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The two types of reference inputs are combined in the following formula: Remote reference = X + X * Y / 100%. If relative reference is not used par.
3-18 must be set to
No function
and par. 3-14 to
0%
. The
catch up / slow-down
function and the
freeze reference
function can both be activated by
digital inputs on the adjustable frequency drive. The functions and parameters are described in the Programming Guide, MG33MXYY.
The scaling of analog references are described in par. groups 6-1* and 6-2*, and the scaling of digital pulse references are described in par. group 5-5*.
Reference limits and ranges are set in par. group 3-0*.
3.3.1 Reference Limits
Par. 3-00
Reference Range
, par. 3-02
Minimum Reference
and par. 3-03
Maximum Reference
together 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
references is shown below.
The value of par. 3-02
Minimum Reference
cannot be set to less than 0,
unless the par. 1-00
Configuration Mode
is set to [3] Process. In this case,
the subsequent relations between the resulting reference (after clamp-
ing) and the sum of all references are as shown to the right.
3.3.2 Scaling of Preset References and Bus References
Preset references are scaled according to the following rules:
•
When par. 3-00
Reference Range
: [0] Min–Max 0% reference equals 0 [unit] where unit 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
Minimum Reference
)).
•
When par. 3-00
Reference Range
: [1] -Max–+Max 0% reference equals 0 [unit] -100% reference equals -Max Reference 100% reference equals
Max Reference.
Bus references are scaled according to the following rules:
•
When par. 3-00
Reference Range
: [0] Min - Max. To obtain max resolution on the bus reference the scaling on the bus is: 0% reference equals
Min Reference and 100% reference equals Max reference.
•
When par. 3-00
Reference Range
: [1] -Max–+Max -100% reference equals -Max Reference 100% reference equals Max Reference.
FC 300 Design Guide
3 Introduction to AutomationDrive FC 300
MG.33.BC.22 - VLT
®
is a registered Danfoss trademark
3-11
3