Cause : DC link voltage maximum controller de-activated comes when he Vdc_max controller can no longer maintain the DC link voltage (r0070) below the limit value (r1242, r1282) and was therefore switched out (disabled).

- the line supply voltage is permanently higher than specified for the power unit.
- the motor is permanently in the regenerative mode as a result of a load that is driving the motor.

- check whether the input voltage is within the permissible range.
- check whether the load duty cycle and load limits are within the permissible limits