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TROUBLESHOOTING
EATON Powerware
®
9155 Parallel UPS (8–15 kVA) User’s Guide S 164201592 Rev C www.powerware.com
57
ActionPossible CauseAlarm or Condition
Check Parallel Board The UPS is not recognizing another
parallel unit.
From the UPS Status menu, select the Units on CAN
Bus option and verify that all UPSs appear in the
list.
If any UPS is missing, verify the Powerware Hot
Sync CAN Bridge Card connections and recheck
the status from the UPS front panel.
If all U PSs appear in the list, check the pull-chain
wiring (see page 26).
Set the system to internal Bypass mode (see
page 53).
If the condition persists, contact your service
representative.
Abnormal output voltage
at startup
The UPS breaker on the parallel tie
cabinet was not switched to the ON
position properly.
Shut down the UPS where the alarm is indicated.
Switch the UPS breaker on the parallel tie cabinet
to the ON position.
Start up the UPS.
Select the System On option through the front
panel of the UPS that was turned off.
Selective Trip The Powerware Hot Sync CAN Bridge
Card is not wired correctly.
Verify the CAN wiring (see page 26).
Verify the pull-chain wiring (see page 26).
If the condition persists, contact your service
representative.
Silencing the Alarm
Before silencing an alarm, check the alarm condition and perform the
applicable action to resolve the condition.
Press any button on the front panel display to silence the alarm. If the
alarm status changes, the alarm beeps again, overriding the previous
alarm silencing.