LEGRAND KEOR HPE Manuel De Fonctionnement page 218

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.
Possible
causes
Solutions
Alarm A22
Description The "Normal/Bypass" selector has been operated.
Possible
causes
Solutions
Alarm A23
Description The system is blocked due to the activation of the emergency power off
button.
Possible
causes
Solutions
Alarm A24
Description High temperature of the heat sink on the inverter bridge or tripping of the
DC fuses which protect the inverter bridge.
Possible
causes
Solutions
52 OMG38225 REV. F
UPS user manual
Manuel de l'utilisateur de l'ASI
Utilizzo dell'UPS
THERMAL IMAGE
 Output overload.
 Measuring circuit failure.
1. Check the loads connected to the UPS output.
2. Should you need to restore the inverter supply immediately, reset the
system.
3. If the alarm persists, contact our Technical Support Service.
BYPASS SWITCH
 Maintenance operation.
1. Check the selector position.
2. If the alarm persists, contact our Technical Support Service.
EPO PRESSED
 Activation of the (local or remote) emergency power off button.
1. Release the emergency power off button and reset the alarm.
2. If the alarm persists, contact our Technical Support Service.
HIGH TEMPERATURE
 Fault of the heat sink cooling fans.
 The room temperature or cooling air temperature is too high.
 Tripping of the DC protection fuses.
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.