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Problem
UPS no reaction while AC
is connected
UPS no reaction while AC
is connected, yet DC starts
after pushing power on/off
switch
UPS goes into DC mode
connected to AC
UPS still in bypass mode
after de-green mode
function
Keys on front panel don't
work
Press FUNCTION key in
AC mode, but the UPS goes
back to AC mode within
less than 10 seconds
Fault LED lit
Battery cannot provide
normal back up power
when there is no AC input
Causes
No AC input
UPS fault
Battery damaged
Input / output sensor fault
No AC input
UPS fault
AC voltage or frequency
abnormal
UPS AC detecting circuit
fails
UPS still in POWER OFF
status
UPS is proceeding
controlling process
Key damaged
Internal battery
deteriorated
UPS abnormal
Output load abnormal or
short circuited
Internal battery
deteriorated
Batteries not fully charged
Battery charger damaged
Solutions
Check AC power
Call for service
Call service to replace batteries
Call for service
Check AC power
Call for service
Check AC power
Call for service
Press power on/off key,
Buzzer sound once and the UPS
Become normal
Wait for a while to operate the UPS
Call for service
Call service to replace batteries
Call for service
Check load
Call service to replace batteries
Charge the battery
Replace charger and charge the
battery if necessary
１３
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