Siemens Drive Fault Code 7902 Extra Quality

The Siemens drive fault code F7902 (or 7902) Motor Stalled (or "Motor out of step"). This fault occurs when the drive detects that the motor is not rotating despite a torque or current being applied, or it has lost synchronism with the drive's output frequency. Common Causes Mechanical Overload:

) so the drive could catch the motor if it was already spinning. siemens drive fault code 7902

2. Motor Winding Faults

• An open winding inside the motor (one phase is internally disconnected).
• High-resistance connection in a motor terminal (inside the motor junction box).
• Inter-turn short that leads to asymmetrical current draw.

This fault indicates that the drive has stopped receiving valid cyclic process data telegrams from the higher-level controller (PLC) within the configured monitoring time. The Siemens drive fault code F7902 (or 7902)

Step 3: Inspect Wiring

• Disconnect drive from power. Open terminal compartment.
• Locate thermistor leads (often white/white or blue/red).
• Measure resistance with multimeter:

  Advanced: Changing Fault Response for 7902

  In some applications, immediate trip on overtemperature is too aggressive. You can modify the response: An open winding inside the motor (one phase