Cause : Vdmax controller inhibit comes when the line voltage is too high or the drive line voltage (P071) is incorrectly parameterized. The Vdmax controller is disabled despite parameter access (P515), as otherwise the motor would accelerate immediately in operation to the maximum frequency.

The A041 alarm in siemens master drive a Vdmax controller inhibited condition. This indicates an issue related to the drive's internal control mechanism for the maximum voltage applied to the motor.

• Check the line voltage.