Code 7902 — Siemens Drive Fault

Ensure the motor is not physically obstructed and the brake (if any) is fully releasing. Verify Motor Nameplate Data: Re-enter motor data ( p0304p 0304 rated voltage, p0305p 0305 p0307p 0307 p0308p 0308 p0311p 0311 rated speed) precisely.

This report provides a comprehensive overview of the (F07902), often occurring in SINAMICS G120XA, G120, and S120 drives. 1. What is Fault F07902?

For more detailed steps, check the Official Siemens Support Portal . #Automation #Siemens #SINAMICS #Maintenance #Engineering

Does the fault happen at , or while the machine is running ? Is your motor using an encoder ? siemens drive fault code 7902

Access fault buffer: r0947 lists last 8 faults. r0949 gives additional info (e.g., temperature at time of trip). This helps separate actual overheat from sensor failure.

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If you see , your drive has been "orphaned." It thinks the controller (PLC) has abandoned it. 95% of the time, this is a broken cable, a loose connector, or the PLC being stopped. Ensure the motor is not physically obstructed and

: Redo the motor data identification (p1900=2) and static optimization.

is a protective response to either genuine motor overheating or a faulty temperature sensing circuit. By following a logical diagnostic path—checking actual motor temperature, inspecting wiring, verifying parameters, and analyzing historical data—most instances can be resolved in under 30 minutes.

Run the static/rotating motor data identification (set and start the drive). verify the encoder signal is accurate.

Troubleshooting Siemens Drive Fault Code 7902: Motor Stalled/Blocked

The load on the motor is significantly higher than its rated capacity, preventing it from reaching the set speed. Incorrect Motor Data:

If using encoder feedback, verify the encoder signal is accurate.