33
TROUBLESHOOTING
Irregular UPS operation is most likely not an indication of a fault but due to simple problems or distraction.
It is therefore advisable to consult the table below carefully as it summarises information which is useful for solving the
most common problems.
PROBLEM
POSSIBLE CAUSE
SOLUTION
THE DISPLAY DOES NOT
LIGHT UP
INPUT SWITCH OPEN
Close the input switch located on the back of the UPS..
MAIN CONNECTION CABLE
MISSING
Check that the power cable is connected correctly.
NO MAINS VOLTAGE
(BLACKOUT)
Check that the power reaches the socket where the UPS
is connected (try it with a table lamp, for example).
UPSTREAM THERMAL
PROTECTION TRIP
Reset the thermal protection.
CAUTION: Check that there is no output overload to the
UPS.
THE DISPLAY IS ON BUT
THE LOAD IS NOT
POWERED
THE UPS IS IN STAND-BY
MODE
Press the “ON” button on the front panel to power the
loads.
THE STAND-BY OFF MODE
IS SELECTED
It is necessary to change mode.
The STAND-BY OFF (emergency power supply) mode,
in fact, only powers the loads in the event of a blackout.
NO CONNECTION TO THE
LOAD
Check the connection to the load.
THE UPS IS OPERATING
FROM THE BATTERY
DESPITE THE PRESENCE
OF MAINS VOLTAGE
THE INPUT VOLTAGE IS
OUTSIDE THE PERMITTED
TOLERANCE RANGE FOR
MAINS OPERATION
Problem with the mains. Wait until the input mains
voltage returns within the tolerance range. The UPS will
automatically return to mains operation.
UPSTREAM THERMAL
PROTECTION TRIP
Reset the thermal protection.
CAUTION: Check that there is no output overload to the
UPS.
THE DISPLAY SHOWS
THE FOLLOW CODE F
10
INPUT FUSE FAULTY
Switch off and disconnect the UPS from the power
supply and contact the support centre.
Call Critical Power Supplies on 0800 978 8988 for the latest information