Feedback error

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An inconsistency has occurred between the calculated motor speed and the speed measurement received from the feedback device (e.g., encoder). This indicates a potential issue with the feedback device, its wiring, or the drive's speed calculation, which can lead to unstable speed control or unexpected motor behavior.

• Damage to the encoder feedback cable or poor connection at the drive's feedback terminals.
• Faulty encoder device itself (e.g., internal damage, dirty optics, bearing wear).
• Incorrect encoder PPR (Pulses Per Revolution) setting (P7-10) in the drive's parameters.
• Mechanical slippage or misalignment between the encoder shaft and the motor shaft.
• Excessive electrical noise or interference on the encoder signal lines.
• Motor operating in a highly dynamic or unstable manner that exceeds encoder tracking ability.

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1. 1

   1. Verify physical connection of the encoder cable to the drive's feedback terminals (e.g., terminals 32-35).

2. 2

   2. Inspect the encoder cable for insulation damage, cuts, or crimping along its entire length.

3. 3

   3. Confirm Parameter P7-10 (Encoder Pulses/Rev) precisely matches the actual PPR rating of the installed encoder.

4. 4

   4. Check for voltage output from the drive's encoder power supply terminals (e.g., terminal 50) using a voltmeter.

5. 5

   5. Use an oscilloscope to check the encoder A/B/Z phase signals at the drive's feedback input terminals for clean waveforms.

6. 6

   6. Check for mechanical play or looseness in the encoder coupling or mounting to the motor shaft.