w w w. m g e u p s .

c o m

Setup Load Load Protected

Alarms Battery
Inputs 0%
Main % KVA Load

KA2

UPS
Input load
KA1 K3N

QF1

⁄ı Í

EMERGENCY
POWER OFF

fault

CO M E T

MG E
UPS SYSTEMS

Comet 40-150kVA
Uninterruptible Power Supply

Installation and User Manual

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Downloaded from www.Manualslib.com manuals search engine
 Installation and User Manual

Comet
40 - 150kVA

Installation and User Manual

Revision History
Comet 40-150kVA UPS Installation and User Manual 86-160310-00

Revision: A00 Initial Release 03/1997

B00 ECN#: 289-91 01/1998
C00 ECN#: 290-30 07/1998
D00 ECN#: 002456 02/2002
E00 ECN#: 004466 08/2005

Copyright © 2005 MGE UPS SYSTEMS, INC.

All rights reserved. Printed in U.S.A.

MGE UPS SYSTEMS, INC.

1660 Scenic Avenue
Costa Mesa, CA 92626
(714) 557-1636

Customer Care Center:

1-800-438-7373 (Hours: 24/7)

86-160310-00 E00 i

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 Comet 40-150kVA

IMPORTANT SAFETY INSTRUCTIONS

SAVE THESE INSTRUCTIONS – This manual contains important instructions for the
Comet 40-150kVA that must be followed during operation and maintenance of the equipment.

WARNING Opening enclosures expose hazardous voltages. Always refer service to qualified
personnel only.

ATTENTION L'ouverture des cabinets expose des tensions dangereuses. Assurez-vous toujours que le
service ne soit fait que par des personnes qualifiees.

WARNUNG! Das öffnen der Gehäuse legen gefährliche Spannungen bloss.

Service sollte immer nur von qualifizierten Personal durchgeführt werden.

WARNING As standards, specifications, and designs are subject to change, please ask for confirma-
tion of the information given in this publication.

ATTENTION Comme les normes, spécifications et produits peuvent changer, veuillez demander
confirmation des informations contenues dans cette publication.

WARNUNG! Normen, Spezifizierungen und Pläne unterliegen Anderungen. Bitte verlangen Sie eine
Bestätigung über alle Informationen, die in dieser Ausgabe gemacht wurden.

NOTE This equipment has been tested and found to comply with the limits for a Class A digital
device, pursuant to part 15 of the FCC rules. These limits are designed to provide
reasonable protection against harmful interference when the equipment is operated in a
commercial environment.

This equipment generates, uses, and can radiate radio frequency energy and, if not
installed and used in accordance with the instruction manual, may cause harmful interfer-
ence to radio communications. Operation of this equipment in a residential area is likely to
cause harmful interference in which case the user will be required to correct the
interference at user's own expense.

WARNING To reduce the risk of fire or electric shock, install in a controlled indoor environment free of
conductive contaminants.

This equipment is intended only for installations in a RESTRICTED ACCESS LOCATION.

ATTENTION Pour réduire le riske d'inccendie ou d'électrocution, installer dans une enciente intérieure
contrôlée en température et humidité et sans contaminants conducteurs.

Ce matériel est destiné seulement pour des installations dans un EMPLACEMENT

RESTREINT D'ACCES.

WARNUNG! Um die Gefahr von Feuer und elektrischem Schock zu reduzieren, muss das Gerät in
einem temperatur - und feuchtigkeitskontrollierten Raum, frei von leitungsfähigen
Verunreinigungen, installiert werden. Dieses Gerät ist nur für die Installation an einem
Ort mit qeingeschränkter Zugangserlaubnis vorgesehen.

Diese Ausrüstung ist nur für Anlagen in einem EINGESCHRäNKTEN ZUGRIFF STANDORT
bestimmti.

ii Important Safety Instructions 86-160310-00 E00

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 Installation and User Manual

WARNING HIGH LEAKAGE CURRENT. Earth connection essential before connecting

supply.

ATTENTION COURANT DE FUITE ELEVE. Raccordement a la terre indispensable avant le

raccordement au reseau.
WARNUNG! Hoher Ableitstrom Vor Inbetriebnahme Schutzleiterverbindung herstellen.

Certification Standards - Three Phase UPS

◗ IEC 1004/ANSI C62.41 Standards for Surge Withstand Ability.
◗ FCC Part 15, Subpart J, Class A.
◗ UL/cUL 1778, Standard for Uninterruptible Power Supply Equipment.
◗ NEMA PE 1 - Uninterruptible Power Systems.
◗ NFPA 70 - National Electrical Code.
◗ ISO 9001.

Safety of Persons
◗ The UPS has its own internal power source (the battery). Consequently, the power outlets may be
energized even if the UPS is disconnected from the AC power source.

◗ The UPS must be properly grounded.

◗ The battery supplied with the UPS contains small amounts of toxic materials. To avoid accidents, the
directives listed below must be observed:
- Never burn the battery (risk of explosion).
- Do not attempt to open the battery (the electrolyte is dangerous for the eyes and skin).
- Comply with all applicable regulations for the disposal of the battery.

- Batteries constitute a danger (electrical shock, burns). The short-circuit current may be very high.
Precautions must be taken for all handling: remove watches, rings, bracelets and any other metal
objects, use tools with insulated handles.
- Do not lay tools or metal parts on top of batteries.

Product Safety

◗ A protection circuit breaker must be installed upstream and be easily accessible.

◗ The UPS can be disconnected from the AC power source by opening the input circuit breaker.
◗ UPS must be connected to a nearby power source that is easily accessible.
◗ Never block the ventilation grates of the UPS.
◗ The UPS must be installed in a controlled environment.

Special Precautions
◗ The UPS connection instructions and operation described in the manual must be followed in the indicated
order.

◗ Check that the indications on the rating plate correspond to your AC powered system and to the actual
electrical consumption of all the equipment to be connected to the UPS.

◗ Before and after the installation, if the UPS remains de-energized for a long period, the UPS must be
energized for a period of 24 hours, at least once every 3 months (for a normal storage temperature less
than 25°C). This charges the battery, thus avoiding possible irreversible damage.

86-160310-00 E00 Certification Standards and Safety of Persons iii

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 Comet 40-150kVA

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iv 86-160310-00 E00

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 Contents

section description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .page

Revision History . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .i
IMPORTANT SAFETY INSTRUCTIONS . . . . . . . . . . . . . . . . . . . . . . .ii
Certification Standards - Three Phase UPS . . . . . . . . . . . . . . . . . . . .iii
Safety of Persons . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .iii
Product Safety . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .iii
Special Precautions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .iii
CAUTION: Record All Serial Numbers! . . . . . . . . . . . . . . . . . . . . . .c iv
Symbol Usage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .c vi
Section Descriptions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .c vi

Section 1 System Description and Specifications

1.0 Scope . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1 — 1
1.1 General Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1 — 1
1.2 Major Components . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1 — 3
1.3 Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1 — 8
1.3.1 AC Input Ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1 — 9
1.3.2 AC Output Ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1 — 9
1.3.3 DC Ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1 — 9
1.3.4 Mechanical Specifications (UPS Cabinet Only) . . . . . . . . . . . . .1 — 10
1.3.5 Environmental Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . .1 — 10
1.3.6 DB15 Connector Pinouts and Designations . . . . . . . . . . . . . . . .1 — 10
1.4 Options and Accessories . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1 — 11
1.4.1 UPS Options . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1 — 11
1.4.2 Software and Communication Package . . . . . . . . . . . . . . . . . . .1 — 11

Section 2 Installation
2.0 Scope . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2 — 1
2.1 Receiving . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2 — 1
2.2 Handling . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2 — 1
2.3 Storage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2 — 2
2.4 Prerequisite to Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2 — 2
2.4.1 Environmental . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2 — 2
2.4.2 Mechanical . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2 — 3
2.4.3 Electrical . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2 — 3
2.5 Installation Procedures . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2 — 4
2.5.1 Placement . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2 — 4

86-160310-00 E00 Contents ci

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 Comet 40-150kVA

section description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .page

Section 2 Installation (continued)

2.6 Connections . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2 — 4
2.6.1 Main AC Input . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2 — 4
2.6.2 Bypass AC Input (Optional) . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2 — 4
2.6.3 Remote Emergency Power Off (REPO) . . . . . . . . . . . . . . . . . . .2 — 4
2.6.4 AC Output . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2 — 5
2.6.5 Battery . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2 — 5

Section 3 Operation
3.0 Scope . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3 — 1
3.1 Power Flow . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3 — 1
3.1.1 Power Flow, For Normal Operation . . . . . . . . . . . . . . . . . . . . . . .3 — 1
3.1.2 Power Flow, For On Battery Operation . . . . . . . . . . . . . . . . . . . .3 — 1
3.1.3 Power Flow, For Bypass Operation . . . . . . . . . . . . . . . . . . . . . . .3 — 2
3.2 Graphical User Interface, Controls and Indicators . . . . . . . . . . . .3 — 2
3.3 Startup Procedures . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3 — 5
3.3.1 Preliminary Checks . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3 — 5
3.3.2 Powering Up the Comet . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3 — 5
3.4 Inverter Manual Startup . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3 — 5
3.5 Operating Procedures . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3 — 6
3.5.1 Normal Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3 — 6
3.5.2 Operation on Battery Power . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3 — 6
3.5.3 Battery Duration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3 — 6
3.5.3.1 Return to AC Power . . . . . . . . . . . . . . . . . . . . . . . . . . . .3 — 6
3.5.4 Overload . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3 — 7
3.6 Emergency Shutdown Using EPO/REPO . . . . . . . . . . . . . . . . . .3 — 8
3.7 Forced Transfer . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3 — 8
3.8 Maintenance Bypass . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3 — 8
3.8.1 From Normal Maintenance Bypass Mode . . . . . . . . . . . . . . . . . .3 — 8
3.8.2 From Maintenance Bypass to Normal Mode . . . . . . . . . . . . . . . .3 — 9
3.9 Shutdown Procedures . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3 — 10
3.9.1 Inverter Shutdown . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3 — 10
3.9.2 Powering Down . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3 — 10
3.10 Alarms . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3 — 10

Section 4 Maintenance
4.0 Scope . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4 — 1
4.1 Battery Safety . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4 — 1
4.2 Preventive Maintenance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4 — 1
4.3 Replacement Parts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4 — 2

c ii Contents 86-160310-00 E00

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 Installation and User Manual

Figures
figure description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .page
1-1: Comet 40-80kVA. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
1-2: Comet 100-150kVA . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1 — 1
1-3: Single Line Diagram for the Comet 40-80kVA . . . . . . . . . . . . . . . . . . . . .1 — 2
1-4: Single Line Diagram for the Comet 100-150kVA . . . . . . . . . . . . . . . . . . .1 — 2
1-5: Front View of the Comet 40-80kVA . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1 — 4
1-6: Rear View of the Comet 40-80kVA . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1 — 5
1-7: Front View of the Comet 100-150kVA . . . . . . . . . . . . . . . . . . . . . . . . . . .1 — 6
1-8: Front View of Communications Components for
the Comet 100-150kVA . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1 — 7
1-9: Pinouts on the DB15 Connector . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1 — 10

2-1: The Comet 100-150kVA on Pallet . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2 — 2

3-1: Power Flow, For Normal Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3 — 1

3-2: Power Flow, For On Battery Operation . . . . . . . . . . . . . . . . . . . . . . . . . .3 — 1
3-3: Power Flow, For Bypass Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3 — 2
3-4: Comet Front Panel GUI, Controls and Indicators . . . . . . . . . . . . . . . . . .3 — 3
3-5: Output Current Overload Curve . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3 — 7
3-6: Output Power Overload Curve . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3 — 7

Tables
table description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .page
1-1: Comet 40-150kVA Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1 — 8
1-2: UPS Manager Dry Contact Interface . . . . . . . . . . . . . . . . . . . . . . . . . . .1 — 10

2-1: Recommended upstream protective device sizing * . . . . . . . . . . . . . . . .2 — 3

MGE Warranty & Proprietary Rights for Three Phase Products

MGE Standard Three Phase Warranty
Proprietary Rights Statement

Warranty and Product Registration

User Information
Product Information
Warranty Extension (Warranty+)

Customer Care Center - Three Phase Products

Technical Support and Product Services
Who to Contact
Scheduling Field Service Engineer Support
Return Policy for Repair of Three Phase Products (RGA)
Glossary

Reorder Form

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 Comet 40-150kVA

CAUTION: Record All Serial Numbers!

RECORD ALL SERIAL NUMBERS FOR THE COMET UPS AND ACCESSORIES.
THESE SERIAL NUMBERS WILL BE REQUIRED IF YOUR SYSTEM NEEDS SERVICE.
KEEP THIS MANUAL IN A PLACE WHERE YOU CAN REFERENCE THE SERIAL
NUMBERS IF SERVICE IS REQUIRED!

UPS SERIAL NUMBER: _______________________________________________________

BATTERY SERIAL NUMBER: ___________________________________________________

ADDITIONAL MODULES SERIAL NUMBERS:

____________________________ ______________________________

____________________________ ______________________________

____________________________ ______________________________

____________________________ ______________________________

____________________________ ______________________________

____________________________ ______________________________

NOTES:

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 Comet 40-150kVA

Symbol Usage

This manual uses five icon symbols with text to convey important information and tips.

WARNING Information provided to protect the user and service personnel against safety
hazards and/or possible equipment damage.

CAUTION Information provided to protect the user and service personnel against possible
equipment damage.

ELECTRICAL Information provided to protect the user and service personnel against possible
electrical hazard and equipment damage.

IMPORTANT Information provided as an operating instruction, or as an operating tip.

NOTE Information provided as an operating tip or an equipment feature.

Section Descriptions
1 System Description and Specifications

Provides a general description of the Comet 40-150kVA Uninterruptible Power Systems major components,
available options, and system specifications.

2 Installation

Installation of the Comet 40-150kVA UPS, which include receiving, handling, and storage procedures;
prerequisites to installation; installation procedures; and startup procedures.

3 Operation

Important information on the Comet 40-150kVA systems’ operation procedure sequences; for normal, on
battery, and bypass operation, with descriptions of the control and display indicators.

NOTE For details on the Graphical User Interface (GUI) display, please refer to
manual 86-160316-00.

4 Maintenance

Preventive maintenance and battery safety instructions for Comet 40-150kVA UPS, and information about
replacement parts, and customer service.

A Glossary provides definitions of abbreviations and terms used in this manual.

NOTE This manual provides technical information required for operation and
maintenance of the Comet 40-150kVA Uninterruptible Power System (UPS).
Please read this manual before operating the Comet 40-150kVA equipment.
Please retain this manual for future reference.

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 System Description and Specifications

1.0 Scope

Provides a general description of the Comet 40-150kVA Uninterruptible Power Systems major components,
available options, and system specifications.

1.1 General Description

The Comet family consists of compact, high-efficiency Uninterruptible Power Systems which are available in power
ratings from 40-150kVA, and are optimized for compatibility with nonlinear computer-type loads. Computer-aided
UPS diagnostics and modular construction assure that any required service can be identified and completed rapidly.
Remote system monitoring, remote annunciation of UPS performance signals and communication capabilities allow
total control of the UPS by its user. See Figures 1-1 and 1-2.

The Comet UPS and its auxiliary equipment are designed for installation in a room where humidity and temperature
can be controlled. The recommended and maximum environmental parameters are listed in the Specifications
section of this document.

Figure 1-1: Comet 40-80kVA. Figure 1-2: Comet 100-150kVA.

Setup Load Load Protected

Alarms Battery
Inputs 0% Setup Load
Main % KVA Load Load Protected
Alarms Battery
Inputs 0%
Main % KVA Load
KA2

UPS
Input load
KA1 K3N KA2

UPS
QF1 Input load
KA1 K3N

QF1

⁄ı Í

⁄ı Í

EMERGENCY
POWER OFF

EMERGENCY
POWER OFF

fault

fault

CO M E T
CO M E T

MG E
UPS SYSTEMS
MG E
UPS SYSTEMS

86-160310-00 E00 System Description and Specifications 1—1

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 Comet 40-150kVA

Figure 1-3, and 1-4 show single-line diagrams of a typical UPS system installation. During normal operation,
utility power (Main Input) is supplied to the UPS Rectifier where it is converted to DC voltage. The Inverter
converts the DC voltage from the Rectifier to three-phase regulated AC voltage, which supplies the critical load.
During power failure conditions, the Inverter is supplied by the stored energy in the batteries, and the load is
powered continuously with no disruption.

Figure 1-3: Single Line Diagram for the Comet 40-80kVA.

UPS CABINET

STATIC SWITCH
BYPASS KA2
AC INPUT SR1
(OPTIONAL)

KA1 K3N TO
MAIN
CRITICAL
AC INPUT
INPUT OUTPUT LOAD
FUSES RECTIFIER INVERTER FUSES

BATTERY
CABINET QF1

BATTERY

Figure 1-4: Single Line Diagram for the Comet 100-150kVA.

UPS CABINET

STATIC SWITCH
BYPASS KA2
AC INPUT SR1

KA1 K3N TO
MAIN
CRITICAL
AC INPUT
INPUT OUTPUT LOAD
FUSES RECTIFIER INVERTER FUSES

BATTERY
CABINET QF1

BATTERY

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 Installation and User Manual

1.2 Major Components

The following is a description of the cabinets and major components. Refer to Figures 1-5 to 1-8.

UPS Cabinet Converts the input AC power to direct current and charges the battery. DC power
is converted back to clean AC power by the inverter for the critical load. Section
3 describes the operation in detail.

Auxiliary Cabinet Performs the voltage conversion for the input AC and/or bypass AC using step-
up and/or step-down transformers.

Battery Cabinet The battery cabinet stores energy for use by the Inverter. The stored energy is
utilized in the event that the AC input power from the utility source fails, or falls
outside of acceptable tolerances. The internal Battery Charger maintains the
charge of the battery system. The DC output voltage of the charger is tempera-
ture regulated to ensure an optimal charge voltage. If a customer supplied battery
system is to be used, an external battery charger may be necessary.

The standard battery system is housed in a separate enclosure. For systems where
additional back-up time is required, up to two (2) additional battery cabinets are
available.

A standard battery cabinet is available in an adjacent configuration or a stand-

alone configuration. Adjacent battery cabinets are attached to the right side of the
UPS using c-brackets provided with the cabinet. Stand-alone battery cabinets
are remote from the UPS. Refer to the battery cabinet installation drawing for
more details. An external battery system can also be supplied by the customer.

Rectifier Converts the AC input voltage from the utility source into a DC voltage, supplying
the Inverter.

Inverter Converts the DC voltage supplied from either the Rectifier or the battery system into
a three-phase AC voltage. An AC output filter is used to achieve a computer-grade
sinewave output voltage waveform, with a total harmonic distortion of less than 2%
under linear-load conditions.

Static Switch Transfers the load between the Inverter output and the bypass AC source without
interrupting the supply of power to the load, allowing the load to continue
operation in the event of a UPS fault. The Static Switch circuit assures that
voltage from the UPS output cannot be fed back to the utility input lines.

Battery System Stores energy for use by the Inverter. The stored energy is utilized in the event
that the AC input power from the utility source fails, or falls outside of acceptable
tolerances. The internal Battery Charger maintains the charge of the battery
system. The DC output voltage of the charger is temperature regulated to ensure
an optimal charge voltage. If a customer supplied battery system is to be used,
an external battery charger may be necessary.

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 Comet 40-150kVA

Figure 1-5: Front View of the Comet 40-80kVA.

1 (KA1) Input Contactor

2 (K3N) Output Contactor

3 (KA2) Bypass Input Contactor (Optional)

4 (F1, F2, F3) Input Fuses

5 (F4, F5, F6) Output Fuses

6 (SR1) Rotary Switch

7 Rectifier/Static Switch Assembly

8 Inverter Assembly

9 Feedback PCA

10 DC Power Supply PCA

11 Interconnect PCA

12 High-Frequency Power Supply PCA

13 (FU1-FU6) Power Supply Fuses

14 Teleservice Receptacles (J1-J2) & Fuse (FU13)

15 Heatsink Cooling Fans

16 (TB3) Separate Bypass Input Terminal Block

17 Battery Connections

18 (TB1) Main Input Terminal Block

19
(TB2) Output Terminal Block

20 (SR2) Fan Control Switch

DETAIL BEHIND ITEM 25 21 (FU7-FU12) Fan and Teleservice Fuses

A
22 Ground Busbar

23 Neutral Busbar
01

04 24 Bottom of Top-Entry Channel

05
25 Battery Charger
02

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Figure 1-6: Rear View of the Comet 40-80kVA.

TOP ENTRY
CONDUIT LANDING

TOP ENTRY
CHANNEL

T1 INPUT
TRANSFORMER
(OPTIONAL)

T2 OUTPUT
TRANSFORMER
(OPTIONAL)

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 Comet 40-150kVA

Figure 1-7: Front View of the Comet 100-150kVA.

1 (KA1) Input Contactor

2 (K3N) Output Contactor

3 (KA2) Bypass Input

4 (F1, F2, F3) Input Fuses

5 (F4, F5, F6) Output Fuses

6 (SR1) Rotary Switch

7 Rectifier

8 Static Switch

9 Inverter Assembly

10 Chopper Assembly

11 Interconnect PCA

12 Ground Busbar

13 Neutral Busbar (option)

14 Charger PCA

15 Heatsink Cooling Fans

16 DC Cap Modules

17 (TB5) Control Terminal Block

18 (FU1-FU21) Control Fuses

19 Power Supplies Assembly

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Figure 1-8: Front View of Communications Components for the Comet 100-150kVA.

TOP CONDUIT LANDING FOR

CABLE ACCESS TO PCA'S

COMMUNICATION
PCAs

BOTTOM CONDUIT LANDING

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 Comet 40-150kVA

1.3 Specifications

The Comet 40-150kVA UPS systems are rated for various input and output voltages (see Table 1-1). When
different input and/or output voltages are specified, optional transformers provide step up/down functions as
required.

Table 1-1: Comet 40-150kVA Specifications.

INPUT
INPUT OUTPUT OUTPUT CURRENT TOTAL NET HEAT
VOLTAGE VOLTAGE CURRENT (on UPS/ WIDTH WEIGHT LOSS
(VAC) (VAC) (Amperes) on bypass) (in/mm) (lb/kg) (Btu/hr)
(Amperes)
40kVA/32 kW 208 208 111 102/111 32.75/832 1760/800 13500
220 220 105 96/105 32.75/832 1760/800 13500
480 208 111 43/111 32.75/832 1360/617 12135
480 480 48 43/48 32.75/832 880/400 8220
600 208 111 35/111 60.00/1524 2820/1279 13500
50kVA/40 kW 208 208 139 127/139 32.75/832 1760/800 16873
220 220 131 120/131 32.75/832 1760/800 16873
480 208 139 54/139 32.75/832 1360/617 15169
480 480 60 54/60 32.75/832 880/400 10276
600 208 139 44/139 60.00/1524 2820/1279 16873
65kVA/52 kW 208 208 180 162/180 32.75/832 2115/960 17552
220 220 170 153/170 32.75/832 2115/960 17552
480 208 180 70/180 32.75/832 1590/721 15433
480 480 78 70/78 32.75/832 970/440 11328
600 208 180 57/180 60.00/1524 2910/1320 17552
80kVA/64 kW 208 208 222 200/222 32.75/832 2115/960 21603
220 220 210 190/210 32.75/832 2115/960 21603
480 208 222 86/222 32.75/832 1590/721 21603
480 480 96 86/96 32.75/832 970/440 13992
600 208 222 70/222 60.00/1524 2910/1320 21603
100kVA/80 kW 208 208 278 256/278 69.50/1765 3400/1543 28300
220 220 263 242/263 69.50/1765 3400/1543 28300
480 208 278 109/278 42.75/1086 2450/1112 22278
480 480 120 109/120 42.75/1086 1460/662 15420
600 600 96 89/96 96.00/2438 3700/1678 28300
600 208 278 91/278 69.50/1765 3400/1543 28300
125kVA/100 kW 208 208 347 316/347 69.50/1765 3400/1543 38247
220 220 328 298/328 69.50/1765 3400/1543 38247
480 208 347 134/347 42.75/1086 2450/1112 30662
480 480 150 134/150 42.75/1086 1460/662 20804
600 600 120 109/120 96.00/2438 3700/1678 38247
600 208 347 109/347 69.50/1765 3400/1543 38247
150kVA/120 kW 208 208 417 378/417 69.50/1765 3400/1543 50759
220 220 394 375/394 69.50/1765 3400/1543 50759
480 208 417 160/417 42.75/1086 2450/1112 41560
480 480 180 160/180 42.75/1086 1460/662 26351
600 600 145 131/145 69.50/1765 3700/1678 50759
600 208 417 131/417 96.00/2438 3400/1543 50759

(See notes that follow)

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NOTES:
1. Total width, weight, and heat loss are for system line-up excluding battery cabinets.
2. Data does not include battery data; refer to the installation drawings supplied with your equipment.
Consult the installation drawings provided with your equipment.

1.3.1 AC Input Ratings

Voltage 480 VAC, + 12%, -15%
Frequency 60 Hz ± 4%
Phases 3 Ø (phase sequence must be A, B, C, clockwise)
Wires 3 wires plus ground (480-480 VAC only)
Power factor Approximately 0.98 at full load

Current (on UPS/ on BYPASS) @ 480 VAC

40kVA 50kVA 65kVA 80kVA 100kVA 125kVA 150kVA
43A/48A 54A/60A 70A/78A 86A/96A 109A/120A 134A/150A 160A/180A

1.3.2 AC Output Ratings

Voltage (inverter only) 480 ± 1% VAC (steady-state conditions)

480 ± 5% VAC (transient conditions from 0% to 100% or 100% to 0%)
Frequency 60 Hz ± 0.1% (free-running)
Phases 3 Ø (phase sequence must be A, B, C, clockwise)
Wires 3 wires plus ground (480-480 VAC only)
Power factor 0.8

Current @ 480 VAC

40kVA 50kVA 65kVA 80kVA 100kVA 125kVA 150kVA
48A 60A 78A 96A 120A 150A 180A

Total harmonic
distortion (THD) <2% (linear load)

<3% (for 100% non-linear load with a crest factor of less than 3.0)

Dynamic regulation ± 1% for balanced load

± 2.5% for 100% unbalanced load
Dynamic response ± 5% for 100% step load change

Overload 105% - 110% of rated current for 10 minutes

>110% - 130% of rated current for 1 minute
>130% - 150% of rated current for 10 seconds
>150% of rated current for 0.15 seconds

1.3.3 DC Ratings

Battery voltage (25° C) float: 490 Vdc

nominal: 432 Vdc
minimum: 360 Vdc
Maximum Current at cut-off voltage
40kVA 50kVA 65kVA 80kVA 100kVA 125kVA 150kVA
96 ADC 120 ADC 154 ADC 189 ADC 235 ADC 294 ADC 353 ADC

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 Comet 40-150kVA

1.3.4 Mechanical Specifications (UPS Cabinet Only)

Height 66.70 in/1694 mm
Width 32.75 in/832 mm
Depth 33.42 in/823 mm

Weight at 480 VAC in and 480 VAC out

40/50kVA 65/80kVA 100-150kVA
880 lbs/400 kg 970 lbs/440 kg 1460 lbs/662 kg

1.3.5 Environmental Specifications

Temperature
Operating: 0° C to 30° C (32° F to 86° F) continuous
15°C(60°F) to <25° C (<77° F) recommended
40° C (104° F) up to 8 hrs at 75% load
Non-operating
and storage: -30° C to 70° C (-22° F to 158° F)

Humidity 0 to 95% non-condensing

Altitude <3000 ft. (1000m), up to 6000 ft. (<2000 m) @ 28° C (82°F) maximum

1.3.6 DB15 Connector Pinouts and Designations

The UPS Manager connector enables communication with the most common computer systems (AS/400,
NOVELL, etc.), or with the optional "UPS Manager UM1" software.

Table 1-2: UPS Manager Dry Contact Interface.

UPS Manager Dry Contact Interface (DB15) Softunor (DB9)

Operation on Inverter Diagnostics (for MGE Customer Care Center use only)
Operation on Bypass
Operation on Battery
Low Battery Shutdown Warning
UPS Remote Inverter Shutdown

Figure 1-9: Pinouts on the DB15 Connector.

DB15 -pin
connector

PIJO PC board 5
NO 8 Operation on Inverter
NC
Operation on
NO
Breaking NC 6 Bypass
capacity of
contacts is: 10
8 7 6 5 4 3 2 1
P = 3va NO 9 Operation on Battery
V = 30VDC max. NC 11
15 14 13 12 11 10 9
I = 100mA max.
13

NO 7 Low Battery Shutdown Warning

NC 12

14
UPS Remote Inverter Shutdown
(3 to 15 VDC voltage signal)
4

GROUND 1

Please note that once the UPS remote inverter shutdown signal is applied, the Inverter stops and the
load transfers to bypass after a predetermined time (typically 2 minutes).

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1.4 Options and Accessories

Options are available for the Comet 40-150kVA UPS’s. Most options must be specified at the time of the original
order for factory installation. Some options can be field installed; contact your MGE Sales Representative for
further information.

Auxiliary Cabinet The auxiliary cabinet may provide one or both of the following options: an input
bypass step up/down transformer, and an output distribution panel. An output
distribution panel provides connection points for distribution of AC power to
computers and other equipment. Also available are external maintenance bypass
cabinets.

Extended Battery Cabinets Up to two Extended Battery Cabinets are available to provide extra back-up time
during power outage.

1.4.1 UPS Options

These options are internal to the Comet.

Isolated Redundant System This option is used to connect the static switch and maintenance bypass to a
reserve UPS source for redundancy

UPS without Standard This option allows for the connection of a customer-supplied battery system to
Battery Subsystem the UPS.
(External Batteries)

Communication Options Communication options may be used simultaneously on the Comet, thus
enabling communication with a wide number of computers and control devices.

Monitor Plus Mini terminal for control and display of system parameters. This option can be in-
stalled locally or remotely.

Contact 5 This option offers communication of five different signals via dry relay contacts:

◗ Load on UPS
◗ Load on Bypass
◗ Operation on Battery
◗ Low Battery Shutdown Warning
◗ Summary Alarm (major or minor faults)

U-Talk This option manages an RS232 serial interface using an ASCII protocol.

JBUS/RS485 This option enables remote monitoring of the Comet.

1.4.2 Software and Communication Package

Solution-Pac ◗ Automatic file shutdown during power outage or severe brownout for stand-
alone systems.

◗ Automatic file shutdown for network servers plus additional monitoring and
network communication functions.

◗ Automatic file shutdown with user-friendly control panel and advanced

decision-making functions for Windows. This package includes an easy to
use load.

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 Installation

2.0 Scope

Installation of the Comet 40-150kVA UPS, which include receiving, handling, and storage procedures; prerequisites
to installation; installation procedures; and startup procedures.

CAUTION Scheduling of the MGE Field Service Engineers typically should be done 7 to 10
days before they are required on-site. If the startup of the product is critical to
maintaining your schedule, please call the MGE toll free telephone number at
1-800-438-7373 for assistance.

2.1 Receiving

Before accepting the shipment from the freight carrier, inspect the exterior surfaces of shipping container(s),
packaging, and equipment for damage that may have occurred during transit. If the shipping containers or
equipment show evidence of damage, note the damage on the receiving document (bill of lading) prior to
signing for receipt of equipment. Verify that the equipment nameplate corresponds with the equipment ordered.

Damage claims should be filed directly with the carrier. Replacements for damaged components can be ordered
by calling 1-800-438-7373.

2.2 Handling

Any equipment shipped on a shipping pallet is intended for handling by a pallet jack or a fork lift truck. Move
the equipment to its intended location while still mounted on its pallet, and remove the equipment from the pallet
when it is near its final location. See Figure 2-1.

The Comet UPS and optional auxiliary cabinets have heavy-duty casters to allow the equipment to be moved
into position easily once they have been unloaded from the shipping truck. Once the UPS is in its final position,
the leveling jacks on all four-bottom corners should be lowered to secure the cabinet in place. Refer to the
installation drawings that were shipped with the cabinets.

Battery cabinet weighing less than 3000 lbs. are equipped with casters for ease of handling on site. For
shipment, these cabinets are mounted on pallets to prevent movement on ramps and other inclined surfaces.
A forklift (4000 lbs capacity or greater) is required to remove the battery cabinet from its pallet. The 42" battery
cabinets should be lifted from the side only. For battery cabinets weighing more than 3000 lbs., no casters are
provided, and therefore must be moved by forklift only.

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 Comet 40-150kVA

If the equipment is to be stored for more than three months before installation, it should be unpacked and
connected to an AC input source to allow the batteries to be recharged. Refer to the installation instructions that
follow, and the installation drawings.

Figure 2-1: The Comet 100-150kVA on Pallet.

2.3 Storage

If the equipment is to be stored prior to installation, it should be stored in a cool, dry, well-ventilated location
that is protected against rain, splashing water, chemical agents, etc. The equipment should be covered with a
tarpaulin or plastic wrapper to protect it against dust, dirt, paint, or other foreign materials.

IMPORTANT Batteries should be stored no longer than three (3) months at approximately 25°C
(77° F) prior to recharging. Too high or too low a temperature will damage batteries.
Exceeding the recommended ambient storage temperature will reduce back-up time
and may adversely affect life.

2.4 Prerequisite to Installation

This section provides more information for a successful and efficient installation of the Comet 40-150kVA.
Installation of equipment must be handled by skilled technicians and electrician's familiar with the requirements
of high energy electrical equipment. The installation must comply with the requirements of the National
Electrical Code (NEC, ANSI/NFPA 70, latest issue) and with local codes and requirements as applicable. We
strongly recommend contracting MGE Customer Support Services for startup. Do not allow unqualified
personnel to handle or operate the equipment.

2.4.1 Environmental

The Comet 40-150kVA UPS is intended for use in an environment where control of temperature and humidity is
provided. The maximum operating and recommended environmental parameters are provided in the Specifications
section of this document.

The Comet UPS generates heat and exhausts air through the top portion of its enclosure. Heat loss data is
provided in Table 1-1.

Consult the installation drawings provided with your equipment.

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2.4.2 Mechanical

The Comet UPS can be mounted on a raised computer room floor, or flush-mounted on a concrete floor. All
floors must be level. On a raised floor, conduits can be run below the floor, with cut-outs made in the floor tiles
as shown on the installation drawings.

Allow at least three feet of clearance in front of the UPS for normal operation (access to the UPS controls). The
Comet requires at least 36 inches top clearance for ventilation.

2.4.3 Electrical

Electrical service for the Comet UPS should be supplied on its own dedicated branch circuit. Main input cables and
upstream protective devices must be provided and sized per the National Electrical Code (NEC, ANSI/NFPA 70,
latest issue), and as appropriate for your load and distribution requirements. Cable sizing data is provided on the
installation drawings supplied with the equipment. The Comet 480/480V UPS is not a separately-derived source.
The Comet 208/208V UPS is a separately derived source. The neutral must be grounded on a separately derived
source (like the Comet 208/208V UPS).

CAUTION The customer supplied upstream protective device shall open in one cycle
when 10 times the output rated current is applied or in the event of an output
short circuit when the unit is working on “Static Switch.”

Refer to the upstream circuit breaker manufacturer’s characteristic curves for

proper trip settings.

Table 2-1: Recommended upstream protective device sizing *.

INPUT VOLTAGE 40kVA 50kVA 65kVA 80kVA 100kVA 125kVA 150kVA

208 150A 175A 225A 300A 350A 450A 500A

220 150A 175A 225A 300A 350A 450A 500A

480 70A 80A 100A 125A 150A 200A 225A

600 60A 70A 80A 100A 125A 150A 200A

* Size determined using nominal input currents.

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 Comet 40-150kVA

2.5 Installation Procedures

The steps to be followed are:

◗ Placement of the UPS and associated equipment.

◗ Connection of input power, output power, and control cables.

Installation of UPS equipment must be handled by skilled technicians and electrician's familiar with the special
requirements of high-energy electrical equipment. We strongly recommend contracting MGE Customer Support
Services for start-up of the installed Comet UPS system. Do not allow unqualified personnel to handle or
operate the Comet UPS.

Refer to the installation drawings for proper placement and connections of auxiliary cabinets.

2.5.1 Placement

Move the Comet UPS, battery cabinets (if any), and auxiliary cabinets (if any), to their final location (see Figure
2-2). For cabinets installed adjacent to each other, alignment is critical to properly install the mechanical and
cable interconnections. Allow at least 36 inches clearance above all cabinets for maintenance and cooling.

Figure 2-2: Placement of UPS and other Cabinets.

For side and rear clearances,

AUX BATTERY refer to each cabinet's
UPS installation drawing
CAB CABINET(s)

36" recommended

2.6 Connections

Electrical connections and cabinet interconnection will vary depending upon the configuration of your Comet
UPS system. Refer to Figures 2-3 & 2-4 and to the installation drawings supplied with your equipment.

CAUTION Before making any electrical connections, verify that all battery disconnect
circuit breaker (QF1) are in the “off” position. Customer-supplied upstream
protective devices and distribution circuits should be OFF.

2.6.1 Main AC Input

The connections to be made are the three phases, and ground cables from the utility AC power source to the
UPS. The main AC input cables are terminated at the "Main Input" Terminal Block (TB1) for 40-80kVA and the
input busbars for 100-150kVA. Complete wiring instructions for your installation are provided on the installation
drawings supplied with the equipment.

2.6.2 Bypass AC Input (Optional)

The connections to be made are the three phases, and ground cables from the bypass AC input power source
to the UPS. The bypass AC input cables are terminated at the "Bypass Input" Terminal Block (TB3) for 40-80kVA
and the bypass busbars for 100-150kVA. This option provides a separate AC input source for bypass operation.

2.6.3 Remote Emergency Power Off (REPO)

The control connections are available for "Remote Emergency Power Off" (REPO) through a customer-supplied
normally closed pushbutton. With REPO connected, the jumper on the "REPO" terminal blocks must be removed.

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2.6.4 AC Output

The connections to be made are the three phases, and ground cables from the load source to the UPS. The
output cables are terminated at the Output Terminal Block (TB2) for 40-80kVA, and the output busbars for 100-
150kVA.

Load cables must be run separately from all other cables (power supply or computer-system interconnection
cables). They should not pass near interference-emitting equipment or sensitive loads.

2.6.5 Battery

The connections to be made are the positive, negative, and ground cables from the battery cabinet to the UPS.
These are terminated at the appropriate connections in the UPS cabinet (see Figures 2-3 and 2-4). Additionally,
control wires and temperature sensors in the battery cabinet must be terminated. Refer to the battery cabinet
installation drawings for more details.

Figure 2-3: Connections for Comet 40-80kVA UPS.

Separate Bypass Main Input Output Fan Control Fan and
Input Terminal Battery Terminal Block Terminal Block Switch Teleservice Fuses
Block TB3 Connections TB1 TB2 SR2 FU7-FU12
(Optional)

Ground Busbar Neutral Busbar

Figure 2-4: Connections for Comet 100-150kVA UPS.

OUTPUT

C4
B4
A4
OPT
C5
B5
BYPASS
A5
+ -
C3
B3
A3

INPUT BATT.

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 Operation

3.0 Scope

Important information on the Comet 40-150kVA systems’ operation procedure sequences; for normal, on battery,
and bypass operation, with descriptions of the control and display indicators.

3.1 Power Flow

3.1.1 Power Flow, For Normal Operation

During normal operation the AC input source supplies the Rectifier, which converts the incoming AC power to
DC. The rectifier in turn supplies the Inverter, which converts DC power to AC to supply the attached load (see
Figure 3-1).

Figure 3-1: Power Flow, For Normal Operation.

STATIC SWITCH

BYPASS
INPUT
(OPTIONAL)

RECTIFIER INVERTER

MAIN
TO LOAD
INPUT

BATTERY

3.1.2 Power Flow, For On Battery Operation

When AC input power fails, the UPS goes to on-battery operation. DC power is supplied from the UPS battery
system to the inverter, which converts battery power (DC) to AC power to supply the attached load (see Figure
3-2).

Figure 3-2: Power Flow, For On Battery Operation.

STATIC SWITCH

BYPASS
INPUT
(OPTIONAL)

RECTIFIER INVERTER

MAIN
TO LOAD
INPUT

BATTERY

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 Comet 40-150kVA

3.1.3 Power Flow, For Bypass Operation

Should there be an internal fault in the UPS, the load will automatically be transferred to the "Static Switch".
(If bypass AC input is within tolerance). The load is supplied without interruption while the UPS is bypassed (see
Figure 3-3).

Figure 3-3: Power Flow, For Bypass Operation.

STATIC SWITCH

BYPASS
INPUT
(OPTIONAL)

RECTIFIER INVERTER

MAIN
TO LOAD
INPUT

BATTERY

3.2 Graphical User Interface, Controls and Indicators

The Graphical User Interface (GUI) display, controls and indicators are located on the front panel in the upper
left-hand corner of the Comet UPS, and consist of the following: (See Figure 3-4 for arrangement.)

◗ A Graphical User Interface (GUI) display.

◗ An alert buzzer.

◗ Four (4) LED's which indicate the overall operating status of the UPS.

◗ An “Inverter ON”, an “Inverter OFF”, and an “EPO” pushbutton.

◗ Three (3) control keys.

The basic Comet indications consist of the following:

◗ Normal operation (load protected)

◗ Battery power is not available (load not protected)

◗ Downgraded operation (fault)

◗ Danger of a break in the supply of power to the load (load not protected)

◗ Operation on battery power

When the buzzer is activated it will provide an audible warning to the operator by sounding a pulsed “beep”
when any of the following conditions occur:

◗ The load is supplied directly by AC input power via the "Static Switch".

◗ The Inverter is operating on battery power.

◗ Any operating faults or change in operating status.

It beeps softly and slowly for minor faults and during Inverter operation on battery power. When the low battery
shutdown warning level has been reached, the sound volume and the frequency of the beeps increase.

In the event of an Inverter shutdown, a continuous alarm is emitted. A buzzer reset key is provided on the front
panel. Detection of a new fault will reactivate the buzzer.

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Figure 3-4: Comet Front Panel GUI, Controls and Indicators.

1
Setup Load Load Protected
Alarms Battery
0% % KVA Load
Inputs Main

KA2

UPS
Input load
KA1 K3N

QF1

3 5 7 8
⁄ı Í

2
EMERGENCY
POWER OFF
4 6

9 11
fault

10

1 Graphical User Interface (GUI) Display 7 Inverter ON (green) pushbutton

2 Emergency Power Off Switch 8 Inverter OFF (gray) pushbutton

3 Load Not Protected (red) LED 9 Fault Reset Key

4 Fault (yellow) LED 10 Security Key

5 Battery Status (yellow) LED 11 Buzzer Reset Key

6 Load Protected (green) LED

NOTE For details on the Graphical User Interface (GUI) display, please refer to
manual 86-160316-00.

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 Comet 40-150kVA

Graphical User This display provides specific information concerning normal UPS operation as
Interface Display well as faults.

Emergency Power Off This red Emergency Power Off (EPO) pushbutton is used to stop the unit during
an emergency situation only. All power is removed from the load.

Load not protected LED This red LED turns on when any of these conditions occur:

◗ Direct supply of power to the load by AC input power via the "Static Switch"
because of Inverter shutdown (voluntary or following an overload or an
internal fault).

◗ Battery power is not available. Battery circuit breaker is in the "OFF" position
or battery not connected.

Fault LED This yellow LED indicates an operating fault or an environmental fault. However,
the load continues to be supplied by the Inverter.

Battery Status LED This yellow LED indicates:

◗ Inverter operation on battery power following an AC input failure or detection

of an AC input voltage outside of tolerances.

◗ It flashes to indicate that the low battery shutdown warning level has been
reached.

◗ If the LED flashes when the system is not on battery power, battery
conditions should be checked.

Load protected LED This green LED indicates that the Comet is operating normally. The load is
protected and supplied via the Inverter output. Bypass Switch SR1 must be in the
"NORMAL" position.

Inverter on This green pushbutton is used to start the inverter.

Inverter off This gray pushbutton is used to stop the inverter.

Fault Reset This key clears the faults stored in memory. Clearing of alarms in memory is
accepted only after the alarm conditions themselves have been corrected.

Security Key This key enables forced operation. The security key must be held down while the
desired function is executed. Refer to the Forced Transfer section.

Buzzer Reset This key allows the user to silence the buzzer after a particular alarm. However,
the buzzer will sound if another alarm occurs.

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 Installation and User Manual

3.3 Startup Procedures

3.3.1 Preliminary Checks

◗ Check the settings of the protection devices.

◗ Verify that the battery circuit breaker(s) are in the "OFF" position.

◗ Verify that the Manual Bypass Switch SR1 is set to the “NORMAL” position.

◗ Verify that the fan switch (SR2) is set to the “ON” position.

◗ Check that the ventilation system is not blocked (air entry through the bottom front and exhaust through the top).

◗ Check that there is a minimum of 36 inches clearance at the front and top for ventilation.

◗ Check that the Comet no longer rests on its 4 wheels (lifting levelers in place).

◗ Check that the load-circuit breaker(s) (where applicable) are in the "OFF" position.

3.3.2 Powering Up the Comet

CAUTION As soon as AC input power is supplied to the Comet (customer supplied up-
stream circuit breaker is in the “ON” position), the load is initially supplied
via the “Static Switch.” The Graphical User Interface (GUI) display will begin
to startup.

◗ Apply AC input power to the unit by closing the upstream circuit breaker.

◗ Put the battery circuit breaker(s) in the “ON” position.

◗ The buzzer sounds.

◗ The status LED's go on.

◗ The rectifier starts up.

◗ The cooling fans startup.

◗ The inverter automatically starts up, except if the system is in “manual startup” mode (optional).

◗ If the transfer conditions (AC input power within tolerances) are correct, the Inverter comes on line and supplies
the load. The green "Load Protected" LED goes on.

3.4 Inverter Manual Startup

Typically, the Inverter is configured for automatic startup mode. For manual startup mode configuration, contact
MGE Customer Support Services.

For manual startup:

◗ Press the green "Inverter ON" pushbutton.

◗ The green "Load Protected" LED flashes.

◗ The Inverter starts and if the transfer conditions are correct, the load is transferred to the Inverter.

◗ The red "Load Not Protected" LED goes off.

◗ The green "Load Protected" LED goes on.

◗ The GUI display indicates Load Protected.

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 Comet 40-150kVA

3.5 Operating Procedures

3.5.1 Normal Operation

◗ The AC input power is present.

◗ The green "Load Protected" LED is on. The GUI display indicates the operating status of the UPS.

◗ The power drawn by the load is supplied by AC input power via the Rectifier and Inverter modules. The Battery
Charger float charges or recharges the battery.

◗ The GUI display indicates “Load Protected”.

3.5.2 Operation on Battery Power

When AC input power fails or is out of tolerance, the Rectifier shuts down and the battery supplies the power
required by the Inverter to supply the load. The battery discharges.

◗ The green "Load Protected" LED is on. The GUI display indicates the operating status of the UPS.

The user is warned of operation on battery power by the buzzer and by the yellow "Battery Status" LED. This
information is also available via the standard UPS MANAGER DB15 connector.

3.5.3 Battery Duration

During an AC input power failure, the duration of Inverter operation on battery power depends on:

◗ The rated capacity of the battery.

◗ The power drawn by the load.

◗ The battery temperature.

◗ The charge level of the battery.

◗ The age of the battery.

The real backup time, which depends on the actual load, may be greater if the Inverter operates at less than
full rated load. It is possible, during operation on battery power, to increase the battery backup time by reducing
the power drawn by the load (shedding of non-priority load).

A low battery shutdown warning signal is available via the standard UPS MANAGER DB15 connector for remote
indications. It warns the user of upcoming battery shutdown at a user-determined level of remaining power.

On the UPS itself, the buzzer beeps louder and more rapidly, and the yellow "Battery Status" LED flashes
rapidly.

The end of battery power occurs when the battery reaches shutdown level. At this point, the Inverter shuts down
and the UPS goes into "Stand-By" mode. Load is no longer supported. If the input AC power does not return to
within tolerance within approximately 2 hours, the unit will shutdown.

Once input AC power returns, the batteries begin their charging cycle. It takes approximately 10 hours of online
operation to restore 10 minutes of backup time.

3.5.3.1 Return to AC Power

When the AC input power failure ends or power returns to within tolerances:

◗ If the end of battery backup power was not reached, the Comet returns to normal operating mode.

◗ If the end of battery backup power was reached and unit is in "Standby" mode, the Rectifier and the Inverter
automatically start up (the inverter must be manually started if the system is in manual startup mode).

◗ If the end of "Stand-By" mode was reached, follow the Startup procedure.

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 Installation and User Manual

3.5.4 Overload

When an Inverter temporary overload occurs, the load is transferred to the "Static Switch". Return to normal
mode of operation is automatic, following elimination of the overload.

The Inverter can handle a continuous overload for a given duration depending on the size of the output current
overload (see Figure 3-5) or the output power overload (see Figure 3-6).

When an overload occurs:

◗ The buzzer sounds.

◗ The yellow "Fault" LED goes on.
◗ The Inverter shuts down at the end of its corresponding overload time.
◗ The load is supplied by AC input power via the "Static Switch".
◗ The green "Load Protected" LED goes off.
◗ The red "Load Not Protected" LED goes on.

The operating status of the UPS is provided by the GUI display. If the overload continues during operation via
the "Static Switch", the supply of power to the load is interrupted after a specified time.

When the Comet shuts down because of a continuous overload, the "Fault Reset" key must be pressed prior to
return to normal operation and after elimination of the overload.

Figure 3-5: Output Current Overload Curve.

time

10 mn

1 mn
10 s

1s

rated load
current
0.15 s
1.05 1.1 1.3 1.5 1.7 1.9 3 I (A)

Figure 3-6: Output Power Overload Curve.

time

1 mn
10 s

1s

rated load
power
0.3 s
1.1 1.3 1.5 1.7 1.9 2 P (kw)

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 Comet 40-150kVA

3.6 Emergency Shutdown Using EPO/REPO

CAUTION Pressing the “Emergency Power Off” (EPO) or “Remote Emergency Power Off”
(REPO) pushbutton disconnects the attached load. The EPO is to be used during
emergency situations only, where a hazard to personnel or equipment exists, such
as during a fire. DO NOT USE THE EPO TO TURN THE UPS ON OR OFF.

Follow the procedures listed in this section for turning the Inverter on and off.

During an emergency situation, such as a fire in the computer or electrical room, the UPS and all downstream
devices can be instantly shut down by pressing the EPO pushbutton on the front panel of the UPS cabinet, or
by pressing the "Remote Emergency Power Off" (REPO) optional pushbutton.

The EPO or REPO pushbuttons should not be used for normal shutdown of the equipment.

If the EPO pushbutton has been pressed, it must be reset by pressing it again and by pressing the "Fault Reset"
key on the front panel to allow the UPS to restart.

3.7 Forced Transfer

CAUTION Using the forced transfer functions will cause the load to experience a power
interruption for a minimum of 500 milliseconds. Be certain that the load can
tolerate this interruption.

Forced transfer is required if bypass input is out of tolerance. The load can be transferred from the Inverter
output to the bypass input source, or back, with a power interruption of 500 milliseconds.

Transferring the Load to Bypass Input From Inverter

On the front panel, press the "Security" key and hold it while pressing the gray "Inverter OFF" pushbutton for 3
seconds.

Transferring the Load to Inverter From Bypass Input

On the front panel, press the "Security" key and hold it while pressing the green "Inverter ON" pushbutton for 3
seconds.

3.8 Maintenance Bypass

This procedure assumes that the UPS is operating normally, with the attached load supplied via the Inverter.

3.8.1 From Normal Maintenance Bypass Mode

1. Stop the Inverter by pressing the gray "Inverter OFF" pushbutton on the UPS front panel for approximately three
(3) seconds. The audible alarm will sound; silence the alarm by pressing the "Buzzer Reset" pushbutton. If the
transfer conditions are not satisfied (bypass out of tolerance or other reason), a forced transfer will be required.
Refer to the "Forced Transfers" section for more information.

2. Switch the battery circuit breaker QF1 to the "OFF" position.

NOTE The battery circuit breaker QF1 will automatically trip open if left in the “ON”
position when the UPS is placed in the Maintenance Bypass mode.

3. Turn the manual bypass switch to the "TRANSFER" position, then to the "BYPASS" position.

4. All indicating LED's go off.

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 Installation and User Manual

NOTE The cooling fans will remain operational when the UPS is placed on
Maintenance Bypass mode to prevent the optional input/output transformers
inside the UPS from overheating. If it is necessary to de-energize the fans,
move the fan control switch (SR2) to the “OFF” position.

CAUTION In this mode of operation, the UPS is ready for maintenance, but voltage is
still present on terminal blocks and various internal components.

Now the UPS is ready for maintenance.

3.8.2 From Maintenance Bypass to Normal Mode

WARNING Failure to follow the proper Startup sequence will result in load loss. After
SR1 is set to “TRANSFER,” it takes the UPS five (5) to six (6) \seconds to test
the input power before turning on the “Static Switch”. During this time, the
load is still supplied by the Maintenance Bypass line, and moving SR1 to
“NORMAL” will result in interruption of power to the load.

1. Move the fan control switch (SR2) to the “ON” position if the cooling fans were de-energized during
maintenance.

2. Turn the manual bypass switch SR1 to the "TRANSFER" position.

3. Wait for the GUI display to go on (at least 5 seconds).

4. Turn the Inverter off by pressing the gray "Inverter OFF" pushbutton on the front panel for approximately
3 seconds if your Comet has been programmed to automatically restart.

CAUTION ALWAYS turn the Inverter off before rotating the Manual Bypass Switch (SR1).

5. Close the battery disconnect circuit breaker(s) QF1.

6. Turn the manual bypass switch SR1 to the "NORMAL" position.

7. Turn the Inverter on by pressing the green “Inverter ON" pushbutton on the front panel. If the transfer
conditions are not satisfied (bypass out of tolerance or other reason), a forced transfer will be required.
Refer to the "Forced Transfers" section for more information.

Now the UPS is in normal operating mode. The green "Load Protected" LED is illuminated on the front panel,
and the operating status of the UPS is provided by the GUI display.

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 Comet 40-150kVA

3.9 Shutdown Procedures

3.9.1 Inverter Shutdown

◗ Press and hold the gray "Inverter OFF" pushbutton for 3 seconds.

◗ The green “Load Protected” LED goes off.

◗ The red “Load Not Protected” LED goes on.

◗ The buzzer sounds.

◗ The Inverter stops if the transfer conditions are correct.

◗ The load is transferred and supplied via the "Static Switch".

3.9.2 Powering Down

It is recommended not to power down the Comet for long periods because the battery should remained charged.
However, to carry out a power down, proceed as follows:

◗ Shut down the Inverter.

◗ Put the battery circuit breaker in the "OFF" position.

◗ Put the upstream main circuit breaker in the "OFF" position.

◗ All the indicating LED's on the control panel go off.

3.10 Alarms

Any state other than normal operation (green “Load Protected” LED on) is considered a fault by the diagnostics
system.

Before undertaking any servicing or other action, note the status of the different LED's and the GUI messages
displayed on the panel.

If an alarm is present and the load still functions, it is supplied via the "Static Switch", i.e. it is not protected.

Table 3-1: Alarm Indications.

status or action producing the indication

inverter start-up phase prior to load

transfer. The "inverter on" button has
been pressed.
normal operation;
load supplied by Comet UPS
(SR1 in normal position)
beep inverter shutdown following pressing of the
beep
"inverter off" button or a major fault;
load supplied via the "static switch"
beep
beep operation on battery power;
load supplied by Comet UPS
beep
beep end of battery power or battery should be
checked
beep
beep minor fault;
(load continues to be supplied via inverter)

UPS shutdown;
load supplied via maintenance bypass

Legend of alarm indications table:

buzzer off,

light off,
beep
beep
buzzer on,

light on,

light flashing

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 Maintenance

4.0 Scope

Preventive maintenance and battery safety instructions for Comet 40-150kVA UPS, and information about
replacement parts, and customer service.

4.1 Battery Safety

IMPORTANT SAFETY INSTRUCTIONS FOR SERVICING BATTERIES

A. Servicing of batteries should be performed or supervised by personnel knowledgeable with batteries and
the required precautions. Keep unauthorized personnel away from batteries.

B. When replacing batteries, use the same model and manufacturer of batteries.

C. CAUTION — Do not dispose of battery or batteries in a fire. The battery may explode.

D. CAUTION — Do not open or mutilate the battery or batteries. Released electrolyte is harmful to the skin
and eyes. It may be toxic.

E. CAUTION — A battery can present a risk of electrical shock and high short-circuit current. The following
precautions should be observed when working with batteries:

1. Remove watches, rings, or other metal objects.

2. Use tools with insulated handles.

3. Wear rubber gloves and boots.

4. Do not lay tools or metal parts on top of batteries.

5. Disconnect charging source prior to connecting or disconnecting battery terminals.

6. Determine if ground faults exists. If so, remove the source of ground. Contact with any part of a grounded
battery can result in electrical shock. The likelihood of such shock will be reduced if such grounds are
removed during installation and maintenance.

4.2 Preventive Maintenance

The following preventive maintenance routines should be considered the minimum requirements; your
installation and site may require additional preventive maintenance to assure optimal performance from your
installed Comet UPS and associated equipment. These routines should be performed twice a year (more often
if required). We strongly recommend contracting MGE Customer Support Services for preventive and remedial
maintenance at 1-800-438-7373.

The technician or electrician performing preventive maintenance on the UPS must be familiar with the
indicators, controls, and operation of the UPS.

a. Isolate and de-energize all Comet UPS equipment for all maintenance operations. Lock and tag all upstream
circuit breaker(s) during maintenance.

b. Ensure that all equipment is clean and free of dust, dirt, and debris. The exterior of the UPS enclosure may
be cleaned with a mild solution of soap and water, lightly applied with a lint-free cloth.

c. Clean/replace the air intake filters, exhaust plates, and the enclosure interior with a vacuum cleaner.

d. Initiate the startup procedure, as described in Section 3.

e. Test the main operating sequences as applicable to your installation (see Section 3).

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 Comet 40-150kVA

4.3 Replacement Parts

There are no user serviceable parts inside the Comet UPS.

Three levels of replacement parts are available for the Comet. The three levels are designated A, B, and C. The
level that you should keep on hand for your installation will vary depending on the type of maintenance planned
on site, and the configuration of your UPS system.

Having the replacement parts on hand will prevent any unacceptable delays (because of time involved obtaining
spares) during critical periods, such as system startup. Any items used during start-up will be replaced by MGE
at no charge. Contact MGE Customer Care Center at 1-800-438-7373 for specific recommendations.

A description of each level is provided below:

Level Description

A This level of replacement parts consists of consumable items, specifically power and control fuses.
It is recommended to have these items on hand during installation of the UPS systems, including initial startup.

B This level of replacement parts is recommended when the user can tolerate short-duration UPS down-time
to obtain replacement parts in the event of a major UPS failure. This level of replacement parts consists of
consumable items, specifically power and control fuses, fans, and the most critical circuit board assemblies.

C This level of replacement parts is recommended when the user can tolerate only a minimum of down-time in
the event of a major UPS failure. This level of replacement parts consists of consumable items, specifically
power and control fuses, fans, and a significant set of circuit board assemblies.

4 —2 Maintenance 86-160310-00 E00

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 MGE Warranty & Proprietary Rights Statement for Three Phase Products
(Applicable within the United States, Canada and Mexico)

MGE Standard Three Phase Warranty

MGE UPS SYSTEMS, INC. (“MGE”) warrants three phase products it manufactures to be free from defects in
materials and workmanship for a period of three hundred sixty five (365) days counting from the date of purchase by
or for the first end user (“Purchaser”), or, if applicable, the date of MGE’s completion of initial startup of the subject
product, provided however said warranty shall not exceed eighteen (18) months from the date of delivery of the
subject product to Purchaser (the “Warranty Period”). MGE’s liability hereunder is limited to replacing or repairing at
MGE’s factory or on the job site, at MGE’s option, any part or parts that are defective and reported to MGE during
the Warranty Period. MGE shall have the sole right to determine if the parts are to be repaired at the job site or
whether they are to be returned to the factory for repair or replacement. All items returned to MGE for repair or
replacement must be sent freight prepaid to its factory. Purchaser must obtain MGE’s Return Goods Authorization
(“RGA”) prior to returning items. The conditions stated herein must be met for MGE’s warranty to be valid. MGE will
not be liable for any damage done by unauthorized repair work, unauthorized replacement parts, from any misappli-
cation of the subject product, for damage due to accident, abuse, or act of God (such as earthquake, flood, inclement
weather, rain or fire), or relating to Purchaser’s failure to follow proper environmental conditions for the product.

In no event shall MGE be liable for loss, damage, or expense directly or indirectly arising from the use of or any
defects in the subject product, or from any other cause, except as expressly stated in this warranty. EXCEPT AS
EXPRESSLY STATED IN THIS WARRANTY, MGE UPS SYSTEMS, INC. MAKES NO WARRANTIES, EXPRESS OR
IMPLIED, INCLUDING ANY WARRANTY AS TO MERCHANTABILITY OR FITNESS FOR A PARTICULAR
PURPOSE OR USE OR NON-INFRINGEMENT. MGE is not liable for and Purchaser waives any right of action it
has or may have against MGE for any consequential or special damages arising out of any breach of warranty, and
for any damages Purchaser may claim for damage to any property or injury or death to any person arising out of its
purchase or the use, operation or maintenance of the subject product. The warranty stated herein includes parts and
labor; however, MGE will not be liable for any labor subcontracted or performed by Purchaser for preparation of the
warranted item for return to MGE’s factory or for preparation work for field repair or replacement, and MGE will not
be responsible to pay any invoice therefore.

This warranty shall be exclusive of any and all other warranties express or implied and may be modified only by a
writing signed by an authorized officer of MGE UPS SYSTEMS, INC. This warranty shall extend to the Purchaser
but to no one else. Accessories supplied by MGE, but manufactured by others, carry any warranty the manufactur-
ers have made to MGE, and which can be passed on to Purchaser.

MGE UPS SYSTEMS, INC. makes no warranty with respect to whether the products sold hereunder infringe any
patent, U.S. or foreign, and Purchaser represents that any specially ordered products do not infringe any patent.
Purchaser agrees to indemnify and hold MGE UPS SYSTEMS, INC. harmless from any liability by virtue of any
patent claims where Purchaser has ordered a product conforming to Purchaser’s specifications, or conforming to
Purchaser’s specific design.

Purchaser has not relied and shall not rely on any oral representation regarding any products sold hereunder and
any oral representation shall not bind MGE UPS SYSTEMS, INC. and shall not be part of any warranty.

There are no warranties which extend beyond the description on the face hereof. In no event shall MGE UPS
SYSTEMS, INC. be responsible for consequential damages or for any other damages except as expressly stated
herein.

Proprietary Rights Statement

The information in this manual is the property of MGE UPS SYSTEMS, INC., and represents a proprietary article in
which MGE UPS SYSTEMS, INC. retains any and all intellectual property rights, including exclusive rights of use
and/or manufacture and/or sale. Possession of this information does not convey any permission to reproduce,
print, manufacture or have made the article or articles shown herein. Such permission may be granted only by
specific written authorization signed by an authorized officer of MGE UPS SYSTEMS, INC.

IBM, PC-AT, ES/9000, and AS/400 are trademarks of International Business Machines Corporation. MGE and
MGE UPS SYSTEMS are trademarks of MGE UPS SYSTEMS, INC. Other trademarks that may be used herein
are owned by their respective companies and are referred to in an editorial fashion only.

For Three Phase Warranty outside of the United States, Canada and Mexico, refer to Three Phase International
Warranty.

January 2005 Rev C00

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 Warranty and Product Registration

Thank you for choosing MGE UPS SYSTEMS, INC. for your power protection, distribution, and quality
requirements. We are pleased to have you join our increasing family of users.
In order to maximize the value you receive from this product, and to ensure that you are kept informed of
product or software updates, we recommend that you take a few minutes to register your new purchase.
You may register online at the URL noted below. Should you not have Internet access, you may mail or fax
this form back (attn: Warranty Registration) as indicated at the bottom of the page.
Register your product at: http://www.mgeups.com/email/warranty/menu.htm
Please be prepared with the following information to register and validate your product’s warranty, keep
informed on software and product updates, and register your extension "Warranty+" if purchased with the
product.
User Information
Last name ________________________________________
First name ________________________________________
Company name ________________________________________
Address ________________________________________
Zip code ________________________________________
City ________________________________________
State/Province ________________________________________
Country ________________________________________
Tel ________________________________________
Fax ________________________________________
Email ________________________________________

Product Information
Model ________________________________________
Serial Number ________________________________________
Date of purchase ________________________________________

Warranty Extension (Warranty+)

I have purchased a warranty extension (Warranty+)

Reference: _____________________ Contract Number: _________________

Thank you from all of us at MGE.

MGE UPS SYSTEMS, INC., 1660 Scenic Avenue, Costa Mesa, CA 92626, USA
Tel: 714-557-1636 Fax: 714-557-9788

41-000154-53 Rev B02 8/2005

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 MGE Customer Care Center - Three Phase Products
Technical Support and Product Services

? Technical questions? If you encounter a problem while following the instructions in this manual, or have
questions about the operation, repair, or servicing of your equipment, please direct calls to MGE UPS SYSTEMS,
INC. Customer Care Center or visit our web site www.mgeups.com for complete service information.

To insure that your questions are correctly answered, please obtain the serial number of the unit and include
them in any discussions or correspondence.

Serial number: _____________________________________________________________________

Who To Contact

Customer Care Center: 1-800-438-7373 (Hours: 24/7)

Customer FAQ
or International calls: 1-714-557-1636

Commitment: MGE UPS SYSTEMS, INC. is committed to providing easy to access factory trained experts that
will provide responses to any questions that you might have.

Scheduling Field Service Engineer Support

Scheduling of the MGE Field Service Engineers typically should be done 7 to 10 days before they are required
on-site. If the startup of the product is critical to maintaining your schedule, please call the MGE toll free
telephone number at 1-800-438-7373 for assistance.

Return Policy for Repair of Three Phase Products (RGA)

Should you require factory service for your equipment, contact MGE Customer Care Center and obtain a Return
Goods Authorization (RGA) prior to shipping your unit. Never ship equipment to MGE without first obtaining an RGA
number.

Date: ______________________________________________________
RGA Number: ______________________________________________________
Contact Name: ______________________________________________________

Rev B00 8/2005

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 Glossary

Term used Definition / Meaning

@ At.

/ And/or.

+/- Plus or Minus.

≤ Equal to or less than.

# Number.

°C Degree Celsius.

°F Degree Fahrenheit.

Ø Phase angle.

Ω Ohm; unit of resistance.

® Trade Mark.

2nd Second.

AC or ac Alternating current, also implies root-mean-square (rms).

Ambient Temp. Temperature of surrounding air.

Ambient noise Acoustical noise of surrounding environment.

ANSI American National Standard Institute.

AWG American Wire Gauge.

Breaker Electrical circuit interrupter.

BTU or Btu British thermal unit. Defined as the amount of heat required to raise the tempera-
ture of one pound of water by 1°F.
BYPASS See “Static Transfer switch”.

BYPASS mode See “off-line mode”.

Carrier The company or individual responsible for delivering goods from one location to another.

C Common.

CB Circuit breaker.

cm Centimeter.
CSA Canadian Standards Association.
dB Decibels.
DC Direct current.
Conduit A flexible or rigid tube enclosing electrical conductors.

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 Comet 40-150kVA

C.S.S. Customer Support Service.

Current rating The maximum current that a conductor or equipment can carry reliably without damage.

dBA Decibel Adjusted.

dBrnC Decibel above reference noise.

DC or dc Direct current, or voltage.

Digital Meter The LCD display on the front panel of inverter system.

Earth ground A ground circuit that has contact with the earth.

ECO Mode Operating mode by which the load is supplied directly by the AC source if it is within the
tolerances defined by the user. This mode reduces the consumption of electrical power.

Electrician Refers to an installation electrician qualified to install heavy-duty electrical components in

accordance with local codes and regulations. Not necessarily qualified to maintain or repair
electrical or electronic equipment.

FCC Federal Communications Commission.

FET Field effect transistor.
Freq. Frequency.

Frequency slew rate The change in frequency per unit of time. Given in term of Hz per second (Hz/sec.).

GND Ground (safety).

Hz Hertz, frequency measurement unit, 1Hz is one cycle per second.

Inverter mode See “on-line” mode.

I Current.

IEC International Electrotechnical Commission.

IEEE Institute of Electrical and Electronic Engineers.

Input branch circuit The input circuit from the building power panel to the equipment.

Inverter An electrical circuit that generates an AC voltage source from a DC voltage source.

IGBT Insulated gate bipolar transistors.

I/O Input/Output.

I/T or IT Information Technology.

kVA KiloVolt-Ampere; is equal to 1000 Volt-Ampere.

L Line.

LCD Liquid-Crystal Display unit.

LED Light Emitting Diode.

Mains or Mains 1 Main AC input source.

Mains 2 Bypass AC input source.

mA Milliampere.

MAX. Maximum.

MCM Thousand circular mil; standard wire sizes for multiple stranded conductors over 4/0 AWG in
diameter. M is from Roman numerical system indicating 1000.

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 Installation and User Manual

Module Refers to individual power inverter module.

N Neutral.

NC Normally closed.

NO Normally open.

NEC National Electrical Code.

NEMA National Electrical Manufacturers Association.

NFPA National Fire Protection Association.

PF Power factor.
PN Part number.

On-line mode Inverter output power is the primary energy source to load.

Off-line mode Inverter output is off, and the load connected at the inverter output receives power
from utility line via a static transfer switch or maintenance bypass relay.

OSHA Occupational Safety and Health Agency.

PCA Printed circuit assembly.

PCB Printed circuit board.
PWM Pulse Width Modulation.
SCR Silicon controlled rectifier.

Shipping damage Any damage done to an article while it is in transit.

SPDT Single Pole Double Throw.

Static Transfer An solid state switching mechanism electronically controlled to pass AC power
directly from the utility to an output load.

Technician Refers to an electronic technician qualified to maintain and repair electronic

equipment. Not necessarily qualified to install electrical wiring.

Test connector DB-9 type connector on the LCD panel allowing MGE UPS SYSTEMS Customer
Support Service technician to access programmable and diagnostic features of the
system.

UL Underwriter's Laboratories, Inc.

UPS Uninterruptible Power Supply or Uninterruptible Power System.

V Volts
VA Volt amperes
VA Volt-amps, unit for apparent power measurement, equal V x I.

VAC or Vac Voltage of AC type.

VDC or Vdc Voltage of DC type.

ve Battery voltage.
Via By way of.

86-160310-00 E00 Glossary G—3

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 Reorder Form

1660 Scenic Avenue

Costa Mesa, CA 92626

Use this form to report any errors, omissions, or other problems you have experienced, or to order additional
hardcopies of this document. A free copy of this document may be downloaded from the proprietary MGE Rep Web
site. Please contact your MGE UPS SYSTEMS, INC. Representative for assistance.

NAME ____________________________________________________________________________________

COMPANY _________________________________________________________________________________

STREET ADDRESS ___________________________________________________________________________

CITY ________________________________________ STATE __________________ ZIP __________________

I would like to order______ (quantity @ $75.00 each) additional copies of the:

Comet 40-150kVA

Installation and User Manual

86-160310-00 E00

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 w w w. m g e u p s . c o m

Contact MGE
United States
MGE UPS SYSTEMS
1660 Scenic Ave.
Costa Mesa, CA 92626

Tel: (714) 557-1636

CCC: (800) 438-7373
Fax: (714) 557-9788
email: info@mgeups.com
www: mgeups.com

Canada
MGE UPS SYSTEMS
#9, 2789 Thamesgate Drive
Mississauga, ON L4T 4E8

Tel: (905) 672-0990

(877) 672-0990
Fax: (905) 672-7667
email: info@mgeups.com
www: mgeups.com

Latin America and

Other International

MGE UPS SYSTEMS

1660 Scenic Ave.
Costa Mesa, CA 92626

Tel: (714) 513-7831

Fax: (714) 434-0199
email: info@mgeups.com
www: mgeups.com

1660 Scenic Avenue, Costa Mesa, California 92626 • (714) 557-1636

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