4.5 Reference Handling
In both FC prole and CANopen DSP 402, the reference is scaled as a normalised relative value in percent. The value is
transmitted 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 from
Minimum to Maximum.
Illustration 4.7 Reference Handling
The actual reference [Ref. %] in the frequency converter
depends 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 are
added to the total reference value.
If a reference is to be controlled by the eldbus only,
ensure that all other reference inputs are 0.
This means that digital and analog input terminals should
not be used for reference signals.
Maintain the default setting (0%) for preset references in
parameter 3-10 Preset Reference.
If the bus speed reference is negative, and the control
word contains a run reverse signal, the frequency converter
runs clockwise (- - is +).
MAV is scaled in the same way as the reference.
Control Programming Guide
MG92G102 Danfoss A/S © 06/2015 All rights reserved. 25
4 4
To Next Page
Loading...
