Cause : DC link voltage maximum controller active comes when the DC link voltage controller has been activated because the upper switch-in threshold has been exceeded (r1242, r1282).

1. The ramp-down times are automatically increased in order to maintain the DC link voltage (r0070) within the permissible limits. There is a system deviation between the setpoint and actual speeds.
2. When the DC link voltage controller is switched out (disabled), this is the reason that the ramp-function generator output is set to the speed actual value. See also: r0056 (Status word, closed-loop control), p1240 (Vdc controller configuration (vector control)), p1280 (Vdc controller configuration (U/f)).

If the controller is not to intervene:

- increase the ramp-down times.
- switch-off the Vdc_max controller (p1240 = 0 for vector control, p1280 = 0 for U/f control). If the ramp-down times are not to be changed:
- use a chopper or regenerative feedback unit.