Powerware 5075 kVA - Manual (Page 75)

67 Powerware BPIII Harsh Environment UPS 50--75 kVA Installation and Operatio n
164201261 Rev. F 111503
To Start the UPS in Bypass Mode:
If the power processing unit (PPU) of the UPS is not available and you need to
energize your critical load right away, you can energize your critical load without
the benefit of backup. To turn the UPS on in Bypass mode:
1. Turn the MODE switch to BYPASS. (The remaining switches can be in any
position.)
2. Ensure the Emergency Power Off PUSH TO RESET pushbutton is pressed in.
3. Turn the START switch to the right momentarily.
Power to the critical load is supplied by the bypass source. No backup is
available.
To Transfer the Critical Load to Maintenance Bypass from UPS Bypass:
1. Confirm BIB circuit breaker is closed.
2. Turn MODE switch to BYPASS.
The UPS switches to Bypass mode. If the bypass source is not available, the
power processor remains on and an alarm sounds.
3. Close MBP circuit breaker.
Caution: Failure to close the MBP circuit breaker will result in loss of power to
the critical load.
4. Open MIS circuit breaker. The critical load is now on maintenance bypass.
5. Open the BIB circuit breaker to electrically isolate the UPS bypass.
6. When the transfer is complete, move the CB2 breaker switch to OFF. Then
move the CB1 breaker switch to OFF.
The maintenance bypass source supplies the critical load and the power
processor de-energizes.
To Transfer the Critical Load to UPS Bypass from Maintenance Bypass:
1. Confirm BIB circuit breaker is closed.
2. Turn the MODE switch to BYPASS.
The UPS switches to Bypass mode. If the bypass source is not available, the
power processor remains on and an alarm sounds.
3. Close MIS circuit breaker.
Caution: Failure to close the MIS circuit breaker will result in loss of power to
the critical load.
4. Open MBP circuit breaker. The critical load is now on UPS bypass.
5. To transfer the critical load to normal mode follow the procedure “To Place the
UPS in Normal Mode” at the beginning of this section.