MGE UPS Systems EPS 7000 - Manual (Page 13)

Introduction page 1 — 3
Users Manual
1.4 Specifications, Circuit Breakers and Powerflow Diagrams
1.4.1 Circuit Breakers
EPS 7000 circuit breakers and switches (except the battery disconnect circuit breaker QF1) are located behind the
doors of the UPS cabinet, or through the door in the optional MBC. Following is a brief description of the available
circuit breakers, contactors and switches, and their function. The single-line diagram in Figure 1-4 shows the location
of each circuit breaker, contact and switch within the electrical path, and Figures 1-2 and 1-3 show the location of each
switch, contact and circuit breaker within the enclosures. Following is a brief description of the available circuit
breakers and contacts, and their function.
Upstream of the SSC:
Q4S Customer-supplied upstream circuit breaker, used to isolate the SSC from the bypass
AC input (mains 2) source and provide back-feed protection.
In the UPS modules:
Q1 Input isolation circuit breaker, used to isolate the UPS module from the main AC input
(mains 1) source and provide input current protection.
Q5N UPS isolation circuit breaker, used to isolate the UPS module from he attached load.
In the circuit of the battery of each UPS module:
QF1 Battery disconnect circuit breaker, used to disconnect the battery from the UPS. QF1
provides isolation and protection between the UPS module and its battery system.
Figure 1-2: Component Locations on the EPS 7000.
BLOWERS (4X)
BLOWERS (4X)
BLOWERS (3X)
RAUZ2 PCA (OPT)
RAUZ PCA
IBEZ PCA
OBEZ PCA
BAIZ1 PCA
TREZ PCA
ALBEZ PCA
EPOZ PCA
INVERTERS (6X)
DC CAPS
APOZ PCA
ACPZ PCA
ARUZ PCA
OUTPUT XFMR
(BEHIND PANEL)
ALEZ PCA
AROZ-US PCA
CROZ-US PCA
CRIZ-US PCA
SRIZ PCA
GTCZ-7000 PCA
GT2Z-7000 PCA (OPT.)
INPUT FILTER (3X)
OUTPUT FILTER (4X)
FAN XFMRS
OUTPUT FUSES
GUI POWER SUPPLY
INPUT FILTER FUSES
INPUT
FUSES
Q5N
OUTPUT CB/SW
Q1
INPUT CB/SW
CONTROL
FUSES
SERIES
FILTER
CHOKES
OUTPUT
STATIC
SWITCH
RECTIFIER
MODEM AND PWR
SUPPLY (OPTION)
MULTI SLOT
(OPTION)
CARD CAGE