Reference Handling - Danfoss FC 300 Design Manual

3. Introduction to FC 300

3.2.9. Reference Handling

References and feedback can be scaled in physical units (i.e., RPM, Hz, °C) or simply in % relating
to the values of par. 3-02
In this case, all analog and pulse inputs are scaled according to the following rules:
•
3
•
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 is 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
In this case, the subsequent relations be-
tween the resulting reference (after clamping)
and the sum of all references are as shown to
the right.
28
Minimum Reference
Reference Range
When par. 3-00
can be any unit, such as rpm, m/s, bar, etc. 100% reference equals the Max (abs (par.
3-03 Maximum Reference), abs (par. 3-02 Minimum Reference).
Reference Range
When par. 3-00
reference equals -Max Reference 100% reference equals Max Reference.
When par. 3-00 Reference Range
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
, 3-02
Minimum Reference
Configuration Mode
is set to [3] Process.
MG.33.B9.22 - VLT
Maximum Reference
and par. 3-03
: [0] Min - Max 0% reference equals 0 [unit] where unit
: [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-
Minimum Reference
and 3-03
® is a registered Danfoss trademark.
FC 300 Design Guide
.
Maximum Reference
together