Danfoss VLT CANopen MCA 105 Programming Manual

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Danfoss VLT CANopen MCA 105 Programming Manual Manual pdf 27 page image

4.5 Reference HandlingIn both FC profile and CANopen DSP 402, the reference is scaled as a normalised relative value in percent. The value istransmitted in hexadecimal:• 0% = 0 hex.• 100% = 4000 hex.• -100% = C000 hex.Depending of the setting of parameter 3-00 Reference Range, the reference is scaled from – Maximum to + Maximum or fromMinimum to Maximum.Illustration 4.7 Reference HandlingThe actual reference [Ref. %] in the frequency converterdepends on the settings in the following parameters:• Parameter 1-23 Motor Frequency.• Parameter 1-25 Motor Nominal Speed.• Parameter 3-02 Minimum Reference.• Parameter 3-03 Maximum Reference.All references provided to the frequency converter areadded to the total reference value.If a reference is to be controlled by the fieldbus only,ensure that all other reference inputs are 0.This means that digital and analog input terminals shouldnot be used for reference signals.Maintain the default setting (0%) for preset references inparameter 3-10 Preset Reference.If the bus speed reference is negative, and the controlword contains a run reverse signal, the frequency converterruns clockwise (- - is +).MAV is scaled in the same way as the reference.Control Programming GuideMG92G102 Danfoss A/S © 06/2015 All rights reserved. 254 4