Trane TR200 Programming Manual page 197

Parameter Description
NOTE: If operating with par.1-00
be used.
20-2* Feedback & Setpoint
This parameter group is used to determine how the adjustable frequency drive's PID controller will use the three
possible feedback signals to control the output frequency of the adjustable frequency drive. This group is also
used to store the three internal setpoint references.
20-20 Feedback Function
Option:
[0] Sum
[1] Difference
[2] Average
[3] * Minimum
[4] Maximum
4-160
Configuration Mode set for Open-loop [0], par.3-03
Function:
This parameter determines how the three possible feedbacks will be
used to control the output frequency of the adjustable frequency drive.
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
20-00 Feedback 1 Source, par.20-03
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.
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
20-00 Feedback 1 Source, par.20-03
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.
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
20-00 Feedback 1 Source, par.20-03
20-06 Feedback 3 Source. Only setpoint 1 will be used. The sum of Set-
point 1 and any other references that are enabled (see par. group 3-1*)
will be used as the PID controller's setpoint reference.
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
20-00 Feedback 1 Source, par.20-03
20-06 Feedback 3 Source.
Only Setpoint 1 will be used. The sum of Setpoint 1 and any other refer-
ences that are enabled (see par. group 3-1*) will be used as the PID
controller's setpoint reference.
Maximum Reference
No Function
in par.
Feedback 2 Source, or par.
No Function
in par.
Feedback 2 Source, or par.
No Function
in par.
Feedback 2 Source, or par.
No Function
in par.
Feedback 2 Source, or par.
TR200 Programming Guide
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