Torque limit exceeded

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The motor or generator torque has exceeded the configured limit defined in parameter 4-16 Torque Limit Motor Mode or parameter 4-17 Torque Limit Generator Mode. Parameter 14-25 Trip Delay at Torque Limit can elevate this condition from a warning to an alarm after a set delay.

• Sudden increase in load or mechanical obstruction causing the motor to demand torque beyond configured limits (e.g., P4-16, P4-17).
• Rapid acceleration or deceleration demand exceeding the drive's and motor's torque capabilities for the set ramp times.
• Incorrectly set torque limits (e.g., P4-16 Torque Limit Motor Mode) that are too restrictive for the application's actual demands.
• Feedback sensor (e.g., encoder) issue leading to inaccurate speed or position data, causing the control loop to command excessive torque.
• Motor parameter misconfiguration (e.g., P1-20, P1-21) leading to incorrect torque estimation by the drive.

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1. 1

   Review parameter 4-16 (Torque Limit Motor Mode) and 4-17 (Torque Limit Generator Mode) settings against application requirements and motor capabilities.

2. 2

   Monitor instantaneous motor torque (e.g., P16-24) during operation to identify when the limit is exceeded.

3. 3

   Inspect the mechanical load for binding, obstructions, or sudden changes in friction that would demand high torque.

4. 4

   Increase acceleration and deceleration ramp times (e.g., P3-41, P3-42) to reduce instantaneous torque demands.

5. 5

   If operating in closed loop, verify encoder feedback integrity (e.g., signal level, proper counts) using drive diagnostics (P16-52).