HP Tower Uninterruptible Power System - Manual (Page 60)

Troubleshooting 60
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 47 ).
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 44 ).
3. Allow the UPS batteries to charge for 24 hours.
4. Initiate a self-test (" Initiating a self-test " on page 43 ).
5. During extended power outages, save your work, power down the load devices, and then power down
the UPS ("
Powering down the UPS " on page 44 ) to conserve battery power.
UPS frequently switches between utility and battery
power
Action:
1. Check the input voltage and reconfigure the UPS (" Configuring the UPS " on page 42 ).
2. Contact a qualified electrician to verify that the utility power is suitable for the UPS.