Troubleshooting
29
7.0
T
ROUBLESHOOTING
If any technical problems should occur, check the following before contacting Liebert technical sup-
port:
1. Is the mains voltage present at the UPS input?
2. Has the input fuse blown or have the circuit breakers tripped?
3. Has the UPS startup procedure been followed correctly?
When contacting Liebert technical support, have the following information to hand:
• Device model number
• Serial number (from the nameplate)
• Exact description of the problem (what loads are being operated, does the problem occur regularly
or sporadically, etc.)
For descriptions of the indicators mentioned in the following table, see ‘Controls and Messages’.
Table 9
Troubleshooting - errors and corrective action
Problem
Possible cause
Solution
No display
No alarm
(UPS switched Off)
Mains switched Off
Switch On main breaker
No mains voltage present
Have mains inspected by a qualified technician
Input fuse blown or input
circuit breaker tripped
Replace with fuse of same type or switch On
circuit breaker. If the problem persists, contact
technical support.
UPS on
LED does not light up,
alarm beeps sound at intervals
No mains voltage present
UPS operation control panel
UPS on
LED does not
illuminate when mains voltage
present, audible alarm active at
intervals
Input fuse defective or input
circuit breaker tripped
Replace with fuse of same type or switch On
circuit breaker. If the problem persists, contact
technical support
FAULT
LED illuminates, alarm
sounding constantly
UPS error
Contact technical support
Overheating
Decrease ambient temperature
Autonomy less than specified
The fuse switch of the battery
extension(s) is
‘OPEN’
.
Contact technical support.
Batteries are not fully
charged
Charge batteries (see ‘Batteries’) and test
backup time. If the problem persists, contact
technical support.
Batteries are defective
Contact technical support
Charging device is defective
Contact technical support
‘OVERLOAD’ message
displayed
Overload at UPS output
Reduce load to the permissible value
No communication between
UPS and PC
Wrong serial connection
cable
Check whether the correct cable has been
used (standard modem/null modem cables are
not permissible)
Interface on the PC is being
used by another process or is
defective
Check whether other software/service is
accessing the interface on the PC; try selecting
a different serial interface
Interference on the data
cable
Lay cable differently/Reinstall cabling
