HP Tower Uninterruptible Power System - Manual (Page 57)

Troubleshooting 57
Overload condition
All the load LEDs are illuminated.
Action:
1. Power down the UPS (" Powering down the UPS " on page 42 ).
2. Remove one or more load devices to reduce the power requirements.
3. Wait at least 5 seconds and restart the UPS.
4. If the condition persists, verify that the load devices are not defective.
Checksum failure error
A Checksum failure error occurs when executing a bad load sequence, or having an incorrect EEPROM
map while loading software through the serial or USB port.
Action:
1. Rerun the firmware upgrade.
2. If the condition persists, contact an HP authorized service representative.
UPS does not start
Action:
1. Be sure that the power cord is plugged in to a utility power receptacle.
2. Check the power source at the utility power receptacle.
Low battery shutdowns
Ungraceful shutdown of attached servers occurs when the UPS is in a low battery condition.
Action:
1. Verify that the power management software is not delaying the shutdown of attached servers when
the UPS is in a low battery condition.
2. Allow the UPS batteries to charge for 24 hours.
3. If the Battery Fault LED is red, replace the batteries (" UPS battery replacement procedure " on page
46 ).
UPS does not provide the expected backup time
Action:
1. If the Overload LED (" UPS front panel controls " on page 8 ) is illuminated, remove one or more load
devices to reduce the power requirements.
2. Power down the UPS (" Powering down the UPS " on page 42 ).
3. Allow the UPS batteries to charge for 24 hours.
4. Initiate a self-test (" Initiating a self-test " on page 41 ).