Overtorque Detection 2

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This fault signifies a mechanical issue with the machine, such as a lock, or improperly set load parameters. The drive detects this fault if the output current surpasses the threshold defined by L6-05 for a period longer than L6-06. Ignoring this fault can lead to significant mechanical stress and potential equipment failure.

• Sudden increase in load demand exceeding the motor's or drive's instantaneous torque capability.
• Incorrectly configured Overtorque Detect Level 2 (L6-05) or Overtorque Detect Time 2 (L6-06).
• Bearing failure or excessive friction within the driven equipment causing increased resistance to rotation.
• Motor winding deterioration leading to reduced efficiency and increased current draw for a given torque.
• Drive current sensor calibration drift or failure, providing inaccurate current readings.

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1. 1

   1. Adjust parameter L6-05 (Overtorque Detect Level 2) and L6-06 (Overtorque Detect Time 2) to match application transients.

2. 2

   2. Measure motor current (e.g., using a clamp meter on output phase U) and compare it to the drive's display (U1-04).

3. 3

   3. Disconnect the motor from the load and run it in no-load condition to check for internal motor issues.

4. 4

   4. Inspect mechanical bearings and gears of the driven machine for excessive wear, lubricant loss, or damage.

5. 5

   5. Ensure the motor's cooling fan is operating effectively, as overheating can reduce torque capability.

6. 6

   6. Perform an encoder alignment check if using vector control, as misaligned feedback can cause overcurrent.