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6. Trouble Shooting
If the UPS system does not operate correctly, please attempt to solve the problem using the
table below.
Problem Possible cause Remedy
No indication, no warning tone even
though system is connected to
mains power supply
No input voltage Check building wiring socket outlet and input
cable.
LINE LED blinks Phase and neutral
conductor at input of UPS
system are reversed
Rotate mains power socket by 180° or connect
UPS system.
LINE-LED blinks and
BATTERY-LED lights up
Input power and/or
frequency are out of
tolerance
Check input power source and inform dealer if
necessary
LINE and BYPASS LED light up
even though the power supply is
available
Inverter not switched on Press On-Switch “I”
INVERTER LED lights up, and
audible alarm sounding every 1
beep in every 4 seconds
Mains power supply has
failed
Switching to battery mode automatically.
When audible alarm sounding every second,
battery is almost empty.
FAULT LED lights, warning tone
once a second
Overload Remove loads of UPS output.
FAULT-LED lights up, permanent
warning tone
UPS fault Notify dealer!!
Emergency supply period shorter
than nominal value
Batteries not fully charged
/ batteries defect
Charge the batteries for at least
1 - 2 hours and then check capacity. If the
problem still persists, consult your dealer.
FAULT LED lights, BATTERY-LED
blinks, warning tone once a second
Charger or Batteries
damaged
Notify dealer!!
Please have the following information at hand before calling the After-Sales Service
Department:
1. Model number, serial number
2. Date on which the problem occurred
3. Detailed description of the problem
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