Troubleshooting; Table 7 Troubleshooting-Problems, Causes And Solutions - Liebert PSI 750 User Manual

9.0 T
ROUBLESHOOTING
The information below indicates various symptoms a user may encounter in the event the Liebert PSI
experiences a problem. See Table 7 for suggested solutions.
1. An alarm sounds, alerting that the UPS requires attention. The alarm can be silenced except for
low battery, overload warning and fault.
2. One or more additional indicators will be illuminated to provide a diagnostic aid to the operator,
as described below:
If the UPS fails to operate properly, turn Off the unit and repeat the steps in 3.0 - Installation. If the
problem persists, refer to Table 7.
Table 7 Troubleshooting—problems, causes and solutions
Problem
UPS will not start
UPS starts on battery, but will not
switch to AC (dark start)
UPS shuts down
Battery weak LED (LED 3) flashing
Cause
Short circuit
Battery is disconnected or
completely discharged
UPS not plugged in
Circuit breaker tripped
AC overvoltage
Short circuit or UPS output is
abnormal; LED 10 and LED 11
illuminate and sound audible
alarm
Overload; LED 5 and LED 11
illuminate and sound audible
alarm
LED 3 and LED 11 illuminate
and sound audible alarm
Liebert MultiLink software
Batteries weak
Batteries need to be replaced
21

Troubleshooting

Solution
Check the circuit breaker on the rear of the
UPS.
If it is tripped, reset it and restart the UPS.
For help, contact your local dealer, local
Emerson representative or Channel
Support Applications.
Check for proper connection of battery or
batteries.
Plug in the power cord securely.
Reset the circuit breaker and restart the
UPS.
Wait until voltage drops to an appropriate
level or have the utility power checked by a
properly trained and qualified electrician.
Remove the load and turn on the UPS
again. For help, contact your local dealer,
local Emerson representative or Channel
Support Applications.
Check load level display and remove
nonessential loads. Recalculate the load
and reduce equipment connected to UPS -
the total wattage must not exceed the
capacity of the UPS.
Recharge the battery for 8 hours, then turn
ON the UPS.
Consult the Liebert MultiLink user manual
or contact your LAN administrator.
Recharge batteries.
Replace batteries.