Siemens Drive Fault Code 7902 Jun 2026

Remember: Never ignore 7902. While sensor faults are easy fixes, ignoring genuine overtemperature will lead to premature motor insulation failure, costly rewinds, or even a stalled production line.

Detected at very low speeds/standstill when the speed controller is at its limit. Motor Overspeed

Once physical maintenance is complete, reset the internal counter to clear the 7902 code and start a new cycle:

In technical terms, the drive’s internal motor model compares the expected motor speed (based on the setpoint) against the actual speed feedback (or an estimated value). If the deviation between what should be happening and what is happening exceeds a predefined threshold for a set amount of time, the drive shuts down and raises the F7902 fault to prevent damage to the mechanics, the motor, or the drive itself. siemens drive fault code 7902

Run the motor identification routine (p1900 or p1910) to allow the drive to measure the motor resistance and inductance. Step 3: Adjust Acceleration and Torque Limits

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) so the drive could catch the motor if it was already spinning. Remember: Never ignore 7902

Configure pre-alarm thresholds in the Siemens drive (such as configuring an output relay or PLC alarm bit for "Current Limit Reached") to warn operators of an impending overload condition before the stall timer reaches zero.

Are you using or is it in sensorless (V/f) control? sinamics drive motor fault 7902 - SiePortal - Siemens

Faulty speed feedback from an encoder or incorrectly connected motor cables (e.g., swapping U and W phases) can cause the drive to "think" the motor is stalling. Brake Malfunction: Motor Overspeed Once physical maintenance is complete, reset

Ensure motor enclosures and feedback encoders are shielded from excessive vibration, dust, and ambient moisture.

For detailed parameter lists and specific drive models, you can refer to the Siemens SiePortal Support F7902 Technical FAQ specific parameter numbers for a particular Siemens drive series, such as the SINAMICS G120

Set parameter p96 = 1 (Standard commissioning) to apply robust default settings. Conclusion