20-07 Feedback 3 Conversion
Option: Function:
See par. 20-01 Feedback 1 Conver-
sion for details.
[0]
*
Linear
[1] Square root
[2] Pressure to temperature
[3] Pressure to flow
[4] Velocity to flow
20-08 Feedback 3 Source Unit
Option: Function:
See par. 20-02 Feedback 1 Source Unit for details.
20-12 Reference/Feedback Unit
Option: Function:
See par. 20-02 Feedback 1 Source Unit for details.
20-13 Minimum Reference/Feedb.
Range: Function:
0.000
ProcessCtr-
lUnit
*
[Applica-
tion
depend-
ant]
Enter the desired minimum value for
the remote reference when operating
with par. 1-00 Configuration Mode set
for Closed Loop [3] operation. Units are
set in par. 20-12 Reference/Feedback
Unit.
Minimum feedback will be -200% of
either the value set in
par. 20-13 Minimum Reference/Feedb. or
in par. 20-14 Maximum Reference/
Feedb., which ever numeric value is the
highest.
NOTE
If operating with par. 1-00 Configuration Mode set for
Open Loop [0], par. 3-02 Minimum Reference must be
used.
20-14 Maximum Reference/Feedb.
Range: Function:
100.000
ProcessCtrlU-
nit
*
[Applica-
tion
dependant]
Enter the maximum reference/
feedback for closed loop operation.
The setting determines the highest
value obtainable by summing all
reference sources for closed loop
operation. The setting determines
100% feedback in open and closed
loop (total feedback range: -200% to
+200%).
NOTE
If operating with par. 1-00 Configuration Mode set for
Open Loop [0], par. 3-03 Maximum Reference must be
used.
NOTE
The dynamics of the PID controller will depend on the
value set in this parameter. Please see also par. 20-93 PID
Proportional Gain.
Par. 20-13 and par. 20-14 also determine the feedback
range when using feedback for display readout with
par. 1-00 Configuration Mode set for Open Loop [0].
Same condition as above.
20-20 Feedback Function
Option: Function:
This parameter determines how the three possible
feedbacks will be used to control the output
frequency of the frequency converter.
[0] Sum Sum [0] sets up the PID Controller to use the sum
of Feedback 1, Feedback 2 and Feedback 3 as the
feedback.
NOTE
Any unused feedbacks must be set to No
Function in par. 20-00 Feedback 1 Source,
par. 20-03 Feedback 2 Source, or
par. 20-06 Feedback 3 Source.
The sum of Setpoint 1 and any other references
that are enabled (see par. group 3-1*) will be used
as the PID Controller’s set-point reference.
[1] Difference Difference [1] sets up the PID controller to use the
difference between Feedback 1 and Feedback 2 as
the feedback. Feedback 3 will not be used with
this selection. Only Setpoint 1 will be used. The
sum of Setpoint 1 and any other references that
are enabled (see par. group 3-1*) will be used as
the PID controller’s set-point reference.
[2] Average Average [2] sets up the PID Controller to use the
average of Feedback 1, Feedback 2 and Feedback
3 as the feedback.
NOTE
Any unused feedbacks must be set to No
Function in par. 20-00 Feedback 1 Source,
par. 20-03 Feedback 2 Source, or
par. 20-06 Feedback 3 Source. The sum of
Setpoint 1 and any other references that
are enabled (see par. group 3-1*) will be
used as the PID Controller’s set-point
reference.
How to Programme the Frequ...
VLT
®
HVAC Drive Operating Instructions
MG.11.AD.02 - VLT
®
is a registered Danfoss trademark 85
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