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TROUBLESHOOTING
The information below indicates various symptoms a user may encounter in
the event the Liebert GXT2U develops a problem. Use this information to
determine whether external factors caused the problem and how to remedy
the situation.
1. The Fault indicator will illuminate, indicating the UPS detected a problem.
2. An alarm will sound, alerting that the UPS requires attention.
3. One or more additional load/battery level LED indicators will be illumi-
nated to provide a diagnostic aid to the operator, as described below:
Under fault conditions, the Fault indicators will be illuminated indefinitely
while battery charger is operational, or for a maximum of 5 minutes while
battery charger is not operational.
If a problem persists, consult your local dealer, Liebert representative or
contact the Liebert Worldwide Support Group. Please have the UPS model
number and serial number available at the time of your inquiry.
LED
Status
Diagnosis/Audible alarm
All LEDs On bypass due to output overload; beep every half-second
A LED On bypass due to overtemperature condition; beep every 4 sec.
B LED On bypass due to DC bus overvoltage; beep every 4 sec.
C LED On bypass due to control power supply failure; beep every 4 sec.
D LED On bypass due to PFC failure; beep every 4 sec.
E LED On bypass due to inverter failure; beep every 4 sec.
A&C LEDs UPS failed battery test; long beep every minute
C&E LEDs UPS shutdown due to command from communication port (SNMP); no beep
Battery LED
Flashing
Internal Battery source not available (continuous horn). Check battery
connection, completely power down and reboot UPS.
AC LED
Flashing
Line-to-neutral reversal in the AC input power supply or a loss of proper
grounding; continuous horn and UPS will not start.
Bypass LED
Flashing
Utility power voltage or frequency is out of tolerance; bypass is unavailable.
This example shows the UPS
on bypass due to output overload.
Fault
E
D
C
B
A
ABCDEFault
AC INPUT BATTERY UPS ON BYPASS
BATTERY
UPS ON
BYPASS
AC
INPUT
LOAD/BATTERY
LEVEL INDICATORS