MGE UPS Systems Epsilon STS 200A User manual

Epsilon STSTM
200A and 400A/600A
Static Transfer Switch
Installation and User Manual
86-504004-00 B03
www.mgeups.com
Standard Features
◗Epsilon 200A System
◗Epsilon 400A/600A
System

Installation and User Manual
Chaptername i86-504004-00 B03
Epsilon STSTM
200A and 400A/600A
Static Transfer Switch
Installation and User manual
Revision History
Epsilon STS 200A and 400A/600A STS, Installation and User Manual 86-12345-00 B02
Revision: A00 Initial Release 06/2002
B00 ECN: 002866 09/2002
B01 ECN:#003777 03/2004
B02 ECN:#004471 07/2005
B03 ECN:#004991 10/2006
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
[phone]
Technical Support:
1-800- 523-0142 (during business hours)
Customer Care Center:
1-800-438-7373 (Hours: 24/7)

Epilson STSTM
ii 86-504004-00 B03
IMPORTANT SAFETY INSTRUCTIONS
SAVE THESE INSTRUCTIONS – This manual contains important instructions for the Epsilon STSTM that must be
followed during operation 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 confirmation 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 verlan-
gen 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 interference 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.
Certification Standards
◗IEEE 587-1980/ANSI C62.41 for Cat. B3, 1980 Standards for Surge Withstand Ability
◗FCC rules and regulations of Part 15, Subpart J, Class A , EN50081-2 (use shielded cables)
◗UL listed under 1008, Standards for Transfer Switch Equipment.
◗NEMA PE 1 (National Electrical Manufacturers Association) - Uninterruptible Power Systems
◗NEMA 250 (National Electrical Manufacturers Association)
– Enclosures for Electrical Equipment (1000 Volts Maximum)
◗NFPA 70 – National Electrical Code
◗ISO 9001 Quality Assurance, NEC, ANSI, NEMA, NFPA, IEEE.
◗Occupational Safety & Health Administration (OSHA)
Important Safety Information and Standards

Installation and User Manual
iii86-504004-00 B03 How To Use This Manual and Symbol Usage
WARNING To reduce the risk of fire or electric shock, install in a temperature and
humidity controlled indoor area free of conductive contaminant’s.
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
contaminant’s conducteurs.
Ce matériel est destiné seulement pour des installations dans un
EMPLACEMENT RESTREINT d'accès.
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 eingeschränkter Zugangserlaubnis
vorgesehen.
Diese Ausrüstung ist nur für Anlagen in einem EINGESCHRäNKTEN
ZUGRIFF STANDORT bestimmti.
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.
How to use this manual and Symbol Usage
This manual is designed for ease of use and easy location of information.
This manual uses four icon symbols with text to convey important information and tips.
WARNING Indicates information provided to protect the user and service personnel against safety
hazards and/or possible equipment damage.
CAUTION Indicates information provided to protect the user and service personnel against possible
equipment damage.
IMPORTANT Indicates information provided as an operating instruction, or as an operating tip.
NOTE Indicates information provided as an operating tip or an equipment feature.

Epilson STSTM
iv 86-504004-00 B03CAUTION: Record All Serial Numbers
CAUTION: Record All Serial Numbers!
RECORD ALL SERIAL NUMBERS FOR THE Epilson STSTM AND COMPONENTS.
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: _______________________________________________________
MODULE SERIAL NUMBER: ____________________________________________________
BATTERY SERIAL NUMBER: ___________________________________________________
ADDITIONAL MODULES SERIAL NUMBERS:
____________________________ ______________________________
____________________________ ______________________________
____________________________ ______________________________
____________________________ ______________________________
____________________________ ______________________________
____________________________ ______________________________
____________________________ ______________________________
____________________________ ______________________________
____________________________ ______________________________
____________________________ ______________________________

Contents
Contents
c i86-504004-00 B03
section description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .page
Revision History . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .i
IMPORTANT SAFETY INSTRUCTIONS . . . . . . . . . . . . . . . . . . . . . . .ii
Certification Standards . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .ii
How to use this manual and Symbol Usage . . . . . . . . . . . . . . . . . . . .iii
CAUTION: Record All Serial Numbers! . . . . . . . . . . . . . . . . . . . . . . .iv
Quick Start
section description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .page
First steps by an on-site qualified Technical Engineer . . . . . . . . . . . . .QS —1
Required Equipment and Tools . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .QS —1
Step 1 Unpacking . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .QS —2
Step 2 Connection of Utility Power Inputs . . . . . . . . . . . . . . . . . . . . .QS —4
Connect Input Power from Two Sources . . . . . . . . . . . . . . . .QS —4
Step 3 Connection of the Load Outputs . . . . . . . . . . . . . . . . . . . . . .QS —4
Step 4 Call MGE UPS Systems for Field Engineer Service . . . . . .QS —5
Step 5 Arrival of MGE Field Engineer . . . . . . . . . . . . . . . . . . . . . . . .QS —5
Optional Steps . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .QS —6
Section 1 Introduction
section description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .page
1.0 Scope . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1 — 1
1.1 Reference Manuals . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1 — 1
1.2 Section Descriptions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1 — 1
1.3 General Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1 — 2
1.4 Epsilon STSTM System Characteristics . . . . . . . . . . . . . . . . . . .1 — 3
1.4.1 PMM2 Plus and PMM2 Ultra . . . . . . . . . . . . . . . . . . . . . . . . . . . .1 — 4
1.5 System Major Components . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1 — 5
1.6 Single Line Diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1 — 7
1.7 System Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1 — 8
1.7.1 Electrical Electrical Characteristics . . . . . . . . . . . . . . . . . . . . . . .1 — 8
1.7.2 Electrical Cable Access and Connections . . . . . . . . . . . . . . . . . .1 — 9
1.7.3 Connecting Power Cables . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1 — 9
1.7.4 Accessing Electrical Connections . . . . . . . . . . . . . . . . . . . . . . .1 — 10

Epilson STSTM
Contentsc ii 86-504004-00 B03
Section 2 Setup and Installation
section description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .page
2.0 Scope . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2 — 1
First steps by an on-site qualified Technical Engineer . . . . . . . .2 — 1
Final steps by MGE Field Service Engineer . . . . . . . . . . . . . . . .2 — 1
Required Equipment and Tools . . . . . . . . . . . . . . . . . . . . . . . . . .2 — 1
2.1 Cabinet Placement and Environment . . . . . . . . . . . . . . . . . . . . .2 — 2
2.2 Clearances and FootPrint . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2 — 2
2.2.1 Conduit Plate Location (bottom entry) . . . . . . . . . . . . . . . . . . . . .2 — 3
2.3 Source #1 AC Input Connections . . . . . . . . . . . . . . . . . . . . . . . .2 — 3
2.3.1. Source #2 AC Input Connections . . . . . . . . . . . . . . . . . . . . . . . .2 — 3
2.3.2 AC Output Connections . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2 — 3
2.3.3 Remote Emergency Power Off (REPO) Cable Connections . . .2 — 4
2.3.4 Remote Source Loss Test Cable Connections . . . . . . . . . . . . . .2 — 4
2.3.5 Connection of the Relay Communication Card . . . . . . . . . . . . . .2 — 5
2.3.6 Characteristics of the Output Contacts . . . . . . . . . . . . . . . . . . . .2 — 6
2.3.7 Characteristics of the Input Contacts . . . . . . . . . . . . . . . . . . . . .2 — 6
2.3.8 Removing the Communications Card Cover . . . . . . . . . . . . . . . .2 — 7
2.3.9 Replacing the Cover . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2 — 7
2.4 Setting Operation Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2 — 8
2.5 Setting the Output Relay Contacts and Inputs Switching States 2 — 9
2.5.1 Connection of the JBUS Communication Card . . . . . . . . . . . . .2 — 10
2.6 Check Points Before and After Start Up . . . . . . . . . . . . . . . . . .2 — 10
2.6.1 Pre-Start Up Safety Check List . . . . . . . . . . . . . . . . . . . . . . . .2 — 10
2.6.2 Post-Start Up Safety Check List . . . . . . . . . . . . . . . . . . . . . . . .2 — 10
Section 3 Operation
section description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .page
3.0 Scope . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3 —1
3.1 Preparation for Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3 —1
3.2 Pre-Start Up Safety Check List . . . . . . . . . . . . . . . . . . . . . . . . . .3 —1
3.2.1 Normal Start Up Procedure . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3 —2
3.2.2 Post Start Up Safety Check List . . . . . . . . . . . . . . . . . . . . . . . . . .3 —3
3.2.3 Shutdown Procedure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3 —3
3.3 Transfer Operations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3 —4
3.3.1 Automatic Transfers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3 —4
3.3.2 Manual Transfers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3 —4
3.3.3 Automatic Retransfers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3 —4
3.3.4 Transfer Authorization/Prohibition . . . . . . . . . . . . . . . . . . . . . . . . .3 —5
3.4 Maintenance Bypass/Molded Case Switches/Live System Test .3 —5
3.4.1 Switch Arrangement . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3 —5
3.4.2 Electrical Bypass Switch Interlock . . . . . . . . . . . . . . . . . . . . . . . .3 —5
3.4.3 Electric Input-Bypass Switch Interlock . . . . . . . . . . . . . . . . . . . . .3 —5
3.4.4 Mechanical Key Interlocks . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3 —5
3.4.5 Live System Test (Except with 4-Interlock System) . . . . . . . . . . .3 —6

Installation and User Manual
Section 3 Operation (continued)
section description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .page
3.4.6 EPO . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3 —6
3.5 Preferred Source Selection (Symmetrical Operation) . . . . . . . . .3 —6
3.6 Sensing and Transfer Times . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3 —6
3.7 Overload Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3 —6
3.8 Shorted SCR Protection (including Backfeed Protection) . . . . . .3 —6
3.9 Open SCR Protection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3 —7
3.10 Source Cross-Connection Protection . . . . . . . . . . . . . . . . . . . . . .3 —7
3.11 Bypass Procedure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3 —7
3.12 Front Panel . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3 —9
3.13 Front Display Interface Panel . . . . . . . . . . . . . . . . . . . . . . . . . . .3 —10
3.14 Operator Interface Screens . . . . . . . . . . . . . . . . . . . . . . . . . . . .3 —14
3.15 Epsilon STS™ Customization . . . . . . . . . . . . . . . . . . . . . . . . . .3 —15
Glossary
Reorder Form
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 - Single Phase Products
Technical Support and Product Services
Who to Contact
Scheduling Field Service Engineer Support
Return Policy for Repair of ThreePhase Products (RGA)
Contents c iii86-504004-00 B03

Figures
figure description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .page
QS-1 Positioning of 200A Epsilon STS™. . . . . . . . . . . . . . . . . . . . . .QS —2
QS-2 Positioning of 400/600A Epsilon STS™ . . . . . . . . . . . . . . . . . .QS —3
QS-3 200A STS Input/Output Power Connections. . . . . . . . . . . . . . .QS —4
QS-4 400/600A STS Input/Output Power Connections. . . . . . . . . . . .QS —5
QS-5a 200A STS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .QS —6
QS-5b 400/600A STS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .QS —6
1-1a: Epsilon STS™ - 200A Cabinet. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1 — 2
1-1b: Epsilon STS™ - 400/600A Cabinet. . . . . . . . . . . . . . . . . . . . . . . . . . . . .1 — 2
1-2: PMM2 and PMM2 Ultra Cabinets. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1 — 4
1-3: Operator Input Display. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1 — 6
1-4: Single Line Diagram, Epsilon STSTM with Options. . . . . . . . . . . . . . . . .1 — 7
1-5: 200A STS Power and Control Wire Connections. . . . . . . . . . . . . . . . .1 — 10
1-6: 400/600 STS Power and Control Wire Connections. . . . . . . . . . . . . . .1 — 11
2-1: 200STS and 400/600A STS Cabinet Clearances. . . . . . . . . . . . . . . . . .2 — 2
2-2: 200A /400/600A STS Cabinet Footprint and Top View. . . . . . . . . . . . . .2 — 3
2-3: Control Connections . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2 — 4
2-4: Output Contacts. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2 — 6
2-5: Removing the Communications Card Cover. . . . . . . . . . . . . . . . . . . . . .2 — 7
2-6: Removing the Communications Card Cover. . . . . . . . . . . . . . . . . . . . . .2 — 7
2-7: SA2 and Dip switch location on communication card. . . . . . . . . . . . . . .2 — 8
2-8: JBUS Communication Card. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2 — 10
3-1: Front Display Interface Panel. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3 —10
3-2: LCD Normal Operation Screen . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3 —11
3-3: Manual Operation Pushbuttons . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3 —12
3-4: LED Mimic Diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3 —13
3-5: LCD Display Screens. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3 —14
3-6: Customization Screen. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3 —15
Tables
table description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .page
1-1: Input/Output Power Connections. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1 — 10
1-2: Input/Output Power Connections. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1 — 11
2-1: Heat Rejection Data and Rated Current. . . . . . . . . . . . . . . . . . . . . . . . .2 — 2
2-2: Relay Contacts (communications card) . . . . . . . . . . . . . . . . . . . . . . . . .2 — 5
3-1: Customization Settings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3 —15
Epilson STSTM
Contentsc iv 86-504004-00 B03

Quick Start QS —186-504004-00 B03
On-Site Quick Start
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 UPS is critical to maintaining your schedule, please call the
MGE toll free telephone number at 1-800-438-7373 for assistance.
Final installation and start-up should be completed by a qualified MGE Field Service Engineer.
This On-site Quick Start will guide qualified engineers through unpacking and positioning the unit, the equipment,
tools, and steps required to perform power input/output connections to prepare the unit for MGE Field Service
Engineers to perform on-site final installation and startup.
To insure a successful installation, each of these (4) steps should be followed in their correct sequence.
Note that any unauthorized installation may cause damage to the UPS(s) and void the MGE warranty.
First steps by an on-site qualified Technical Engineer
Step 1. Unpack and position the unit
Step 2. Connect the main (utility) power
Step 3. Connect the output to the power distribution panel
Step 4. The MGE Field Service Engineer finalizes installation and the startup process.
Optional : Procedure for temporary power prior to the final startup.
Required Equipment and Tools
The following equipment and tools are recommended for on-site installation:
◗Digital volt meter (DVM)
◗1/8 inch slotted screwdriver
◗Pallet jack/forklift
◗Conduit installation tools
◗Nut driver set

Step 1 Unpacking
Once the Epsilon STSTM UPS System has been inspected and received from the shipping courier, the unit should
be moved with the use of a fork lift or pallet jack to a position as close to the final installation location as possible.
Prior to any installation, the following items should be observed upon receipt of the Epsilon STSTM 10-30 kVA UPS.
1. Inspect shipment for any damage prior to receipt. Damage claims should be filed directly with the courier.
Replacements for damaged components should be ordered through MGE Customer Support Services at 1-800-
438-7373.
2. Remove wrapping and foam corners to verify that the equipment nameplate (located on the inside door of the
cabinet) details a system that corresponds with the equipment ordered. See Figure QS-1.
3. The casters on the unit will allow it to be positioned into the final installation location. At this point, the
leveling legs can be adjusted to provide a level and stable footing for the Epsilon STS™ system.
Figure QS-1 Positioning of 200A Epsilon STS™.
Epilson STSTM
Quick StartQS —2 86-504004-00 B03
CASTERS
LEVELING
JACKS
OPTIONAL SEISMIC
BRACKETS
SECURED USING 3/8 BOLT

Installation and User Manual
Figure QS-2 Positioning of 400/600A Epsilon STS™
Quick Start QS —386-504004-00 B03
CASTERS
LEVELING
JACKS
OPTIONAL SEISMIC
BRACKETS
SECURED USING 3/8 BOLT

Step 2 Connection of Utility Power Inputs
Connect Input Power from Two Sources
The Epsilon STS™ systems provides for either top or bottom cable entry. Connections are to be made with 75°C
copper wire cables and using the lugs supplied with the STS unit. Refer to section 2.0 Installation and/or the system
installation drawing(s) for more details (such as cable size and number of conductors).
NOTE: Three phase input power supplied as a Wye must have a
separate, solidly
grounded neutral that will be connected to the STS
neutral busbar. If neutral is not supplied or not required for the load,
connect only three phases and ground.
It is recommended to use isolation transformers so that the neutral of
both AC sources can be grounded to the same potential.
Step 3 Connection of the Load Outputs
The Epsilon STS™ system provides for either top or bottom cable entry. Connections are to be made with 75°C
copper wire cables and using the lugs supplied with the STS unit. Refer to section 2.0 Installation and/or the system
installation drawing(s) for more details (such as cable size and number of conductors).
NOTE: Input and output cables inside the STS cabinet must be braced at 12”
intervals
as shown in Figures QS-3 and QS-4.
For Control Wiring connections refer to section 2.0 Installation.
Figure QS-3 200A STS Input/Output Power Connections.
Epilson STSTM
Quick startQS —4 86-504004-00 B03
COMMUNICATION
CARDS
TB1
TERMINAL
CONTROL WIRES
THREADED THROUGH
PANDUIT/WIRE-WAYS
TOP ENTRY
CONDUIT PLATE
CONTROL
WIRES
BRACE AT
12" INTERVALS
BOTTOM ENTRY
CONDUIT PLATE
CONTROL WIRE
PANDUIT/WIRE-WAYS

Installation and User Manual
Figure QS-4 400/600A STS Input/Output Power Connections.
Step 4 Arrival of MGE Field Engineer
The MGE Field Engineer will finalize the initial Epsilon STS™ start-up. To insure a successful installation and
reliable STS service, the MGE Field Engineer will verify all of the installation connections, fusing, and then will
examine the extensive set of
Epsilon STS™ personalization parameters to insure that the operation of the STS
exactly matches your installation requirements.
Quick start QS —586-504004-00 B03
CONTROL WIRES
THREADED THROUGH
UNIT
CONTROL WIRE
PANDUIT/WIRE-WAYS
TOP ENTRY
CONDUIT PLATE
BRACE AT
12" INTERVALS
BOTTOM ENTRY
CONDUIT PAN
COMMUNICATION
CARDS
TB1
TERMINAL
CONTROL WIRES
CONTROL WIRE
PANDUIT/WIRE-WAYS

Optional Steps
Should you require AC power on site prior to the arrival of the MGE Field Engineer, the following procedure will
provide the AC power in the bypass mode. Should you have any questions about this procedure, do not hesitate
to contact MGE Customer Support.
A. Ensure that all switches, CB1-5 in the STS are open (off).
B. Apply input power to the source S1 input of the STS by closing the upstream circuit breaker for source S1. The
STS controls will power up and issues alarm(s). Silence the alarm buzzer by pressing the “Alarm Silence”
pushbutton on the front display panel.
C. Lock CB5 (S2 bypass switch) and remove the lock key (for 4-interlock system, also lock CB2 and remove key).
Using key(s), unlock and close CB4 (S1 bypass switch).
D.
At this point, power will be available for site usage until the STS is properly commissioned.
E. Upon arrival of the MGE Field Service Engineer, the main power must be disconnected so that a safe and
proper commissioning of the unit may be accomplished.
WARNING Do not, under any circumstance, close CB1, CB2, CB3A and
CB3B (if installed) until the unit has been commissioned by an
MGE Field Engineer.
Figure QS-5a 200A STS Figure QS-5b 400/600A STS
Epilson STSTM
Quick startQS —6 86-504004-00 B03
KEY INTERLOCKS
(2 - STANDARD
4 - OPTIONAL)
STS MONITOR
CB1
CB2
CB4
CB5
CB3A
CB3B
STS MONITOR
KEY INTERLOCKS
(2 - STANDARD
4 - OPTIONAL)
CB2
CB5
CB3A
CB3B
CB1
CB4

Introduction
1.0 Scope
Introduction is a general description of system characteristics of Epsilon STSTM, its intended use and applicable
electrical, mechanical and environmental specifications.
1.1 Reference Manuals
160304-00 C00 JBUS/RS232, Installation and User manual.
1.2 Section Descriptions
Quick Start
This Quick Start will guide qualified engineers through unpacking and positioning the unit, the equipment, tools, and
steps required to perform power input/output connections to prepare the unit for MGE Field Service Engineers to
perform on-site final installation and startup.
1 Introduction
Introduction is a general description of system characteristics of Epsilon STSTM, its intended use and applicable
electrical, mechanical and environmental specifications.
2 Setup and Installation
Setup and Installation guides the User through tools and equipment required for making hardwire connections.
Included are power cable connections with wire diagrams for configuring the product to specifications, and
obtaining MGE field service assistance for final installation and startup.
3 Operation
Operation describes Epsilon STSTM system characteristics of indicators and controls, startup and shutdown proce-
dures, safety checklists, modes and specifications and theory of operating the Epsilon STSTM system.
1 — 186-504004-00 B03 Introduction

1.3 General Description
The Epsilon STS™ system is available in two different cabinet sizes . Dimensions for the cabinets are:
◗200A cabinet: 72”H x 24”W x 30”D
◗400A/600A cabinet: 72”H x 38”W x 30”D
Both cabinets are designed to provide for top and/or bottom entry of input and output power feeds.
The Epsilon STS™ system can be purchased to accept 208 VAC, 220 VAC, 240 VAC, 440 VAC, 480 VAC, 575 VAC
or 600 VAC utility feed.
Figure 1-1a: Epsilon STS™ - 200A Cabinet. Figure 1-1b: Epsilon STS™ - 400/600A Cabinet.
Physical Characteristics
Enclosure Type NEMA 1, Free-standing, modular configured with hinged dead front construction
protecting high voltage areas.
Enclosure Dimensions Depth:
30” (System will pass through standard 36” wide door).
Height: 72”.
Width: 24” for 200A STS; 38” for 400A and 600A STS.
Accessibility Front access for operation and maintenance. Front or side access for customer power
connection points.
Power Connections/
All power connections and terminations to be solid copper braced rated for
Busbars 100KAIC. (400/600A models may be a combination of copper busbars and cables).
Cable Entry Top and Bottom.
Mounting 360° Casters and Leveling Jacks with 1” minimum adjustment.
Epilson STSTM
Introduction1 — 2 86-504004-00 B03

Installation and User Manual
1.4 Epsilon STSTM System Characteristics
The Epsilon digital Static Transfer Switch (STS) is a solid state, three-phase, break-before-make, dual position
switch designed to connect a critical three-phase load to one of two separate, independent, synchronized sources
of three-phase power. The STS consists of six pairs of SCR's connected in an AC switch configuration. Each 3-
phase input is fed through a molded case automatic switch which provides short circuit protection by means of a
magnetic trip only. The switch then feeds three pairs of “hockey-puck” SCR's, each pair consisting of two SCR's in
an anti-parallel arrangement. The SCR outputs for each corresponding phase from both inputs are then connected
and fed through an output isolation molded case switch to the output terminals. These SCR's are rated to carry the
full 100% load (continuous rated) while operated as stipulated herein and at the maximum ambient temperature
specified. The source to which the load is normally connected to is designated as the “Preferred” source, and the
other redundant, standby source is the “Alternate” source. Selection of which input source is preferred is user selec-
table from the operator control panel, by control contact inputs, or through the communications port(s).
In normal operation, the load is connected to the preferred source as long as
all phases of the preferred source are
within the acceptable limits. Upon failure
of the preferred source (more degraded than the alternate source), the
load will be transferred to the alternate source until such time as the preferred source returns to within acceptable
limits. The switching action itself is practically instantaneous and the time involved in the operation is mainly the
sensing time required to determine that a transfer is necessary, normally a small fraction of a cycle.
The STS is controlled by a number of system operating variables which define the operation and performance of
the system. Many of these variables may be adjusted for site-specific criteria.
The determination to transfer from one source to the other involves the evaluation of Source Qualities and System
Operating parameters:
Source Quality Concerns the evaluation of a sources ability to support the critical load by evaluating
the voltage, phase, current and frequency of a source on a real time basis.
System Operating Parameters control transfers between the two sources, given the state of both
sources and the load together with the specified site-specific operating criteria.
During a transfer (or re-transfer), the SCR's of the loaded source are turned off and the SCR's of the previously
unloaded source are turned on in such a way as to prevent any cross-current between sources, even if the sources
have large phase displacement. Normally, transfer between sources with large phase difference is not allowed.
The molded case switches with magnetic trips will provide short circuit protection only – overcurrent protection must be
provided by upstream and/or downstream devices.
Triple-redundant control power supplies, independent gate drive circuits for each sources SCR switch and other
design features provide the optimal level of reliability and immunity to single point failures. The Epsilon STS™ is
also built to withstand up to 100KA of available short circuit current.
A Bypassing scheme is provided. This can be used to manually bypass the AC load directly to either of the two
power sources and isolate the static switching for servicing.
The Epsilon STS™ is available in three current ratings – 200A, 400A and 600A (208-600V range). The 200A model
is natural convection cooled. The 400A and 600A models use forced air cooling by fans (with one redundant fan).
The STS is designed for installation in a room where humidity and temperature can be controlled. The recom-
mended and maximum environmental parameters are listed in Appendix B, of this document.
The Epsilon STS™ is listed for safety by Underwriters Laboratories, Inc. (UL) under UL Standard 1008.
Introduction 1 — 386-504004-00 B03

1.4.1 PMM2Plus and PMM2Ultra
In the PMM2Plus configuration, the input of the PMM2cabinet is supplied by the output of the STS. The dual input
distribution system accepts two independent AC input sources feeding to the STS. If the preferred input source
power is not available, the STS will transfer to the alternate input source, avoiding interruption to the critical load.
The output power is conditioned and stepped down to distribution voltage via an isolation transformer, feeding
panelboards or main frame circuit beakers.
In the PMM2Ultra configuration, an isolation transformer feeds each STS input
source upstream of the STS. The
transformer secondary output of the PMM2-1
(left cabinet) supplies the Source-1 input and PMM2-2 (right cabinet)
supplies Source-2 input of the STS cabinet. If the preferred source input power is not available, the STS will transfer
to the alternate input source, avoiding interruption to the critical load. The output of the STS connects to the output
busbars of the PMM2-1 and PMM2-2 cabinets, feeding panelboards or main frame
Figure 1-2: PMM2 and PMM2Ultra Cabinets.
Epilson STSTM
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