F30005Fault · Power unit (Motor Module)
SINAMICS S120 F30005: Power Unit Overload I2t
What F30005 means
The power unit's thermal model calculated that it carried too much current for too long (I2t overload).
Symptoms
Trips during long, heavy duty cycles; clears after a rest and then comes back.
Is it repairable?
Often mechanical; repairable when the drive's current measurement is faulty.
Common causes
- Mechanical binding (worn ball screw, bearings, gibs or guides)
- Holding brake dragging
- Drive undersized for the duty cycle
- Oscillating or badly tuned control loop
- Motor fault drawing extra current
Safe checks
- 1Compare the actual current with the module rating
- 2With power off and the axis safely supported, feel for binding
- 3Confirm the brake releases fully
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 S120/S150 List Manual.
Related SINAMICS S120 faults
- F07011Motor overtemperature
- F07900Motor blocked/speed controller at its limit
- F30001Overcurrent
- F30002DC link voltage overvoltage
- F30003DC link voltage undervoltage
- F30004Overtemperature heat sink AC inverter