R90 ONLINE USER’S MANUAL UNINTERRUPTIBLE POWER SUPPLY (UPS)
Xtreme Power Conversion Corporation (Rev 3/7/14) Page 57
Troubleshooting
1
Utility connected but the UPS
cannot power ON
Input power supply is not
connected.
voltage / frequency are
within the required range per
specification.
Check if all modules input
switches are turned on.
The input switch of the
module is not switched on
2
Utility normal but Utility LED does
not light, and the UPS operates at
battery mode
modules are not switched
on; input cables are not
properly connected
Switch on the input breaker.
Make sure the input cable is
properly connected.
3
The UPS does not indicate any
failure, but the output does not
have voltage
Output cable is not properly
connected
Make sure the output cable is
properly connected
4
Battery LED is flashing but no
charge voltage and current
Battery breaker does not
switch on, or batteries are
damaged, or battery is
reverse connected.
breaker. If batteries are
damaged, replace the entire
set of batteries. Connect the
battery cables correctly.
Battery number and
capacity are not set
correctly
Go to the LCD display setting
of the battery number and
capacity, and set with correct
data.
5
Audible beep every 0.5 seconds
and LCD displays “Output
Overload” code 39
Overload Remove some of the load
6 The UPS only works on bypass
The UPS is set to ECO Mode
or the transfer times to
Bypass Mode are limited
Set the UPS working mode to
Single Module type (non-
parallel) or to reset the times
of transfer to bypass or re-
start the UPS
7 Cannot Cold Start
properly closed or battery
capacity is low
Chose the battery breaker;
Recharge the batteries
15
Buzzer sounds continuously, Fault
LED is illuminated and the related
code of “Rectifier / Inverter Out of
Order” or “Output Out of Order”
shows in the LCD display
UPS has failed
Contact dealer or distributor
for service and repair
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