Scaling Of References And Feedback - Danfoss VLT AutomationDrive FC 300 Design Manual

FC 300 Design Guide
In that case all analog and pulse inputs are scaled according to the following rules:
•
•
Bus references are scaled according to the following rules:
•
•
Par. 3-00
define the allowed range of the sum of all references. The sum of all references are clamped when
necessary. The relation between the resulting reference (after clamping) and the sum of all ref-
erences is shown below.
The value of par. 3-02
can not be set to less than 0, unless the par.
1-00 Configuration Mode
In that case the following relations between
the resulting reference (after clamping) and
the sum of all references is as shown to the
right.

3.2.10. Scaling of References and Feedback

References and feedback are scaled from analog and pulse inputs in the same way. The only
difference is that a reference above or below the specified minimum and maximum "endpoints" (P1
and P2 in the graph below) are clamped whereas a feedback above or below is not.
Reference Range
When par. 3-00
can be any unit e.g. rpm, m/s, bar etc. 100% reference equals the Max (abs (par. 3-03
Maximum Reference
), abs (par. 3-02
When par. 3-00 Reference Range
reference equals -Max Reference 100% reference equals Max Reference.
Reference Range
When par. 3-00
reference the scaling on the bus is: 0% reference equals Min Reference and 100% ref-
erence equals Max reference.
Reference Range
When par. 3-00
erence 100% reference equals Max Reference.
Reference Range Minimum Reference
, 3-02
Minimum Reference
is set to [3] Process.
MG.33.B9.02 - VLT ® is a registered Danfoss trademark
: [0] Min - Max 0% reference equals 0 [unit] where unit
Minimum Reference
)).
: [1] -Max - +Max 0% reference equals 0 [unit] -100%
: [0] Min - Max. To obtain max resolution on the bus
: [1] -Max - +Max -100% reference equals -Max Ref-
Maximum Reference
and 3-03
3. Introduction to FC 300
together
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