Siemens Drive Fault Code 7902 Link -

Trying to accelerate a high-inertia load too quickly. 3. Electrical Issues

A disconnected or loose motor phase cable means the motor operates on only two phases, significantly dropping its torque output. Step-by-Step Troubleshooting Guide

Verify and adjust the following parameters within your Siemens TIA Portal or Starter software: siemens drive fault code 7902

Is this a or a fault that suddenly appeared on an existing machine? Share public link

: Ensure the input voltage is stable, as a significant voltage drop can reduce the motor's available torque. Trying to accelerate a high-inertia load too quickly

The root causes generally fall into four primary categories:

Troubleshooting Siemens Drive Fault Code F07902: Causes and Solutions If the brake doesn't receive voltage to release,

Verify the braking relay control voltage. If the brake doesn't receive voltage to release, the motor will stall. 4. Relevant Parameters Motor excitation time (increase if too low) p1745: Fault tolerance p2178: Motor blocked monitoring time p1610: Static torque setpoint p1200: Flying restart 5. Summary Table Suggested Action Fault at startup Perform static/rotating motor ID (p1900=2/3). Fault under load Increase p1610 (torque) or check mechanical load. Fault after power failure Enable flying restart (p1200=1). Motor brake locked Check brake relay and release voltage. To get a more specific solution, tell me:

Fault 7902 ("Motor Stalled") means that the speed controller has reached its maximum capability, yet the actual speed of the motor does not match the setpoint. Essentially, the drive thinks the motor is "stalled" or blocked.

This recalibrates the drive's internal mathematical model of the motor. Prevention and Best Practices