OPERATION
Restarting the Parallel SystemTo restart the parallel system:
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.
3.Wait for the front panel LCD to illuminate. The 
indicator flashes on each UPS.
4.Switch all battery circuit breakers to the ON position. The 
indicator stops flashing on each UPS.
5.Switch the UPS breakers on the parallel tie cabinet to the ON position.
6.Verify that no alarms appear on the UPS front panel display.
If the 
indicator is flashing, do not proceed until all alarms are clear. Check the UPS status from the front panel to view the active alarms. Correct the alarms and restart if necessary.
7.Press the ESC button once and then press the 
button to select the TURN UPS ON/OFF menu.
8.Press the 
button to select the System On option; press the
button.
9.Confirm the selection. Press and hold the 
button for three seconds, until the UPS stops beeping.
The UPS goes to Bypass mode for five seconds, and then the 
indicator illuminates. Each UPS should be in Normal mode.
10.Press the ESC button until the Eaton Powerware logo appears.
52 | EATON Powerware® 9155 Parallel UPS |