 Low Cut-off

Applying optional damping to the control unit PV

P210 allows the to smooth out large steps in calculated values (D851).

Note
 P210 is in the menu:
SETUP / [CONTROLLER /] OUTPUT / PV DAMPING / MCU PV DAMPING
 D851 is in the menu:
MONITOR / DIAGNOSTICS / CHANNELS / Ch1 Output

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Figure 4-16. Transmitter Input Channel 1 for a 4–20 mA input

P111 = “mA in”

P321 <3.7mA P111 P112 P114

mA mA mA Input % Apply % (TV) % Apply (SV)

Conditioning 4-20mA Limit Normalise % %
mA Input D840 D842 Source Input D802 Input D801
and damping Alarm Check mA to % Select Offset Scaling

>20.75mA

Channel Low (CH1 O/P)

Scaled PV (PV)
Profile Cut-off D851
Damping D800
Select Check
Profiles

P115 P116

P113 P117 P210

Non-Linear Profile Post Scale NLP
Note:
Optional damping of mA readings ten times a second: mA = [mA_before + ((mAnow - mA_before)/(1+10 * P321))]
Optional damping of control unit PV ten times a second: D800 = [D800before + ((D800now - D800before)/(1+10 * P210))]

Figure 4-17. Transmitter Input Channel 1 for a HART input

P115 P116
P111 = “Tx1 : PV”
Post
Non-Linear
P111 P112 P114 P113 Scale P117
Profile P210
Profiles

NLP

Txr D900 Input

PV, SV,
Apply Apply Low (CH1 O/P)
TV or FV (PV)
D901 Profile Scaled PV
HART Source Input Input Cut-off D851 D800
D902 Select Damping
Variables Select Offset Scale Check
D903 (SV)
SV, TV and FV SV D801
Output
TV Map (TV)
D802
Note:
(FV)
Optional damping of control unit PV ten times a second: FV
D803
D800 = [D800before + ((D800now - D800before)/(1+10 * P210))]

Figure 4-18. Transmitter Input Channel 2 for a HART input

P125 P126
P121 = “Tx2 : PV”
Post
Non-Linear
P121 P122 P124 P123 Scale
Profile P127 P150 P210
NLP
Profiles

Txr (Tx2) D900 Input

PV, SV,
Apply Apply Low (CH2 O/P)
TV or FV (PV)
D901 Profile Scaled PV
HART Source Input Input Cut-off D852 D800
D902 Select Damping
Variables Select Offset Scale Check
D903
(SV)
D851 D801
(CH1 O/P)

PV, SV,
P151 (TV)
D802
TV and FV
Note: Tx1
FV (FV)
D803
Optional damping of control unit PV ten times a second: Tx2 Select
PV, SV,
D800 = [D800before + ((D800now - D800before)/(1+10 * P210))] TV and FV

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4.5.8 Programming Channel 1 for a HART input (advanced users)

This section explains how to program (configure) the operation of the Input Channel 1 on the
control unit when a HART transmitter is connected. Read this section together with the
graphical overview in Figure 4-17 on page 47.

Note
 Parameters from the HART transmitter are available on the control unit from the SETUP
and MONITOR menus, selectable from the main menu.

Essential parameter to program

Set Input Channel 1 to receive HART digital data from a transmitter

1. Navigate to the Ch1 I/P Source parameter P111:

SETUP / [CONTROLLER /] INPUT CHANNEL / Ch1 I/P Source (on MCU901/3)
SETUP / [CONTROLLER /] PV CALCULATION / CHANNEL 1 / Ch1 I/P Source (on MCU902)

2. Select Tx1: PV from the option list.

Note
 The built-in Application (App) Wizard is an easy-to-use configuration tool that can be
used to automatically populate values and settings in the input channel parameters.
Navigate to: SETUP / [CONTROLLER /] APPLICATION / App Wizard

 Before using the App Wizard, the Input Channel 1 parameter P111 on the control unit
must be set for a HART input. This is the factory default setting for P111.

Optional parameters and how the HART data is processed

Figure 4-17 on page 47 shows how the HART data is processed through Input Channel 1 and
shows which parameters and processing stages affect the result from Input Channel 1.
HART digital data is continuously read from the transmitter

The HART transmitter digitally communicates pre-calculated values of four HART variables
Primary Variable (PV), Secondary Variable (SV), Tertiary Variable (TV), and Fourth Variable (FV)
to the MCU900 Series control unit.
Selection of a HART variable as source for further processing

Parameter P111 selects one of the four HART variables (PV, SV, TV, or FV) on the transmitter to
be the source for further processing to get a result from Input Channel 1. The un-selected HART
variables are mapped to control unit D80x parameters (see Figure 4-17 on page 47).

Note
 In Figure 4-17 on page 47, the selected source is the HART Primary Variable (PV).
Alternatively, Tx1: SV, Tx1: TV, or Tx1: FV can be selected.
 Read-only parameters D80* are in the menu MONITOR / READINGS

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Applying the optional offset adjustment to the selected source

Parameter P112 is a positive, negative, or zero offset for adjustment of the selected HART
variable. As an example, this feature may be used to handle a standing level in a tank.

Note
 P112 is in the menu:
SETUP / [CONTROLLER /] INPUT CHANNEL / Ch1 I/P Offset (on MCU901/3) or
SETUP / [CONTROLLER /] PV CALCULATION / CHANNEL 1 / Ch1 I/P Offset (on MCU902)

Applying the optional scaling and profiling to the selected source

If volumetric or flow values are in the selected HART variable, set parameter P113 to Scaled.
Use parameter P114 to convert (scale) the value into units that match the display units you may
have selected (P200, P201, P202 or P203, as applicable in SETUP / [CONTROLLER /] DISPLAY).

If level values are in the selected HART variable, parameter P113 can be set to Scaled if wanting
just level measurement, and then use parameter P114 as described above. By selecting profile
calculation using P113, a level value can be used to calculate a volumetric or open channel flow
rate. The programming (configuring) required for this can be found in “Volumetric contents and
flow measurement applications (advanced users)” on page 52.

Note
 P113 and P114 are in the sub-menus /Ch1 Profile and /Ch1 Pre scale at:
SETUP / [CONTROLLER /] INPUT CHANNEL (on MCU901/3) or
SETUP / [CONTROLLER /] PV CALCULATION / CHANNEL 1 (on MCU902)

Applying an optional low-cut-off action

The channel 1 output result in D851 can be forced to zero when it falls below a positive
threshold, which is a percentage of the maximum flow. Enter the percentage in P117.
By default, the setting is “None” to switch off this optional check.

This feature is particularly useful in an open channel flow application where a small standing or
remaining liquid level in the channel would cause continued totalizing of flow when no actual
flow exists. As a guide, set P117 to a positive value of 2% of maximum flow to overcome this
problem.

Note
 P117 is in this menu:
SETUP / [CONTROLLER /] INPUT CHANNEL / Ch1 Low Cut-off (on MCU901/3) or
SETUP / [CONTROLLER /] PV CALCULATION / CHANNEL 1 / Ch1 Low Cut-off (MCU902)

Applying optional damping to the control unit PV

P210 allows the user to apply damping to smooth out big steps in calculated values in D851.

Note
 P210 is in the menu:
SETUP / [CONTROLLER /] OUTPUT / PV DAMPING / MCU PV DAMPING
 D851 is in the menu: MONITOR / DIAGNOSTICS / CHANNELS / Ch1 Output

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4.5.9 Programming Channel 2 for a HART input (MCU902 only)

(advanced users)
This section explains how to program (configure) the operation of the Input Channel 2 on the
control unit when a HART transmitter is connected. Read this section together with the
graphical overview in Figure 4-18 on page 47.

Note
 Parameters from the HART transmitter are available on the control unit from the SETUP
and MONITOR menus, selectable from the main menu.

Essential parameter to program

Set Input Channel 2 to receive HART digital data from a transmitter

1. Navigate to:
SETUP / [CONTROLLER /] INPUT CHANNEL / [CHANNEL 2 /] Ch2 I/P Source
for the Ch2 I/P Source parameter P121.

2. Select Tx2: PV from the option list.

Note
 The built-in Application (App) Wizard is an easy-to-use configuration tool that can be
used to automatically populate values and settings in the input channel parameters.
Navigate to: SETUP / [CONTROLLER /] APPLICATION / App Wizard

 Before using the App Wizard, the Input Channel 2 parameter P121 on the control unit
must be set for a HART input. This is the factory default setting for P121.

Optional parameters and how the HART data is processed

Figure 4-18 on page 47 shows how the HART data is processed through Input Channel 2 and
shows which parameters and processing stages affect the result from Input Channel 2.
HART digital data is continuously read from the transmitter

The HART transmitter digitally communicates pre-calculated values of four HART variables
Primary Variable (PV), Secondary Variable (SV), Tertiary Variable (TV), and Fourth Variable (FV)
to the MCU900 Series control unit.
Selection of a HART variable as source for further processing

Parameter P121 selects one of the four HART variables (PV, SV, TV, or FV) on the transmitter to
be the source for further processing to get a result from Input Channel 2. The un-selected HART
variables are mapped to control unit D80x parameters.

Note
 In Figure 4-18 on page 47, the selected source is the HART Primary Variable (PV).
Alternatively, Tx2: SV, Tx2: TV, or Tx2: FV could have been selected.
 Read-only parameters D80* are in the menu MONITOR / READINGS

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Applying the optional offset adjustment to the selected source

P122 is a positive, negative, or zero offset for adjustment of the selected HART variable.
As an example, this feature may be used to accommodate a standing value of level in a tank.
P122 is in the menu SETUP / [CONTROLLER /] PV CALCULATION / CHANNEL 2 / Ch2 I/P Offset.
Applying the optional scaling and profiling to the selected source

If volumetric or flow values are in the selected HART variable, set parameter P123 to Scaled.
Use parameter P124 to convert (scale) the value into units that match the display units you may
have selected (P200, P201, P202, or P203, as applicable in SETUP / [CONTROLLER /] DISPLAY).

If level values are in the selected HART variable, parameter P123 can be set to Scaled if wanting
just level measurement, and then use parameter P124 as described in the paragraph above.
By selecting profile calculation using P123, a level value can be used to calculate a volumetric or
open channel flow rate. The programming (configuring) required for this can be found in
“Volumetric contents and flow measurement applications (advanced users)” on page 52.

Note
 P123 and P124 are in the sub-menus /Ch2 Profile and /Ch2 Pre scale at:
SETUP / [CONTROLLER /] PV CALCULATION / CHANNEL 2

Applying an optional low-cut-off action

The channel 2 output result in D852 can be forced to zero when it falls below a positive
threshold, which is a percentage of the maximum flow. Enter the percentage in P127.
By default, the setting is “None” to switch off this optional check.

This feature is particularly useful in an open channel flow application where a small standing or
remaining liquid level in the channel would cause continued totalizing of flow when no actual
flow exists. As a guide, set P127 to a positive value of 2% of maximum flow to overcome this
problem.

Note
 P127 is in this menu:
SETUP / [CONTROLLER /] PV CALCULATION / CHANNEL 2 / Ch2 Low Cut-off

Applying optional damping to the control unit PV

P210 allows the user to apply damping to smooth out big steps in calculated values in D852.

Note
 P210 is in the menu:
SETUP / [CONTROLLER /] OUTPUT / PV DAMPING / MCU PV DAMPING
 D852 is in the menu: MONITOR / DIAGNOSTICS / CHANNELS / Ch2 Output

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4.5.10 Volumetric contents and flow measurement applications

(advanced users)
Sections 4.5.11 to 4.5.17 are for advanced users. They explain in-depth how the can be set-up to
use level measurements to calculate:
 the volumetric contents of a linear (uniform) shaped, covered vessel
 the volumetric contents or a non-linear (non-uniform) shaped, covered vessel
 flow in non-linear (non-uniform) shaped open channels, which can then be totalized
 flow in pre-programmed open channel flumes, which can then be totalized

The control unit has a built-in library of popular vessel profiles for volume of contents
calculations and standard open channel profiles for flow calculations.

For other vessel and channel profiles, see “Set-up flow calculations for non-linear / non-uniform
open channel profiles (advanced users)” on page 56.

4.5.11 Set-up the volumetric contents calculations for a

popular linear / uniform vessel (advanced users)
The MCU900 Series control unit can use level measurements to calculate the volumetric
contents of a linear (uniform) shaped, closed vessel e.g. a vertical cylinder or rectangular vessel.

Essential parameters to program

Set-up volumetric contents calculations for a linear (uniform) vessel

Parameter P113 (or P123) must be set to Scaled, which establishes that the volume of the
vessel contents is linearly derived from the liquid level measured by a transmitter (D801).

Parameter P114 (or P124) must be set to:

 the maximum contents volume of the vessel (if 4–20 mA level transmitter is used) or
 the cross-sectional area of the vessel per unit of level measurement
(if a HART level transmitter is used)

Note
 For a 4–20 mA transmitter measuring level, the volume is calculated as:
D851 = D801 where D801 = (D802 / 100) * P114
 For a HART level transmitter measuring level for Input Channel 1, the volume is
calculated as: D851 = (P114 * Level measurement after offset P112 is applied)
 For a HART level transmitter measuring level for Input Channel 2, the volume is
calculated as: D852 = (P124 * Level measurement after offset P122 is applied)
 P113 and P114 are in sub-menus /Ch1 Profile and /Ch1 Pre scale at:
SETUP / [CONTROLLER /] INPUT CHANNEL (on MCU901/MCU90F) or
SETUP / [CONTROLLER /] PV CALCULATION / CHANNEL 1 (on MCU902)
 P123 and P124 are in sub-menus /Ch2 Profile and /Ch2 Pre scale at:
SETUP / [CONTROLLER /] PV CALCULATION / CHANNEL 2 (on MCU902)
 Read-only parameters D80* are in the menu MONITOR / READINGS

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4.5.12 Set-up the volumetric contents calculations for a popular

non-linear / non-uniform shaped vessel (advanced users)
The MCU900 Series control unit can use level measurements to calculate the volumetric
contents or a non-linear (non-uniform) shaped, closed vessel.

The control unit has a library of popular non-linear vessel shapes:

 Horizontal cylinder with flat ends
 Spherical vessel
 Horizontal cylinder with domed ends

Examples of popular applications are shown in Figure 4-19 on page 55.

Note
 For other vessel shapes, see “Set-up flow calculations for non-linear / non-uniform open
channel profiles (advanced users)” on page 56.

Essential parameters to program

Select a popular non-linear vessel shape

Use parameter P113 (or P123) to select a non-linear vessel shape from the option list.
The control unit then automatically populates P115 (or P125) with data from the built-in library.

The volumetric contents calculations for these non-linear profiles require an input value over the
range 0.0 to 1.0. Parameter P114 (or P124) is therefore used to convert (scale) the input signal
to a value within the range 0.0 to 1.0 for the volume calculation.

Note (MCU901/MCU90F)
 P113, P114, and P115 are in the menus SETUP / [CONTROLLER /] INPUT CHANNEL
/Ch1 Profile, /Ch1 Pre scale, and /Ch1 NLP Data respectively

Note (MCU902)
 P113, P114, and P115 are in these menus:
SETUP / [CONTROLLER /] PV CALCULATION / CHANNEL 1 / Ch1 Profile, /Ch1 Pre scale,
and /Ch1 NLP Data (respectively)
 P123, P124, and P125 are in these menus:
SETUP / [CONTROLLER /] PV CALCULATION / CHANNEL 2/ /Ch2 Profile, /Ch2 Pre scale,
and /Ch2 NLP Data (respectively)

Setting P114 when a 4–20 mA level transmitter is connected

The 4–20 mA level transmitter should ideally provide a mA signal that is already scaled for the
full vessel height. P114 (or P124) can then be kept set at the default value of 1.0.

If the mA signal is not scaled for the full vessel height, P114 (or P124) must be programmed
with a value to convert (scale) the mA signal to be in the range 0.0 to 1.0. For example, if the
maximum current is below 20 mA for a full vessel, say 18 mA, set P114 = 16 * (18 - 4) = 1.143

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Setting P114 (or P124) when a HART level transmitter is connected

The maximum level measurement from the HART transmitter must be equal to the height of the
liquid when the vessel is full.

The level measurement, after any input offset has been applied, must be re-scaled to the range
0.0 to 1.0 ready for input to the NLP calculation.

For example, if the level measurement range is 0.0 to 4.0, set P114 = (1.0 / 4.0) = 0.25
Setting P116 (or P126) to the maximum volume of the vessel

Parameter P116 (or P126) must be programmed with the volume of the contents in a full vessel
in the units chosen (P200, P201, P202, or P203, as applicable to the transmitter input channel).

The level measurement value, which is now in the range 0.0 to 1.0, is multiplied by the P116
(or P126) value to get the volume of the contents. The resulting volume is then passed to the
optional low volume cut-off action. See pages 45, 49, or 51, as applicable.

Note (MCU901/MCU90F)
 P116 is in the menu SETUP / [CONTROLLER /] INPUT CHANNEL / Ch1 Post Scale
 P20x parameters are in the menu SETUP / [CONTROLLER /] DISPLAY

Note (MCU902)
 P116 is in this menu:
SETUP / [CONTROLLER /] PV CALCULATION / CHANNEL 1/ Ch1 Post Scale
 P126 is in this menu:
SETUP / [CONTROLLER /] PV CALCULATION / CHANNEL 2/ Ch2 Post Scale
 P20x parameters are in the menu SETUP / [CONTROLLER /] DISPLAY

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Figure 4-19. Examples of popular non-linear (non-uniform) vessel applications

P113/P123 = Horiz Cyl Flat

(Horizontal Cylinder, Flat Ends, Slope Ignored)

P114/P124 = (1.0 / Diameter of tank)

P115/P125 = Plotted non-linear profile of tank
P116/P126 = Full volume of ideal cylindrical tank

P113/P123 = Spherical

P114/P124 = (1.0 / Diameter of tank)

P115/P125 = Plotted non-linear profile of tank
P116/P126 = Full volume of ideal spherical tank

P113/P123 = Conical

P114/P124 = (1.0 / Maximum level)

P115/P125 = Plotted non-linear profile of tank
P116/P126 = Full volume of ideal conical tank

Note
 The non-linear profile (NLP) is plotted automatically when editing P113 / P123
manually or when using the Application (App) Wizard, except for the Conical NLP.
Menu: SETUP / [CONTROLLER /] APPLICATION / App Wizard
 P115 / P125 is plotted with a simple cone if P113 / P123 is set to Conical manually.

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4.5.13 Set-up flow calculations for non-linear / non-uniform

open channel profiles (advanced users)
The MCU900 Series control unit can use level measurements to calculate flow in open channels,
which can then be totalized. The control unit has a library of popular non-linear profiles for flow:
 Flume 3/2
 V-Notch 5/2
 Manning formula

Figure 4-20 on page 57 shows a typical open channel flow structure.

Essential parameters to program

Note
 P200 (PV units) must be changed from % to the required units of measurement.
The parameter P200 is in the menu SETUP / [CONTROLLER /] DISPLAY

Select a standard non-linear open channel profile

Use P113 (or P123) to select V Notch (5/2), Flume (3/2) or Manning from the option list.
The control unit then automatically populates P115 (or P125) with data from the built-in library.

The flow calculations for these non-linear profiles require an input value over the range 0.0 to
1.0. Parameter P114 (or P124) is therefore used to convert (scale) the input signal to be a value
within the range 0.0 to 1.0 for the flow calculation.

Note (MCU901/MCU90F)
 P113, P114, and P115 are in the menus SETUP / [CONTROLLER /] INPUT CHANNEL
/Ch1 Profile, /Ch1 Pre scale, and /Ch1 NLP Data respectively

Note (MCU902)
 P113, P114, and P115 are in these menus:
SETUP / [CONTROLLER /] PV CALCULATION / CHANNEL 1 / Ch1 Profile, /Ch1 Pre scale,
and /Ch1 NLP Data (respectively)
 P123, P124, and P125 are in these menus:
SETUP / [CONTROLLER /] PV CALCULATION / CHANNEL 2/ /Ch2 Profile, /Ch2 Pre scale,
and /Ch2 NLP Data (respectively)

Note
 When using the App Wizard, select V-Notch Weir (5/2), Flume/Weir (3/2), or
Manning at the prompt for a profile. This populates parameter P113 (or P123).

Setting P114 (or P124) when a 4–20 mA level transmitter is connected

The 4–20 mA level transmitter should ideally provide a mA signal that is already scaled for the
full level range expected in the flow channel. P114 (or P124) can then be kept set at the default
value of 1.0.

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If the mA signal is not scaled for the full level range of the channel, P114 (or P124) must be
programmed with a value to convert (scale) the mA signal to be a value in the range 0.0 to 1.0.
For example, if the maximum current is below 20 mA for a full channel, say 12 mA,
set P114 = 16 * (12 - 4) = 2.
Setting P114 (or P124) when a HART level transmitter is connected

The maximum level measurement from the HART transmitter must be equal to the height of the
liquid when the channel is full.

The level measurement, after any input offset has been applied, must be re-scaled to the range
0.0 to 1.0 ready for input to the NLP calculation.

For example, if the level measurement range is 0.0 to 1.5 m, set P114 = (1.0 / 1.5) = 0.667
Setting P116 (or P126) to the maximum flow expected in the channel

Finally, parameter P116 (or P126) must be programmed with the maximum flow expected in
the channel, which will occur at the maximum liquid level in the channel.

The control unit Primary/Process Value (D800) for the flow rate is derived by applying the
normalized transmitter input (range 0.0 to 1.0) to the profile, and then converting (scaling) by
parameters P114 and P116 (or P124 and P126).

Figure 4-20. Example of a non-linear open channel profile

P113 = “Flume (3/2)” (using 3/2 power law) (To BS3680)

P114 = (1.0 / Maximum height of flow in channel)

P115 = Plotted non-linear profile of channel
P116 = Maximum flow at maximum flow height

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4.5.14 Set-up open channel flow calculations for pre-programmed

flat, parabolic, and Parshall flumes (advanced users)
The MCU900 Series control unit has a library of data to set-up open channel flow calculations
with flat, parabolic, and Parshall flumes.

Essential parameters to program

Note
 Flow calculations require the transmitter input channel(s) to be providing continuous
level measurements (see page 43). Also, P200 (control unit PV units) must be changed
from the default % to the required flow measurement units.

Select a flume

Use parameter P113 (or P123) to select a flume from the option list. The control unit then
automatically populates parameter P115 (or P125) with data from the built-in library.

The control unit uses P115 (or P125) in a different way to when a plotted profile is required.
For flat and parabolic flumes, it is used to store values for the flow calculation in cubic metres per
hour (m3/hour) where flow Q is given by:

Q = k x (h x mul)Pwr

where h is the height of channel flow, and k and Pwr are factors.

When a flat or parabolic flume is selected, P115 / P125 (Pwr, k, and mul factors) and P116 /
P126 are populated for measuring flow in metric units of cubic metres per hour (m3/hour).

When a Parshall flume is selected, P115 / P125 (Pwr, k, and mul factors) and P116 / P126 are
populated for measuring flow in imperial units of US gallons per minute (GPM).

For flow measurement in alternative units, with automatic scaling of the control unit PV, use the
App Wizard (menu: SETUP / [CONTROLLER /] APPLICATION / App Wizard). The choice of units
offered depends on whether the transmitter is measuring in metric or imperial units.

Note
 This modified version of the standard “Q=k x hPwr”flow formula allows the use of a
multiplier (mul) factor. This extra factor can account for irregularities or errors in the
flow structure, but should only be manually entered where errors can be quantified.
 Pre-defined values for factors k, mul and Pwr of each standard flow structure in the
library are shown in Table 4-1 on page 60 and Table 4-2 on page 60. Depending on the
derivation of k and the level units, the h value is scaled by a different mul factor.
 Experienced users may wish to manually enter the values of k, mul or Pwr for specific
applications. To edit these, set P113/P123 to be “Flume***” and then edit k, mul or
Pwr at parameter P115/P125. Use the DOWN-ARROW button to display the mul value.
 When a flume is selected from this list, the MCU900 Series control unit also populates
parameters P400 and P401 (Current Output span), P530 (Totalizer factor), and
P531 (Totalizer units of m3 or galx100).

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Note (MCU901/MCU90F)
 P113, P115, and P116 are in the menus SETUP / [CONTROLLER /] INPUT CHANNEL
/Ch1 Profile, /Ch1 NLP Data, and /Ch1 Post Scale respectively

Note (MCU902)
 P113, P115, and P116 are in the menus SETUP / [CONTROLLER /] PV CALCULATION /
CHANNEL 1 / Ch1 Profile, /Ch1 NLP Data, and /Ch1 Post Scale respectively
 P123, P125, and P126 are in the menus SETUP / [CONTROLLER /] PV CALCULATION /
CHANNEL 2 /Ch2 Profile, /Ch2 NLP Data, and /Ch2 Post Scale respectively

Note
 When using the App Wizard, select Parshall or Vlarem at the prompt for a profile, and
the next prompt then allows selection of the pre-defined calculation e.g. Flume Flat 1

4.5.15 Set-up Kindsvater Shen (V-notch ISO1438) flow calculations

P113/P123 = “Kindsvater Shen”

This flow calculation requires just the angle of the V-notch to be entered in parameter P115
(or P125) to calculate a flow value over the weir. The head level measurement needs to be in
units of metres and the resultant flow value is in cubic metres per second (m3/s).

Note
 Flow calculations require the transmitter input channel(s) to be providing continuous
level measurements (see page 43). Also, P200 (control unit PV units) must be changed
from the default % to the required flow measurement units.
 When using the App Wizard, select V-Notch (ISO1438) at the prompt for a profile.
The App Wizard allows the selection of alternative flow units for the output result.

4.5.16 Set-up exponential flow law calculations

P113/P123 = “Flow calculation”

Exponential laws are supported by selecting this profile option, and manually entering values of
k-factor, power, and mul into parameters P115 (or P125).

The output is derived from the input value using: Q = k x (mul x Input)pwr

As an example, consider a an application with a rectangular weir and level measurements in ft.
When the flow rate (Q) is 2000 GPM, the gauged head (Input) is known to be 0.792 feet.
Terms mul is 1.000 and pwr is 1.5 for a rectangular weir.

Therefore, k is calculated as Q / (mul x Input)pwr) = 2000 / (1 * 0.792)1.5 = 2837.5

Note
 Flow calculations require the transmitter input channel(s) to be providing continuous
level measurements (see page 43). Also, P200 (control unit PV units) must be changed.

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Table 4-1. Pre-programmed flow calculation factors (Vlarem – flat and parabolic flumes)
Profile (P113/P123) k (P115 or P125) Pwr (P115 or P125) Mul (P115 or P125) P116 (or P126)
Flume Flat 1 0.1347877 1.5 0.01 3600.0
Flume Flat 2 0.1782664 1.5 0.01 3600.0
Flume Flat 3 0.3134177 1.5 0.01 3600.0
Flume Flat 4 0.5417157 1.5 0.01 3600.0
Flume Flat 5 0.8111058 1.5 0.01 3600.0
Flume Flat I 0.1322 1.5 0.01 3600.0
Flume Flat II 0.1777 1.5 0.01 3600.0
Flume Flat III 0.21758 1.5 0.01 3600.0
Flume Flat III bis 0.32835 1.5 0.01 3600.0
Flume Flat III ter 0.272 1.5 0.01 3600.0
Flume Flat IV 0.3521726 1.5 0.01 3600.0
Flume Flat V 0.442932 1.5 0.01 3600.0
Flume Flat V bis 0.4005 1.5 0.01 3600.0
Flume Flat VI 0.4990569 1.5 0.01 3600.0
Flume Flat VII 0.6237 1.5 0.01 3600.0
Flume Flat VIII 0.88116 1.5 0.01 3600.0
Flume Flt VIII bis 0.798 1.5 0.01 3600.0
Flume Flat IX 1.065186 1.5 0.01 3600.0
Flume Flat IX bis 0.8148 1.5 0.01 3600.0
Flume Flat X 1.3222761 1.5 0.01 3600.0
Flume Flat X bis 1.609 1.5 0.01 3600.0
Flume Flat X ter 1.064884 1.5 0.01 3600.0
Flume Flat XI 1.65099 1.5 0.01 3600.0
Flume Para 1 0.39885 2.3 0.01 3600.0
Flume Para 2 0.44187 2.3 0.01 3600.0
Flume Para 3 0.46362 2.2 0.01 3600.0
Flume Para 4 0.54419 2.2 0.01 3600.0
Flume Para 5 0.61851 2.1 0.01 3600.0
Flume Para 6 0.71726 2.1 0.01 3600.0
Flume Para 7 0.77152 2.1 0.01 3600.0
Flume*** (User) (User) (User) 3600.0

Note
 Vlarem flumes most commonly are used for open channel flow applications in Belgium.
When selecting a Vlarem flume from the above list, the PV flow units are automatically
set to m3/hr and the display configured to show the SV (level in cm on top line) and
totaliser in m3 (on bottom line). The transmitter base units must be set to metres

Table 4-2. Pre-programmed flow calculation factors (Parshall flumes)

Profile (P113/P123) Pwr (P115 or P125) k (P115 or P125) mul (P115 or P125) P116 (or P126)
Parshall 1 in 1.550 151.7 1.0 1.0
Parshall 2 in 1.550 303.4 1.0 1.0
Parshall 3 in 1.547 445.2 1.0 1.0
Parshall 6 in 1.580 924.5 1.0 1.0
Parshall 9 in 1.530 1378 1.0 1.0
Parshall 1 ft 1.522 1795 1.0 1.0
Parshall 1.5 ft 1.538 2693 1.0 1.0
Parshall 2 ft 1.550 3590 1.0 1.0
Parshall 3 ft 1.566 5386 1.0 1.0
Parshall 4 ft 1.578 7181 1.0 1.0
Parshall 5 ft 1.587 8976 1.0 1.0
Parshall 6 ft 1.595 10770 1.0 1.0
Parshall 8 ft 1.607 14360 1.0 1.0
Parshall 10 ft 1.600 17672 1.0 1.0
Parshall 12 ft 1.600 20982 1.0 1.0

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4.5.17 Using a plotted profile for calculating volume or flow

When parameter P113 (or P123) is set to “special”, the parameter P115 (or P125) is used for
defining a 20-point look-up table that represents the profile of a vessel or open flow channel that
is not in the control unit library.

Note
 When using the App Wizard, select 20 point look-up at the prompt for a profile.

Each point is a Cartesian co-ordinate (X, Y). The X value represents a level, and the Y value is the
corresponding volume or flow rate. The X points are at user-defined intervals, typically in equal
increments (5%) of maximum height.

These X points may be entered as levels (in the same units as the transmitter) and the Y points
entered as the corresponding volumes or flow rates for those levels (in the same units as selected
for the control unit Primary/Process Value). See Figure 4-21 on page 61, right-hand graph.

Parameters P114 (or P124) and P116 (or P126) need only be set to 1.0 for this method.
The volume or flow rate for the control unit PV is then derived from the plotted profile using the
live level measurements and interpolation between the plot points.

The X and Y points can also be converted (normalized) to be in the range 0.0 to 1.0 before being
entered manually (see Figure 4-21 on page 61, left-hand graph). A value is then derived from
the plotted profile using the live level measurements that are already converted (normalized) by
the Transmitter Input Channel processing. Parameter P116 (or P126) is then applied to the
derived value to obtain the volume or flow rate for the control unit PV.

Note (MCU901/MCU90F)
 P113 to P116 are in the menus SETUP / [CONTROLLER /] INPUT CHANNEL
/ Ch1 Profile, / Ch1 Pre scale, / Ch1 NLP Data, and / Ch1 Post Scale

Note (MCU902)
 P113 to P116 are in the menus SETUP / [CONTROLLER /] PV CALCULATION /
CHANNEL 1 / Ch1 Profile, / Ch1 Pre scale, / Ch1 NLP Data, and / Ch1 Post Scale
 P123 to P126 are in the menus SETUP / [CONTROLLER /] PV CALCULATION /
CHANNEL 2 / Ch2 Profile, / Ch1 Pre scale, / Ch2 NLP Data, and / Ch2 Post Scale

Figure 4-21. How to navigate to the P115 parameter screen

MAIN MENU
Note: The SELECT INSTRUMENT menu does not
SETUP appear unless a HART transmitter is connected.
Run App?
MONITOR SELECT INSTRUMENT
Controller: ****
Tx1 : **** #1 x3
SETUP
DISPLAY
OUTPUT x4
INPUT CHANNEL INPUT CHANNEL
Ch1 Profile
Ch1 Pre Scale
Ch1 NLP Data
Ch1 NLP Data P115
x0: 0.000
Note: The Mobrey MCU901 screens are shown here. y0: 0.000

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Figure 4-22. Examples of plotted profile for a spherical vessel

Y Y

1.0 2000.0

0.9 1800.0

0.8 1600.0

0.7 1400.0

0.6 1200.0

0.5 1000.0

0.4 800.0

0.3 600.0

0.2 400.0

0.1 200.0

X X
0.0 0.0
0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1.0 0.4 0.8 1.2 1.6 2.0 2.4 2.8 3.2 3.6 4.0

Normalized units (range 0.0 to 1.0) Actual level (X) and volume (Y) units

How to edit the 'look-up' table (P115/P125)

1. Parameter P113/P123 must first be set to be “Special”.

2. Navigate to the P115/P125 parameter screen (see Figure 4-21 on page 61).

3. Press the red (ENTER) button once to select point 0.

Before editing, you can use the DOWN-ARROW button to page down to another point
or use the Esc button to return to the menu.

4. With X0: highlighted, use the RIGHT-ARROW button to move across to the X0 value.

5. Use the UP-ARROW or DOWN-ARROW buttons to edit the X0 value.

6. Press the red (ENTER) button once to confirm the new X0 value.

7. With Y0: highlighted, use the RIGHT-ARROW button to move across to the Y0 value.

8. Use the UP-ARROW or DOWN-ARROW buttons to edit the Y0 value.

9. Press the red (ENTER) button once to confirm the new Y0 value.

10. To edit X0 and Y0 again, return to step 2. Otherwise, use the DOWN-ARROW button to
display the page with X1 and Y1 or use the Esc button to return to the menu.

11. Repeat for all points in the profile.

An X point with 0.0 terminates the profile (unless it is point X0, Y0).

Note
 The Esc button can be used during editing to abort and restore the original values; it
needs to be pressed again to move back to the 'X' or 'Y' text

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4.5.18 Digital inputs IN1 and IN2

Digital inputs IN1 and IN2 can be programmed to perform an action whenever they are
triggered.

Note
 See for “Digital control voltage-free contact inputs” on page 21 terminal connections.
 Digital input IN1 and IN2 statuses are shown on the left-hand side of the display:
o = inactive or = active.
 Parameter D835 shows the statuses of the inputs: active (1) or inactive (0).
First digit represents IN1. The second digit represents IN2.

How to allocate an action to IN1 or IN2:

1. Navigate to:
SETUP / [CONTROLLER /] DIGITAL INPUT / DIGITAL INPUT 1 or / DIGITAL INPUT 2

2. Use the Action selection parameter P340 (for IN1) or P345 (for IN2) to select a trigger
action from the option list. Table 4-3 lists all the options and explains their purpose.

3. Use the Delay parameter P341 (for IN1) or P346 (for IN2) if a delay is needed before an
action is performed. The setting format is m:s (minutes and seconds).

4. Use the On State parameter P342 (IN1) or P347 (IN2) to change the logic of the input
for triggering an action. Options are:
“Closed” (default) – an action is triggered when the voltage-free contact is closed, or
“Open” – an action is triggered when the voltage-free contact is open.

Table 4-3. Digital input actions

Action Action that occurs while digital input is triggered
Free Digital Input has no allocated action. This is the factory default setting.
Alarm (1) Forces an alarm condition, which is indicated if specified in the OUTPUT / ALARM menu.
Fault (2) Forces an fault condition, which is indicated if specified in the OUTPUT / FAULT menu.
Program mode Changes the control unit operating mode to Program (open padlock).
Hold totalizer Freezes the internal totalizer.
Hold MCU PV Prevents the control unit PV value (D800) from being updated.
Suppress Alarm If the digital input is active when an alarm condition is present, a message is displayed
indicating the alarm is being overridden. The Alarm relay is held on.
Display Msg (3) Displays a user-defined message (P241).
Log Input (4) When the next data logging interval elapses, flag the data logged as a 'bad sample' if the
digital input has been active.
Pump-down (5) Invoke a pump-down operation.
Lock Params Prevent 'P' prefixed parameters from being edited.
Protect totalizer 1 Prevent totalizer 1 from being reset.
Reset totalizer 2 (6) Reset totalizer 2.
(1) See“Set-up alarms” on page 91 for information about alarms and features they affect.
(2) See “Fault mode relay” on page 82 for how to indicate fault conditions using a relay output.
(3) SETUP / [CONTROLLER /] APPLICATION/ Message.
(4) Data logging is available on the Mobrey MCU90F.
(5) The pump-down feature available on the Mobrey MCU901 and Mobrey MCU902. See “Pump-down (Mobrey MCU901 and MCU902
only)” on page 85 for further information.
(6) Totalizer 2 is available on the Mobrey MCU902 and Mobrey MCU90F.

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4.5.19 Data logging on the Mobrey MCU90F

The Mobrey MCU90F can record (log) up to 7000 events at regular intervals.
 Each event is a parameter value. The parameter to be recorded (logged) is the one
selected for the middle section of the display (see Figure 2-4 on page 7).
This parameter-to-be-logged is typically the control unit Primary/Process Variable (PV).

 If the MCU90F has been set-up to totalize, the daily value of the totalizer at midnight is
also logged. Up to 60 midnight totalized values are held in memory. This is in addition
to the memory for 7000 events.
 The maximum value of the parameter-to-be-logged in each 24-hour period is also
logged.

The MCU90F gives a visual indication that logging of data is underway by flashing “LOG” in the
bottom, right-hand corner of the Full PV Display.

Note
 Logged data may be downloaded at any time using the RS232 data download socket,
supplied with a Mobrey MCU90F (see “RS232 connections” on page 22), and Mobrey
LOG-VIEW software running on a Windows PC.
 See “Serial communications” on page 104 for RS232 communication parameters.

Menu: SETUP / [CONTROLLER /] LOGGING

P590 Log Interval (Default is 15 minutes)

 The logging interval is the period over which the parameter-to-be-logged is sampled
every five seconds and then averaged at the end. The averaged value is then logged.
An interval value of 15 minutes logs the averaged value at 15-minute intervals, which
equates to 50 days elapsed time.

P591 Fast Log (Fast log mode) (Default is 0)

 If the parameter-to-be-logged value is higher than a user-entered value (P591),
the MCU90F automatically moves to a fast log mode.
The parameter-to-be-logged is then logged once every minute until the logged value is
less than P591. Fast logged values are tagged for easy identification when examining
logged data.

P593 Low Mem Alarm (Default is 0%)

 An alarm can be raised to indicate when the unused memory falls to below a
user-defined percentage (P593). See “Set-up alarms” on page 91 for selecting if this
alarm is indicated by a relay output, driving the output current to a set level, or both.
When the memory is full, logged data is either overwritten or the data logging stops, as
determined by parameter P592.

 Parameter D846 shows the percentage of free memory remaining for data logging.

P592 Data Overwrite (Default is “On”)

 After the logging memory is full, there is a choice to continue data logging and
overwrite the oldest data (On) or to stop data logging (Off).

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Starting, stopping and resetting the logger

To start data logging, change the logging interval (P590) from 0 to the interval required.
Logging is now activated.

Changing the logging interval from 0 to a logging interval in minutes will clear all data logged
(i.e. clear the 7000 event-memory plus the 60 midnight totals).

Changing the log interval from a non-zero interval (e.g. 15 minutes) to a new non-zero interval
(e.g. 5 minutes) will clear the 7000 event-memory).

To stop data logging, change the logging interval (P590) back to 0. Note, when the data logging
interval is re-set, all logged data will be cleared from the logging memory.

Figure 4-23. Navigating to the LOGGING Menu

Note: The SELECT INSTRUMENT menu does not
MAIN MENU appear unless a HART transmitter is connected.
SETUP
Run App?
MONITOR SELECT INSTRUMENT
Controller: ****
Tx1: ****
x3
SETUP
DISPLAY
OUTPUT
LOGGING LOGGING
Logging Wizard
Log Interval
Fast Log
Logging Wizard

ESC=Quit =Start

Figure 4-24. Menu map for LOGGING screens

Log Interval P590 Fast Log P591

0 min 0.0000 m
Esc=Quit =Edit Esc=Quit =Edit

LOGGING
Logging Wizard
Log Interval
Fast Log

LOGGING
Fast Log
Data Overwrite
Low Mem Alarm

Low Mem Alarm P593 Data Overwrite P592

0 % On
Esc=Quit =Edit Esc=Quit =Edit

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Using the Logging Wizard to set-up data logging of level

measurements
The Logging Wizard is the easiest way to set-up the data logging feature after the main
application is set-up.

As an example, consider data logging of the control unit PV value (D800) every 5 minutes; the
control unit PV is a level measurement in metres. When that level measurement is at one metre
or more, the Fast Log mode is required to activate. When the memory is full, old data is
overwritten.

1. Navigate to the Logging Wizard screen in the menu system (Figure 4-23 on page 65).

2. Start the Logging Wizard by pressing the red (ENTER) button once.
Change the operating mode to Program (Figure 4-12 on page 38), if prompted.

3. Work through the wizard prompts (Figure 4-25) until the menu system re-appears.
Key presses for the wizard example are provided alongside the prompts.

4. Change the operating mode to Run App (Figure 4-12 on page 38).

5. Press the Esc button repeatedly until the Full PV Display appears. In the bottom-right
of the display is now the word LOG, flashing to indicate that data logging is operating.

Figure 4-25. Logging wizard example with data logging of level measurements

Logging Wizard

ESC=Quit =Start

Set Interval
15 min
0
(Edits 15 to be 05)
Note A

Set fast LOG trip

(1)
1 m
000000

Options
* Yes
Overwrite old data (Yes)
* No Yes

Options LOG Digital input(s) (None)

* None None
*1
*2
* Both
Exit to the menu system

A. Measurement units for this wizard are dependent on control unit PV display units selected using parameter P200.

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Using the Logging Wizard to set-up of flow measurements

The Logging Wizard is the easiest way to set-up the data logging feature after the main
application is set-up.

As an example, consider data logging of the control unit PV value (D800) every 15 minutes;
the control unit PV is a flow measurement in cubic metres per second. When the flow
measurement is at 1 cubic metre per second or more, the Fast Log mode is required to activate.
When the memory is at 90% of capacity, a relay is activated instead of overwriting old data.

1. Navigate to the Logging Wizard screen in the menu system (Figure 4-23 on page 65).

2. Start the Logging Wizard by pressing the red (ENTER) button once.
Change the operating mode to Program (Figure 4-12 on page 38), if prompted.

3. Work through the wizard prompts (Figure 4-26) until the menu system re-appears.
Key presses for the wizard example are provided alongside the prompts.

4. Change the operating mode to Run App (Figure 4-12 on page 38).

5. Press the Esc button repeatedly until the Full PV Display appears. In the bottom-right
of the display is now the word LOG, flashing to indicate that data logging is operating.

Figure 4-26. Logging wizard example with data logging of flow measurements

Logging Wizard

ESC=Quit =Start

Set Interval
(15)
15 min
1
Note A

Set fast LOG trip

1 m3/s
000000
(1)

Options
* Yes Overwrite old data (No)
* No No

Options
Memory filling alarm (Relay)
* None
* Relay Relay
* Current
* Both
Select Relay (4)
Options 4
*1
*2 Memory Alarm Limit
*3 100 % (10)
*4

LOG Digital input(s) (None)

None

Exit to the menu system

A. Measurement units for this wizard are dependent on control unit PV display units selected using parameter P200.

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4.5.20 Set-up the current output

The Current Output is for transmitting the control unit PV value (D800) as a 4–20 mA signal.
The output is calculated by using the range values of parameters P400 and P401.

Example
Consider a control unit PV value of 5 metres and the PV range is 0 to 10 metres:
 0 metres is represented by a 4 mA signal (0%)
 5 metres is represented by a 12 mA signal (50%)
 10 metres is represented by 20 mA signal (100%)
Therefore, the Current Output would output the PV value 5 metres as a 12 mA signal.

Note
The current output is frozen while the control unit is in the Program operating mode.

Menu: SETUP / [CONTROLLER /] OUTPUT / CURRENT OUTPUT

P400 Low Range Val (Factory default is 0.0)
 This is the minimum control unit PV value represented by 4 mA.

P401 Up Range Val (Factory default is 100.0)

 This is the maximum control unit PV value represented by 20 mA.

P402 Alarm Actions (Factory default is 3.6 mA)

 Optional for determining how an alarm, if selected in the ALARM menu, is indicated on
the Current Output. Options for P402 are:
3.6 mA – fix current output to 3.6 mA to force a low current limit alarm.
Hold – freeze the current output at the present value.
21 mA – fix current output to 21 mA to force high current limit alarm.
See also Table 4-8 on page 94 for a summary of reporting methods for Alarms.

Note
 The 3.6 mA and 21 mA options are the Mobrey Standard.
 There is another alarm condition when the current output has reached the linear limit
i.e. saturated. For the Mobrey Standard, this is  3.8 mA or  20.5 mA.

P404 mA Mode (Factory default is “Instantaneous”)

 On the Mobrey MCU90F, this optional parameter is for assigning the Current Output to
follow a rolling average of the calculated control unit PV (typically flow). To do this,
select the Rolling option.
The time period for the rolling averaging is defined using P590, which is also for
defining the logging interval (see “Data logging on the Mobrey MCU90F” on page 64).

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P210 MCU PV Damping (Factory default is 0)

 This is used to apply damping to smooth out big steps in calculated control unit
Primary/Process values (PV).

4.5.21 Set-up the relays

An overview of the relay functions
Relays 1 to 4 are normally On Point / Off Point control relays which may be used to start/stop
pumps or open/close valves at different level points. The relay energizes at one level point and
then de-energizes at a different level point.

Relays can also be programmed as Out-of-limit Alarm relays which energize between defined
points and de-energize outside those points. The relays may also be programmed to perform
auto-sequences and auxiliary functions such as pump-down operations, pump rotations to
equalize wear, and de-sludge/cleaning. For further details, see “Other relay modes” on page 71.

Relay 5 is normally a Fail-safe Fault relay but may be re-allocated to another duty.

How to start and use the Relay Wizard

Relays can be programmed easily using the Relay Wizard, accessible by navigating to the
RELAY menu. The Relay Wizard also forms a part of the Application (App) Wizard.

Figure 4-27. Navigating to the RELAY Screen

Note: The SELECT INSTRUMENT menu does not

MAIN MENU appear unless a HART transmitter is connected.
SETUP
Run App?
MONITOR SELECT INSTRUMENT
Controller: ****
Tx1: **** #1 x2
SETUP
APPLICATION
DISPLAY
OUTPUT OUTPUT
CURRENT OUTPUT
RELAY
TOTALIZER 1 RELAY
Relay Wizard
Reset RL Params
RELAY 1
Note: The Mobrey MCU901 screens are shown here.

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Understanding the relay status icons on the display

The relay status icons on the Full PV Display have the following meanings:

= Relay is energized

0 = Relay is de-energized

A = Alarm relay (see page 91 about alarms)

S = Sampler relay

T = Totalizing relay

How to reset the relay parameters only to factory defaults

To reset all relay parameters to their factory defaults, do the following:

1. Navigate to: SETUP / [CONTROLLER /] OUTPUT / RELAY / Reset RL param

2. If you wish to proceed, press the red (ENTER) button once.

(Otherwise, use the Esc button to exit to the RELAY menu).

3. Wait until the “Please wait…” message disappears.

4. Press the Esc button to exit to the RELAY menu.

Note
 Setting the relays to their factory default state in this way does NOT reset any other
parameters to their default state.

How to set-up an on/off point control relay

Note
 Relays are frozen while the MCU900 Series control unit is in Program mode, preventing
all relay operations apart from Totalizer and Sampler relays.

Relay outputs 1 to 4 can be programmed to be an On/Off Point control relay.

Menus:
SETUP / [CONTROLLER /] OUTPUT / RELAY / RELAY 1, / RELAY 2, etc.

Relay 1 (RL1)
 When relay RL1 mode (P410) is Set Point:
relay RL1 is energized at P411 (on point) and de-energized at P412 (off point)

Relay 2 (RL2)
 When relay RL2 mode (P420) is Set Point:
relay RL2 is energized at P421 (on point) and de-energized at P422 (off point)

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Relay 3 (RL3)
 If relay RL3 mode (P430) is Set Point:
relay RL3 is energized at P431 (on point) and de-energized at P432 (off point)

Relay 4 (RL4)
 If relay RL4 mode (P440) is Set Point:
relay RL4 is energized at P441 (on point) and de-energized at P442 (off point)

In a basic emptying application, the On Point (e.g. P411) is programmed to be greater than the
Off Point (e.g. P412). The Set Point relay energizes when the control unit PV value (D800)
exceeds the On Point and de-energizes when the PV value drops below the Off Point.

In a basic filling application, the On Point (e.g. P411) is programmed to be less than the
Off point (e.g. P412). The Set Point relay energizes when the control unit PV value (D800)
falls below the On point and de-energizes when the PV value rises above the Off Point.

There are set point relays modes for the control unit SV value (D801), TV value (D802) and
FV value (D803). For details of these D80* parameters, see “Optional change: transmitter input
channel settings (advanced users)” on page 43.

Relay safeguard options

Menus:
SETUP / [CONTROLLER /] OUTPUT / RELAY / RELAY 1, / RELAY 2, etc.

P413 RL1 Min On (Factory default: 0:00 m:s)

Defines the minimum time (minutes and seconds) that relay RL1 will stay energized before
de-energising. This is an optional override (safeguard) to allow sufficient time for connected
equipment to respond.

P414 RL1 Max On Factory default: 0:00 m:s)

Defines the maximum time (minutes and seconds) that relay RL1 will stay energized before
de-energising. This is an optional override (safeguard) to prevent overuse of connected
equipment.

P415 RL1 Min Off (Factory default: 0:00 m:s)

Defines the minimum time (minutes and seconds) that relay RL1 will stay de-energized before
energising. This is an optional override (safeguard) to avoid overuse of connected equipment.

P423 to P425 are the equivalents for relay RL2.

P433 to P435 are the equivalents for relay RL3.

P443 to P445 are the equivalents for relay RL4.

P453 to P455 are the equivalents for relay RL5.

Other relay modes

Table 4-4 on page 72 is a list of all relay modes. Relay modes automatically enable and disable
special control functions, special alarms and pumped volume totalizing as shown in Table 4-5 on
page 73. Descriptions of relay modes and the auxiliary functions follow Table 4-5.

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Table 4-4. Relay modes

Auxiliary
functions
Relay Mode Purpose of Relay Mode (Table 4-5)
None Relay is not used No
Set point SV On/Off Point control using SV (D801) Yes
– see “How to set-up an on/off point control relay” on page 70.
Set point TV On/Off Point control using TV (D802) Yes
– see “How to set-up an on/off point control relay” on page 70.
Set point FV On/Off Point control using FV (D803) Yes
– see “How to set-up an on/off point control relay” on page 70.
Assist Duty Assist, On/Off Point Control and Auto Sequence Yes
– see “Duty Assist relay with common off points” on page 74.
– see “Duty Assist with split off points” on page 76.
– see “Auto-sequence (Mobrey MCU901 and MCU902 only)” on page 84.
Stby com off Duty Standby, Common Off and Auto Sequence Yes
– see “Standby, Common Off mode relay” on page 78
– see “Auto-sequence (Mobrey MCU901 and MCU902 only)” on page 84.
Stdby split off Duty Standby, Split Off and Auto Sequence Yes
– see “Standby, Split Off mode relay” on page 80.
– see “Auto-sequence (Mobrey MCU901 and MCU902 only)” on page 84.
Digital Input 1 Relay energizes while Digital Input 1 (IN1) is active. Yes
Digital Input 2 Relay energizes while Digital Input 2 (IN2) is active. Yes
Sampler Relay outputs sampler pulses No
– see “Sampler mode relay” on page 82.
RoC Relay is energized if the rate of change of the control unit PV is out-of-limits Yes
– see “Rate of Change mode relay” on page 83.
Digital input 1+2 Relay is energized while Digital Input 1 (IN1) and 2 (IN2) are both active Yes
Off Relay is always de-energized No
Set Point On/Off Point Control using PV (D800) Yes
– see “How to set-up an on/off point control relay” on page 70.
Alarm Relay is allocated to alarm indication duty Yes
– see “Set-up alarms” on page 91 for details of alarm handling.
Hi or Lo Alarm High alarm limit (using On/Off Point Control): Yes
– The On Point must be greater than the Off Point.
– Relay energizes when the PV (D800) is greater than the On Point.
– Relay de-energizes when the PV (D800) is less than the Off Point.
Low alarm limit (using On/Off Point Control):
– The On Point must be less than the Off Point.
– Relay energizes when the PV (D800) is less than the Off Point.
– Relay de-energizes when the PV (D800) is greater than the On Point.
An “A” is shown by the RL1 icon status (on the Full PV Display) when there is a
high or low alarm. (The section “Set-up alarms” on page 91 is not applicable).
Totalizer Relay outputs totalizer pulses (MCU901 only) No
– see “Totalizer mode relay” on page 82.
Totalizer 1 Relay outputs totalizer 1 pulses (MCU902/MCU90F only) No
– see “Totalizer mode relay” on page 82.
Totalizer 2 Relay outputs totalizer 2 pulses (MCU902/MCU90F only) No
– see “Totalizer mode relay” on page 82.
Fault Indicate fault condition by de-energizing relay No
– see “Fault mode relay” on page 82.
Custom To set-up a custom relay operation, see “Custom mode relay” on page 86. No
PV limits Relay energizes while control unit PV value (D800) is within on/off point limits. Yes
– see “PV Limits mode relay” on page 83.
On Relay is always energized No

72 Section 4: Getting started

 Table 4-5. Auxiliary functions valid for a given relay mode
SPECIAL CONTROL FUNCTIONS SPECIAL ALARMS
(1)
AUTO ENERGY SCUM LINE PUMP RELAY RELAY RUN NO RISING PUMP PUMPED
(1)
RELAY MODE SET POINTS SEQUENCE SAVING DOWN (1) CUSTOM OPS TIME ACTIVITY LEVEL EFFICIENCY VOLUME
None
IP2030/RM, Rev AA

Set point (PV) Yes Yes Yes Yes Yes Yes Yes Yes
Reference Manual

Set Point (SV) Yes Yes Yes Yes Yes Yes Yes Yes

Section 4: Getting started

Set Point (TV) Yes Yes Yes Yes Yes Yes Yes Yes
Set Point (FV) Yes Yes Yes Yes Yes Yes Yes Yes
Assist Yes Yes Yes Yes Yes Yes Yes Yes Yes Yes Yes
Stby Com-off Yes Yes Yes Yes Yes Yes Yes Yes Yes Yes Yes
Stby Split-off Yes Yes Yes Yes Yes Yes Yes Yes Yes Yes Yes
Digital Inputs Yes Yes Yes
Sampler
Rate change Yes Yes Yes Yes
Off
Alarm Yes
Hi / Lo Alarm Yes
Totalizer
Fault
Custom
PV Limits Yes Yes Yes Yes
On
page 70 page 84 page 85 page 85 page 85 page 86 page 88 page 88 page 88 page 89 page 89 page 90
(1) Option available on the Mobrey MCU901 and MCU902 only.

73
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Duty Assist relay with common off points

This function requires two or more Assist mode relays. Two or more of these relays can be
energized at the same time (assisting), and they all de-energize at a common off point.

An Assist relay uses its On Point and Off Point parameters in a similar way to a Set Point mode
relay. A typical application would be emptying a wet well / lift station.

The worked example here illustrates how the function works. To keep the example simple, the
auto-sequencing options are not considered.
Example wet well / lift station application (emptying operation due to rising level)
using assist mode relays and common off points

Consider an application with two relay outputs, RL1 and RL2, connected to individual pumps in a
wet well/lift station. The control unit PV value (D800) is a level measurement in metres (m).
 In Figure 4-28, both Pump 1 and Pump 2 are off because the liquid level is at a
satisfactory level, below 5 m
 When the level rises above 5 m (On point, P411), the relay RL1 is energized to start
Pump 1 (Figure 4-29)
 If the level continues to rise and is above 8 m (On point, P421), relay RL2 is energized to
start Pump 2 and assist Pump 1. Relay RL1 stays energized to keep Pump 1 pumping
(Figure 4-30)
 Pump 1 and Pump 2 continue to pump down until the level falls to below 2 m (Off Point,
P412 and P422), at which relays RL1 and RL2 de-energize to switch off both pumps
(Figure 4-31).
In this emptying application, the common off point is P412 (Off point, relay RL1) and
P422 (Off point, relay RL2), both of which are at the 2 m level.

Note
 If Pump 1 had kept the level below 8 m, it would stay switched on until the level is 2 m.
Safeguards to prevent over-use of a pump are in “Relay safeguard options” on page 71.

Figure 4-28. Both Pump 1 and Pump 2 are off (the level is okay)

Level in m

8.0 m (P421)

5.0 m (P411)

Pump 1 Pump 2 2.0 m (P412 and P422)

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Figure 4-29. Pump 1 is on (the rising level is above 5 m)

Level in m

8.0 m (P421)

5.0 m (P411)

Pump 1 Pump 2 2.0 m (P412)

Figure 4-30. Pump 1 and Pump 2 are on (the rising level is above 8 m)

Level in m

8.0 m (P421)

5.0 m (P411)

Pump 1 Pump 2 2.0 m (P412)

Figure 4-31. Pump 1 and Pump 2 are off (the falling level is below 2 m)

Level in m

8.0 m (P421)

5.0 m (P411)

Pump 1 Pump 2
2.0 m (P412)

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Duty Assist with split off points

This function requires two or more Assist mode relays. Two or more of these relays can be
energized at the same time (assisting), and they all de-energize at a split off points.

An Assist relay uses its On Point and Off Point parameters in a similar way to a Set Point mode
relay. A typical application would be emptying a wet well / lift station.

The worked example here illustrates how the function works. To keep the example simple, the
auto-sequencing options are not considered.
Example wet well / lift station application (emptying operation due to rising level)
using assist mode relays and split (separate) off points

Consider an application with two relays, RL1 and RL2, connected to individual pumps in a
wet well. The control unit PV value (D800) is a liquid level measurement in metres.
 In Figure 4-32, both Pump 1 and Pump 2 are off because the liquid level is at a
satisfactory level, below 5 m
 When the level exceeds 5 m (On Point, P411), relay RL1 is energized to start Pump 1
(Figure 4-33)
 When the level exceeds 8 m (On Point, P421), relay RL2 is energized to start Pump 2 and
assist Pump 1. Relay RL1 stays energized to keep Pump 1 pumping (Figure 4-34)
 When the level falls to below 3.5 m (Off point, P422), relay RL2 de-energizes to switch
off Pump 2 (Figure 4-35)
 When the level falls to below 2 m (Off point, P412), relay RL1 de-energizes to switch
off Pump 1

Note
 If Pump 1 keeps the level below 8 m, it would stay switched on until the level is 2 m.
Safeguards to prevent overuse of pumps are in “Relay safeguard options” on page 71

Figure 4-32. Both Pump 1 and Pump 2 are off (the level is okay)

Level in m

8.0 m (P421)

5.0 m (P411)
3.5 m (P422)
Pump 1 Pump 2 2.0 m (P412)

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Figure 4-33. Pump 1 is on (the rising level is above 5 m)

Level in m

8.0 m (P421)

5.0 m (P411)
3.5 m (P422)
Pump 1 Pump 2 2.0 m (P412)

Figure 4-34. Both Pump 1 and Pump 2 are on (the rising level is above 8 m)

Level in m

8.0 m (P421)

5.0 m (P411)
3.5 m (P422)
Pump 1 Pump 2 2.0 m (P412)

Figure 4-35. Pump 1 on and Pump 2 is off (the falling level is below 3.5 m)

Level in m

8.0 m (P421)

5.0 m (P411)
3.5 m (P422)
Pump 1 Pump 2 2.0 m (P412)

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Standby, Common Off mode relay

This function requires two or more Standby, Common Off mode relays. Only one of these
relays is energized at any one time and the others are on standby to take over when needed.

A Standby, Common Off relay uses its On Point and Off Point parameters in a similar way to a
Set Point mode relay. A typical application would be emptying a wet well / lift station.

The worked example here illustrates how the function works. To keep the example simple, the
auto-sequencing options are not considered.
Example wet well application (emptying operation due to rising level) using standby,
common off point relays

Consider an application with two relay outputs, RL1 and RL2, connected to individual pumps in a
wet well. The control unit PV value (D800) is a liquid level measurement in metres (m).
 In Figure 4-36, both Pump 1 and Pump 2 are off because the liquid level is at a
satisfactory level, below 5 m
 When the level rises above 5 m (On point, P411), the relay RL1 is energized to start
Pump 1 (Figure 4-37)
 If the level continues to rise and is above 8 m (On point, P421), the relay RL2 is
energized to start Pump 2. Relay RL1 is de-energized to switch off Pump 1 (Figure 4-38)
 Pump 2 continues to pump until the level falls below 2 m (Off Point, P412), at which
relay RL2 will de-energize to switch off Pump 2. (Pump 1 is already switched off).
In this emptying application, the common off point is P412 (Off point, relay RL1) and
P422 (Off point, relay RL2), both of which are at the 2 m level.

Note
 If Pump 1 had kept the level below 8 m, it would stay switched on until the level is 2 m.
Safeguards to prevent over-use of a pump are in “Relay safeguard options” on page 71.

Figure 4-36. Both Pump 1 and Pump 2 are off (the level is okay)

Level in m

8.0 m (P421)

5.0 m (P411)

Pump 1 Pump 2 2.0 m (P412 and P422)

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Figure 4-37. Pump 1 is on (the rising level is above 5 m)

Level in m

8.0 m (P421)

5.0 m (P411)

Pump 1 Pump 2 2.0 m (P412)

Figure 4-38. Pump 1 is off and Pump 2 is on (the rising level is above 8 m)

Level in m

8.0 m (P421)

5.0 m (P411)

Pump 1 Pump 2 2.0 m (P412)

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Standby, Split Off mode relay

This function requires two or more Standby, Split Off Point mode relays. Only one of these
relays is energized at any one time and the others are on standby to take over when needed.

A Standby, Split Off Point relay uses its On Point and Off Point parameters, just like a Set Point
mode relay. A typical application would be emptying a wet well / lift station.

The worked example here illustrates how the function works. To keep the example simple, the
auto-sequencing options are not considered.
Example wet well / lift station application (emptying operation due to rising level)
using standby, split off point relays

Consider an application with two relays, RL1 and RL2, connected to individual pumps in a
wet well. The control unit PV value (D800) is a liquid level measurement in metres.
 In Figure 4-39, both Pump 1 and Pump 2 are off because the liquid level is at a
satisfactory level, below 5 m
 When the level exceeds 5 m (On Point, P411), relay RL1 is energized to start Pump 1.
(Figure 4-40)
 When the level exceeds 8 m (On Point, P421), relay RL2 is energized to start Pump 2.
Relay RL1 is de-energized to switch off Pump 1 (Figure 4-41)
 When the level falls to below 5 m (Off point, P422), relay RL2 de-energizes to switch off
Pump 2. Relay RL1 is energized to switch on Pump 1 (Figure 4-42)
In this emptying application, the switch off point for Pump 2 is 5 m; the On Point for
relay 1 P411 (On point, relay RL1) is used. P422 (Off point, relay RL2) is ignored.

 When the level falls below 2 m (Off point, P412), relay RL1 de-energizes to switch off
Pump 1

Note
 If Pump 1 keeps the level below 8 m, it would stay switched on until the level is 2 m.
Safeguards to prevent overuse of pumps are in “Relay safeguard options” on page 71

Figure 4-39. Both Pump 1 and Pump 2 are off (the level is okay)

Level in m

8.0 m (P421)

5.0 m (P411)

Pump 1 Pump 2 2.0 m (P412)

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Figure 4-40. Pump 1 is on (the rising level is above 5 m)

Level in m

8.0 m (P421)

5.0 m (P411)

Pump 1 Pump 2 2.0 m (P412)

Figure 4-41. Pump 1 is off and Pump 2 is on (the rising level is above 8 m)

Level in m

8.0 m (P421)

5.0 m (P411)

Pump 1 Pump 2 2.0 m (P412)

Figure 4-42. Pump 1 is on and Pump 2 is off (the falling level is below 5 m)

Level in m

8.0 m (P421)

5.0 m (P411)

Pump 1 Pump 2 2.0 m (P412)

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Totalizer mode relay

Menu: SETUP / [CONTROLLER /] OUTPUT / TOTALIZER

A Totalizer relay can output a pulse for each time that the internal totalizer count (D828)
increments. The duration of the pulse may set using parameter P534.

P534 Pulse Width (Factory default is 100)

 The duration controls both the 'On' time and the 'Off' time - i.e. the pulse width - and
may be set to a value between 10 ms and 2.5 seconds in steps of 10ms.

Note
 If the totalizer count is running faster than the relay can produce pulses, an internal
accumulator stores the excess pulses. The stored excess pulses are output by the
Totalizer relay after the totalizer count rate reduces.

Sampler mode relay

Sampler relays output pulses at a slower rate than a Totalizer relay. The Sampler relay can be
used as a coarse totalizer or as a trigger to an external event.
Menu: SETUP / [CONTROLLER /] OUTPUT / TOTALIZER

P535 Sampler Factor (Factory default is 0)

 This is for defining the frequency of the Sampler pulse. For example, a value of 100
means that the Sampler relay outputs a single pulse for every 100th increment to the
Totalizer Count (D828/D829)
 The pulse width is the same as selected for the Totalizer relay (P534)

Note
 For information on setting up the totalizer, see page 95 onwards.

Fault mode relay

Fault relays de-energize when a particular fault condition exists. Parameter D831 shows a list of
active faults. Table 4-8 on page 94 has a summary of reporting methods for faults.
Menu: SETUP / [CONTROLLER /] OUTPUT / FAULT

P560 System Fault (Factory default is Both)

 Fault relay de-energizes while there is a control unit fault and the option is Both or Relay

P561 CU Temp Fault (Factory default setting is None)

 Fault relay de-energizes while the CPU temperature rises above 65C and the option is
Both or Relay. Read-only parameter D844 shows the live temperature reading

P562 Xmtr Fault (Factory default setting is None)

 Fault relay de-energizes while a HART transmitter signals a fault and the option is
Both or Relay

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P563 Digital Input (Factory default setting is None)

 Fault relay de-energizes while digital input IN1 or IN2 is triggered and the option is
Both or Relay
 See “Digital inputs IN1 and IN2” on page 63 for how to select the Fault action required
for this feature

Note
 Faults can be indicated using the output current if the Current or Both options are
selected (see “Set-up the current output” on page 68)

PV Limits mode relay

Menus:
SETUP / [CONTROLLER /] OUTPUT / RELAY / RELAY 1, / RELAY 2, etc.

This relay mode uses the relay On Point and Off Points (e.g. P411 and P412) as high and low
limit alarms for the control unit PV value (D800). The points can be in any order of value.

The relay is energized while the PV value exceeds the higher limit point value or while it is below
the lower limit point value.

Rate of Change mode relay

Menus:
SETUP / [CONTROLLER /] OUTPUT / RELAY / RELAY 1, / RELAY 2, etc. and
MONITOR / [CONTROLLER /] READINGS / Rate of Change

A rate of change value for the control unit PV value (D800) is calculated every 5 seconds in units
of PV per minute:

D809 = (PVnow - PV5 seconds ago) * 12

The On and Off points of a Rate of Change (RoC) mode relay are used as high and low limits for
read-only parameter D809. Limit values are in units of PV per minute (PV/min) and can be in any
order of value. The relay is energized while D809 exceeds the higher limit value or falls below the
lower limit value.

Typically, where the PV value is a liquid level measurement, the RoC relay can be used to warn of
a quickly rising or falling liquid level. Alternatively, the RoC mode relay can be used for
controlling the rate of liquid flow.

For further uses of D809, see “Pump Efficiency alarm (Mobrey MCU901 and MCU902 only)” on
page 89 and “Pumped volume totalizing” on page 90.

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Pump On Delay
Menu: SETUP / [CONTROLLER /] OUTPUT / RELAY / OVERRIDES

P499 Pump On Delay (Factory default is “3 s”)

 This function is to prevent pumps from all being switched on simultaneously, which
could cause a massive surge
 When multiple relays are used for pump control (or as a set point) and power is lost,
this function provides a delay of 0 up to 9 seconds (3 seconds by default) for the
second, third, fourth, and fifth relay when power is re-established

Auto-sequence (Mobrey MCU901 and MCU902 only)

(Special Control Function – see Table 4-5 on page 73 for a full list)

Optional automatic rotation of the leading (most used) relay can be applied to Assist or Standby
mode relays. To use these options, two or more relays must have the same mode. The lowest
numbered relay is initially the lead relay.

Note
 The rotation of relays is performed without the actual swapping of values between
relay parameters.

P270 Auto Seq Enable (Factory default is “Off”)

 Select a rotation auto-sequence. All options are summarized in Table 4-6

P271 Auto Seq Qual (Factory default is 0)

 This defines the threshold (e.g. how many starts) before applying an auto-sequence to
rotate the 'lead' to the next relay with the same mode

Table 4-6. Auto-sequence options

Option Rotation basis
Standby Starts For Standby mode relays only - rotation is based on how many times the 'leading' relay has
been energized compared to parameter P271.
Stdby On Time For Standby mode relays only - rotation is based on the hours that the 'leading' relay has been
energized compared to parameter P271.
Stdby Ratio T (1) For two Standby mode relays only - rotation is based on the ratio of ON time for two relays
compared to P271.
Stdby Ratio S (1) For two Standby mode relays only - rotation based on the ratio of starts (times energized)
compared to P271.
Assist Starts Rotation of 'leading' Assist mode relay is based on how many times it has been energized
compared to P271.
Assist On Time Rotation of 'leading' Assist mode relay is based on the hours that it has been energized
compared to P271.
Assist Ratio T (1) For two Assist mode relays only - rotation based on the ratio of ON time for the two relays
compared to P271.
Assist Ratio S (1) For two Assist mode relays only - rotation based on the ratio of starts (times energized)
compared to P271.
Off No rotation required.
(1) Ratio is based on the first two lowest-numbered relays with the same mode.

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Energy saving
(Special Control Function – see Table 4-5 on page 73)

Menu: SETUP / [CONTROLLER /] OUTPUT / RELAY / OVERRIDES

P275 Engy Save Strt (Factory default is 0:00 h:m)
 Set the time of day at which selected relays (P276) will energize until each relay Off
Point is reached. The energy saving start time is valid for one minute; if missed by the
MCU900 Series control unit being in Program mode, no action is taken when
subsequently put into Run App mode.

P276 Engy Save RL (Factory default is 00000)

 Select relays for the operation associated with parameter P275
 Each digit represents a relay. Relay RL1 is selected by editing the first digit to be a “1”.
Similarly, relay RL5 is selected with the fifth digit. To de-select a relay, change the
appropriate digit back to a “0”

Scum line prevention (Mobrey MCU901 and MCU902 only)

(Special Control Function – see Table 4-5 on page 73 for a full list of auxiliary relay functions)

This special control function is normally used with a pump control application to provide a small
variance in the start and stop level for the pump. It will help to prevent a build-up of scum on the
side of a wet well or sump.

Menu: SETUP / [CONTROLLER /] OUTPUT / RELAY / OVERRIDES

P277 Scum line var (Factory default is 0.0)
 This parameter defines a maximum variance in the On Points and Off Points of selected
relays (P278). The variance is entered in the units of the On/Off Point, spaced in ten
equal increments within the On Point and Off Point limits. Each time the selected relays
(P278) de-energize, the variance moves on an increment

P278 Scum line RL (Factory default is 00000)

 Select relays for the operation associated with parameter P277
 Each digit represents a relay. Relay RL1 is selected by editing the first digit to be a “1”.
Similarly, relay RL5 is selected with the fifth digit. To de-select a relay, change the
appropriate digit back to a “0”

Pump-down (Mobrey MCU901 and MCU902 only)

(Special Control Function – see Table 4-5 on page 73 for a full list)

In a pump-down application, the lowest relay Off Point ('pump off' level) is normally a fixed level
above the Transmitter Bottom Reference point. However, it is sometimes required to make the
pumps continue to run for a period past the Off Point or run down the level to the Transmitter
Bottom Reference point. This can clear a sump of sludge that may have collected at the bottom.

Pump-down can be initiated automatically at pre-set intervals. A digital input can also initiate
pump-down at any time and this will re-set the interval before the next pump-down.

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Pump-down automatically stops when the control unit PV (D800) is zero or after 20 minutes if a
duration (P274) has not been programmed, whichever is the shorter period.

Note
 For details on configuring a digital input to initiate a pump-down operation,
see “Digital inputs IN1 and IN2” on page 63

Menu: SETUP / [CONTROLLER /] OUTPUT / RELAY / OVERRIDES

The relay mode must be Set point, Assist or, Standby, and parameters P272 to P274 edited to
set-up the pump down operation.

P272 Pump down RL (Factory default is 00000)

 This is for selecting relays for a pump-down operation
 Each of the five digits represents a relay. Relay RL1 is selected by editing the first digit to
a “1”. Similarly, relay RL5 is selected by editing the fifth digit. To de-allocated, edit the
appropriate digit back to a “0”

P273 Pump down Int (Factory default is 000:00 h:m)

 This defines a fixed interval (hours and minutes) between pump-downs

P274 Pump down Dur (Default setting is 00:00)

 This defines the period (hours and minutes) that the relay will remain energized for the
pump-down. Safeguards may extend or reduce this period (see “Relay safeguard
options” on page 71)

D845 Next pump-down h:m (Factory default is 000:00)

 This shows the time remaining before the next pump-down is started. The display
shows 000:00 if a pump-down is in progress or if it is not set-up

Custom mode relay

(Special Control Function – see Table 4-5 on page 73 for a full list)

A custom mode relay is typically used together with a secondary external device to provide a
voltage-free contact connected to one of the controller digital inputs (IN1 or IN2).

For example, this function may be used to provide a low flow cut-off for a pump control if the
pump is provided with a flow/no-flow switch. A second relay contact assigned to pump control
would then be wired in series with the Custom mode relay to provide the low flow cut-off.
Menu: SETUP / [CONTROLLER /] APPLICATION / CUSTOM

P250 Start On (Factory default is “None”)

 Relay energizes when the selected condition is true. See also Table 4-7 on page 87

P251 Stop On (Factory default is “None”)

 Relay de-energizes when the selected condition is true. See also Table 4-7 on page 87

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P252 Stop If (Factory default is “None”)

 Relay de-energizes when the selected condition is true. See also Table 4-7 on page 87.
P252 is a fail-safe for P251

P253 Start Time (Factory default is “7:00” - i.e. 7AM)

 This defines the clock time for when a Custom mode relay operation will begin
(if P250 = Time) or end (if P251 = Time)

P254 Interval (Factory default is “1:00” i.e. 1hr 0min)

 This is for defining the interval for repeating a Custom mode relay operation. P255 and
P256 are for setting up a second starting time and an associated interval

P257 Max Retries (Factory default is 10)

 This defines the maximum number of failed attempts to perform Custom mode relay
operations before it is deemed an alarm condition.
 The alarm condition can happen if the control unit is in Program mode, which prevents
all Custom mode relay operations from starting. Also, it can happen when the
maximum time for an energized relay (relay safeguard, page 71) has been reached and
is preventing a Custom mode relay operation from completing. For alarm indication
options, see “Set-up alarms” on page 91

Table 4-7. P250/P251/P252 options

Start on Stop on Stop if
Options Purpose of option (P250) (P251) (P252)
None Switched off. Yes Yes Yes
Time P253 and P254 determine when a Custom mode relay is to Yes Yes -
be energized.
PV > Level Energize a Custom mode relay when the control unit PV Yes - -
value (D800) is greater than the relay On Point.
PV < Level De-energize a Custom mode relay when the control unit PV - Yes Yes
value (D800) less than the relay On point.
Ext Trig(1)(2) Energize a Custom mode relay when a digital input is Yes Yes Yes
active.
Ext Trig Xs(1)(2) When a Digital Input is active, de-energize a Custom mode - - Yes
relay after X seconds delay.
(1) This does not require Digital Input IN1 or IN2 to be allocated an action
(2) Abbreviations: "Ext Trig" = External Trigger (Digital Input)

Note
 For any of the alarms below to be indicated by a relay or current output, an indication
method must be selected. See “Alarm indication selection” on page 91 for details

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Relay Operations alarm

(Special alarm – see Table 4-5 on page 73 for a full list of auxiliary relay functions)

Menu: SETUP / [CONTROLLER /] APPLICATION / ALARM

P491 RL operations (Factory default is 0)
 It is an alarm condition when the number of operations done by a selected relay (P492)
is higher than the number in P491
 Relay operation counters parameters D811 to D815 are in the MONITOR menu.
See also “Health checking the MCU900 Series control unit” on page 110
 For alarm indication options, see “Set-up alarms” on page 91

P492 RL ops rly sel (Factory default is "Disabled")

 Select the relay for the monitoring operation associated with parameter P491

Relay Run-time alarm

(Special alarm – see Table 4-5 on page 73 for a full list of auxiliary relay functions)

Menu: SETUP / [CONTROLLER /] APPLICATION / ALARM

P493 RL runtime (Factory default is 0:00 h:m = OFF)
 It is an alarm condition when a relay, selected by P494, has been energized for longer
than the period (hours and minutes) set by P493
 Run-time counters parameters D821 to D825 are in the MONITOR menu.
See also “Health checking the MCU900 Series control unit” on page 110
 For alarm indication options, see “Set-up alarms” on page 91

P494 RL run rly sel (Factory default is "Disabled")

 Select the relay for the monitoring operation associated with parameter P493

Note
 For any of the alarms below to be indicated by a relay or current output, an indication
method must be selected. See “Alarm indication selection” on page 91 for details

No Activity alarm
(Special alarm - see Table 4-5 on page 73 for a full list of auxiliary relay functions)

Menu: SETUP / [CONTROLLER /] APPLICATION / ALARM

P497 No Activity Del (Factory default is 0:00 h:m)
 It is an alarm condition if there is no relay activity for the period (hours and minutes)
defined by parameter P497. Relays are selected for monitoring using parameter P498.
The alarm condition is cleared when any of the monitored relays are energized
 For alarm indication options, see “Set-up alarms” on page 91

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P498 No Activity RL (Factory default is 00000)

 Select relays for the relay inactivity monitoring operation
 Each digit represents a relay. Relay RL1 is selected for monitoring by editing the first
digit to be a “1”. Similarly, relay RL5 is selected with the fifth digit. To de-select a relay,
change the appropriate digit back to a “0”

Rising Level alarm

(Special alarm – see Table 4-5 on page 73 for a full list of auxiliary relay functions)

Menu: SETUP / [CONTROLLER /] APPLICATION / ALARM

P490 R Lev alrm del (Factory default is 0:00 m:s)
 The Rising Level alarm requires a minimum of one Assist or Standby mode relay.
If any Standby relay is energized, monitoring of the rising level is activated. For Assist
relays, they must all be energized for monitoring of the rising level to be activated.

A timed delay (P490) starts after the monitoring is activated. If the level is still rising
after the delay time has expired and the calculated rate of change of the control unit PV
(D800) is positive, the result is a Rising Level alarm condition. The alarm condition stops
as soon as the rate of change is negative, indicating a falling level.

 For the Rising Level alarm to be indicated by a relay output or the current output, a
method must be selected. See “Set-up alarms” on page 91
 See also “Rate of Change mode relay” on page 83

Pump Efficiency alarm (Mobrey MCU901 and MCU902 only)

(Special alarm – see Table 4-5 on page 73 for a full list of auxiliary relay functions)

The pump efficiency feature allows an alarm to be indicated (P550, P4*1) if the calculated
pump efficiency falls below a defined limit (P495).

Menu: SETUP / [CONTROLLER /] APPLICATION / ALARM

P495 Pump effy limit (Factory default is 0% = OFF)
 It is an alarm condition while the calculated pump efficiency is below the limit defined
by P495. The pump efficiency calculation is based on the rate of change of the control
unit PV (D800) and is independently monitored for each selected relay (P496)
 Pump efficiency values for relays are saved in D861 to D864, located in the MONITOR
menu. See also “Health checking the MCU900 Series control unit” on page 110.

P496 Pump effy RL (Factory default is 0000)

 Select relays for pump efficiency limit monitoring operation
 Each digit represents a relay. Relay RL1 is selected by editing the first digit to be a “1”.
Similarly, relay RL4 is selected with the fourth digit. (Relay RL5 does not support this
feature.) To de-select a relay, change the appropriate digit to a “0”

Pump efficiency (PE) is calculated using the rate of change (RoC) of the control unit PV while a
relay is energized. The PE value is saved in D86*; the “*” is the number of the relay (1 to 4)

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The calculation assumes that liquid continues to enter the well or tank at the rate just prior to
the relay energizing (pump starting).

The control unit continuously calculates the rate of change, sampling a new control unit PV
every 5 seconds (as described in Section “Rate of Change mode relay” on page 83).

Over the next 9 pump starts, a further 9 change of RoC values are stored such that the control
unit can then calculate an average value in change of RoC. This average value, “RoC100” is then
taken as being equivalent to the pump operating at 100% efficiency. A value of 100% is then
stored in D86*.

Each subsequent pump start, and change in RoC thereafter, is used in a rolling average
calculation for a new average value in change of RoC, RoCnew, which is then compared to the
previous value “RoC100” and a new PE percentage value calculated using:

PE % = (RoCnew / RoC100) * 100

If the resulting PE is greater than 100%, the RoC100 is updated to the new value and the PE is
re-stated as 100% based on this new value.

If the resulting PE is less than 100%, then the PE is calculated as above and stored in D86*

If the PE is below the limit set (P495), the PE alarm condition is true. To indicate an alarm by
Relay or Current Output, a method must be selected (see “Set-up alarms” on page 91).

Note
 The alarm condition is automatically cleared if the calculated PE rises above the limit
(P495) by 5% or more

Pumped volume totalizing

(Totalizer Option – see Table 4-5 on page 73 for a full list of auxiliary relay functions)

This function is for calculating the total throughput in a contents volume application.

The control unit monitors the change in volume when no pumps are running i.e. when any
Assist or Standby mode relay is de-energized. It calculates the rate of change (RoC) of the
control unit PV (D800) every five seconds and then converts it to a rate of change per minute for
displaying as parameter D809.

When a pump is turned on, the control unit assumes that the rate of inflow remains the same as
it was just before starting the pumps. The RoC value (D809) is frozen while the pumps are on i.e.
when any Assist or Standby mode relay is energized.

To totalize pumped volume, the control unit PV (D800) must be in volume units so that the RoC
value (D809) is in units of volume per minute. The control unit integrates this volume every
second and increments the totalizer for every integer unit.

If the RoC value (D809) is 12 m3 per minute and the Total factor parameter (P530) is set to
1.0 (m3), the Totalizer count (D828) increments every five seconds (1/12th of a minute).

Note
 The Totalizer Wizard can be used to set-up pumped volume totalizing.

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Menu: SETUP / [CONTROLLER /] OUTPUT / TOTALIZER

P530 Total factor (Factor default is 0.0)

 One count is added to the Totalizer count (D828) for a quantity defined by P530

P531 Total units (Factory default is "None")

 Pumped volume totalizing is enabled by the totalizer units (P531) being set to PVol.
(This parameter also defines the display units for parameter D828).

Note
 For other associated parameters, see “Set-up totalizing on the Mobrey MCU901 control
unit” on page 95.

4.5.22 Set-up alarms

Alarms
The MCU900 Series control unit can detect the following alarm conditions:
 Control unit Primary / Process Value (PV) is out-of-limits
 Current Output saturated
(Standard:  3.9mA or  20.8mA, NAMUR NE43:  3.8mA or  20.5mA)
 Logging memory filling (Mobrey MCU90F)
 Logging memory full (Mobrey MCU90F)
 Digital input is configured to force an alarm when active
 Maximum number of failed Custom relay operation attempts
 Current Input saturated
 Rising liquid level
 Relay operation count limit exceeded
 Relay run time limit exceeded
 Low pump efficiency (on the MCU901 and MCU902 only)
 Relay inactivity

Parameter D830 shows a list of active alarms. Alarms are indicated using relay outputs and the
current output. Table 4-8 on page 94 has a summary of reporting methods for alarms.

Alarm indication selection

Menu: SETUP / [CONTROLLER /] OUTPUT / ALARM

For each alarm, there is a dedicated parameter in the ALARM menu for selecting the method of
indication for that alarm. Options for parameters P540 to P551 are:
 None – if the alarm is to be indicated (default factory setting)
 Both – alarm is indicated by an Alarm mode relay and output current
 Current – alarm is indicated by the output current only
 Relay – alarm is indicated by an Alarm mode relay only

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For information on Alarm mode relays, see “Set-up the relays” on page 69.

Parameter P402 is used to decide how the output current indicates an alarm condition.
See “Set-up the current output” on page 68 for alarm action options.

P540 PV Over Limits (Factory default is "None")

 Select the indication method for the alarm condition that happens while the control
unit PV value is outside pre-set limits. See also “PV Limits mode relay” on page 83

P541 mA Out Sat (Factory default is "None")

 Select the indication method for the alarm condition that happens while the
output current is  3.8 mA or 20.5 mA

P542 Log mem filling (Factory default is "None")

 Select the indication method for the alarm condition that happens while the available
logging memory is low. See also “P593 Low Mem Alarm (Default is 0%)” on page 64

P543 Digital Input (Factory default is “None”)

 Select the indication method for the alarm condition that happens while a digital input,
configured with an action to force this alarm, is energized.
 See “Digital inputs IN1 and IN2” on page 63 for how to select the Alarm action required
for this feature

P544 Max retries (Factory default is “None”)

 Select the indication method for the alarm condition that happens while a Custom relay
operation is unable to complete, even after a pre-set number of attempts (P257)
 See also “Custom mode relay” on page 86 for information

P545 mA In Sat (Factory default is "None")

 Select the indication method for the alarm condition that happens while the output
current is saturated i.e.  3.7 mA or  20.75 mA

P547 Rising Level (Factory default is "None")

 Select the indication method for the Rising Level alarm condition
 See “Rising Level alarm” on page 89 for information

P548 RL Operations (Factory default is "None")

 Select the indication method for the alarm condition that happens while a relay
operation counter is higher than a pre-set limit
 See “Relay Operations alarm” on page 88 for information

P549 RL runtime (Factory default is "None")

 Select the indication method for the alarm condition that happens while a relay is
energized for longer than a pre-set period
 See “Relay Run-time alarm” on page 88 for information

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P550 Pump efficiency (Factory default is "None")

 Available on the Mobrey MCU901 and MCU902 control units only
 Select the indication method for the alarm condition that happens while the calculated
pump efficiency falls below a pre-set limit
 See “Pump Efficiency alarm (Mobrey MCU901 and MCU902 only)” on page 89 for
information

P551 No activity (Factory default is “None”)

 Select the indication method for the alarm condition that happens while any selected
relay is de-energized for longer than a pre-set period
 See “No Activity alarm” on page 88 for information

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Table 4-8. Reporting of alarms and faults on the control unit
Alarm Fault
June 2014

Full PV Relay Current Report Report

Category Source Cause As seen on screen Status LED Display Output Output (D830) (D831)
ALARM MCU900 Current Output reached linear limit mA o/p Sat Yes Yes Yes
Logging memory almost full Lg Mem Filling Yes Yes Yes
Logging memory is full Log Mem Full Yes Yes
Digital Input 1 active Digital In 1 Yes Yes Yes
Digital Input 2 active Digital In 2 Yes Yes Yes
Alarm suppressed by digital input Alarm Suppressed Yes
Section 4: Getting started

Custom relay operation retries exceeded Max Retries Yes Yes Yes
Current input below lower linear limit mA In Low Yes Yes Yes
Current input above higher linear limit mA In High Yes Yes Yes
Raising level despite relays on Rising Level Yes Yes Yes
Relay number of operations exceeded Relay Operations Yes Yes Yes
Relay run-time exceeded Relay Runtime Yes Yes Yes
Pump efficiency below limit (1) Pump Efficiency Yes Yes Yes
No activity of Control Relay No activity Yes Yes Yes
XMTR Transmitter PV out-of-limits PV OL Yes Yes
FAULT MCU900 Rom checksum error ROM Error Constant Yes Yes Yes Yes
RAM test error RAM Error Constant Yes Yes Yes Yes
Real Time Clock Fault Clock fault Constant Yes Yes Yes Yes
EEPROM Signature Error EEPROM Sig err Constant Yes Yes Yes Yes
EEPROM checksum error EEPROM CKS err Constant Yes Yes Yes Yes
ADC error ADC_error Constant Yes Yes Yes Yes
Control Unit temperature out-of-limits CU Temp OL Constant Yes Yes Yes
Xmtr Field Device Malfunction Xmtr Fault Constant Yes Yes Yes Yes
(1) The pump efficiency feature is on Mobrey MCU901 and MCU902 control units.
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4.5.23 Set-up totalizing on the Mobrey MCU901 control unit

Totalizer (cumulative totalized flow) on the Mobrey MCU901
The MCU901 has an internal 8-digit totalizer that is updated several times every second.

Note
 The totalizer operates with an input of the control unit PV (D800) in units per second.
When the PV is a volumetric flow rate (e.g. m3/hour), the totalizer can accumulate this
flow volume and give the total volume throughput

The totalizer can be easily set-up using the Totalizer Wizard, accessible by navigating to the
TOTALIZER menu. The Totalizer Wizard also forms a part of the Application (App) Wizard.
See “Using the App Wizard to set-up a flow application” on page 41 for a totalizing example.
After using the Totalizer or App Wizard, adjustments can be made to the totalizer parameters.

Note
 The wizard requires the totalizer source parameter to have suitable units selected
e.g. m3/hour. If no suitable units are selected, an 'invalid units' message appears.

Figure 4-43. Navigating to the TOTALIZER menu

Note: The SELECT INSTRUMENT menu does not
MAIN MENU
SETUP appear unless a HART transmitter is connected.
Run App?
MONITOR SELECT INSTRUMENT
Controller: ****
Tx1: **** #1 x2
SETUP
APPLICATION
DISPLAY x2
OUTPUT OUTPUT
CURRENT OUTPUT
RELAY
TOTALIZER 1 TOTALIZER
Totalizer Wizard
Total Factor
Total Units
Note: The Mobrey MCU901 screens are shown here.

Menu: SETUP / [CONTROLLER /] OUTPUT / TOTALIZER

P530 Total Factor (Factor default is 0.0)

 One count is added to the Totalizer Count (D828) for a quantity of liquid as defined by
this parameter. The display units for D828 is defined by P531.

P531 Total Units (Factory default is “None”)

 This parameter defines the units for the Totalizer Count (D828).
When using totalizer units of gal, an 8-digit totalizer increments rapidly and rolls over
too frequently. To help, alternative totalizer units of galx10, galx100, galx1000,
and Mgal are available for selection. When these special units are selected after
selecting gal units, the totalizer factor (P530) is automatically re-scaled by x10, x100,
x1000, or x1000000 depending on the selection. Similarly, re-scaling is automatic for
ltrx10, ltrx100, etc. after selecting ltr as totalizer units.

See “Using the App Wizard to set-up a flow application” on page 41 for a flow
application example where galx100 totalizer units are needed.
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P534 Pulse Width (Factory default is “100 ms”)

 A Totalizer mode relay is energized for a programmed duration (P534) each time the
Totalizer Count (D828) is incremented. Parameter P534 controls the pulse width (i.e.
the pulse 'on' time) and is between 10 ms and 2.5 s, changeable in steps of 10 ms. See
“Set-up the relays” on page 69 for information on Totalizer mode relays
 Parameter P534 also defines the pulse width for a Sampler mode relay
(see “Set-up the relays” on page 69)
Menu: MONITOR / [CONTROLLER /] READINGS / TOTALIZER

D828 Totalizer
 This parameter displays the Totalizer Count. To add this to the Full PV Display,
see “Display configuration options” on page 102.

How to reset the totalizer on the Mobrey MCU901

Menu: MONITOR / [CONTROLLER /] READINGS / TOTALIZER

To re-set a totalizer to zero, display the Totalizer Count parameter D828 and then press the
button corresponding to Reset command on display line 4.

The totalizer may have password (PIN) protection to prevent unauthorized persons from
re-setting the total. See “PIN Security” on page 105 for full details of PIN security.

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4.5.24 Set-up totalizing on the Mobrey MCU902 control unit

The Mobrey MCU902 has two independent, internal 8-digit totalizers, Totalizer 1 and
Totalizer 2, which are updated several times every second.

The totalizers can be easily set-up using the Totalizer Wizard, accessible by navigating to the
SETUP / [CONTROLLER /] OUTPUT / TOTALIZER menu. The Totalizer Wizard also forms a part of
the Application (App) Wizard.

Note
 The wizards require the totalizer source parameter to have suitable units selected
e.g. m3/hour. If no suitable units are selected, an 'invalid units' message appears.
 See “Using the App Wizard to set-up a flow application” on page 41 for a totalizing
example. After using the Totalizer or App Wizard, adjustments can be made to the
totalizer parameters.

Set-up Totalizer 1

Note
 The totalizer operates with an input of control unit PV (D800) in units per second.
If the PV is a volumetric flow rate (e.g. m3/hour), the totalizer can accumulate this flow
volume and give the total volume throughput

Menu: SETUP / [CONTROLLER /] OUTPUT / TOTALIZER

P530 Total 1 factor (Factor default is 0.0)

 One count is added to the Totalizer count (D828) for a quantity of flow as defined by
this parameter. The unit of measurement for D828 is defined by parameter P531

P531 Total 1 units (Factory default is “None”)

 This parameter defines the units for the Totalizer 1 Count (D828).
When using totalizer units of gal, an 8-digit totalizer increments rapidly and rolls over
too frequently. To help, alternative totalizer units of galx10, galx100, galx1000,
and Mgal are available for selection. When these special units are selected after
selecting gal units, the totalizer factor (P530) is automatically re-scaled by x10, x100,
x1000, or x1000000 depending on the selection. Similarly, re-scaling is automatic for
ltrx10, ltrx100, etc. after selecting ltr as totalizer units.

See “Using the App Wizard to set-up a flow application” on page 41 for a flow
application example where galx100 totalizer units are needed.

P534 Pulse Width (Factory default is “100ms”)

 A Totalizer mode relay is energized for a programmed duration (P534) each time the
Totalizer count (D828 or D829) is incremented. P534 controls the pulse width
(i.e. the pulse 'on' time) and is between 10 ms and 2.5 s, changeable in steps of 10 ms
 Parameter P534 also defines the pulse width for a Sampler mode relay
(see “Set-up the relays” on page 69)

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Menu: MONITOR / [CONTROLLER /] READINGS / TOTALIZER

D828 Totalizer 1
 This read-only parameter displays the Totalizer 1 Count. To add this to the Full PV
Display, see “Display configuration options” on page 102.

Note
 A Totalizer mode relay can be configured to output a pulse for each increment (by one)
to the Totalizer 1 Count parameter. See “Set-up the relays” on page 69 for information
on Totalizer mode relays

Set-up Totalizer 2
Totalizer 2 operates in the same way as Totalizer 1, but counts the parameter selected by P536.
Parameter P536 offers a choice of control unit PV, SV, TV, and FV.
Menu: SETUP / [CONTROLLER /] OUTPUT / TOTALIZER

P532 Total 2 factor (Factor default is 0.0)

 One count is added to the Totalizer 2 Count (D829) for a quantity of liquid as defined by
this parameter. The units for D829 is defined by P533.

P533 Total 2 units (Factory default is "None")

 This parameter defines the units for the Totalizer 2 Count (D829).
When using totalizer units of gal, an 8-digit totalizer increments rapidly and rolls over
too frequently. To help, alternative totalizer units of galx10, galx100, galx1000,
and Mgal are available for selection. When these special units are selected after
selecting gal units, the totalizer factor (P532) is automatically re-scaled by x10, x100,
x1000, or x1000000 depending on the selection. Similarly, re-scaling is automatic for
ltrx10, ltrx100, etc. after selecting ltr as totalizer units.

See “Using the App Wizard to set-up a flow application” on page 41 for a flow
application example where galx100 totalizer units are needed.

P534 Pulse Width (Factory default is “100ms”)

 A Totalizer mode relay is energized for a programmed duration (P534) each time the
Totalizer count (D828 or D829) is incremented. P534 controls the pulse width
(i.e. the pulse 'on' time) and is between 10 ms and 2.5 s, changeable in steps of 10 ms
 Parameter P534 also defines the pulse width for a Sampler mode relay
(see “Set-up the relays” on page 69)

P536 Totalizer 2 Source (Factory default is “None”)

 If requiring Totalizer 2, select a parameter to be totalized
Menu: MONITOR / [CONTROLLER /] READINGS / TOTALIZER

D829 Totalizer 2
 This read-only parameter displays the Totalizer 2 Count. To add this to the Full PV
Display, see “Display configuration options” on page 102.

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How to reset the totalizers on the Mobrey MCU902

To re-set a totalizer to zero, display the Totalizer Count parameter e.g. D828 and then press the
button corresponding to Reset command on display line 4.

The totalizers may have password (PIN) protection to prevent unauthorized persons from
re-setting the totals. See “PIN Security” on page 105 for full details of PIN security.

4.5.25 Set-up totalizing on the Mobrey MCU90F control unit

The Mobrey MCU90F control unit has two totalizers: Totalizer 1 and Totalizer 2.

The totalizers can be easily set-up using the Totalizer Wizard, accessible by navigating to the
SETUP / [CONTROLLER /] OUTPUT / TOTALIZER menu. The Totalizer Wizard also forms a part of
the Application (App) Wizard.

Note
 The wizards require the totalizer source parameter to have suitable units selected
e.g. m3/hour. If no suitable units are selected, an 'invalid units' message appears.

See “Using the App Wizard to set-up a flow application” on page 41 for a totalizing example.
After using the Totalizer or App Wizard, adjustments can be made to the totalizer parameters.

Set-up Totalizer 1 (cumulative totalized flow)

This is an 8-digit totalizer showing cumulative totalized flow through a flow structure.

Note
 Totalizer 1 operates with an input of control unit PV (D800) in units per second.
If the PV is a volumetric flow rate (e.g. m3/hour), the totalizer can accumulate this flow
volume and give the total volume throughput. See “Pumped volume totalizing” on
page 90 for pumped volume totalizing

Menu: SETUP / [CONTROLLER /] OUTPUT / TOTALIZER

P530 Total 1 Factor (Factor default is 0.0)

 One count is added to the Totalizer Count (D828) for a quantity of liquid as defined by
this parameter. The display units for D828 is defined by P531.

P531 Total 1 Units (Factory default is "None")

 This parameter defines the units for the Totalizer Count (D828).
When using totalizer units of gal, an 8-digit totalizer increments rapidly and rolls over
too frequently. To help, alternative totalizer units of galx10, galx100, galx1000,
and Mgal are available for selection. When these special units are selected after
selecting gal units, the totalizer factor (P530) is automatically re-scaled by x10, x100,
x1000, or x1000000 depending on the selection. Similarly, re-scaling is automatic for
ltrx10, ltrx100, etc. after selecting ltr as totalizer units.

See “Using the App Wizard to set-up a flow application” on page 41 for a flow
application example where galx100 totalizer units are needed.

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P534 Pulse Width (Factory default is “100ms”)

 A Totalizer mode relay is energized for a programmed duration (P534) each time the
Totalizer count (D828 / D829) is incremented. P534 controls the pulse width
(i.e. the pulse 'on' time) and is between 10 ms and 2.5 s, changeable in steps of 10 ms
 Parameter P534 also defines the pulse width for a Sampler mode relay
(see “Set-up the relays” on page 69)

Note
 See “Set-up the relays” on page 69 for information on Totalizer mode relays

Menu: MONITOR / [CONTROLLER /] READINGS / TOTALIZER

D828 Totalizer 1
 This read-only parameter displays the Totalizer 1 count, which is the cumulative
totalized flow. To add this to the Full PV Display, see “Display configuration options” on
page 102

Set-up Totalizer 2 (daily totalized flow)

This is an 8-digit totalizer showing daily total flow (midnight to midnight) through a flow
structure. It is automatically re-set to zero at each midnight.

Note
 A relay on the control unit can be configured to output a pulse for each increment to
the Totalizer Count parameter. See “Set-up the relays” on page 69 for how to do this

Menu: SETUP / [CONTROLLER /] OUTPUT / TOTALIZER

P532 Total 2 Factor (Factor default is 0.0)

 One count is added to the Totalizer 2 Count (D829) for a quantity of liquid as defined by
this parameter. The display unit of measurement for D829 is defined by P533

P533 Total 2 Units (Factory default is "None")

 This parameter defines the units for the Totalizer 2 Count (D829).

P534 Pulse Width (Factory default is “100 ms”)

 A Totalizer mode relay is energized for a programmed duration (P534) each time the
Totalizer Count (D828 or D829) is incremented. P534 controls the pulse width
(i.e. the pulse 'on' time) and is between 10 ms and 2.5 s, changeable in steps of 10 ms
 Parameter P534 also defines the pulse width for a Sampler mode relay
(see “Set-up the relays” on page 69)

Note
 See “Set-up the relays” on page 69 for information on Totalizer mode relays

P536 Total 2 Source (Factory default is “MCU PV”)

 Use this to select whether the control unit PV (D800), SV (D801), TV (D802) or FV
(D803) value is to be totalized over a 24 hours period for the Totalizer 2 Count (D829).
Alternatively, select None if not requiring Totalizer 2.
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See “Optional change: transmitter input channel settings (advanced users)” on page 43
for details of PV, SV, TV, and FV

P537 Total 2 dec pl (Factory default is 1)

 Use this to set the number of decimal places to be shown when displaying the
Totalizer 2 Count (D829)
Menu: MONITOR / [CONTROLLER /] READINGS / TOTALIZER

D829 Totalizer 2
 This read-only parameter displays the Totalizer 2 count, which is the daily flow total for
the present day. It is reset to zero at midnight.
To add this value to the PV display, see “Display configuration options” on page 102.
When showing on the upper display line, use the LEFT-ARROW or RIGHT-ARROW
buttons to scroll through daily flow totals from the previous 365 days. The Esc button
restores the upper display line to show the daily flow total value for the present day

How to reset the totalizers on the Mobrey MCU90F

To reset a totalizer to zero, display the Totalizer Count parameter e.g. D828 and then press the
button that corresponds to Reset command on display line 4.

Totalizers may have password (PIN) protection to prevent unauthorized persons from re-setting
the totals. See “PIN Security” on page 105 for full details of PIN security.

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4.5.26 Display configuration options

The factory default configuration of the full display can be changed to show different graphic
and text information.
Menu: SETUP / [CONTROLLER /] OUTPUT / DISPLAY

P570 Display Upper (Factory default is "P731-Time")

 Select from the multiple-choice list of parameters (see Table 4-9 on page 103).
For example, a totalizer count can be displayed when D828-Totalizer is selected.
If it will fit, the clock time will also be displayed alongside the selected parameter

P571 Display Middle (Factory default is "D800-PV")

 Select from the multiple-choice list of parameters (see Table 4-9 on page 103).
For example, the control unit Secondary Value (SV) value can be displayed when
D801-SV is selected

P572 Display Lower (Factory default is “Bar graph”)

 Select from the multiple-choice list of parameters (see Table 4-9 on page 103). For
example, you can display a user-defined message (P241) when the 'P241' option is
selected

P573 Decimal places (Factory default is 3)

 Use this to adjust the number of decimal places. Range 0 to 5. Alternatively, select
“Disabled” (Auto) for the control unit to automatically choose the number of decimal
places for a displayed parameter value

P574 Display size (Factory default is “Large”)

 Use this to adjust whether the display shows the Large PV Display after a period of
keypad inactivity, or remains showing the Full PV Display.

P575 Back light (Factory default is "On")

 Select from On (always on), Off (always off) or Auto (goes on when using keypad; goes
off after 5 minutes of inactivity)

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Table 4-9. Full PV Display options

P570/1/2 Options Parameters
None (Nothing selected)
D800-PV Control unit Primary / Process Variable (PV)
D801-SV Control unit SV value
D802-TV Control unit TV value
D803-FV Control unit FV value
D805-%mA Out Percentage of Current Output (4–20 mA span)
D806-mA Output Actual output current
D809-RoC Rate of Change of control unit PV
D828-Totalizer Totalizer value (for the MCU901)
D828-Totalizer 1 Totalizer 1 value (for the MCU902 and MCU90F)
D829-Totalizer 2 Totalizer 2 value (for the MCU902 and MCU90F)
D821-RL1 RTime Running time for relay RL1, if energized
D822-RL2 RTime Running time for relay RL2, if energized
D823-RL3 RTime Running time for relay RL3, if energized
D824-RL4 RTime Running time for relay RL4, if energized
D825-RL5 RTime Running time for relay RL5, if energized
D840-mA Input Actual current input
D844-Internal C Temperature inside of the control unit
D846 Logging memory remaining
D900-PV In Transmitter PV (Primary Variable)
D901-SV In Transmitter SV (Secondary Variable)
D902-TV In Transmitter TV (Tertiary Variable)
D903-FV In Transmitter FV (Fourth Variable)
P240-Descript (1) Free-form description
P241-Message (1) Free-form message
P242-Tag (1) Free-form tag name
P730-Date Date
P731-Time Time of day
Bar graph Bar graph for Current Output (for lower display only)
(1) Parameter is in menu: SETUP / [CONTROLLER /] APPLICATION

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4.5.27 Serial communications

This section is applicable if the RS232 serial port of a communication device (e.g. a PC)
is connected:
 directly to the RS232 terminals of the MCU901 or MCU902 control unit or
 indirectly via factory-fitted data download socket of the MCU90F control unit

Note
 See “RS232 connections” on page 22 for connections details.

Menu: SETUP / [CONTROLLER /] SYSTEM / COMMUNICATIONS

P710 Address (Factory default is 0)

 Keep the factory default setting.

P711 Interface
 Choose between Log download (Mobrey MCU90F), RS232 HART, or None.

P712 Baud Rate (Factory default is 1200 or 9600)

 This must be the same as set for the RS232 serial port of the communication device.
Range is 1200 to 115200.

P713 Start Bits (Factory default is 1)

 This must be the same as set for the RS232 serial port of the communication device.
Range is 0 to 9.

P714 Data Bits (Factory default is 8)

 This must be the same as set for the RS232 serial port of the communication device.
Range is 0 to 9.

P715 Parity (Factory default is “Even”)

 This must be the same as set for the RS232 serial port of the communication device.
Options are Even, Odd or None.

P716 Stop Bits (Factory default is 1)

 This must be the same as set for the RS232 serial port of the communication device.
Range is 0 to 9

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4.5.28 PIN Security

Personal Identification Number (PIN) security prevents unauthorized people from configuring
the control unit. Typically, this is set-up when all the other programming has been completed.
As with bankcards, there is one PIN number.

The factory default is for PIN security to be inactive. To activate, navigate the menu system to
the PIN screen and edit a 4-digit personal identification number (PIN) that you want. The PIN is
edited with the arrow keys and confirmed with the red (ENTER) button; the 4-digit PIN will then
be replaced by “- - - -” to indicate that PIN security is active. (By default, the PIN is “0” if inactive).

After PIN security is activated, a prompt for the PIN appears when needed for authorization. If
correctly entered, no further PIN requests are made unless there is a period of keypad inactivity,
or the Cancel Password option is selected from the MAIN MENU screen.

If the PIN number has been forgotten, contact Rosemount Measurement for assistance.
Please ensure that you have the serial number of the control unit available.
It is located in the menu system at: SETUP / [CONTROLLER /] SYSTEM / FIXED / Serial No.

Figure 4-44. Navigating to the PIN set-up screen

Note: The SELECT INSTRUMENT menu does not
MAIN MENU
SETUP appear unless a HART transmitter is connected.
Run App?
MONITOR SELECT INSTRUMENT
Controller: ****
Tx1: **** #1
x5
SETUP
INPUT CHANNEL
DIGITAL INPUT
SYSTEM SYSTEM
TEST
SETTINGS x5
DEFAULTS 1 SETTINGS
Keypad Sound
Language
PIN
PIN P740
0
Note: The Mobrey MCU901 screens are shown here. Esc=Quit =Edit

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Section 5 Servicing and Health Checking

Safety messages . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . page 107

Servicing the MCU900 Series control unit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . page 107
Health checking the MCU900 Series control unit . . . . . . . . . . . . . . . . . . . . . . . . . . . . page 110

5.1 Safety messages

Procedures and instructions in this section may require special precautions to ensure the safety
of the personnel performing the operations. Information that raises potential safety issues is
indicated by a warning symbol ( ). Please refer to the following safety messages before
performing an operation preceded by this symbol.
.

Failure to follow these installation guidelines could result in death or serious injury:
 The Mobrey MCU900 Series control unit must be installed, connected, commissioned,
operated, and maintained by suitably qualified personnel only, observing any national
and local requirements that may apply
 Use the equipment only as specified in this manual. Failure to do so may impair the
protection provided by the equipment
Explosions could result in death or serious injury:
 Please review the approvals section of this reference manual for any restrictions
associated with an installation
Electrical shock could cause death or serious injury:
 If the control unit is installed in a high voltage environment and a fault condition or
installation error occurs, high voltage may be present on leads and terminals
 Use extreme caution when making contact with the leads and terminals
 Make sure that power to the control unit is off while making connections

5.2 Servicing the MCU900 Series control unit

Before servicing, disconnect the power.

No maintenance is required beyond occasional cleaning of the enclosure with a damp cloth.
Solvents or bleaches should not be used.

Do not modify or repair the unit. There are no spare parts for the Mobrey MCU900
Series control unit. If a problem persists, contact Rosemount Measurement for advice.

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5.2.1 Replacing the fuse on mains ac-powered control units

Before starting, disconnect the power. Follow the procedure in Figure 5-1 (wall-mount units)
or Figure 5-2 (panel-mount unit). See "Electrical” on page 117 for the fuse type.

Figure 5-1. How to replace the fuse on a mains-powered wall-mount control units
Carefully turn the flat-bladed screwdriver Lift the fuse-holder upwards and away
anti-clockwise, until the fuse-holder is released. from the control unit.

Pull the old fuse out from the fuse-holder. Push the new fuse into the fuse-holder.

Carefully place the fuse-holder back, Push the fuse-holder downwards, and then twist
noting the vertical position of the notch. clock-wise until the fuse-holder stays in position.

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Figure 5-2. How to replace the fuse on a mains-powered panel-mount control unit

Carefully turn the flat-bladed screwdriver Lift the fuse-holder away

anti-clockwise, until the fuse-holder is released. from the control unit.

Pull the old fuse out from the fuse-holder. Push the new fuse into the fuse-holder.

Carefully place the fuse-holder back, Push the fuse-holder inwards, and then twist
noting the angled position of the notch. clock-wise until the fuse-holder stays in position.

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5.3 Health checking the MCU900 Series control unit

This section is a guide to the health check system, which includes tests, calibrations,
live readings, and diagnostic data for the MCU900 Series control unit.

5.3.1 Simulation (self-test)

Menu:
SETUP / [CONTROLLER /] APPLICATION / SIMULATION
The Simulation (or Self-Test) function is selected by pressing the red (ENTER) button at the
SIMULATION screen.

To start, press the UP-ARROW button once.

When started, the control unit Primary/Process Value (PV) is driven up to a maximum value
(P401) and then driven down to a minimum value (P400), continuously, therefore exercising
the Current Output and relays. It always begins at the 4 mA point.

A single cycle takes approximately 100 seconds to complete.

To pause at any time, press the UP-ARROW button. When paused, pressing the UP-ARROW
button once will resume the cycle. You can also press the DOWN-ARROW to pause, and press it
again to change direction of the cycle.

To quit at any time, even when paused, press the Esc button once to exit immediately to the
Full PV Display. The PV value calculation then immediately resumes being based on the
transmitter inputs.

5.3.2 Display test

Menu:
SETUP / [CONTROLLER /] SYSTEM / TEST / DISPLAY
The Display Test function is started by pressing the red (ENTER) button at the DISPLAY screen.

When the test is started, a pre-defined pattern sequence exercises all the LCD pixels. After
several seconds, the test ends by displaying the model code and software version number.

To re-run the Display Test, press the red (ENTER) button again. Otherwise, press the Esc button
to exit to the menu.

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5.3.3 Calibration of the Current Input (Iin)

Menu:
SETUP / [CONTROLLER /] SYSTEM / TEST / CURRENT INPUT
Procedure for 4 mA input calibration
1. Apply 4 mA to the Current Input (Iin) terminal.
(See "Electrical installation” on page 13 for terminal layouts and connection diagrams).

2. Select the 4 mA In Adjust menu option.

3. Press the red (ENTER) button once.

Procedure for 20 mA input calibration

1. Apply 20 mA to the Current Input (Iin) terminal.
(See "Electrical installation” on page 13 for terminal layouts and connection diagrams).

2. Select the 20 mA In Adjust menu option.

3. Press the red (ENTER) button once.

5.3.4 Fixing the Current Output (Iout)

Menu:
SETUP / [CONTROLLER /] SYSTEM / TEST / CURRENT OUTPUT
Procedure for temporarily fixing the Current Output
1. Select the Set Current menu option.

2. Edit a mA value in the range 4–20 mA.

3. Save the mA value to then fix the output current from the Current Output (Iout)
terminal at that level.
(See "Electrical installation” on page 13 for terminal layouts and connection diagrams).

Pressing the Esc button will exit to the menu and restore the output current to the level
corresponding to the control unit Primary/Process Value (D800).

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5.3.5 Calibration of the Current Output (Iout)

Menu:
SETUP / [CONTROLLER /] SYSTEM / TEST / CURRENT OUTPUT
Procedure for 4 mA output calibration
1. Select the 4 mA Out Adjust menu option.

2. Measure the output current from the Current Output (Iout) terminal.
(See "Electrical installation” on page 13 for terminal layouts and connection diagrams).

3. If the measured current is not 4 mA, edit the existing value to be the actual mA reading
and then save it.

Procedure for 20 mA output calibration

1. Select the 20 mA Out Adjust menu option.

2. Measure the output current from the Current Output (Iout) terminal.
(See "Electrical installation” on page 13 for terminal layouts and connection diagrams).

3. If the measured current is not 20 mA, edit the existing value to be the actual mA
reading and then save it.

5.3.6 Monitoring the control unit readings

Menu: MONITOR / [CONTROLLER /] READINGS
Answers
D800 PV ANSWERS / PV
 This is the live control unit Primary/Process Value (PV) that is described in the section
"Optional change: transmitter input channel settings (advanced users)” on page 43.
D801 SV ANSWERS / SV
 This is the live control unit Secondary Value (SV) that is described in the section
"Optional change: transmitter input channel settings (advanced users)” on page 43.
D802 TV ANSWERS / TV
 This is the live control unit Third/Tertiary Value (TV) value that is described in
"Optional change: transmitter input channel settings (advanced users)” on page 43.
D803 FV ANSWERS / FV
 This is the live control unit Fourth Value (FV) that is described in the section
"Optional change: transmitter input channel settings (advanced users)” on page 43.
D804 Ullage
 This indicates how much a vessel or open-channel falls short of being full. It is calculated
as the difference between the upper range value (URV) of the Current Output and the
control unit PV i.e. D804 = (P401 - D800)

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D805 % Current Output ANSWERS / % Current Out

 This indicates the present amount of electrical current being output from the 4–20 mA
Current Output as a percentage.

Note
 The output current is while the control unit is in the Program operating mode.

D806 Current O/P ANSWERS / Current Output

 This indicates the present amount of electrical current being output from the 4–20 mA
Current Output as a mA value.

Rate of change
D809 Rate of Change Rate of Change
 This indicates the calculated rate of change of the control unit PV.
See also "Rate of Change mode relay” on page 83 for how to use parameter D809
values.

Relay
D811 RL1 Ops RELAY / RELAY OPERATIONS
 This indicates the number of operations carried out by relay RL1. It can be re-set to zero
by pressing the red (ENTER) button when displaying D811.
The operation count is used by the Relay Operations Alarm feature
(see "Relay Operations alarm” on page 88).

D812 to D815 are the operation counters for other relays.

D820 Relay Status RELAY / Relay Status
 This indicates a series of 0 and 1 digits which represent the de-energized (0) or
energized (1) relays.
The first digit represents Relay RL1, the second digit represents Relay RL2, etc.
D821 RL1 Run-Time RELAY / RELAY RUN TIME
 This indicates the total time that relay RL1 has been energized for the present relay
operation. It is cumulative i.e. does not reset when the relay RL1 is de-energized.
The run-time is used by the Relay Run Time Alarm feature.
(see "Relay Operations alarm” on page 88).

D822 to D825 are the running times for the other relays.

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Totalizer (Mobrey MCU901 only)

D828 Totalizer Totalizer
 This indicates the totalizer count.
See "Set-up totalizing on the Mobrey MCU901 control unit” on page 95 for details of the
totalizing feature on the MCU901.

Totalizer (Mobrey MCU902 and MCU90F only)

D828 Totalizer 1 Totalizer
 This indicates the Totalizer 1 count.
See "Set-up totalizing on the Mobrey MCU902 control unit” on page 97 for details of the
totalizing feature on the MCU902.
See "Set-up totalizing on the Mobrey MCU90F control unit” on page 99 for details of the
totalizing feature on the MCU90F.
D829 Totalizer 2 Totalizer
 This displays the Totalizer 2 count.
See "Set-up totalizing on the Mobrey MCU902 control unit” on page 97 for details of the
totalizing feature on the MCU902.
See "Set-up totalizing on the Mobrey MCU90F control unit” on page 99 for details of the
totalizing feature on the MCU90F.

Alarm report
D830 Alarm Report
 This is for viewing live alarms.
The highest priority alarm is listed first. Use the UP/DOWN-ARROW buttons to scroll
through the list if more than one alarm exists. If there are no live alarms, the alarm
report indicates “none”.
See Table 4-8 on page 94 for a summary of other alarm reporting features.

Fault report
D831 Fault Report
 This is for viewing live faults.
The highest priority fault is listed first. Use the UP/DOWN-ARROW buttons to scroll
through the list if more than one fault exists. If there are no live faults, the fault report
indicates “none”.
See Table 4-8 on page 94 for a summary of other fault reporting features.

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5.3.7 Diagnostic data for the MCU900 Series control unit

Menu: MONITOR / [CONTROLLER /] DIAGNOSTICS
I/P status (input status)
D835 I/P Status
 This indicates a series of 0 and 1 digits which represent the inactive (0) and active (1)
digital trigger inputs.
The first digit represents digital trigger input IN1, and the second digit represents
digital trigger input IN2.

Current i/p (current input)

D840 Current I/P
 This indicates the present electrical input current in mA.
See the section "Optional change: transmitter input channel settings (advanced users)”
on page 43 for how this parameter is used.

mA input
D842 mA Input %
 This indicates the present electrical input current as a percentage of the 4–20 mA
range.
See "Optional change: transmitter input channel settings (advanced users)” on page 43
for how this parameter is used.

CU temperature
D844 CU Temperature
 This indicates the present operating temperature within the MCU900 Series control
unit.
If above 65 C, it is a fault condition (see "Fault mode relay” on page 82).

Next pump down

D845 Next Pump down
 This indicates the time remaining before the next pump-down is started.
See "Pump-down (Mobrey MCU901 and MCU902 only)” on page 85 for feature details.

Free memory (Mobrey MCU90F only)

D846 Free Memory
 This indicates the percentage of free memory remaining for the data logging feature.
See "P593 Low Mem Alarm (Default is 0%)” on page 64 for the Low Memory Alarm
feature details.

Date of change
D848 Date of Change
 This indicates the date on which a parameter was last edited.

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1st pwr date

D849 1st Pwr Date
 This indicates the date on which the control unit was first powered-up.

Transmitter channels
D851 Ch1 Output
 This indicates the result from Transmitter Input Channel 1.
See "Optional change: transmitter input channel settings (advanced users)” on page 43
for how this value is calculated.
D852 Ch2 Output
 This indicates the result from Transmitter Input Channel 2.
See "Optional change: transmitter input channel settings (advanced users)” on page 43
for how this value is calculated.

Pump efficiency
D861 Pump effy RL1
 This shows the pump efficiency percentage for relay RL1.
See also "Pump Efficiency alarm (Mobrey MCU901 and MCU902 only)” on page 89.

D862 to D864 indicate the pump efficiencies for the relays RL2, RL3, and RL4. Note that this
pump efficiency calculation is not available for relay RL5.

5.3.8 Model code, serial number, and software and hardware

revisions
The factory-set values of the following parameters may be requested from you if you
ever contact Rosemount Measurement. for help with this product. They can’t be edited.

Menu: SETUP / [CONTROLLER /] SYSTEM / FIXED

D750 Model Code
 This is the full model number of your MCU900 Series control unit.
D751 Serial No (serial number)
 This is the unique serial number of the MCU900 Series control unit.
D752 H/W Revision
 This is the revision number of the particular build of your MCU900 Series control unit.
D753 S/W Revision
 This is the revision number of the software release that is running on the MCU900
Series control unit.

116 Section 5: Servicing and Health Checks

Reference Manual Appendix A: Reference Data
IP2030/RM, Rev AA June 2014

Appendix A Reference Data

Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .page 117

Dimensional drawings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .page 121
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . page 122

A.1 Specifications
A.1.1 General
Product
 MCU900 Series Universal Control Units:
MCU901 Standard Control Unit
MCU902 Differential Control Unit
MCU90F Logging Control Unit

Mounting styles
 Wall or panel mount

Power options
 AC mains or DC

A.1.2 Display
Type
 Dot matrix LCD, 32 x 122 pixels, back lit

Location
 Integrated into enclosure

Indicators
 Red LED for health status

A.1.3 Electrical
AC mains power supply input
 115 or 230 Vac ±10% (switch selectable)
 Power consumption: 10 VA nominal, 18 VA maximum
 Fuse: 200 mA(T), 5 x 20 mm, 250 V

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DC power supply input

 15 to 30 Vdc, 30 Vdc maximum
 Power consumption: 9 W maximum

Current input
 4–20mA (Earth referenced in control unit) or
HART digital communications (revisions 5, 6, and 7)
 Supplies 23 volts from 400 Ohm source resistance

Trigger inputs
 2 voltage-free contact closures

Relays
 5 x SPDT, 5 A at 240 Vac

Current output
 Signal range (nominal): 4–20 mA
 Output range (linear):
 3.8 to 20.5 mA (user-selectable alarm current of 3.6 mA or 21 mA
 Load: Rmax is 1 K Ohm
 Resolution: 12-bit
 Regulation: < 0.1% over load change from 0 to 600 Ohms
 Isolation: Isolated from other terminals to 500 Vdc
 Update rate (software): 5 times per second

Cable entry
 Wall mount enclosure:
5 positions pre-drilled, 2 cable glands and 3 blanking plugs supplied
 Panel enclosure:
Direct wiring to terminal blocks at rear

Cable connection
 Wall mount enclosure:
Cage clamp terminal blocks in separate terminal compartment
 Panel mount enclosure:
2-part cage clamp terminal blocks at rear

118 Appendix A: Reference Data

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A.1.4 Mechanical
Materials of construction (wall mount)
 Polycarbonate enclosure and cover
 304SST cover fixing screws
 UV resistant Polycarbonate membrane keypad
 Nylon cable glands and blanking plugs

Materials of construction (panel mount)

 Noryl PPO enclosure and cover
 Carbon Steel / Zinc plated fascia fixing screws
 UV resistant Noryl PPO membrane keypad
 Nylon + PBT terminal blocks with plated fittings

Dimensions
 See Dimensional drawings on pages 121 to 122

Weight
 Wall mount:
1.4 kg (mains unit) or 1.0 kg (DC unit)
 Panel mount:
1.2 kg (mains unit) or 0.8 kg (DC unit)

A.1.5 Environment
Ambient temperature
 –40 to 55 °C (–40 to 131 °F)
See Appendix B: Product Certifications for approval temperatures ranges

Relative humidity
 Wall mount: 100%
 Panel mount: 90% non-condensing

Electrical safety
 EN61010-1

Ingress protection
 Wall mount: IP65 indoor/outdoor
 Panel mount: IP40 indoor mount (or IP65 if with optional hood)

Vibration
 Control Room: 0.1 to 9 Hz 1.5 mm displacement peak amplitude / 9 to 200 Hz 0.5 g

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Installation category
 Category III: Supply voltage < 127Vac (IEC60664)
 Category II: Supply voltage < 254Vac (IEC60664)

Pollution degree
 2 (IEC60664)

Maximum altitude
 2000 m

Electromagnetic compatibility
 Emissions and immunity for IP-rated wall mount and panel mount: EN61326-1:2006

Certifications
 CE-mark, ATEX, and IECEx

120 Appendix A: Reference Data

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A.2 Dimensional drawings

Figure A-1. Dimensions for the wall-mounted unit

Note: Dimensions are in inches (mm)

4. 9
2) (12
(2113) 5)
2 Lid
8 .4 (

Terminal Cover

2.3 (59)
3.3 (84)
3 (77)

0.8
(19.5)

7 .3
Body (18
5)
1.1 5 holes Ø0.8 (Ø20.5)
1.4 (28)
(36) )
(5 6
2 .2 )
(84
3 .3 1 )
(14
5 .5

0.6 0.96
(14.5) (24.5)

5.8
(147.5)

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Figure A-2. Dimensions for the panel-mounted unit

Note: Dimensions are in inches (mm)

5.7(144.8)

2.9
(74.7)

6.8 (173)

6.1 (156)

5.7(144.8)

2.6 2.9
(65.7) (72.4)

0.1 (2)

5.43 (138) 0.3 (8)

Panel cut-out For safety, the panel should be strong enough to support the
(control unit) 2.68
1.2 kg (mains power) or 0.8 kg (DC power) mass of the unit.
(68)

0.47
0.13 (11.85)
(3.2)
Panel cut-out (RS232 data download
socket on MCU90F only)
Ø0.81
(Ø20.5)

122 Appendix A: Reference Data

Reference Manual Appendix B: Product Certifications
IP2030/RM, Rev AA June 2014

Appendix B Product Certifications

Safety messages . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .page 123

European directive information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .page 124
Hazardous locations certifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . page 124

B.1 Safety messages

Procedures and instructions in this section may require special precautions to ensure the safety
of the personnel performing the operations. Information that raises potential safety issues is
indicated by a warning symbol ( ). Please refer to the following safety messages before
performing an operation preceded by this symbol.

Explosions could result in death or serious injury:

 Verify that the operating environment of the MCU900 Series control unit is consistent
with the appropriate hazardous locations certifications
Failure to follow safe installation and servicing guidelines could result in death or
serious injury:
 Make sure the MCU900 Series control unit is installed by qualified personnel and in
accordance with applicable code of practice
 Use the equipment only as specified in this manual. Failure to do so may impair the
protection provided by the equipment
 Do not perform any service other than those contained in this manual unless you are
qualified
High voltage that may be present on leads could cause electrical shock:
 Avoid contact with leads and terminals
 Make sure the main power to the MCU900 Series control unit is off

Appendix B: Product Certifications 123

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B.2 European directive information

The EC declaration of conformity for all applicable European directives for this product can
be found in the Mobrey MCU900 Series safety manual (IP2030/SI) on the Mobrey brand
pages at www.emersonprocess.com.

ATEX directive (94/9/EC)

 Emerson Process Management complies with the ATEX directive

Low voltage directive (2006/95/EC)

 The Mobrey MCU900 Series control unit complies with EN61010 Part 1

Pressure equipment directive (PED) (97/23/EC)

 The Mobrey MCU900 Series control unit is outside the scope of PED

Electro magnetic compatibility (EMC) directive (2004/108/EC)

 The Mobrey MCU900 Series control unit complies with EN61326-1: 2006

Restriction of hazardous substances (RoHS)

 The Mobrey MCU900 Series control unit is exempt

B.3 Hazardous locations certifications

Note
 The MCU900 Series is mounted in a non-hazardous area, and provides a protected
(intrinsically safe) 24 volts direct current supply to a transmitter in a hazardous area.
 See also the Mobrey MCU900 Series safety manual (document number IP2030/SI) for
ATEX and IECEx conditions for safe use.

B.3.1 ATEX intrinsically safe approval

Certificate numbers: BAS00ATEX7064 (Wall Mount), BAS01ATEX7225X (Panel Mount)
Intrinsically safe for II (1) GD, [Ex ia] IIC, [Ex ia Da] IIIC
Ambient temperature: –40 °C to +55 °C
Uo = +28 V, lo = 120 mA, Po = 0.82 W, Li = 0.2 mH, Ci = 0.6 nF

Special conditions for safe use (certificate BAS01ATEX7225X)

 Terminal 30 must be earthed in the safe area to a high integrity earth/ground point in a
non-hazardous area.

B.3.2 IECEx intrinsically safe approval

Certificate Number: IECEx SIR 06.0090X
Intrinsically safe for [Ex ia] IIC, [Ex ia Da] IIIC
Ambient temperature: –40 °C to +55 °C
Uo = +27.3 V, lo = 96.9 mA, Po = 0.66 W, Li = 0.2 mH, Ci = 0.6 nF

Special conditions for safe use

 Terminal 30 must be earthed in the safe area to a high integrity earth/ground point in a
non-hazardous area.

124 Appendix B: Product Certifications

Reference Manual Appendix C: Menus and Parameters
IP2030/RM, Rev AA June 2014

Appendix C Menus and Parameters

C.1 Menus and parameters

This chapter contains the full menu system maps for:
 Mobrey MCU900 Series control units – see Table C-1 on page 126
 Generic HART 4, 6, and 7 transmitters – see Table C-2 on page 132

Note
 If a Mobrey MSP Series transmitter is connected, refer to the reference manual on the
Mobrey brand pages at www.emersonprocess.com for full information about
programming the transmitter parameters (e.g. Transmitter Bottom Reference) using
the MCU900 Series control unit or other HART-based devices.

Appendix C: Menus and Parameters 125

 Table C-1. Mobrey MCU900 Series control unit

126
Param Factory Reference
MAIN MENU Menu Level 2 Menu Level 3 Menu Level 4 Num. Parameter Name Units Defaults Min Max Pages
Cancel password - Cancel password - - - - 105
SETUP (1) APPLICATION App Wizard - App Wizard - - - - 39
IP2030/RM, Rev AA

SIMULATION Simulation - - - - 110

Reference Manual

Description P240 Description - (Factory set) - - 103

Message P241 Message MESSAGE - - 103
Tag P242 Tag (Factory set) - - 103
DISPLAY Display Upper P570 Display Upper P731-Time - - 102
Display Middle P571 Display Middle D800-PV - - 102
Display Lower P572 Display Lower Bar graph - - 102
Decimal places P573 Decimal places 3 102
PV Units P200 PV Units - % - - 44
SV Units P201 SV Units - None - - 44
TV Units P202 TV Units - % - - 44
FV Units P203 FV Units - None - - 44
Display size P574 Display size - Large - - 102
Backlight P575 Backlight - On - - 102
OUTPUT CURRENT OUTPUT Low Range Val P400 Low Range Val as P200 0 - - 68
Up Range Val P401 Up Range Val as P200 100 - - 68
Alarm Action P402 Alarm Action - 3.6 mA - - 68
mA Source P405 mA Source - MCU PV 68
RELAY Relay Wizard - Relay Wizard - 0 - - 69
Reset RL Params Reset RL Params - - - - 70
RELAY 1 P410 Relay 1 Mode - Free - - 70
P411 Relay 1 On Point As P200 0 - - 70
P412 Relay 1 Off Point As P200 0 - - 70
P413 Relay 1 Minimum On Time mmm:ss 000:00 - - 70
P414 Relay 1 Maximum On Time mmm:ss 000:00 - - 70
P415 Relay 1 Minimum Off Time mmm:ss 000:00 - - 70
RELAY 2 P420 Relay 2 Mode - None - - 70
P421 Relay 2 ON Point As P200 0 - - 70
P422 Relay 2 OFF Point As P200 0 - - 70
P423 Relay 2 Minimum On Time mmm:ss 000:00 - - 70
P424 Relay 2 Maximum On Time mmm:ss 000:00 - - 70
P425 Relay 2 Minimum Off Time mmm:ss 000:00 - - 70
RELAY 3 P430 Relay 3 Mode - None - - 70
P431 Relay 3 ON Point As P200 0 - - 70
P432 Relay 3 OFF Point As P200 0 - - 70
P433 Relay 3 Minimum On Time mmm:ss 000:00 - - 70
P434 Relay 3 Maximum On Time mmm:ss 000:00 - - 70
P435 Relay 3 Minimum Off Time mmm:ss 000:00 - - 70

Appendix C: Menus and Parameters

June 2014
Appendix C: Menus and Parameters
 Param Factory Reference
MAIN MENU Menu Level 2 Menu Level 3 Menu Level 4 Num. Parameter Name Units Defaults Min Max Pages
June 2014

(SETUP) (OUTPUT) (RELAY) RELAY 4 P440 Relay 4 Mode - None - - 70

P441 Relay 4 ON Point As P200 0 - - 70
P442 Relay 4 OFF Point As P200 0 - - 70
P443 Relay 4 Minimum On Time mmm:ss 000:00 - - 70
P444 Relay 4 Maximum On Time mmm:ss 000:00 - - 70
P445 Relay 4 Minimum Off Time mmm:ss 000:00 - - 70
RELAY 5 P450 Relay 5 Mode - None - - 70
P451 Relay 5 ON Point As P200 0 - - 70

Appendix C: Menus and Parameters

P452 Relay 5 OFF Point As P200 0 - - 70
P453 Relay 5 Minimum On Time mmm:ss 000:00 - - 70
P454 Relay 5 Maximum On Time mmm:ss 000:00 - - 70
Section C: Menus and Parameters

P455 Relay 5 Minimum Off Time mmm:ss 000:00 - - 70

ALARM P490 Rising level alarm delay mmm:ss 000:00 - - 89
P491 Relay operations alarm limit - 0 - - 88
P492 Relay operations relay select - Disabled - - 88
P493 Relay runtime alarm limit hh:mm 00:00 - - 88
P494 Relay runtime relay select - Disabled - - 89
P495 (2) Pump efficiency limit - 0 - - 89
P496 (2) Pump efficiency relay select - 0 - - 89
P497 No activity delay hh:mm 00:00 - - 88
P498 No activity relay hh:mm 00:00 - - 88
OVERRIDES P499 Pump On Delay s 3 0 9 84
P270 (3) Auto Sequence Enable - Off - - 84
P271 (3) Auto Sequence Qualifier - 0 - - 84
P272 (3) Pump-down Relay - 0 - - 86
P273 (3) Pump-down Interval hh.mm 00:00 - - 86
P274 (3) Pump-down Duration hh.mm 00:00 - - 86
P275 Energy Saving Start Time hh.mm 00:00 - - 85
P276 Energy Saving Relay Select - 0 - - 85
P277 (3) Scum Line Prevention variance - 0 - - 85
P278 (3) Scum Line Prevention relay - 0 - - 85
CUSTOM P250 Start On - None 0 4 86
P251 Stop On - None 0 3 86
P252 Stop If - None 0 253 86
P253 Start Time hh.mm 07:00 - - 86
P254 Interval hh.mm 01:00 - - 86
P255 Start Time #2 hh.mm 00:00 - - 86
P256 Interval #2 hh:mm 00:00 - - 86
P257 Max Retries - 10 0 250 86, 91

127
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 Param Factory Reference

128
MAIN MENU Menu Level 2 Menu Level 3 Menu Level 4 Num. Parameter Name Units Defaults Min Max Pages
(SETUP) (OUTPUT) TOTALIZER (4) Totalizer Wizard Totalizer Wizard - 0 - - 95, 97, 99
Total [1] Factor P530 Totalizer [1] Factor - 0 0 - 95, 97, 99
Total [1] Units P531 Totalizer [1] Units - 0 0 - 95, 97, 99
IP2030/RM, Rev AA

Total 2 Factor P532 Totalizer 2 Factor - 0 0 - 97

Total 2 Units P533 Totalizer 2 Units - 0 0 - 97
Reference Manual

Total 2 Source P536 Totalizer 2 Source - 0 - - 97

Pulse Width P534 Pulse Width ms 100 10 2500 95, 97, 99
Sample Factor P535 Sampler Factor - 0 0 - 95, 97, 99
Total 2 dec pl P537 (5) Total 2 decimal places - 1 - - 97
PV DAMPING MCU PV Damping P210 MCU PV Damping s 0 - - 44
ALARM PV over Limits P540 PV Over Limits - None - - 91
mA Out Sat P541 Current Output Saturated - None - - 91
Memory Filling P542 Memory Filling (6) - None - - 91
Digital Input P543 Digital Input - None - - 91
Max Retries P544 Maximum number of retries - None - - 91
mA In Sat P545 Current Input Saturated - None - - 91
Rising Level P547 Rising Level - None - - 91
RELAY P548 Relay operations - None - - 91
P549 Relay runtime - None - - 91
P550 Pump efficiency - None - - 91
P551 No activity - None - - 91
FAULT System Fault P560 System Fault - Both - - 82
CU Temp Fault P561 Control Unit Temperature Fault - None - - 82
Xmtr Fault P562 Transmitter Fault - Both - - 82
Digital Input P563 Digital Input - None - - 82
LOGGING (6) Logging Wizard - 0 - - 66
P590 Logging Interval min 0 0 99 64
P591 Fast logging select mode as P200 0 (=Off) 0 - 64
P592 Do/Do not overwrite old data - On - - 64
P593 Low memory alarm threshold % 0 0 99 64
INPUT CHANNEL Ch1 I/P Source P111 Ch1 I/P Source Tx1 : PV - - 44, 48
(MCU901/MCU Ch1 I/P Offset P112 Channel 1 Input Offset - 0 - - 44, 48
90F) Ch1 Profile P113 Channel 1 Profile - Scaled - - 44, 48
Ch1 Pre Scale P114 Channel 1 Input Scale Factor - 1 - - 44, 48
Ch1 NLP Data P115 Channel 1 Non-Linear Data - 0 - - 44, 48
Ch1 Post Scale P116 Channel 1 Post Scale - 1 - - 44, 48
Ch1 Low Cut-off P117 Channel 1 Low Cut-off as P201 None - - 44, 48
Cur I/P Damping P321 Current Input 1 Damping sec 5 0 99.9 44, 48

Appendix C: Menus and Parameters

June 2014
Appendix C: Menus and Parameters
 Param Factory Reference
MAIN MENU Menu Level 2 Menu Level 3 Menu Level 4 Num. Parameter Name Units Defaults Min Max Pages
June 2014

(SETUP) PV CHANNEL 1 Ch1 I/P Source P111 Channel 1 Input Source Tx1 : PV - - 44, 48
CALCULATION Ch1 I/P Offset P112 Channel 1 Input Offset - 0 - - 44, 48
(MCU902) Ch1 Profile P113 Channel 1 Profile - Scaled - - 44, 48
Ch1 Pre Scale P114 Channel 1 Input Scale Factor - 1 - - 44, 48
Ch1 NLP Data P115 Channel 1 Non-Linear Data - 0 - - 44, 48
Ch1 Post Scale P116 Channel 1 Post Scale - 1 - - 44, 48
Ch1 Low Cut-off P117 Channel 1 Low Cut-off as P201 None - - 44, 48
CHANNEL 2 Ch2 I/P Source P121 Channel 2 Input Source Tx2 : PV - - 50

Appendix C: Menus and Parameters

Ch2 I/P Offset P122 Channel 2 Input Offset - 0 - - 50
Ch2 Profile P123 Channel 2 Profile - Scaled - - 50
Ch2 Pre Scale P124 Channel 2 Input Scale Factor - 1 - - 50
Section C: Menus and Parameters

Ch2 NLP Data P125 Channel 2 Non-Linear Data - 0 - - 50

Ch2 Post Scale P126 Channel 2 Post Scale - 1 - - 50
Ch2 Low Cut-off P127 Channel 2 Low Cut-off as P202 None - - 50
Output Mapping P150 Output Mapping - Ch1 - - 50
MCU FV Source P151 MCU Fourth Variable Source - Tx1: FV - - 50
Cur I/P Damping P321 Current Input 1 Damping sec 5 0 99.9 44, 48
DIGITAL INPUT DIGITAL INPUT 1 Dig In1 Action P340 Digital Input 1 Action - Free - - 61
Dig In1 Delay P341 Digital Input 1 Delay mmm.ss 000:00 - - 61
Dig In1 Active P342 Digital Input 1 Active - Closed - - 61
DIGITAL INPUT 2 Dig In2 Action P345 Digital Input 2 Action - Free - - 61
Dig In2 Delay P346 Digital Input 2 Delay mmm:ss 000:00 - - 61
Dig In2 Active P347 Digital Input 2 Active - Closed - - 61
SYSTEM TEST DISPLAY Display Test - - - - 110
CURRENT INPUT 4mA input adjust - - - - 111
20mA input adjust - - - - 111
CURRENT OUTPUT P700 4mA output adjust - - - - 112
P701 20mA output adjust - - - - 112
P702 Set Current mA 0 - - 111
SETTINGS Date P730 Date - (Factory set) - - 42
Time P731 Time - - - - 42
Date Format P734 Date format - dd/mm/yy - - 42
Keypad Sound P735 Keypad sound on/off - Off - - 42
Language P737 Language - English - - 42
PIN P740 PIN - 0 105
DEFAULTS - LOAD FACTORY DEFAULTS - - - - 135
Transmitter Wizard - Transmitter Wizard - - - -

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 Param Factory Reference

130
MAIN MENU Menu Level 2 Menu Level 3 Menu Level 4 Num. Parameter Name Units Defaults Min Max Pages
(SETUP) (SYSTEM) COMMUNICATIONS Address P710 Comms address of control unit - 0 0 15 104
Interface P711 Interface type - See (7) - - 104
Baud Rate P712 Baud rate - See (8) - - 104
IP2030/RM, Rev AA

Start Bits P713 Number of start bits - 1 1 2 104

Data Bits P714 Number of data bits - 8 7 8 104
Reference Manual

Parity P715 Parity of data - Odd - - 104

Stop Bits P716 Number of stop bits - 1 1 2 104
FIXED Model Code D750 Model code - (Factory set) - - 116
Serial No D751 Serial Number - Control Unit - (Factory set) - - 116
H/W Revision D752 Hardware Revision - (Factory set) - - 116
S/W Revision D753 Software Version - (Factory set) - - 116
HART D760 Manufacturer’s Code - (Factory set) - - 116
D761 Unique ID - (Factory set) - - -
D762 Universal command revision - 5 - - -
D763 Txr spec. command revision - 2 - - -
D764 Pre-amble bytes - 5 - - -
D765 Flags - 1 - - -
Run App? / Program? - Run App? / Program? - - - - 38
MONITOR (1) READINGS ANSWERS PV D800 Primary / Process Variable As P200 - - - 43 - 50, 112
SV D801 Secondary Variable As P201 - - - 43 - 50, 112
TV D802 Tertiary Variable As P202 - - - 43 - 50, 112
FV D803 Fourth Variable As P203 - - - 43 - 50, 112
Ullage D804 Ullage As P200 - - - 112
% Current Out D805 % Current Output % - - - 112
Current O/P D806 Current Output mA - - - 112
Rate of Change D809 Rate of PV change PV/min - - - 83, 90, 113
RELAY RELAY D811 Relay 1 Operations Counter - 0 - - 88, 113
OPERATIONS D812 Relay 2 Operations Counter - 0 - - 88, 113
D813 Relay 3 Operations Counter - 0 - - 88, 113
D814 Relay 4 Operations Counter - 0 - - 88, 113
D815 Relay 5 Operations Counter - 0 - - 88, 113
Relay Status D820 Relay Status - - - - 113
RELAY RUN TIME D821 Relay 1 run-time hh:mm - - - 88, 113
D822 Relay 2 run-time hh:mm - - - 88, 113
D823 Relay 3 run-time hh:mm - - - 88, 113
D824 Relay 4 run-time hh:mm - - - 88, 113
D825 Relay 5 run-time hh:mm - - - 88, 113
Totalizer D828 Totalizer 1 value (4) As P531 - 0 - 95, 114
D829 Totalizer 2 value (4) As P533 - 0 - 95, 114
Alarm Report D830 Alarm Report - None - - 91, 114
Fault Report D831 Fault Report - None - - 82, 114

Appendix C: Menus and Parameters

June 2014
Appendix C: Menus and Parameters
 Param Factory Reference
MAIN MENU Menu Level 2 Menu Level 3 Menu Level 4 Num. Parameter Name Units Defaults Min Max Pages
June 2014

(MONITOR) DIAGNOSTICS I/P Status D835 Digital Input status - - - - 61, 115
Current I/P D840 Current Input mA - - - 43, 115
mA Input % D842 Current Input % % - - - 43, 115
CU Temperature D844 Temperature of Control Unit C - - - 82, 115
Next Pump down D845 Time to next pump-down hh:mm - - - 85, 115
Free memory D846 Logging memory free (6) % - - - 64, 115
Date of Change D848 Date of last change ddmmyy --/--/-- - - 115
1st Pwr Date D849 Data of 1st power-on ddmmyy --/--/-- - - 116

Appendix C: Menus and Parameters

CHANNELS (9) Ch1 Output D851 Channel 1 Output As P201 - - - 44, 48, 116
Ch2 Output D852 Channel 2 Output As P202 - - - 50,116
PUMP Pump effy RL1 D861 Pump efficiency RL1 % - - - 89, 116
Section C: Menus and Parameters

EFFICIENCY (2) (10) Pump effy RL2 D862 Pump efficiency RL2 % - - - 89, 116
Pump effy RL3 D863 Pump efficiency RL3 % - - - 89, 116
Pump effy RL4 D864 Pump efficiency RL4 % - - - 89, 116
ADVANCED Pxx - - - - - - 136
Dxx - - - - - - 136
(1) Selecting SETUP menu presents a SELECT INSTRUMENT screen if a HART transmitter is assigned to a Current Input channel. Select CONTROL UNIT tag to see Menu Level 2 options.
(2) The pump efficiency calculation is available on the Mobrey MCU901 and MCU902 - see “Pump Efficiency alarm (Mobrey MCU901 and MCU902 only)” on page 89.
(3) Relay override features are available on the Mobrey MCU901 and MCU902 - see “Set-up the relays” on page 69.
(4) There is one totalizer on the Mobrey MCU901. There are two totalizers on the Mobrey MCU902 and MCU90F.
(5) The “Totalizer 2” display option is available on the Mobrey MCU90F only - see “Set-up totalizing on the Mobrey MCU90F control unit” on page 99.
(6) Data logging is available on the Mobrey MCU90F only - see “Data logging on the Mobrey MCU90F” on page 64.
(7) Factory default is “Log download” on the Mobrey MCU90F and is “RS232 HART” on the Mobrey MCU901 and MCU902.
(8) Factory default is “1200” for the Mobrey MCU90F, and “9600” for the Mobrey MCU901 and MCU902.
(9) The second channel output is on the Mobrey MCU902 only.
(10) Relay 5 does not support the pump efficiency calculation.

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 Table C-2. Generic HART 5, 6, and 7 transmitters

132
Param
MAIN MENU Menu Level 2 Menu Level 3 Menu Level 4 Menu Level 5 Num. Parameter Name HART 5 HART 6 HART 7
SETUP DUTY IDENTITY Message P000 Message Yes Yes Yes
Tag P001 Tag Yes Yes Yes
IP2030/RM, Rev AA

Descriptor P002 Descriptor Yes Yes Yes

Long Tag P091 Long Tag(1) – Yes Yes
Reference Manual

SET PV ZERO – SET PV ZERO – Yes Yes

Transfer Function P019 Transfer Function – Yes Yes
UNITS P012 PV Units Yes Yes Yes
OUTPUT VARIABLE PV Assignment P006 PV Assignment – Yes Yes
ASSIGNMENT SV Assignment P007 SV Assignment – Yes Yes
TV Assignment P008 TV Assignment – Yes Yes
QV Assignment P009 QV Assignment – Yes Yes
CURRENT Upper Range Value P015 Upper Range Value Yes Yes Yes
Lower Range Value P016 Lower Range Value Yes Yes Yes
Loop Current Active P017 Loop Current Active – Yes Yes
Damping P020 Damping Yes Yes Yes
Range Value Units – Range Value Units – Yes Yes
SYSTEM TRIM Fix Current Output – Fix Current Output Yes Yes Yes
Trim 4 mA – Trim 4 mA Yes Yes Yes
Trim 20 mA – Trim 20 mA Yes Yes Yes
TEST Simulate PV P098 Simulate PV – Yes Yes
Locate Dev P099 Locate Device (Squawk) – Yes Yes
DATE/TIME Present Date P051 Present Date – – Yes
Present Time P052 Present Time – – Yes
RESET RESTART – RESTART – Yes Yes
MASTER R. – MASTER R. Yes Yes Yes
FLUSH DR – FLUSH DR – Yes Yes
BURST CANCEL BURST 0 – CANCEL BURST 0 – Yes Yes
CANCEL BURST 1 – CANCEL BURST 1 – – Yes
CANCEL BURST 2 – CANCEL BURST 2 – – Yes
SECURITY Write Protect Code D978 Write Protect Code – Yes Yes
Lock Status D979 Lock Status – Yes Yes
UNLOCK DEVICE – UNLOCK DEVICE – Yes Yes
FIXED Final Assy Number P004 Final Assy Number Yes Yes Yes
Xducer Serial Numbr P005 Xducer Serial Number Yes Yes Yes
Hardware Revision D952 Hardware Revision Yes Yes Yes
HART D950 HART Device Type – Yes Yes
D951 Poll Address Yes Yes Yes
D953 Software Revision Yes Yes Yes
D960 Manufacturer – Yes Yes
D961 Device ID Yes Yes Yes

Appendix C: Menus and Parameters

June 2014
Appendix C: Menus and Parameters
 Param
MAIN MENU Menu Level 2 Menu Level 3 Menu Level 4 Menu Level 5 Num. Parameter Name HART 5 HART 6 HART 7
June 2014

(SETUP) (DUTY) (SYSTEM) (FIXED) (HART) D962 HART Revision Yes Yes Yes
D963 Device Revision Yes Yes Yes
D964 Request Preambles – Yes Yes
D966 Response Preambles – Yes Yes
D967 Max Number of Dev Variables – Yes Yes
MONITOR READINGS VARIABLES Primary Variable D900 Primary Variable Yes Yes Yes
Secondary Variable D901 Secondary Variable Yes Yes Yes
Tertiary Variable D902 Tertiary Variable Yes Yes Yes

Appendix C: Menus and Parameters

Quaternery Variable D903 Quaternery Variable Yes Yes Yes
CURRENT Current Output D906 Current Output Yes Yes Yes
% Current Output D905 % Current Output Yes Yes Yes
Section C: Menus and Parameters

DIAGNOSTICS HISTORY Date P003 Date Yes Yes Yes

Conf. Change Counter P968 Conf. Change Counter – Yes Yes
STATUS DEV SPEC 1 Field Device Status D981 Field Device Status – Yes Yes
Additional Status 0 D982 Additional Status 0 – Yes Yes
Additional Status 1 D983 Additional Status 1 – Yes Yes
Additional Status 2 D984 Additional Status 2 – Yes Yes
Additional Status 3 D985 Additional Status 3 – Yes Yes
Additional Status 4 D986 Additional Status 4 – Yes Yes
Additional Status 5 D987 Additional Status 5 – Yes Yes
STANDARD Extended Dev Status D988 Extended Dev Status – Yes Yes
Device Op Mode D989 Device Op Mode – Yes Yes
Standard Status 0 D990 Standard Status 0 – Yes Yes
Standard Status 1 D991 Standard Status 1 – Yes Yes
Analog Chan Sat. D992 Analog Chan Sat. – Yes Yes
Standard Status 2 D993 Standard Status 2 – Yes Yes
Standard Status 3 D994 Standard Status 3 – Yes Yes
Analog Chan Fixed D995 Analog Chan Fixed – Yes Yes
DEV SPEC 2 Additional Stat 14 D996 Additional Stat 14 – Yes Yes
Additional Stat 15 D997 Additional Stat 15 – Yes Yes
Additional Stat 16 D998 Additional Stat 16 – Yes Yes
Additional Stat 17 D999 Additional Stat 17 – Yes Yes
TRANSDUCER Upper Xducer Limit D941 Upper Xducer Limit – Yes Yes
Lower Xducer Limit D942 Lower Xducer Limit – Yes Yes
Xducer Min Span D943 Xducer Min Span – Yes Yes
COMMS STATS STX Count D969 STX Count – – Yes
ACK Count D970 ACK Count – – Yes
(1) The control unit LCD supports the viewing and editing of up to 16 characters.

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Appendix C: Menus and Parameters Reference Manual
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134 Appendix C: Menus and Parameters

Reference Manual Appendix D: Additional Features
IP2030/RM, Rev AA June 2014

Appendix D Additional Features

Restoring the factory defaults . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .page 135

ADVANCED parameter access . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . page 136

D.1 Restoring the factory defaults

D.1.1 How to restore the factory default settings
Note
 The factory defaults may not be the same as the settings when shipped from the
factory. It is advisable to keep a record of settings, if possible.

Procedure to restore the control unit to the factory defaults,

erasing all user-entered data
1. If there are HART transmitters connected:
a. Navigate to SETUP / [CONTROLLER /] SYSTEM / Transmitter Wizard
b. Start the Wizard, and use the Remove option for each connected transmitter.
This removal action clears the control unit memory of all transmitter data that has been
uploaded from a HART transmitter, including the Transmitter Bottom Reference.

2. Navigate to the SETUP / [CONTROLLER /] SYSTEM / DEFAULTS menu (see Figure 8).

3. Press the red (ENTER) button twice and then wait until “Done”.

4. Switch off

5. If there are two transmitters connected to a Mobrey MCU902 control unit:

a. Switch-off power to the MCU900 Series control unit.
b. Remove the second transmitter that is associated with Transmitter Input Channel 2.
c. Switch-on power to the MCU900 Series control unit

6. Put the control unit into Run App mode (to automatically find a HART transmitter)

7. If the control unit is a Mobrey MCU902 control unit:

a. Switch-off power to the MCU900 Series control unit.
b. Re-connect the second transmitter.
c. Switch-on power to the MCU900 Series control unit

8. Turn back to Section 4: Getting started, to start again.

Appendix D: Additional Features 135

Appendix D: Additional Features Reference Manual
June 2014 IP2030/RM, Rev AA

D.2 ADVANCED parameter access

The ADVANCED parameter access is selected from the MAIN MENU (see Figure D-1).

It provides a quick and direct access to parameter screens without traversing the menu system.
All that is required is the entry of the unique 3-digit identification (ID) number for a parameter.
Appendix C: Menus and Parameters has a list of all parameters and their identification numbers.

Figure D-1. Navigating to the ADVANCED menu

x3
MAIN MENU
Run App?
MONITOR
ADVANCED ADVANCED
Pxxx
Dxxx

Both 'P' and 'D' prefixed parameters can be accessed through separate selection screens.
After entering the ADVANCED menu, select Pxxx or Dxxx (see Figure D-2).

Next, input a valid identification number using the arrow buttons (010 is the default) and press
the red (ENTER) button to confirm and make that parameter screen appear (see Figure D-3).
When an input parameter number is not valid, the nearest valid parameter is displayed instead
(see Figure D-4 on page 137).

Pressing the Esc button allows a new number to be input to access another parameter.
This is very convenient when checking on more than one parameter.

Figure D-2. Pxxx or Dxxx selection

ADVANCED
Pxxx
Dxxx
ADVANCED
P110
0

Figure D-3. Pxxx editing example with valid parameter number

x2
ADVANCED (Edits 010 to be 200)
P110
0

ADVANCED
P200
0

PV Units P200
%
ESC=Quit =Edit

136 Appendix D: Additional Features

Reference Manual Appendix D: Additional Features
IP2030/RM, Rev AA June 2014

Figure D-4. Pxxx editing with no valid parameter number

x2
ADVANCED (Edits 010 to be 215)
P110
0

ADVANCED
P210
5

MCU PV Damping P210

0s
ESC=Quit =Edit

While displaying a parameter, after using this direct feature, the UP-ARROW or DOWN-ARROW
buttons can scroll through adjacent parameters (see Figure D-5).

Figure D-5. How to scroll through adjacent parameters

ADVANCED
0
P200

PV Units P200
%
ESC=Quit =Edit
SV Units P201
%
ESC=Quit =Edit
PV Units P200
%
ESC=Quit =Edit

Use the Esc button to return to the Pxxx or Dxxx selection screen. To exit to the MAIN MENU,
press the Esc button repeatedly (see Figure D-6).

Figure D-6. How to return to the menu system

Esc
PV Units P200
%
ESC=Quit =Edit ADVANCED Esc

P200
0

ADVANCED Esc
Pxxx
Dxxx
MAIN MENU
Run App?
MONITOR
ADVANCED

Appendix D: Additional Features 137

Appendix D: Additional Features Reference Manual
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138 Appendix D: Additional Features

Reference Manual Appendix E: Support for HART® Transmitters
IP2030/RM, Rev AA June 2014

Appendix E Support for HART® Transmitters

E.1 Overview
The Mobrey MCU900 Series control unit is able to accept digital data from any HART 5/6/7
compatible transmitter. However, the control unit is not Device Descriptor (DD) based and only
fully supports transmitters that have been factory programmed into the on-board library.

E.2 Fully supported HART transmitters

Fully supported HART transmitters, where all parameters of the transmitter are accessible for
reading and writing by the MCU900 Series control unit:
 Mobrey MSP400RH level transmitter (HART 5)
 Mobrey MSP900GH level transmitter (HART 5)
 Mobrey MSP900SH level transmitter (HART 5)
 Mobrey MSP900FH flow transmitter (HART 5)

Note
 If a Mobrey MSP Series transmitter is connected, refer to the reference manual on the
Mobrey brand pages at www.emersonprocess.com for full information about
programming the transmitter parameters (e.g. Transmitter Bottom Reference) using
the MCU900 Series control unit or other HART-based devices.

E.3 Generic support for HART transmitters

E.3.1 Compatibility between transmitter and control unit
The MCU900 Series control unit is designed to provide an intrinsically safe power supply to
power a I.S approved transmitter that is field-mounted in a hazardous area. The control unit
provides a nominal 24 Vdc supply.

Communication with the transmitter is HART, provided the transmitter current output is
configured in a passive mode to enable the control unit to power the current loop.

The addition of components (both resistive and semiconductor) as part of the I.S certification
and HART communication result in the terminal voltage varying with load current. Increasing
the load current in the loop results in a decrease in the terminal output voltage of the control
unit. Most HART transmitters require a minimum input voltage to work correctly, and for HART
communication to function. For example, a Mobrey MSP900GH Ultrasonic Level Transmitter can
operate over a voltage range of 12 to 40 Vdc (12 to 30 Vdc for intrinsically safe installations).
Consideration must be given to the loop resistance of the cable connecting the transmitter to
the controller to ensure sufficient input voltage is available at the transmitter.

Care must be taken in checking compatibility of the control unit when selecting the required
HART transmitter. Ensure that the input voltage requirements of the transmitter and the loop
resistance are below the limits given in Table E-1 on page 140.

Appendix E: Support for HART Transmitters 139

Appendix E: Support for HART® Transmitters Reference Manual
June 2014 IP2030/RM, Rev AA

Some Explosion-proof (Exd) rated transmitters have a high input voltage requirement which can
result in HART communication failing to function at high loop currents. For example, the
Explosion-proof version of the Rosemount 5400 Series transmitter has a minimum input voltage
requirement as follows:
 15.5 Vdc at 21.75 mA
 20 Vdc at 3.75 mA

The Exd version of Rosemount 5400 Series transmitter would not be suitable for use with the
MCU900 Series control unit.

Table E-1 shows the minimum MCU900 terminal output voltage (worst case conditions) for
varying load conditions.

Table E-1. Minimum terminal output voltages from control unit

Load MCU900 Maximum

current terminal loop
mA voltage Vdc resistance ohms
3.6 21.0 2370 Minimum fault current
4.0 20.8 2195 Normal minimum output
20.0 13.9 95 Normal maximum output
21 13.6 50 Maximum o/p fault level

E.3.2 Universal and common practice commands

Support for the Universal and Common Practice commands of all other HART 5/6/7
transmitters is provided in accordance with HART practice.

Table C-2 on page 132 shows the menu structure and parameters for generic HART 5/6/7
transmitters parameters as seen on a MCU900 Series control unit or other HART-based devices.

Universal commands
 #0 Read unique identifier.
 #1 Read primary variable.
 #2 Read loop current and percent of range.
 #3 Read dynamic variables and loop current.
 #6 Write polling address.
 #7 Read loop configuration.
 #12 Read message.
 #13 Read tag, descriptor, date.
 #14 Read primary variable transducer information.
 #15 Read device information.
 #16 Read final assembly number.
 #17 Write message.

140 Appendix E: Support for HART Transmitters

Reference Manual Appendix E: Support for HART® Transmitters
IP2030/RM, Rev AA June 2014

 #18 Write tag, descriptor, date.

 #19 Write final assembly number.
 #20 Read long tag.
 #22 Write long tag.
 #31 Indicates extended command number in data field.
 #38 Reset configuration changed flag.
 #48 Read additional device status.

Common practice commands

 #33 Read device variables.
 #34 Write primary variable damping value.
 #35 Write primary variable range values.
 #36 Set primary variable upper range value.
 #37 Set primary variable lower range value.
 #40 Enter/exit fixed current mode.
 #41 Perform self test.
 #42 Perform device reset.
 #43 Set primary variable zero.
 #44 Write primary variable units.
 #45 Trim loop current zero.
 #46 Trim loop current gain.
 #47 Write primary variable transfer function.
 #50 Read dynamic variable assignments.
 #51 Write dynamic variable assignments.
 #59 Write number of response preambles.
 #71 Lock device.
 #72 Squawk.
 #76 Read lock device status.
 #79 Write device variable.
 #89 Set real-time clock.
 #90 Read real-tine clock.
 #95 Read device communication statistics.
 #107 Flush delayed responses.
 #109 Burst mode control.

Appendix E: Support for HART Transmitters 141

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142 Appendix E: Support for HART Transmitters

Reference Manual Index
IP2030/RM, Rev AA June 2014

Index
Numerics Current Output. . . . 4, 14, 15, 20, 38, 40, 58, 68, 87 - 91,
20 mA input calibration. . . . . . . . . . . . . . . . . . . . . . . . . . 111 . . . . . . . . . . . . . . . . . . . . 94, 103, 110 - 113, 118, 126 - 130
20 mA output calibration . . . . . . . . . . . . . . . . . . . . . . . . 112 Customer support . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2
4 mA input calibration . . . . . . . . . . . . . . . . . . . . . . . . . . . 111
4 mA output calibration . . . . . . . . . . . . . . . . . . . . . . . . . 112
4–20 mA transmitter . . . . . . . . . . . . 26, 29, 37, 43, 44, 52
D
Damping the control unit PV . . . . . . . . . . 46 - 51, 69, 128
Damping the current input /
A transmitter input . . . . . . . . . . . . . . . . . . . . 44, 47, 128, 129
Actual current input. . . . . . . . . . . . . . . . . . . . . . . . . . . . . 103 Data logging (Mobrey MCU90F) . . . 38, 63 - 66, 94, 103,
Actual output current . . . . . . . . . . . . . . . . . . . . . . . . . . . 103 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 115, 117, 128, 131
ADC error . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 94 Decimal places . . . . . . . . . . . . . . . . . . . . . . . . . . . . 102, 128
Advanced access feature. . . . . . . . . . . . . . . . . . . . . . . . . . 32 Diagnostics and fault-finding . . . . . . . . . . . . . . . . .38, 115
Aggressive substances . . . . . . . . . . . . . . . . . . . . . . . . . . . 10 Digital trigger inputs . . . . . . . . . . . . . .4 - 7, 14, 15, 37, 73,
Alarm actions selection . . . . . . . . . . . . . . . . . . . . . . . . . . . 68 . . . . . . . . . . . . . . . . . . . . . . . . . . . . 83 - 87, 91- 94, 128 - 131
Alarm conditions . . . . . . . . . . . . . . . . . . . . . . . . . 63, 64, 91 Dimensions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 121, 122
Alarm mode relay . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7, 70 Display icons . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
Analog measurements . . . . . . . . . . . . . . . . . . . . . . . . . . . 44 Display Test function. . . . . . . . . . . . . . . . . . . . . . . . . . . . 110
Application Wizard (App Wizard) .32, 37, 39, 43, 44, 48, Duty Assist mode relay . . . . . . . . . . . . . 39, 72 - 76, 84 - 90
. . . . . . . . . . . . . . . . 55, 56, 58, 59, 61, 95, 97, 99, 126 Duty Standby mode relay. .72, 73, 78, 80, 84, 86, 89, 90
ATEX . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 124
E
B Editing a parameter setting . . . . . . . . . . . . . . . . . . . . . . . 32
Back light . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 102 EEPROM
Bar graph . . . . . . . . . . . . . . . . . . . . . . . . . . 7, 102, 103, 126 checksum error . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 94
Blanking / Stopping plugs . . . . . . . . . . . . . . . . 14, 118, 119 signature error . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 94
Bottom Reference . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Electrical connections . . . . . . . . . . . . . 11 - 18, 22, 23, 139
. . . . . . . . . . . 4, 19, 26 - 32, 39, 40, 85, 125, 135, 139 EMC (Electro Magnetic Compatibility). . . . . . . . . .10, 124
Equipotential earthing/grounding . . . . . . . . . . . . . . . . . 16
Exponential flow calculation . . . . . . . . . . . . . . . . . . . . . . 59
C
Cable / Conduit entries . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
Cable F
glands. . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14, 118, 119 Fail-safe Fault relay . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 69
joins . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16 Fault condition . . . . . . . . . . . . . . . 4 - 6, 63, 72, 73, 82, 83,
runs. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .13, 17 . . . . . . . . . . . . . . . . . . . . . . . . . .94, 114, 115, 128, 130, 140
Cables . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13 Field device malfunction . . . . . . . . . . . . . . . . . . . . . . . . . 94
Calculating Fixing points . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
flow rates . . . . . . . . . . . . . . . . . . . . 32, 37, 41, 45 - 52, Fixing the output current . . . . . . . . . . . . . . . . . . . . . . . . 111
. . . . . . . . . . . . . . . . . . 56 - 61, 67, 68, 83, 90, 95 - 100 Flat flumes. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 58
volumetric contents . . . . . . . . . . . . . . . . . . 45, 49- 53 Flume 3/2 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 56
Calendar Fourth Variable (FV) of control unit . . . . . . . . . . . . . . . . .
date and time . . . . . . . . . . . . . . . . . . . . . . . . . . 42, 103 . . . . . . . . . . . . . . 71 - 73, 98, 100, 103, 112, 126, 129, 130
Conical vessels . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 55 Free-form
Connecting two HART transmitters to a MCU902 . . . . 18 description parameter . . . . . . . . . . . . . . . . . . . . . . 103
Control unit message parameter . . . . . . . . . . . . . . . . . . . . . . . . 103
mass . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11, 119, 122 tag name parameter. . . . . . . . . . . . . . . . . . . . . . . . 103
PV . . . . . . . . . . . . . . . . . .4 - 8, 27, 29, 37 - 50, 58 - 80, Full PV
. . . . . . . . . . . . . . . . . . 86 - 91, 95- 103, 110 - 113, 126 Display. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
PV units . . . . . . . . . . . . . . . . . . . . . . . . .44, 58, 59, 126 Display parameters . . . . . . . . . . . . . . . . . . . . . . . . . 102
temperature out-of-limits . . . . . . . . . . . . . . . . . . . . 94 Fuse
versions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2, 3 specification . . . . . . . . . . . . . . . . . . . . . . . . . . . 117
replacement procedure . . . . . . . . . . . . . . . . 108, 109

Index 143
Index Reference Manual
June 2014 IP2030/RM, Rev AA

G M
Generic HART Transmitters . . . . . . . . . . . . . . . . . 125, 140 Manning formula . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 56
Maximum cable length . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
Menu system maps . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 125
H Menu-based parameters . . . . . . . . . . . . . . . . . . . . . . . . . 32
Hardware revision . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 116 Mobrey
HART transmitter LOG-VIEW software. . . . . . . . . . . . . . . . . . . . . . . 23, 64
Primary Variable (PV) . . . . . . . . . . . . .48, 50, 94, 103 MCU901 Standard control unit. . . . 2, 7, 43, 63, 104
Secondary Variable (SV) . . . . . . . . . . . . . . 48, 50, 103 MCU902 Differential control unit . . . . . . . . . 2, 7, 31,
Tertiary/Third Variable (TV) . . . . . . . . . . . 48, 50, 103 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 43, 63, 104
Fourth Variable (FV). . . . . . . . . . . . . . . . . . 48, 50, 103 MCU90F Logging control unit . . . . . . 2, 7, 11, 43, 63
Health status LED . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6 MSP Series transmitters . . . . 5, 19, 27, 32, 125, 139
Hi or Lo Alarm mode relay. . . . . . . . . . . . . . . . . . . . . . . . . 72 Model code . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 116
Horizontal cylinder Mounting the control unit . . . . . . . . . . . . . . . . . . . . . 10, 11
with domed ends . . . . . . . . . . . . . . . . . . . . . . . . . . . . 53 Multi-core cable . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
with flat ends . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 53

N
I NEMA 3 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
I.S. Barrier. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17 Non-linear (non-uniform) profiles . . . . . . . . . . . . . . . . . 53
IECEx approval. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 124
IN1 (digital trigger input 1). . . . . . . . . . . . . 14, 15, 21, 37,
. . . . . . . . . . . . . . . . . . . . . . . . . 63, 72, 83, 87, 115, 129 O
IN2 (digital trigger input 2). . . . . . . . . . 14, 15, 21, 37, 63, Offset adjustment . . . . . . . . . . . . . . . 45, 49, 51, 128, 129
. . . . . . . . . . . . . . . . . . . . . . . . . . . . 72, 83, 87, 115, 129 On/Off Point control relay . . . . . . . . . . . . . . . . . . . . . . . . 70
Input Out-of-limit Alarm mode relay . . . . . . . . . . . . . . . . . . . . 69
Channel 1. . . . . . . . . . . . . . . . . . . . . . . . . . . . 43, 44, 48
Channel 2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .43, 50
Intrinsically Safe . . . . . . . . . . . . . . . 10, 13, 14, 15, 16, 124 P
Intrinsically Safe earth/ground terminal . . . . . . . . . . . . 10 Padlock icon . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 38
IP20 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16 Panel cutout . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .11, 122
IP40 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11, 119 Panel screw clamps . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
Panel screw clips . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
Panel thickness. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
J Parabolic flumes. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 58
Junction box . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18 Parshall flumes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 58, 60
PED (Pressure Equipment Directive) . . . . . . . . . . . . . . 124
Poll address . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
K Power connections . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
Keypad . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6 Power supply . . . . . . . . . . . .10, 13, 14, 15, 117, 118, 139
Keypad sound on/off . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 42 Program? operating mode. . . . . . . . . . . . . . . . . . . . . . . . 38
Kindsvater Shen flow calculation. . . . . . . . . . . . . . . . . . . 59 Programming using the front panel . . . . . . . . . . . . . . . . 32
Pulse width . . . . . . . . . . . . . . . . . . 82, 96, 97, 98, 100, 128
Pumped volume totalizing. . . . . . . . . . . 71, 73, 90, 91, 99
L PV display size. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 102
Language selection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 42
Large PV Display . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
Linear (uniform) profiles . . . . . . . . . . . . . . . . . . . . . . . . . . 52 Q
Liquid ingress . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .10, 11 Quick and direct parameters access. . . . . . . . . . . . . . . 136
Logging interval . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 64 Quick tour of the menu system. . . . . . . . . . . . . . . . . . . . 30
Logging memory full . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 91
Loop-powered transmitter connections . . . . . . . . . . . . 17
Low measurement cut-off . 41, 46, 49, 51, 54, 128, 129 R
Lower Range Value. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 68 RAM test error . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 94
LVD (Low Voltage Directive) . . . . . . . . . . . . . . . . . . . . . 124 Rate of change value for PV . . . . . . . . .72, 83, 89, 90, 103
Recycling and disposal . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2

144 Index
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Relay V
operations counter . . . . . . . . . . . . . . . . . . . . . . . . . 113 Vibration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
overrides (safeguards) . . . . . . . . . . . . . . . . . . . . . . . 71 Vlarem flumes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 59, 60
run-time counters . . . . . . . . . . . . . . . . . . . . . . . . . . 113 V-Notch 5/2 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 56
status icons . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 70 Voltage
statuses . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 113 selection switch (mains unit). . . . . . . . . . . . . . . 16, 18
Wizard . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 69 supply . . . . . . . . . . . . . . . . 10, 13 - 20, 120, 139, 140
Relays . . . . . . . . . . . . . . . . 4 - 7, 14, 15, 20, 26, 37, 38, 40, Voltage-free contact . . . . . . . . . . . . . . . . . 4, 5, 20, 63, 118
. . . . . 45, 63 - 87, 103, 110, 113, 116, 126, 127, 131
Reset of relay parameters . . . . . . . . . . . . . . . . . . . . . . . . . 70
Restoring the factory defaults . . . . . . . . . . . . . . . . . . . . 135
RoHS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 124
Rom checksum error . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 94
RS232
download socket . . . . . 11, 14, 22, 23, 64, 104, 122
terminal connections . . . . . . . . . . . . . . . . . 14, 15, 23
Run App? operating mode . . . . . . . . . . . . . . . . . . . . . . . . 38

S
Sampler mode relay . . . . 7, 38, 70 - 73, 82, 96 - 100, 128
Secondary Variable (SV) of control unit . . . . . . . . . . . . .
. . . . . . . . . . . . . . .45, 71 - 73, 98 - 103, 112, 126, 130
Security PIN . . . . . . . . . . . . . . . . .38, 96, 99, 101, 105, 129
Separately-powered transmitter connections . . . . . . . 17
Serial number . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 116
Simulation (or Self-Test) function . . . . . . . . . . . . . . . . . 110
Software release number . . . . . . . . . . . . . . . . . . . . . .2, 116
Special plotted profile (20-point look-up) . . . . . . . .61, 62
Spherical vessel. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 53
Suitable precautions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
Sum, difference, or product of two HART inputs . .18, 29

T
Terminal blocks and wire sizes. . . . . . . . . . . . . . . . . . . . . 13
Terminals . . . . . . . . . . . . . . . . . . . . . . .13 - 22, 26, 104, 118
Tertiary/Third Variable (TV) of control unit . . 45, 71 - 73,
. . . . . . . . . . . . . . . . . . . . . 98, 100, 103, 112, 126, 130
Thermal stress. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .10, 11
Totalizer . . . . . . . . . . . . .7, 37, 38, 58, 63, 64, 91, 95 - 103
Totalizer mode relay . . . . . . . . 7, 70, 72, 73, 82, 96 - 100
Totalizer Wizard . . . . . . . . . . . . . . . . . . . . . . . . . . 90, 95, 97
Transmitter / Current Input terminals . . . . . . . . . . .13, 18
Transmitter input options. . . . . . . . . . . . . . . . . . . . . . . 4, 43
Two-part (plug/socket) terminal . . . . . . . . . . . . . . . . . . . 15
Tx1 (Transmitter 1) . . 7, 18, 27, 29, 31, 36, 48, 128, 129
Tx2 (Transmitter 2) . . . . . . . . . . 7, 18, 19, 31, 36, 50, 129

U
Universal and Common Practice HART commands
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5, 130, 140
Upper Range Value . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 68

Index 145
Index Reference Manual
June 2014 IP2030/RM, Rev AA

146 Index
 Reference Manual
IP2030/RM, Rev AA
June 2014

Emerson Process Management

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