TACH LOSS FAULT

What does 98 mean?

The drive does not detect encoder velocity in proportion to the armature voltage indication of speed. Refer to Function explanations for parameters #14 and #15.

• The encoder is not working.
• Loose connections for the encoder.
• Motor has high resistance, requiring adjustment of parameter #14.
• The contactor feedback circuit at A1TB1-7 closes before the armature power poles, indicating a timing issue.

Click steps to track your progress.

1. 1

   Verify that the encoder is working.

2. 2

   Inspect all encoder connections for tightness.

3. 3

   Raise the value for parameter #14 if the motor has high resistance.

4. 4

   Ensure that the contactor feedback circuit at A1TB1-7 closes only after the armature power poles; refer to the timing diagram on page 52.