What is A6A4 Motor nominal value fault in ABB ACS880 drive?

A6A4 Motor Nominal Value fault on an ABB ACS880 drive means the drive has detected an inconsistency in the motor data you’ve entered.

This fault is essentially a "logic check" failure. The drive’s internal firmware compares the values in Parameter Group 99 and determines that the physics of the motor you described don't make sense.

A6A4: Causes and Remedies Table

Probable Cause	Detailed Explanation	Corrective Remedy
Incorrect Speed (RPM)	Entering the "Synchronous" speed (e.g., 1500 or 1800) instead of the "Rated" speed (e.g., 1475 or 1760).	Check the motor nameplate. Enter the exact Nominal Speed (including slip) into Par. 99.09.
Power/Current Mismatch	The entered Power (kW/hp) is mathematically impossible given the Voltage and Current.	Verify 99.06 (Current) and 99.10 (Power). Ensure 96.16 is set to the correct unit (kW vs hp).
Voltage/Wiring Conflict	The motor is wired for Delta ($\Delta$) but the drive is programmed for Star ($Y$) voltage (or vice versa).	Match 99.07 (Nominal Voltage) to the physical jumper bars in the motor terminal box.
Incomplete ID Run	In DTC (Direct Torque Control) mode, the drive requires a precise mathematical model of the motor.	Perform a Motor ID Run via Par. 99.13. Use "Normal" or "Reduced" mode if the motor can be uncoupled.
Motor Size Mismatch	The motor is significantly smaller than the drive's frame size (usually < 1/10th of drive rating).	Verify that the drive is sized appropriately for the motor. Switch to Scalar Control (99.04) if the motor is very small.