Powerware 9355 - Manual (Page 58)

PARALLEL BYPASS
EATON Powerware ® 9355 Parallel UPS (10/15 kVA) User’s Guide S 164201601 Rev A www.powerware.com 52
To return to Normal mode from maintenance bypass:
1. Verify that all UPS breakers on the parallel tie cabinet are in the OFF
position.
2. Switch on utility power where the UPSs are connected.
In a parallel capacity system (N+0 or N+1), apply utility to the
minimum number of UPSs required for capacity.
NOTE Use the same UPS that was used to set internal bypass to return the parallel system
to Normal mode.
3. Set the system to internal Bypass mode:
S Using the button on the front panel display, scroll to the Control
menu option and press the button.
S Press the button to select the Go to Bypass Mode option.
The and indicators illuminate, indicating the UPS system
is operating in Bypass mode.
4. Switch all UPS breakers on the parallel tie cabinet to the ON
position.
5. Switch the bypass breaker on the parallel tie cabinet to the OFF
position.
6. On the same UPS front panel, set the UPS to Normal mode:
S Press the button to select the Go to Normal Mode option.
S Each UPS should go to Normal mode.