Auto Tach Switch

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This fault indicates a problem with the drive's feedback system, where either the tach switch has occurred while the alternate feedback device failed, or the tach switch has not occurred, the Auto Tach Switch option is enabled, and both primary and alternate devices have failed. This condition directly impacts speed control and feedback integrity, potentially leading to unstable operation or unexpected drive behavior if not resolved.

• Primary motor feedback device (e.g., encoder) failure causing the drive to switch to alternate tachometer feedback.
• Open circuit or high resistance in the tachometer feedback wiring between the tachogenerator and drive input terminals (e.g., TB3-1, TB3-2).
• Mechanical damage or wear to the tachometer generator (e.g., worn brushes, pitted commutator, loose coupling).
• Incorrect configuration of the drive's feedback parameter (e.g., P5-01 is not set correctly for tachometer operation).
• Signal noise or interference on the tachometer feedback lines, possibly due to inadequate shielding or grounding.

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1. 1

   1. Verify the integrity and continuity of wiring for the primary feedback device (e.g., encoder terminals X1-A, X1-B) and its power supply (e.g., 5VDC).

2. 2

   2. With the motor rotating, measure the AC voltage output of the tachometer generator directly at its terminals and at the drive input (e.g., TB3-1, TB3-2).

3. 3

   3. Inspect the tachometer generator brushes for wear (replace if less than 1/4 inch remaining) and the commutator for signs of pitting or scoring.

4. 4

   4. Check drive parameter P5-01 (Feedback Source Select) to ensure it is correctly configured for the motor's installed feedback type (e.g., "Tachometer").

5. 5

   5. Confirm the mechanical coupling between the motor shaft and the tachometer generator is secure and free from slippage or excessive play.