5.5 Reference Handling
5.5.1 Bus Speed Reference Value
In Drive-Profile (par. O-10 = [0] Drive profile) the reference is scaled as a normalized relative value in percent. The value is transmitted in hexadecimal:
0% = 0hex
100% = 4000hex
-100% = C000hex
Depending of the setting of par. F-50
Reference Range
, the reference is scaled from – Max. to + Max. or from Min. to Max.
The actual reference [Ref. %] in the drive depends on the settings in the following parameters:
Par. F-04
Base Frequency
Par. P-06
Base Speed
Par. F-52
Minimum Reference
Par. F-53
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 network only, ensure that all
other reference inputs are zero.
This means that digital and analogue input terminals should not be used for reference signals. The default setting (0%) should be maintained for preset references
in par. C-05
Multi-step Frequency 1 - 8
.
NB!
If the bus speed reference is negative, and the control word contains a run reverse signal, the drive will run clockwise (- - is +).
MAV is scaled in the same way as the reference.
Modbus TCP
31
5
