6.4 Par. Group 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
parameter 3-00 Reference Range
is set to
[0] Min.- Max.
.
The minimum reference unit matches:
•
The choice of configuration in
parameter 1-00 Configuration Mode
: for
[1]
Speed closed loop
.
•
The unit selected in
parameter 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
(
parameter 3-03 Maximum
Reference
) or as a percentage of the other
external references. If a Ref
MIN
0
(
parameter 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 %
*
[0 -
100 %]
Enter a percentage (relative) value to be either
added to or deducted from the actual reference
for Catch up or Slow down respectively. If
Catch up
is selected via one of the digital inputs
(
parameter 5-10 Terminal 18 Digital Input
to
parameter 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 (
parameter 5-10 Terminal 18 Digital
Input
to
parameter 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
Parameter Descriptions
VLT
®
Compressor Drives CDS 302/CDS 303
54
Danfoss A/S © Rev. 2013-07-03 All rights reserved.
MG34M422
6
6
Содержание VLT CDS 303
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