LEGRAND BSK93, Operating Manual

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UPS user manual
Manuel de l’utilisateur de l’ASI
Utilizzo dell’UPS
OMP06263 REV. B 55
Alarm A21 THERMAL IMAGE
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

Output overload.

Measuring circuit failure.
Solutions 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.
Alarm A22 BYPASS SWITCH
Description The “Normal/Bypass” selector has been operated.
Possible
causes

Maintenance operation.
Solutions 1. Check the selector position.
2. If the alarm persists, contact our Technical Support Service.
Alarm A23 EPO PRESSED
Description The system is blocked due to the activation of the emergency power off
button.
Possible
causes

Activation of the (local or remote) emergency power off button.
Solutions 1. Release the emergency power off button and reset the alarm.
2. If the alarm persists, contact our Technical Support Service.
Alarm A24 HIGH TEMPERATURE
Description High temperature of the heat sink on the inverter bridge or tripping of
the DC fuses which protect the inverter bridge.
Possible
causes

Fault of the heat sink cooling fans.

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.