A52901 fault in siemens sinamics V90 drive

A52901 alarm in siemens sinamics V90 drive indicates the Braking resistor reaches its alarm threshold. This means the dynamic braking resistor is absorbing significant energy and is approaching its maximum thermal capacity. 

Cause: The heat capacity reaches the threshold (p29005) of the braking resistor capacity.

Remedy:
  • Change the external braking resistor.
  • Increase deceleration time.

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