Danfoss VLT Instruction Manual page 104

6 How to program the adjustable frequency
drive
[1] Difference
[2] Average
[3] * Minimum
6
[4] Maximum
[5] Multi Setpoint Min
[6] Multi Setpoint Max
6-46
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.
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
Source , par.20-03 Feedback 2 Source
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.
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
Source
, par.20-03
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.
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
Source , par.20-03 Feedback 2 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.
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.
If all feedback signals are above their corresponding setpoints, the PID controller will use the feed-
back/setpoint pair in which the difference between the feedback and setpoint is the least.
NOTE!
If only two feedback signals are used, the feedback that is not to be used must
No Function
be set to
Source or par.20-06
be the sum of its respective parameter value (par.20-21
Setpoint 2
20-22 and par. 20-23
enabled (see par. group 3-1*).
Multi-setpoint maximum
[6] 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 farthest above its corresponding setpoint reference. If
all feedback signals are below their corresponding setpoints, the PID controller will use the feedback/
setpoint pair in which the difference between the feedback and the setpoint reference is the least.
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VLT ® HVAC Drive Instruction Manual
No Function in par.20-00
, or par.20-06 Feedback 3 Source
No Function in par.20-00
Feedback 2 Source Feedback 3 Source
, or par.20-06
No Function in par.20-00
, or par.20-06 Feedback 3 Source
Feedback 1 Source
in par.20-00
Feedback 3 Source . Note that each setpoint reference will
Setpoint 3
) and any other references that are
Feedback 1
. The sum
Feedback 1
. Only
Feedback 1
.
Feedback 2
, par.20-03
Setpoint 1
, par.