Overspeed

What does SOF mean?

The motor speed has exceeded its commanded or permissible limit, often due to an unstable control loop, an excessive regenerative load, or a mechanical runaway condition. This fault is critical as it can lead to mechanical damage to the driven equipment, create safety hazards, and result in a complete loss of control over the motor.

Complete Troubleshooting Guide

1. 1

   Check the motor's mechanical system for any free-running conditions or loss of load.

2. 2

   Review the drive's gain and stability parameters to ensure the control loop is stable and appropriately tuned for the application.

3. 3

   Add a braking resistor (and braking unit) if the application involves high inertial loads or frequent rapid decelerations that cause regenerative energy feedback.

4. 4

   Verify that the motor and drive are correctly sized for the application's torque and speed requirements.