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5
different types of Galaxy
PW™ systems
single-UPS unit
Fig. 2
parallel UPS system
See figure 3 showing two parallel-connect-
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).
Fig. 4
isolation and protection
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.
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.
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
AB
C
D
User’s Manual
Introduction