Maximum system speed exceeded

¿Qué significa NMAX ?

The maximum system speed, set by C0596, has been exceeded. This can be caused by an active load that is too high, the drive not being speed-controlled, or an excessively limited torque, leading to overspeed conditions.

• Incorrectly set maximum speed limit (C0596) that is lower than the actual required or commanded speed.
• Uncontrolled acceleration due to insufficient braking torque, especially with regenerative loads (e.g., lowering a heavy hoist).
• Drive operating in torque control mode without a speed governor, allowing the motor to overspeed with a light load.
• Mechanical decoupling of the load from the motor, causing the motor to spin freely at high speeds.
• Faulty speed feedback (encoder/resolver) providing incorrect, low speed values, leading the controller to command excessive output frequency.

Haga clic en los pasos para seguir su progreso.

1. 1

   Review and adjust parameter C0596 (Maximum system speed) to a value appropriate for the application and motor's maximum safe speed.

2. 2

   Verify the braking resistor connection and value (P1-52, P1-53) and braking chopper functionality for applications with regenerative loads.

3. 3

   Confirm the drive operating mode (e.g., C0015 = 1 for speed control) to ensure it is actively regulating motor speed.

4. 4

   Physically inspect the coupling between the motor and the load for any damage or disengagement.

5. 5

   Verify the speed feedback sensor (encoder/resolver) signal integrity using an oscilloscope while the motor is running.

6. 6

   Check acceleration/deceleration ramps (P1-00, P1-01) to ensure they are not set too short, which can lead to overshooting speed limits.