Error 20 Device monitoring

Response: Output stage inhibit (standard)

System state: Fault acknowledgment with CPU reset

Cause

Measure

Internal electronics supply voltage or externally connected DC 24 V supply voltage not within permitted voltage range.

– Check the voltage level of the external DC 24 V supply voltage and check for correct connection.

– Acknowledge the fault.

– If the fault occurs repeatedly, contact SEW‑EURODRIVE Service.

24 V power supply unit overloaded.

Check the project planning for the power demand.

Response: Output stage inhibit (standard)

Cause

Measure

The current load on the current paths of the DC 24 V supply voltage inside the device is too high. The signal outputs of the device were therefore de-energized.

– Remove all external consumers:

– from the digital outputs of the basic device

– from any options that may be present

– from all encoder connections

– from other consumers at the DC 24 V output voltage terminals

– Acknowledge the fault.

– Reconnect the consumers with the device, one after the other, until the error message appears once again.

– Connect a consumer with a lower current consumption or eliminate the short circuit.

Response: Warning with self reset

Cause

Measure

Fan function impaired.

– Check fan for contamination.

– If the warning occurs repeatedly, contact SEW‑EURODRIVE Service.

Response: Output stage inhibit (standard)

Cause

Measure

Fan defective.

Contact SEW-EURODRIVE Service.

Response: Voltage oscillations

Cause

Measure

The oscillation of the DC link voltage is outside the permitted range.

Check DC link voltage for oscillations.