Danfoss VLT FC 100, Operating Instructions Manual, Page: 125 / 193

20-07 Feedback 3 Conversion
Option: Function:
See par. 20-01 Feedback 1 Conversion for details.
[0] * Linear
[1] Square root
[2] Pressure to temperature
[3] Pressure to flow
[4] Velocity to flow
20-20 Feedback Function
Option: Function:
This meter determines how the three possible feedbacks will be used to control the output fre-
quency 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.
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 meter 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 meter 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 Feed-
back 3 as the feedback.
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 meter group
3-1*) will be used as the PID Controller’s set-point reference.
[3] * Minimum Minimum [3] sets up the PID Controller to com Feedback 1, Feedback 2 and Feedback 3 and use
the lowest value as the feedback.
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 meter group 3-1*) will be used as the PID Controller’s set-
point reference.
[4] Maximum Maximum [4] sets up the PID Controller to com Feedback 1, Feedback 2 and Feedback 3 and use
the highest value as the feedback.
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 meter 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 Feed-
back 1 and Setpoint 1, Feedback 2 and Setpoint 2, and Feedback 3 and Setpoint 3. It will use the
6 How to Programme
VLT HVAC Drive High Power Operating In-
structions
124
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