Too Many Speed Search Restarts

What does SEr mean?

The drive has attempted Speed Search more times than the limit set in parameter b3-19. This typically indicates that the Speed Search parameters are incorrectly configured or that the motor is coasting in the opposite direction of the commanded run.

• Speed search acceleration time (b3-04) set too short for the load inertia, preventing successful synchronization.
• Speed search starting frequency (b3-05) configured too high or low relative to the actual coasting motor speed.
• Motor being actively driven by another device or exhibiting unexpected behavior during speed search attempts.
• Number of allowed speed search restart attempts (b3-19) set too low for application variability.
• Excessive mechanical friction or external forces preventing the motor from freely coasting.

Click steps to track your progress.

1. 1

   1. Increase the speed search restart limit parameter (b3-19) to a higher value (e.g., 5 or 10) to allow more attempts.

2. 2

   2. Extend the speed search acceleration time parameter (b3-04) to provide more duration for the drive to synchronize with motor speed.

3. 3

   3. Adjust the speed search starting frequency (b3-05) closer to the expected initial motor speed.

4. 4

   4. Confirm the motor is truly coasting and not being actively driven or braked by an external mechanism during speed search.

5. 5

   5. Check for excessive mechanical friction or load resistance that could prevent the drive from successfully identifying the motor's speed.

6. 6

   6. Monitor motor current and speed feedback during speed search attempts using drive diagnostics to identify synchronization issues.