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54 Installation Guide APC Silcon 480kW 400V UPS
990-4053
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6.2.4 Isolating One UPS for Service/Maintenance
In a redundant system, one UPS may be isolated for service/maintenance without affecting
other UPSs.
1. Check that remaining UPS(s) is capable of carrying the load in the event that one UPS is isolated
2. Switch off system to be isolated for maintenance purposes by pushing green “ON” and red
“OFF” buttons simultaneously
3. To disconnect battery, mains and output, open battery MCCB/fuse and set input switch (Q001)
and output switch (Q002) to position “0”
With Q002 in position “0”, UPS will be operational and may be tested as a single system
without affecting other parallel UPS(s).
The following can be carried out on any UPS
13. Press on the keyboard
14 Press or on the keyboard until
15. Press on the keyboard
16. Press on the keyboard
All the systems will transfer to normal operation.
Normal operation
load power xx%
Display shows
Bypass operation
:NO
Bypass operation
:YES
No lamps on the bypass
panel lights any longer