MGE UPS Systems Galaxy PW User Manual page 37

parallel UPS redundant and
for increased output
See figure 22.
isolate all UPSs
Proceed in the following order (see figure
23):
shut down the inverters (press the
"inverter OFF" buttons 8 for three sec-
onds),
close switch Q3BP and open switch
Q5N in the external bypass unit,
open switches Q1, QF1 and Q5N on the
UPS units.
start-up
Following servicing, proceed in the follow-
ing order (see figure 24):
close switches Q5N on the UPS units,
close switch in the external bypass unit,
open switch Q3BP in the parallel-con-
nection unit,
close switches Q1 and QF1 on the UPS
units,
start the inverters (press the "inverter
ON" buttons 7 ).
NOTE
We recommend that you
call on the after-sales
support department to
carry out these opera-
tions.
Note that for parallel
UPSs for increased out-
put, the entire installation
must be bypassed
because it is not possible
to isolate just one UPS
unit.
2
Fig. 22
Galaxy PW
1
Q1 Q4S
1
1 1
5
0 0
0
QF1
6
0 I
1
1
7 0
0
Fig. 23
Galaxy PW
1
Q1 Q4S
1
1 1
5
0 0
0
QF1
6
0 I
1
1
7
0
0
Fig. 24
Maintenance
Q1 Q5N
1
QF1
Q4S
2
Galaxy 1
1
2
Galaxy 2
1
2
Galaxy 3
1
2
Galaxy 4
2
external bypass
1
Q3BP
Q5N 0
1
1
0 Q5N
0
1
0
2
external bypass
1
Q3BP
Q5N 0
1
1
0 Q5N
0
1
0
User's Manual
Q3BP
Q5N
3 4 5
1 1
0 0
1 1
0 0
3 4 5
1 1
0 0
1 1
0 0
29