Danfoss FC 300 Design Manual page 25

FC 300 Design Guide
3.3 Reference Handling
Local Reference
The local reference is active when the drive is operated with 'Hand On' bottom active. Adjust the reference by up/down and left/right arrows respectively.
Remote Reference
The reference handling system for calculating the Remote reference is shown in the illustration below.
The Remote Reference is calculated once every scan interval and initially consists of two types of reference inputs:
1. X (the external reference) : A sum (see par. 3-04
(determined by the setting of par. 3-15
preset reference (par. 3-10
whatever unit the frequency converter is controlled ([Hz], [RPM], [Nm] etc.).
2. Y- (the relative reference): A sum of one fixed preset reference (par. 3-14
Relative Scaling Reference Resource
(par. 3-18
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.
No function
3-18 must be set to and par. 3-14 to
digital inputs on the frequency converter. The functiions 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*.
Reference Function
Reference Resource 1
, par. 3-16
Preset Reference
), variable analog references, variable digital pulse references, and various serial bus references in
) in [%].
0% catch up / slow down
. The
MG.33.BC.02 - VLT ® is a registered Danfoss trademark
3 Introduction to AutomationDrive FC 300
) of up to four externally selected references, comprising any combination
Reference Resource 2
and par. 3-17
Preset Relative Reference
) and one variable analog reference
freeze reference
function and the
Reference Resource 3
) of a fixed
function can both be activated by
3
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