AMA: Motor too big

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The connected motor is too large for the Automatic Motor Adaptation (AMA) function to operate successfully with the current drive sizing or parameter limits. This means the drive cannot accurately identify the motor's characteristics, leading to an inability to optimize control.

• The connected motor's nominal current (P1-24) or power (P1-22) significantly exceeds the drive's output capacity.
• Drive output current limit (e.g., P4-18) is set too low relative to the motor's actual size.
• Motor impedance is too low for the drive to accurately characterize during AMA.
• Incorrect drive sizing for the application, an undersized drive is installed.
• Parameter range limits within the drive's AMA algorithm prevent characterization of oversized motors.

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1. 1

   1. Verify the frequency converter's rated output current (from nameplate) against the motor's nominal current (P1-24).

2. 2

   2. Confirm the motor's power rating (P1-22) is within the drive's specified maximum motor power range.

3. 3

   3. If safe, temporarily reduce Parameter P1-24 (Motor Current) slightly and retry AMA (only if motor is marginally oversized).

4. 4

   4. Measure motor winding resistance to ensure it is within expected values for a motor of its rated power and voltage.

5. 5

   5. If the motor is genuinely too large, replace the drive with one that has adequate power and current ratings.