Stall Prevention (Overcurrent)

What does Stall prevention (overcurrent) mean?

The overcurrent stall prevention function has been activated. This warning indicates that the motor is encountering excessive current, possibly due to overload, insufficient acceleration time, improper torque boost settings, or mechanical binding. While a warning, prolonged activation can lead to motor or inverter damage.

• Mechanical overload on the motor shaft, exceeding the motor's rated torque (e.g., jammed conveyor, worn bearings).
• Acceleration time (e.g., Pr. 7 Acceleration time 1) is set too short for the inertia of the load, causing excessive current during startup.
• Motor magnetic flux is too high due to incorrect motor parameters (e.g., Pr. 80 Motor capacity, Pr. 81 Motor rated current) or excessive voltage boost (Pr. 0 Voltage boost).
• Poor motor cable condition (e.g., frayed insulation, improper shielding) leading to current leakage or phase imbalance.
• Stall prevention level (e.g., Pr. 15 Current stall prevention level) set too low for the application's normal operating conditions.

Click steps to track your progress.

1. 1

   Visually inspect the mechanical load connected to the motor shaft for any obstructions, binding, or excessive friction.

2. 2

   Increase the acceleration time (e.g., Pr. 7) in 1-second increments and monitor motor current during startup.

3. 3

   Verify motor nameplate data against inverter parameters Pr. 80 (Motor capacity) and Pr. 81 (Motor rated current).

4. 4

   Measure the motor phase currents (U, V, W) using a clamp meter during operation to identify potential imbalances or excessive current draw.

5. 5

   Adjust Pr. 15 (Current stall prevention level) to a higher percentage of rated current, ensuring it remains below the motor's thermal limit.