System Major Components - MGE UPS Systems Epsilon STS 200A Installation And User Manual

1.5

System Major Components

Source #1 CB1
Source #2 CB2
Output CB3A
Output CB3B
Source #1 Bypass CB4
Source #2 Bypass CB5
Keyed Interlocks
SCR Static Switch Assy.
Control Electronics
Front Display Panel
Gate Drive & Acq. PCA
Backfeed Protection Assy
TVSS Assemblies
Triple-Redundant
Control Power Supplies
CB Control Assembly
Output Snubber Assembly
Communications Card Cage Relay card providing programmable contacts (6 outputs/2 inputs) and JBUS card for
Customer Terminal Block
Fans (400/600A Models only) Ventilation fans provide forced-air cooling in the 400/600A models. 200A models are
86-504004-00 B03
Input isolation molded case switch with magnetic trip for isolating SCR static switch
#1 and associated components from source S1.
Input isolation molded case switch with magnetic trip for isolating SCR static switch
#2 and associated components from source S2.
Output isolation molded case switch with magnetic trip for isolating both static switch
sections from the load.
Optional, redundant output isolation molded case switch with magnetic trip (paral-
leled with CB3A) for isolating both static switch sections from the load.
Maintenance bypass molded case switch with magnetic trip for bypassing the static
switch section and connecting the load directly to source S1.
Maintenance bypass molded case switch with magnetic trip for bypassing the static
switch section and connecting the load directly to source S2.
Provided on the two bypass switches to prevent closure of both at the same time.
An optional interlocking scheme is available for additional keyed interlocks on the
source isolation switches to ensure that, prior to bypassing to a particular source,
the STS transfers the load to that source if the load is not already being powered by
that source. On closure of a bypass switch, the control logic will also shunt trip
opposite bypass and input isolation switches if necessary to prevent cross-connec-
tion of the two sources.
Three heatsink assemblies containing six pairs of "hockey-puck" SCR's. Switch #1
and #2 (each having 3 pairs of SCR's) automatically switch the load to either source
S1 or S2.
The microprocessor-based core control uses FPGA's for input and output signal
processing and control sequencing to optimize sensing time.
The LCD screen, pushbuttons and LED mimic diagram make up the display.
Independent gate drive and acquisition circuits for each sources SCR switch.
A separate redundant circuit for each source provides backfeed protection to ensure
that there is no cross-connection between the two sources in the event of a shorted
SCR on the inactive source with the upstream circuit breaker open.
Optional Transient Voltage Surge Suppressor on each source input.
Three, independent DC control power supply assemblies (fed from each of the two
sources and the STS output) provide redundant DC control power.
A separate circuit supplies DC control power (fed directly from the output terminals)
for shunt-tripping the power switches CB1-5 and for supplying EPO power even in
maintenance bypass mode.
Provides preload under no-load conditions.
RS232 or RS485 connections. Two slots available for options.
Terminals for connection of remote Emergency Power Off (EPO) and Source Loss
Test switch.
convection cooled.
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