Powerware 9330 - Manual (Page 121)

9--7 Powerware 9330 (10 kVA--40 kVA) Installation and Operation
164201300 REV. G 061502
9.10 Transfer from Normal to Bypass Mode with UPS
Shutdown
1. Transfer critical load to bypass by performing procedure in paragraph 9.6.
2. Press the System Control pushbutton. The System Control screen appears.
3. Toggle PPU OFF from the System Control menu.
The PPU status indicates SHUTDOWN. The input, output, and battery contactors
open and the PPU is turned off. The bypass source supplies the critical load.
WARNING:
Power is present inside the UPS and Options cabinets .
9.11 UPS and Critical Load Shutdown
To perform maintenance or service on the critical load, shut down power to the
load by performing the following procedure:
1. Turn off all equipment that is being powered by the UPS.
2. Perform LOAD OFF procedure contained in paragraph 9.15.1
The input, output, battery and bypass backfeed contactors open and the PPU is
turned off.
3. On the UPS, open Input circuit breaker CB1.
4. On the UPS, open Battery circuit breaker CB2.
5. If installed, open the Battery breakers on Battery cabinets.
6. If Options cabinet is installed, open Options cabinet Input, Bypass, and Output
circuit breakers.
WARNING:
Power is present inside the Options cabinet, until the upstream input feeder
circuit breaker is opened. Power is present inside the UPS cabinet due
to internal batteries.
7. Open the UPS input and bypass (if dual feed) feeder circuit breakers.
9.12 UPS Maintenance Bypass Transfer
To transfer the critical load to Maintenance Bypass, perform the following
procedure:
1. Transfer critical load to bypass by performing procedure in paragraph 9.6.
2. Manually set the UPS Maintenance Bypass Switch to BYPASS, by turning
slowly through the TEST position to BYPASS.
The input, output, battery and bypass backfeed contactors open and the PPU is
turned off. The maintenance bypass source supplies the critical load.
WARNING:
Power is present inside the UPS and Options cabinets .