ACS355 VFD showing 0012 MOTOR STALL fault, what should I check?
I have an ACS355 VFD that keeps tripping with a 0012 MOTOR STALL fault. The motor seems to be running fine sometimes, but then it just stops. What should I check first to troubleshoot this?
A 0012 MOTOR STALL fault on an ACS355 drive indicates the motor is operating in a stall region, often due to excessive load or insufficient motor power. This means the motor is trying to turn but cannot overcome the resistance, leading to a rapid increase in current. You should first check the mechanical load on the motor and verify the drive and motor ratings.
Likely causes and checks
1Excessive Mechanical Load
- Points to it
- The motor is trying to operate but cannot move, or is moving very slowly, while drawing high current. This is the most common reason for a stall.
- Check
- Isolate and lock out the equipment. Manually try to turn the driven equipment to check for binding, seized bearings, or obstructions. Verify that the process load has not increased beyond the motor's capacity.
2Insufficient Motor Power or Undersized Drive
- Points to it
- The motor may be struggling to start or maintain speed under normal load, indicating it's not powerful enough for the application, or the drive is undersized for the motor.
- Check
- Compare the motor's rated power and current to the drive's output ratings. Ensure the motor is correctly sized for the application. Check the drive's fault function parameters 3010...3012 related to motor stall settings.
Next check: After checking the mechanical load and drive/motor sizing, review the drive's fault function parameters 3010...3012. If the issue persists, consider checking for electrical interference or issues with motor connections.
What it typically looks like in the data
Related questions
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