Operating instructions

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.
3.18.2 20-2* Feedback & Setpoint
This parameter group is used to determine how the frequency
converter’s PID Controller will use the three possible feedback
signals to control the output frequency of the frequency
converter. This group is also used to store the three internal
setpoint references.
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.
20-20 Feedback Function
Option: Function:
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.
[3]
*
Minimum Minimum [3] sets up the PID Controller to
compare Feedback 1, Feedback 2 and Feedback 3
and use the lowest value 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. 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 setpoint
reference.
[4] Maximum Maximum [4] sets up the PID Controller to
compare Feedback 1, Feedback 2 and Feedback 3
and use the highest value 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.
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 Control-
ler’s setpoint reference.
Parameter Description
VLT
®
HVAC Drive Programming Guide
124 MG.11.CA.02 - VLT
®
is a registered Danfoss trademark
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