Danfoss CANopen VLT Midi Drive FC 280 Programming Manual page 27

Control
4.4.4 Reference Handling
In the frequency converter profile, the reference is scaled as a normalized relative value in percent. The value is transmitted
in hexadecimal:
•
0% = 0 hex.
•
100% = 4000 hex.
•
-100% = C000 hex.
Depending on the setting in 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 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 should be controlled by the fieldbus 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.
MG07E102
Programming Guide
If the bus speed reference is negative, and the control
word contains a run-reverse signal, the frequency converter
runs clockwise (-x- gives +).
MAV is scaled in the same way as the reference.
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