Danfoss FC 300 Design Manual page 22

FC 300 Design Guide
Par. 1-00 Configuration Mode determines what kind of application control principle (i.e. Speed, Torque
or Process Control) is used when the Remote reference is active (see table above for the conditions).
Par. 1-05 Local Mode Configuration determines the kind of application control principle that is used when
the Local reference is made activate.
Reference Handling
Local Reference
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 parts:
1. X (the external reference) : A sum (see par. 3-04) of up to four externally selected references,
comprising any combination (determined by the setting of par. 3-15, 3-16 and 3-17) of a fixed
preset reference (par. 3-10), variable analog references, variable digital pulse references, and
various serial bus references in whatever unit frequency converter are controlled ([Hz], [RPM],
[Nm] etc.).
2. Y- (the relative reference): A sum of one fixed preset reference (par. 3-14) and one variable
analog reference (par. 3-18) in [%].
The two parts are combined in the following calculation: Remote reference = X + X * Y / 100%. The
catch up / slow down function and the freeze reference function can both be activated by digital inputs
on the frequency converter. They are described in par. group 5-1*.
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*.
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Introduction to FC 300
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