Danfoss VLT FCD 311 Design Manual page 70

214 Reference function
214
(REF FUNCTION)
Value:
Sum (SUM)
Relative (RELA TIVE)
External/preset (EXTERNAL/PRESET)
Function:
It is possible to define how preset references are to
be added to the other references; for this purpose,
use Sum or Relative. It is also possible by using the
External/preset to select whether a shift between ex-
ternal references and preset references is required.
External reference is the sum of the analogue refer-
ences, pulse references and any references from
serial communication.
Description of choice:
If Sum [0] is selected, one of the adjusted preset ref-
erences (parameters 215-218 Preset reference) is
summarized as a percentage of the reference range
(Ref - Ref ), added to the other external refer-
MIN MAX
ences.
If Relative [1] is selected, one of the added preset
references (parameters 215-218 Preset reference) is
summarized as a percentage of the sum of present
external references
If External/preset [2] is selected, it is possible via a
digital input to shift between external references or
preset references. Preset references will be a per-
centage value of the reference range.
= factory setting. () = display text [] = value for use in communication via serial communication port
70
®
VLT FCD Series
NB!:
If Sum or Relative is selected, one of the
preset references will always be active. If the
preset references are to be without influence, they
must be set to 0% (factory setting).
215 Preset reference 1 (PRESET REF. 1)
215
216 Preset reference 2 (PRESET REF. 2)
216
217 Preset reference 3 (PRESET REF. 3)
217
218 Preset reference 4 (PRESET REF. 4)
218
Value:
-100.00% - +100.00%
of the reference range/external reference
Function:
Four different preset references can be programmed
in parameters 215-218 Preset reference.
The preset reference is stated as a percentage of
the reference range (Ref
[0]
centage of the other external references, depending
[1]
on the choice made in parameter 214 Reference
[2]
function. The choice between preset references can
be made via the digital inputs or via serial communi-
cation.
Preset ref., msb
0
0
1
1
Description of choice:
Set the preset reference(s) that is/are to be the op-
tions.
219 Catch up/Slow down reference 219
(CATCH UP/SLW DWN)
Value:
0.00 - 100% of the given reference
Function:
In this parameter, the percentage value can be set
which will either be added to or deducted from the
remote-controlled references.
The remote-controlled reference is the sum of preset
references, analogue references, pulse reference
and any references from serial communication.
Description of choice:
If Catch up is active via a digital input, the percent-
age value in parameter 219 Catch up/Slow down
MG.04.A1.02 - VLT is a registered Danfoss trade mark
- Ref ) or as a per-
MIN MAX
Preset ref. lsb
0 Preset ref. 1
1 Preset ref. 2
0 Preset ref. 3
1 Preset ref. 4
0.00%
0.00%