TACH LOSS FAULT

What does 98 mean?

The DSD 412 drive does not detect encoder velocity in proportion to the armature voltage, indicating a loss of speed feedback. This fault is related to functions #14 and #15.

• The encoder is not functioning correctly or has completely failed.
• Loose electrical connections in the encoder wiring circuit.
• High resistance in the motor, requiring an increase in the value of parameter #14.
• The contactor feedback circuit at A1TB1-7 closes prematurely before the armature power poles engage, as per the timing diagram on page 49.

Click steps to track your progress.

1. 1

   Verify that the encoder is operating correctly by checking its output signals.

2. 2

   Ensure all encoder connections are secure and tight.

3. 3

   Raise the value of parameter #14 if the motor exhibits high resistance.

4. 4

   Refer to the timing diagram on page 49 and ensure the contactor feedback circuit at A1TB1-7 does not close before the armature power poles.