18
4.2
For UPS Module
Problem
Possible Cause
Remedy
No output.
AC input and output circuit
breakers are off.
Turn on input and output circuit
breakers.
No line power input.
Turn on AC input breaker.
Red LED is lit solid on front panel
indicating fault.
Read fault event under Event Log in LCD
display. Manually restart UPS. Contact
the factory if fault persists.
Output LED is off.
Line power or battery power is not
available.
Apply qualified input power and make
sure if battery breaker is closed.
UPS fault.
Return to repair center.
UPS does not transfer to
battery mode during a
power failure or backup
time is shorter than
expected.
Battery is not connected.
Connect batteries (48VDC nominal).
Battery circuit breaker is off.
Turn on battery breaker
Battery is not fully charged.
Recharge the battery and then test
discharge time.
Dead battery.
Replace with new batteries.
UPS fault.
Return to repair center.
Alarm LED is lit.
Abnormal conditions are detected.
Solve the problem according to alarm
information in Figure 21.
Batteries will NOT charge.
Battery circuit is open.
1.
Check if battery cable is connected
firmly and make sure battery
connection is correct. Any
connection error, lose or open
connection will cause circuit open.
2.
Check if proper battery voltage is
detected on battery connector of
UPS.
3.
Check if battery breaker is closed.
4.
If battery is bad, replace it.
Wrong or bad temperature probe
connected.
Only use factory-supplied temperature
probe reading approximately 15,000
OHMS @ 25°C (77°F)
LCD text is not readable.
UPS fault.
Return to repair center.
Password access is NOT
available.
Password is LOST or forgotten.
Contact repair center for resetting the
new password.
