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6.2 Fault Diagnosis / Fault Rectification
The PROTECT C. generates detailed error messages.
Support personal can localise and interpret faults quickly and
precisely.
6.2.1 Error Messages
Problem Cause Solution
UPS does not start.
No indication, no audible
signal even though system
is connected to mains
power supply.
Mains and battery voltage
not in the tolerance range,
possible battery deep
discharge.
Check building wiring
socket outlet and input
cable.
LED “Line” flashes and
audible signal sounding
every 3 minutes.
Phase and neutral
conductor at input of UPS
system are reversed.
Rotate mains power
socket by 180° or
connect UPS system.
LED “Line” flashes and
LED “Battery” lights up.
Input power and/or
frequency are out of
tolerance.
Check input power
source (Voltage,
frequency) and inform
house electrician if
necessary.
LED “Line” and LED
“Bypass” light up even
though the power supply
is available. No supply of
connected loads.
Inverter not switched on.
Press On-Switch “ON”
for about 2 seconds.
LED “Inverter” and LED
“Battery” lights up, and
audible signal sounding
every 4 seconds.
Mains power supply has
failed. Automatic switch
to battery mode.
Try to replace mains
supply (possibly
triggered fuse in sub
distribution). When
audible alarm sounding
every second, battery
is almost unloaded. At
this point it is time to
proceed with an system
shutdown of all you IT
equipment.
LED “fault” lights, audible
signal once a second.
Overload of the UPS
system.
Reduce utilizations of
UPS by removing loads
of UPS output.