Different Types Of Galaxy Pw™ Systems; Isolation And Protection Devices - MGE UPS Systems Galaxy PW User Manual

different types of Galaxy
PW™ systems
single-UPS unit
A B
1
D
C
2
Fig. 2
parallel UPS system
See figure 3 showing two parallel-connect-
ed (redundant) UPS units.
1
S
2
2
Galaxy 1
1
2
Galaxy 2
Fig. 3
When increased power is required (two to
four parallel units), an external bypass
must be added (see figure 4).
1
2
2
Galaxy 1
1
2
Galaxy 2
1
2
Galaxy 3
1
2
Galaxy 4
Fig. 4
Introduction
isolation and protection
devices
(See figure 1 on previous page):
Q1 (Molded circuit breaker NA):
Q3BP
isolation of the rectifier/charger (A) from
the normal AC source (1);
rectifier/charger (A) start-up;
Q5N
QF1 (circuit breaker):
battery (D) protection and isolation;
Q5N (switch):
isolation of the UPS (B) from the load;
Q4S (switch):
isolation of the static bypass (C) from
the bypass AC source (2);
Q3BP (switch):
bypass switch for maintenance;
FUE (fuses):
protection of the rectifier/charger (A)
from the normal AC source;
FUS (fuses):
protection of the inverter (B) from the
Q3BP
load.
Note:
Q5N
switch Q3BP is lock on open position on
parallel UPS systems constituted to
increase available power.
external bypass for parallel
UPSs and the hot-swap
option
See figure 4.
Q5N: isolation of the inverters of all the
parallel UPS systems from the load;
Q3BP: bypass for maintenance.
User's Manual
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