F07900Fault · DriveUsually repairable
SINAMICS S210 F07900: Drive Motor Blocked/Speed Controller At Its Limit
What F07900 means
The motor stayed at its torque limit while barely turning, so the S210 decided it is blocked.
Symptoms
The axis doesn't move when commanded, then trips after a fraction of a second.
Is it repairable?
Yes: brake and encoder repairs on the motor are common causes.
Common causes
- Holding brake not releasing
- Mechanical jam
- Encoder fault or wrong commutation
- One motor phase missing
- Speed loop oscillating
Safe checks
- 1Listen for the brake releasing on enable
- 2With power off, check the axis turns freely
- 3Check the motor connector and OCC cable
Drives hold dangerous voltage after power-off. Checks should only be done by qualified personnel, with power isolated and the DC link discharged.
Reviewed by AutomIQ repair technicians. Code and name from the SINAMICS S210 servo drive system Operating Instructions (09/2019).
Related SINAMICS S210 faults
- F07011Motor overtemperature
- F07412Commutation angle incorrect (motor model)
- F07575Motor encoder not ready
- F07801Motor overcurrent
- F07930Brake control error
- F30001overcurrent