Reference Handling - Danfoss VLT MCA 121 EtherNet/IP Manual

MCA 121 EtherNet/IP
Bit Number
8
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10
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5.4 Reference Handling

5.4.1 Bus Speed Reference Value under Instances 100-101-103/150-151-153
In FC-Profile (par. 8-10 = [0] FC 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. 3-00
The actual reference [Ref. %] in the VLT frequency converter depends on the settings in the following parameters:
Motor Frequency
Par. 1-23
Motor Nominal Speed
Par. 1-25
Par. 3-02 Minimum Reference
Maximum Reference
Par. 3-03
All references provided to the frequency converter are added to the total reference value. If a reference is to be controlled by the fieldbus 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
Preset Reference
references in par. 3-10
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.
Meaning
(Vendor specific)
Start up
Not ready
Ready
Enabled
Stopping
Fault stop
Faulted
Reference Range , the reference is scaled from – Max. to + Max. or from Min. to Max.
.
®
MG.90.J2.02 - VLT is a registered Danfoss trademark
For more detail of the actual output speed, see the section
speed under Instances 20/70 and 21/71
5 How to Control
Actual output
.
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