50
7.3 Trouble Shooting In Other Cases
Problem
Possible cause
Remedy
No indication, no
warning tone even
though system is
connected to mains
power supply
No input voltage
Check the building wiring and input
cable.
Check if the input breaker is
closed.
BYPASS LED light up
even though the power
supply is available
Inverter not
switched on
Press On-Switch “I” to turn on
UPS.
BATTERY LED lights
up, and audible alarm
sounding every 1 beep
in every 4 seconds
Input voltage and/or
frequency are out of
tolerance
Check input power source.
Check the building wiring and input
cable.
Check if the input breaker is
closed.
Emergency supply
period shorter than
nominal value
Batteries not fully
charged / batteries
defect
Charge the batteries for at least 12
hours and then check capacity.
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. LCD/LED display information, Buzzer alarm status
4. Utility power condition, load type and capacity, environment temperature,
ventilation condition
5. The information (battery capacity, quantity) of external battery pack if the
UPS is “S” model
6. Other information for complete description of the problem
www.upsdirect.com
