Operating Instructions ACU
18.5.7.1 Limitation of modulation controller
The output signal of the modulation controller is the internal reference flux. The controller output and
integrating component are limited via parameter Reference Imr Lower Limit 755 and the product of
Rated Magnetising Current 716 and Reference Flux 717. The upper limiting parameter Magnetising
Current is to be set to the rated value of the machine. For the lower limit, select a value which also
builds up an adequate flux in the machine in the field weakening area. The limitation of the control
deviation at the output of the modulation controller prevents a possible oscillation of the control loop
in the case of load surges. The parameter Control Deviation Limitation 756 is stated as an absolute
value and acts both as a positive and a negative limit.
Reference Imr Lower Limit
Control Deviation Limitation
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