Motor Stall Fault

What does 06 mean?

This fault indicates that the connected motor has stalled, meaning it is not rotating or is rotating significantly slower than commanded. The primary cause is an excessive mechanical load on the motor, preventing it from turning freely. Continuing to operate under stall conditions can lead to motor and controller overheating and damage.

• Mechanical jamming or obstruction in the driven machinery (e.g., conveyor belt jammed, pump impeller blocked).
• Excessive friction in bearings or gearboxes of the driven equipment due to lack of lubrication or damage.
• Incorrectly sized motor or controller for the application's required torque (e.g., motor rated torque < load demand).
• Parameter P2-07 (Stall Prevention Level) set too low, tripping prematurely for legitimate load variations.
• Faulty motor windings (e.g., shorted turns) or rotor cage, reducing motor's ability to produce torque.

Click steps to track your progress.

1. 1

   1. Decouple the motor from the driven load if possible. Test motor operation independently to determine if the fault is with the motor or the load.

2. 2

   2. Manually rotate the driven mechanical system to identify any jamming, high friction points, or obstructions.

3. 3

   3. Measure the motor current (e.g., using a clamp meter on U, V, or W output lines) during operation and compare to the motor's rated current and controller's output.

4. 4

   4. Increase the value of parameter P2-07 (Stall Prevention Level) if the load has legitimate temporary peaks, but ensure it does not compromise motor protection.

5. 5

   5. Verify motor winding resistance (U-V, V-W, W-U) with an ohmmeter. Compare values for symmetry and against manufacturer specifications (e.g., 1.5 Ohms +/-5%).