20-20 Feedback Function
Option: Function:
This parameter determines how the three possible feedbacks will be used to control the output
frequency of the adjustable frequency drive.
[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 setpoint 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 setpoint 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 setpoint 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 refer-
ence.
[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 controller’s setpoint reference.
[5] Multi Setpoint Min
Multi-setpoint minimum
[5] sets up the PID Controller to calculate the difference between Feedback
1 and Setpoint 1, Feedback 2 and Setpoint 2, and Feedback 3 and Setpoint 3. It will use the feed-
back/setpoint pair in which the feedback is the farthest below its corresponding setpoint reference.
VLT
®
HVAC Drive Instruction Manual
7 How to Program the Adjustable Frequency
Drive
MG.11.AB.22 - VLT
®
is a registered Danfoss trademark
7-37
7
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