Operating Instructions ACU
The voltage controller uses the limit values of the DC link voltage. Acceleration on Mains
Resumption 674 replaces - if the default value is changed - the set ramp parameter values
Acceleration (Clockwise) 420 or Acceleration Anticlockwise 422. The voltage control in a mains
failure changes from the frequency limit Shutdown Threshold 675 from Reference Mains Support
Value 672 to Reference Shutdown Value 676. The value of Gen. Ref. Current Limit 683 (2xx, 4xx,
5xx) or the ramp Mains Support Deceleration 673 (V/f) defines the maximum deceleration gradient
to the Reference Shutdown Value 676. Mains Support Deceleration 673 is only active if the actual
frequency is smaller than Shutdown Threshold 675.
Mains support deceleration
Acceleration on mains
resumption
Mains Support Deceleration 673 is active in Configuration 1xx (V/f).
Gen. Ref. Current Limit 683 is active in Configuration 2xx, 4xx, 5xx and 6xx (FOR and
SERVO).
The proportional and integrating component of the current controller can be set via parameters
Amplification 677 and Integral Time 678. The control functions are deactivated by setting the
parameters to 0. The controllers are P and I controllers in the corresponding settings.
The factory settings depend on the selected configuration and control procedure. According to the
setup of parameter Configuration 30, there is the following assignment.
1)
Configurations 1xx
2)
Configurations 4xx, 2xx, 5xx, 6xx
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