Siemens Drive Fault Code 7902 May 2026

Understanding and Resolving Siemens Drive Fault Code 7902 The Siemens Drive Fault Code 7902 (often displayed as F07902) is a critical error indicating a "Motor Stalled" condition. This fault occurs when the drive’s control logic determines that the motor is not rotating as expected despite receiving power, or when the deviation between the calculated motor speed and the actual measured speed exceeds defined limits.

Adjust Fault Tolerance: If the motor isn't genuinely stalling but the drive thinks it is, you can adjust parameters to be less sensitive: Increase delay time: p2178p 2178 (Stall delay). Increase fault tolerance: p1745p 1745 . Specific Fix for G120XA siemens drive fault code 7902

"It’s a 7902," Marcus said, reading the 7-segment display on the BOP (Basic Operator Panel). "Just '7902'. I tried resetting it, but it just clicks and throws the same code again." Understanding and Resolving Siemens Drive Fault Code 7902

Which specific drive model (e.g., G120X, S120) are you using? Verify PLC status: 3

Verify PLC status:

3. Possible causes

Incorrect motor data entered in parameters (p0300–p0311)
Speed controller not optimized (p1470, p1472)
Drive train breakage or load suddenly dropping
Encoder feedback failure (noisy, loose, or wrong encoder type set)
Acceleration ramp too aggressive for load (p1120 too short)
Overspeed threshold (p2162) set too low
During ramp-down: regenerative energy causes overvoltage → speed overshoot

Contact Siemens Support: If the issue persists, it may be necessary to contact Siemens technical support or a qualified service technician. They can provide guidance specific to your situation and perform repairs if needed.

Upgrade motor size: If load is unavoidable, move to next frame size.