Speed deviation

What does A00544 mean?

This alarm signifies that the actual motor speed has either exceeded its maximum limit or deviates significantly from the setpoint, as indicated by status bits r2197.12 or r2197.7. This often points to an excessive motoring or regenerative load on the drive, or poor tuning of the speed controller.

• Excessive mechanical load suddenly applied to the motor shaft, causing the motor speed to drop significantly below its setpoint.
• Motor encoder feedback signal loss or corruption (e.g., A00564, A00590), leading to inaccurate speed measurement and control.
• Speed controller tuning parameters (e.g., P1460 - Kp, P1470 - Ki) are too low or incorrect for the application's inertia and dynamics.
• Incorrect motor parameters (e.g., P0304 - rated current, P0305 - rated speed) resulting in poor motor model estimation.
• A break in the motor power circuit (e.g., open phase, fuse blown) preventing the motor from developing sufficient torque.
• The actual speed exceeds the maximum permitted speed (e.g., P1082) or deviates from the setpoint beyond the tolerance defined by P2168.

Click steps to track your progress.

1. 1

   1. Check the mechanical system for obstructions, seizing bearings, or excessive load that might be impeding motor rotation.

2. 2

   2. Verify the integrity of the encoder cable, connections, and signals (e.g., A/B/Z phases) using an oscilloscope at the drive input terminals.

3. 3

   3. Adjust the speed controller's proportional gain (P1460) and integral time (P1470) to improve dynamic response and reduce deviation.

4. 4

   4. Confirm all motor nameplate parameters (P0304-P0311) are accurately entered into the drive and perform motor identification (P1910) if necessary.

5. 5

   5. Monitor the actual motor current (r0027) during operation to detect signs of motor overload or single-phasing.

6. 6

   6. Check the maximum speed limit (P1082) and the speed deviation tolerance (P2168) to ensure they are appropriate for the application.