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Troubleshooting 44
Troubleshooting
Alarm troubleshooting
This UPS is designed for durable, automatic operation and also to alert you whenever potential operating
problems might occur. Usually the alarms shown on the control panel do not mean that the output power is
affected. Instead, they are preventive alarms intended to alert you of a possible condition.
The following table describes typical alarms and conditions. If an alarm appears with a service code, contact
HP technical support ("Support and other resources" on page 58, "HP contact information" on page 58).
To check the Event Log for a list of active alarms:
1. Press the ESC button on the front panel display to activate the menu options.
2. Press the down arrow button until the Event Log menu appears.
3. Press the Enter button to display the list of alarms and conditions.
Alarm number Alarm name Alarm description Alarm type
1
Inverter AC Under Voltage The UPS has detected abnormally low output voltage
levels.
Alarm
6
Input AC Over Voltage The utility RMS voltage is greater than the maximum
valid utility threshold.
Alarm
7
Input AC Under Voltage The utility RMS voltage is less than the minimum valid
utility threshold.
Notice
8
Input Under/Over
Frequency
The utility frequency is out of usable frequency range. Notice
12
Remote Emergency Power
Off
The external contacts in the rear of the UPS are
configured for REPO operation and they have been
activated.
Alarm
25
Output Overload Load levels are at, or have exceeded, the
configurable threshold limit for a Level 1 Overload
condition.
Notice
26
Rectifier Input Over Current
The UPS has detected that rectifier input current limits
have been exceeded.
Alarm
27
Inverter Output Over Current The UPS has detected that inverter output current limits
have been exceeded.
Alarm
28
DC Link Over Voltage Indicates the link or rail voltage UPS has exceeded its
upper threshold limit.
Alarm
31
Inverter Fault The UPS has detected a fault in the inverter circuit
while attempting recovery from bypass or Fault
modes.
Alarm
55
Shutdown Imminent Indicates that the UPS entered a state where it might
stop operating abruptly without notice. An alarm is
issued when the BTR reaches 0 at the end of a battery
discharge cycle after all connected devices should
have shutdown gracefully already.
Alarm
56
Low Battery Warning Warning alarm indicating battery remain or battery
time remaining is lower than the battery low warning
level defined for the UPS.
Alarm