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4.3.3 UPS Isolation Parallel UPS With External Bypass Cabinet
Shutdown and isolation of one UPS:
Figure 4-4: Parallel UPS Configuration With External Bypass Cabinet
Shutdown and isolation of all the UPSs:
Figure 4-5: Shutdown and Isolation of all the UPSs
1 - On each UPS, press a button to exit sleep mode.
2 - Shutdown each UPS by pressing their OFF buttons (38)
for 3 seconds.
3 - Depress the “transfer initiate” switch on the SBC. Unlock
“KS” and remove key “A”.
4 - Insert key “A” into CB1. Unlock and close CB1.
5 - Open CB2 and lock open, and remove key “B”.
6 - Insert key “B” into key interlock “KS” and turn to lock.
7 - Open output isolation CB11-16, as applicable, and open all
Q5N (11) switches of each UPS.
8 - Open battery CB of each UPS.
9 - Open Q1 (8) and Q4S (9) switches of each UPS.
10 - Turn off all inputs to the UPSs.
11 - Wait until the control electronics of all UPS units have
fully shutdown.
The load is no longer protected by the UPSs, but
continues to be supplied with AC power.
UPS maintenance or servicing can now be carried out.
CB2
KS
KB
KA
CB11
CB12
CB13
CB14
CB15
CB16
CB1
1 - First check that the total capacity of the remaining UPSs
is sufficient to supply the connected load.
2 - Press a button to exit sleep mode.
3 - Shut down the UPS by pressing the OFF button (38) for
3 seconds.
4 - Set output switch Q5N (11) to OFF.
5 - Set the battery circuit breaker of the auxiliary cabinets
to OFF.
6 - Set the input switch Q1 (8) to OFF.
7 - Set the switch Q4S (9) to OFF.
8 - Wait until the display and LEDs go off.
MGE Galaxy 5000
Maintenance4 — 4 86-174010-00 B00