Overspeed

What does OS mean?

This fault is triggered when the motor's actual speed exceeds a pre-set overspeed detection level (F1-08) for a specified time (F1-09). This can occur due to an incorrectly set speed reference, loss of load, a faulty speed feedback device, or the motor being driven externally by the load. Sustained overspeed can cause mechanical damage to the motor and coupled equipment.

Additional Steps

Steps 1–2 are listed in Priority Fix.

1. 3

   Adjust parameters F1-08 (Overspeed Detection Level) and F1-09 (Overspeed Detection Time) if the current settings are too sensitive for the application.

2. 4

   Inspect the mechanical load for any conditions that might cause the motor to overspeed (e.g., runaway load).

3. 5

   Perform a functional test of the motor at various speeds to confirm expected behavior.