Troubleshooting
Linear Plus Series UPS User Instruction Manual
29
Troubleshooting
If, in spite of the high reliability of this UPS, problems should occur, please check the following points
before contacting Technical Support:
• Is the mains voltage present at the UPS input?
• Is the input fuse blown or have circuit breakers tripped?
When contacting Technical Support, please have the following information ready:
• UPS information = model #, system #, serial # as per nameplate
• An exact description of the problem (what loads are being operated, does the problem occur
regularly or sporadically etc.) including any fault message description(s)
• For description of the indicators mentioned below see section titled “Control Panel”
Table 13. Troubleshooting Table
Problem
Possible cause
Corrective Actions
No indication
No alarm
(UPS switched off)
Mains switched off.
Switch on main switch.
No mains voltage present.
Have mains inspected by qualified
electrician.
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.
“ON” LED does not illuminate, acoustic
alarm active at intervals
No mains voltage present.
UPS operation. see “Control Panel Menus
and Displayed Text/Options” on page 20
“ON” LED does not illuminate when mains
voltage present, acoustic 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 indicator illuminates, acoustic
alarm active continuously
UPS error.
Contact technical support.
Overheating
Decrease ambient temperature.
Battery run time less than specified
The fuse switch of the battery extension(s)
is blown.
Check for open fuses.
Batteries are not fully charged.
Charge batteries (see “Batteries” on page 4)
and test backup time, see “Battery Test” on
page 25. 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.
