Installation and Operating
Instructions
Reverse Power Monitor Relay
PAS, PAT -100/120, - 173/240, -380/480
DIN-rail mounted
Introduction
This unit monitors a single- or three-phase supply for reverse
power and trips a relay if it detects reverse power (I x cos Φ)
over a set limit. The relay output is typically used to prevent
‘motoring’ of a generator (where the generator turns the
engine), which can damage the engine.
Front panel controls allow selection of trip level, nominal
operating current and trip delay. LEDs indicate power on and
trip status.
Versions are available to suit 3-phase 3-wire L-L (PAT) and 3-
phase 4-wire L-N (PAS) systems.
These instructions contain important safety information. Please
read them thoroughly before commissioning, operating or
maintenance of the unit.
The time delay and differential trip levels help to prevent relay
Specification chatter as the monitored parameters fluctuate.
Parameter PAS/PAT- 100/120 173/240 380/480 As the relay has changeover contacts, the relay outputs can be
Voltage range PAS ph-N 57.7-69.3 100-139 220-277 inverted by wiring to the alternative terminals 15-16 or 25-26.
(Vnom) PAT ph-ph 100-120 173-240 380-480
Overload - cont. PAS 87V 174V 346V Under normal forward current conditions, the red LED will be
PAT 150V 300V 600V off and the relay will be de-energised.
- 10s max PAS 104V 209V 416V
If the reverse power (I x cos Φ) exceeds the set level, the relay
PAT 180V 360V 720V
Max. power input PAS 1.4/1 1.6/1.3 2.9/2.1 energises and the red OVER LED lights after the time delay
(VA/W) PAT 2.5/1.5 4.2/3.2 6/4 set by the trip delay control. The red LED flashes during the
Min supply voltage PAS 35V 60V 132V delay period.
(Uopen) PAT 3x60V 3x104V 3x228V When the reverse power falls below the set level plus the 1%
Weight PAS 199g 199g 203g differential, the relay de-energises and the red OVER LED
PAT 201g 204g 211g goes off.
Nominal currents Iin 2A,3A,4A,5A,8A,10A
If the monitored supply voltage falls below the minimum level
Operating frequency 45-65 Hz
Uopen, the relay de-energises and the red OVER LED goes
Monitored current range 2..100% Iin
off.
Monitored cos Φ range 0.2 inductive to 0.2 capacitive
Reverse power setpoint range 2..20% (cos Φ =1)
Differential fixed at 1%
Trip delay t Adjustable 0.5 - 20s
Relay contacts: volt-free, for 2 x changeover
general switching operations
Load capacity - a.c. 250V @ 8A, 2 kVA
Load capacity - d.c. 30V 8A
Insulation 4 kV/1 min
6
Mechanical endurance 3x10 operations at rated load
Other Data:
Dimensions - single/triple 90x105x64
2 2
Maximum conductor size 2 x 1.5 mm or 1 x 2.5 mm
Operating temperature -20 to +55 °C
Storage temperature -30 to +70 °C
Over-voltage category III
Pollution degree 2
Environmental protection IP40 for front panel
(triple module) IP20 for terminals.
Standards EN 60255-6, EN 60255-27, EN 61000-
6-2, EN 61000-6-4
Insulation Class: Ensure any external circuits connected to the
relay are provided with double or reinforced insulation.
Operation
The unit obtains its power supply from the supply being
monitored. The green LED lights to shows when this
supply is present on at least one phase.
Ref: PAS/PAT APR11-REV1 Page 1 of 2
Installation EN 61000-6-2 and -6-4. Precautions necessary to provide
The unit is intended for mounting on a standard DIN rail. Hook proper operation of this and adjacent equipment will be
the unit onto the top of the rail and press the bottom of the unit installation dependent and so the following can only be general
until it locks in place. To remove the unit from the rail, lever guidance:
down the black tabs at the bottom of the unit to release it from • Avoid routing wiring to this unit alongside cables and products
the rail. that are, or could be, a source of interference.
The unit is intended for use in a reasonably stable ambient
• To protect the product against incorrect operation or permanent
temperature within the range -20 to +55°C. Do not mount the damage, surge transients must be controlled. It is good EMC
unit where there is excessive vibration or in excessive direct practice to suppress differential surges to 2kV or less at the
sunlight. source. The unit has been designed to automatically recover from
typical transients, however in extreme circumstances it may be
necessary to temporarily disconnect the auxiliary supply for a
period of greater than 5 seconds to restore correct operation.
• Screened communication leads are recommended and may be
required. These and other connecting leads may require the fitting
of RF suppression components, such as ferrite absorbers, line
filters etc., if RF fields cause problems.
• It is good practice to install sensitive electronic instruments that
are performing critical functions in EMC enclosures that protect
against electrical interference causing a disturbance in function.
Wiring
A current transformer must be used if the measured current
may exceed 10A.
All connections are made to screw clamp terminals. Terminals
are suitable for copper wires only and will accept one stranded
0.05 - 2.5mm2 (30 - 12 AWG) stranded or solid core cables.
Terminal screws should be tightened to 0.5 Nm. Choice of
Caution: Risk of cable should meet local regulations.
Electric Shock Instrument transformers used for connection to the meter must
Warnings: be of approved type, compliant with ANSI/IEEE C57.13 / IEC
• During normal operation, voltages hazardous to life may be 60044-1 to provide isolation from measuring inputs.
present at some of the terminals of this unit. Installation and For UL approved installation, use National Electrical Code
servicing should be performed only by qualified, properly
(NEC) Class 1 wiring, rated at 600V 60°C min rating.
trained personnel abiding by local regulations. Ensure all
supplies are de-energised before attempting connection or
other procedures. Fusing
• It is recommended adjustments be made with the supplies A suitable switch or circuit breaker conforming to the relevant
de-energised, but if this is not possible, then extreme caution parts of IEC 60947-1 and IEC 60947-3 should be included in
should be exercised. the building installation. It should be positioned so as to be
• Terminals should not be user accessible after installation easy to operate, in close proximity to the equipment, and
and external installation provisions must be sufficient to clearly identified as the disconnecting device.
prevent hazards under fault conditions. This unit must be fitted with external fuses in voltage supply
• This unit is not intended to function as part of a system lines. Lines must be fused with a quick blow fuse 1A
providing the sole means of fault protection - good maximum. Choose fuses of a type and with a breaking
engineering practice dictates that any critical function be capacity appropriate to the supply and in accordance with local
protected by at least two independent and diverse means. regulations.
• The unit does not have internal fuses therefore external For UL approved installations:
fuses must be used for protection and safety under fault UL listed branch circuit fuses, suitable for the installation
conditions. voltage, shall be provided and installed in accordance with
• If this equipment is used in a manner not specified by the national installation code – 1A fast acting AC rated at the
manufacturer, protection provided by the equipment may be inputs.
impaired.
Safety Maintenance
The unit was designed in accordance with BS EN 60255-6 and In normal use, little or no maintenance is needed. Where used,
-27 – Permanently connected use, Normal condition. ensure any CT secondary circuits are short circuited prior to
Insulation category III, pollution degree 2, basic insulation for carrying out installation or maintenance of the unit. As
rated voltage. Measurement Category III. appropriate for service conditions, isolate electrical power,
inspect the unit and remove any dust or other foreign material
EMC Installation Requirements present. Periodically check all connections for freedom from
This unit has been designed to provide protection against EM corrosion and screw tightness, particularly if vibration is
(electro-magnetic) interference in line, in accordance with BS present.
All of the above information, including drawings, illustrations and graphic designs, reflects our present understanding and is to the best of our knowledge and belief correct
and reliable. Users, however, should independently evaluate the suitability of each product for the desired application. Under no circumstances does this constitute an
assurance of any particular quality or performance. Such an assurance is only provided in the context of our product specifications or explicit contractual arrangements.
Our liability for these products is set forth in our standard terms and conditions of sale.
TE connectivity (logo), TE (logo) and TE Connectivity are trademarks of the TE Connectivity Ltd. family of companies. CROMPTON is a trademark of Crompton Parkinson
Ltd. and is used by TE Connectivity Ltd. under licence. Other logos, product and company names mentioned herein may be trademarks of their respective owners.
Tyco Electronics UK Ltd.
a TE Connectivity Ltd. company
Freebournes Road, Witham, CM8 3AH
Page 2 of 2
Tel: +44 (0) 1376 509509, Fax: +44 (0) 1376 509511
www.crompton-instruments.com
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