APC 20 - 200 KVA Manuale Utente
E-51028230XT/BG
- 7
Different types of
MGE™ Galaxy™ PW
systems
MGE™ Galaxy™ PW
systems
Frequency converter
without battery backup
power
without battery backup
power
Parallel UPS system
Fig. 2
Single-UPS unit
Fig. 3
Frequency converter with
battery backup power
battery backup power
Fig. 4
See figure 5 showing two parallel-
connected (redundant) UPS units.
A static bypass (C) does not exist in
parallel-connected frequency-converter
connected (redundant) UPS units.
A static bypass (C) does not exist in
parallel-connected frequency-converter
configurations.
When increased power is required (two
to four parallel units), an external
bypass must be added (see figure 6).
When increased power is required (two
to four parallel units), an external
bypass must be added (see figure 6).
Isolation and protection
devices
devices
(See figure 1 on previous page):
◗
Q1 (switch):
◗◗
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 does not exist on
parallel UPS systems constituted to
increase available power;
increase available power;
◗
the "Q3BP" and "Q4S" switches do
not exist on frequency converters;
◗
circuit breaker QF1 does not exist on
installations without batteries.
External bypass for parallel
UPSs and the hot-swap
option
UPSs and the hot-swap
option
See figure 6.
◗
Q5N (switch): isolation of the
inverters of all the parallel UPS
systems from the load;
systems from the load;
◗
Q4S (switch): isolation of the static
bypasses (C) on each parallel unit
from the bypass AC source (2);
from the bypass AC source (2);
◗
Q3BP (switch): bypass switch for
maintenance.
1
2
A
B
C
D
1
A
B
D
1
A
B
Fig. 6
2
1
Q3BP
Q4S
Galaxy 1
Galaxy 2
2
1
Galaxy 3
2
1
Galaxy 4
2
2
Q5N
1
Fig. 5
1
D
2
B
A
1
D
2
B
A
C
C
Introduction (cont.)