6.4 Parameters: 3 -** Reference/Ramps
6.4.1 3-0* Reference Limits
Parameters for reference handling, definition of limitations,
and configuration of the reaction of the frequency
converter to changes.
3-00 Reference Range
Option:
Function:
Select the range of the reference signal and
the feedback signal. Signal values can be
positive only, or positive and negative. The
minimum limit may have a negative value,
unless
[1] Speed closed loop
control is selected
in
1-00 Configuration Mode
.
[0]
*
Min. - Max
For positive values only
[1]
-Max -
+Max
For both positive and negative values
3-01 Reference/Feedback Unit
Option:
Function:
Select the unit to be used in Process PID Control
references and feedbacks.
[0]
None
[71]
*
bar
[60]
°C
[160] °F
[170] psi
3-02 Minimum Reference
Option: Function:
Enter the minimum reference. The minimum reference
is the lowest value obtainable by summing all
references. Minimum reference is active only when
3-00 Reference Range
is set to
[0] Min.- Max.
.
The minimum reference unit matches:
•
The choice of configuration in
1-00 Configu-
ration Mode
: for
[1] Speed closed loop
.
•
The unit selected in
3-01 Reference/Feedback
Unit
.
3-03 Maximum Reference
Option:
Function:
Enter the maximum reference.
3-10 Preset Reference
Array [8]
0.00%
*
[-100.00
- 100.00
%]
Must remain 0 for Open Loop Control.
The preset reference is stated as a percentage
of the value Ref
MAX
(
3-03 Maximum Reference
)
or as a percentage of the other external
references. If a Ref
MIN
0 (
3-02 Minimum
Reference
) is programmed, the preset
reference is calculated as a percentage of the
full reference range, i.e. on the basis of the
difference between Ref
MAX
and Ref
MIN
.
Afterwards, the value is added to Ref
MIN
.
When using preset references, select
[16]
Preset ref. bit 0, [17] Preset ref. bit 1
or
[18]
Preset ref. bit 2
for the corresponding digital
inputs in parameter group
5-1* Digital Inputs
.
3-12 Catch up/slow Down Value
Range:
Function:
0.00
%
*
[0.00 -
100.00 %]
Enter a percentage (relative) value to be
either added to or deducted from the actual
reference for Catch up or Slow down respec-
tively. If
Catch up
is selected via one of the
digital inputs (
5-10 Terminal 18 Digital Input
to
5-15 Terminal 33 Digital Input
), the percentage
(relative) value is added to the total reference.
If
Slow down
is selected via one of the digital
inputs (
5-10 Terminal 18 Digital Input
to
5-15 Terminal 33 Digital Input
), the percentage
(relative) value is deducted from the total
reference. Obtain extended functionality with
the DigiPot function. See parameter group
3-9* Digital Potentiometer
.
3-13 Reference Site
Option:
Function:
Select which reference site to activate.
[0] Linked to
Hand / Auto
Use the local reference when in Hand mode;
or the remote reference when in Auto mode
[1] Remote
Use the remote reference in both Hand
mode and Auto mode
[2] Local
Use the local reference in both Hand mode
and Auto mode
3-14 Preset Relative Reference
Range:
Function:
0.00%
*
[-100.00 -
100.00 %]
Define a fixed value (in %) to be added to
the variable value (defined in
3-18 Relative
Scaling Reference Source
). The sum of the
fixed and variable values is multiplied with
the actual reference. This product is then
added to the actual reference (X+X*Y/100)
to give the resultant actual reference.
3-15 Reference Resource 1
Option:
Function:
Select the reference input to be used
for the first reference signal.
3-15 Reference Resource 1
,
3-16 Reference Resource 2
and
3-17 Reference Resource 3
define up to
three different reference signals. The
sum of these reference signals defines
the actual reference.
[0]
No function
Parameter Descriptions
Operating Instructions VLT
®
CDS302 and CDS303
MG34M302 - VLT
®
is a registered Danfoss trademark/Commercial Compressor
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