Motor Over Speed

What does Over speed mean?

This fault occurs when the motor's actual speed exceeds its programmed maximum or a safe operating limit. This can be caused by encoder feedback issues, a runaway load (e.g., overhauling), or incorrect speed control parameters. Operating above rated speed can lead to mechanical stress, vibration, and potential damage to the motor, driven equipment, and the VSD's control stability. It's a critical safety concern in many applications.

Additional Steps

Steps 1–2 are listed in Priority Fix.

1. 3

   Review and adjust the maximum speed settings and speed controller tuning parameters in the VSD to match application requirements.

2. 4

   Ensure the mechanical load is not overhauling the motor (driving it faster than commanded), especially in vertical or inclined applications.