Motor blocked

What does dEr mean?

This fault indicates that the motor's shaft is prevented from rotating or is rotating significantly slower than commanded, likely due to a mechanical obstruction or excessive load. By default, this critical condition triggers a full TRIP, inhibiting all ignition pulses and resetting the Ready signal to prevent motor damage, overheating, or mechanical stress on the system. Manual reset is required.

• Mechanical obstruction in the driven machinery (e.g., jammed conveyor, seized bearing, foreign object).
• Excessive mechanical load applied to the motor shaft, exceeding its rated torque capability.
• Brake system failing to release completely (e.g., P7-01 brake control output not energizing fully).
• Motor bearings are seized or heavily degraded, creating high friction and preventing rotation.
• Drive output current limit (e.g., P1-55) is set too low to overcome the initial starting torque of the load.

Click steps to track your progress.

1. 1

   Perform a lockout/tagout procedure. Manually attempt to rotate the motor shaft to identify physical obstructions.

2. 2

   Measure the actual current drawn by the motor during attempted startup and compare to drive current limit (P1-55) and motor rated current (P0-03).

3. 3

   Disconnect the motor from the driven load (e.g., uncouple shaft, remove belt) and attempt to run the motor standalone to isolate the issue.

4. 4

   Inspect the motor brake mechanism for proper release; verify brake coil voltage (e.g., 24VDC) and current (e.g., 0.5A) at the brake terminals.

5. 5

   Check the mechanical condition of the driven equipment (e.g., gearbox backlash, bearing temperature, lubrication levels).

6. 6

   Review the drive's current limit parameter (e.g., P1-55) and the motor's rated current (P0-03) for proper configuration relative to the application.