LEGRAND KEOR HP Série Manuel De L'utilisateur page 47

Alarm A21
Description The thermal image protection has been activated after an extended
inverter overload. The inverter is shut down for 30 minutes and then
restarted.
 Output overload.
Possible
causes
 Measuring circuit failure.
Solutions 1. Check the loads connected to the UPS output.
2. Should you need to restore the inverter supply immediately, reset
3. If the alarm persists, contact our Technical Support Service.
Alarm A22
Description The "Normal/Bypass" selector has been operated.
 Maintenance operation.
Possible
causes
Solutions 1. Check the selector position.
2. If the alarm persists, contact our Technical Support Service.
Alarm A23
Description The system is blocked due to the activation of the emergency power off
button.
 Activation of the (local or remote) emergency power off button.
Possible
causes
Solutions 1. Release the emergency power off button and reset the alarm.
2. If the alarm persists, contact our Technical Support Service.
Alarm A24
Description High temperature of the heat sink on the inverter bridge or tripping of
the DC fuses which protect the inverter bridge.
 Fault of the heat sink cooling fans.
Possible
causes
 The room temperature or cooling air temperature is too high.
 Tripping of the DC protection fuses.
Solutions 1. Check the fans operation.
2. Clean the ventilation grids and the air filters, if any.
3. Check the air conditioning system (if present).
4. Check the status of the DC fuses on the inverter bridge input.
5. If the alarm persists, contact our Technical Support Service.
Manuel de l'utilisateur de l'UPS
THERMAL IMAGE
the system.
BYPASS SWITCH
EPO PRESSED
HITMP INV/DC FUS
UPS user manual
Utilizzo dell'UPS
OMD10074 REV. C 47