Overspeed

What does OS mean?

An Overspeed (OS) fault occurs when the motor speed feedback, typically from the PG, exceeds the configured overspeed detection level (F1-08) for a duration longer than the delay time (F1-09). This indicates the motor is running faster than its allowed maximum, potentially due to incorrect control parameters, regenerative load conditions, or an encoder issue. Unresolved overspeed can lead to mechanical damage to the motor or driven equipment, and create safety hazards.

Additional Steps

Steps 1–2 are listed in Priority Fix.

1. 3

   Adjust F1-08 (Overspeed detection level) and F1-09 (Overspeed detection delay time) if the current settings are overly sensitive or inappropriate for the application's normal operating dynamics.

2. 4

   Investigate the application for external factors that could cause motor overspeed, such as runaway loads or incorrect gearing.

3. 5

   Review F1-03 to ensure the desired stopping method (Ramp to stop, Coast to stop, Fast-Stop, Alarm Only) for OS faults is selected.