MGE UPS Systems Galaxy PW Manuale Utente
5
different types of Galaxy
PW™ systems
PW™ systems
single-UPS unit
Fig. 2
parallel UPS system
See figure 3 showing two parallel-connect-
ed (redundant) UPS units.
ed (redundant) UPS units.
Fig. 3
When increased power is required (two to
four parallel units), an external bypass
must be added (see figure 4).
four parallel units), an external bypass
must be added (see figure 4).
Fig. 4
isolation and protection
devices
devices
(See figure 1 on previous page):
■
Q1 (Molded circuit breaker NA):
❏
isolation of the rectifier/charger (A) from
the normal AC source (1);
❏
rectifier/charger (A) start-up;
■
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
load.
Note:
■
switch Q3BP is lock on open position on
parallel UPS systems constituted to
increase available power.
increase available power.
external bypass for parallel
UPSs and the hot-swap
option
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.
2
1
Q3BP
Galaxy 1
Galaxy 2
2
1
Galaxy 3
2
1
Galaxy 4
2
2
Q5N
1
2
1
Q3BP
S
Galaxy 1
Galaxy 2
2
2
Q5N
1
1
2
A
B
C
D
User’s Manual
Introduction