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.

Additional Steps

Steps 1–2 are listed in Priority Fix.

1. 3

   Verify motor brake operation: If a motor brake is present, ensure it is releasing fully when commanded.

2. 4

   Measure motor current: Monitor motor current during attempted start to detect high currents indicating mechanical resistance.

3. 5

   Check motor bearings: Listen for unusual noises from the motor bearings that could indicate failure.