Overspeed
Yaskawa · V1000 AC Drive
What does oS mean?
This fault signals that the motor is operating at an excessively high speed, which can be caused by overshoot during acceleration/deceleration, incorrect PG (Pulse Generator) pulse settings in the drive, or an improperly configured overspeed detection level. Uncontrolled overspeed can lead to severe mechanical failure, component damage, and potential safety hazards for personnel and equipment.
Additional Steps
Steps 1–2 are listed in Priority Fix.
- 3
Verify and correct the number of PG pulses configured in the drive by setting H6-02 [Terminal RP Frequency Scaling] to the pulse train frequency corresponding to 100% maximum motor speed.
- 4
Fine-tune the overspeed detection settings by adjusting F1-08 [Overspeed Detection Level] and F1-09 [Overspeed Detection Delay Time] to accurately reflect the application's safe operating limits and avoid false trips.