Trane TR200 Series - Page 190

20-14 Maximum Reference/Feedb.
Range: Function:
100.000
Proc-
essCtrlU-
nit*
[par. 20-13 - 999999.999
ProcessCtrlUnit]
Enter the maximum reference/feedback for closed loop operation. The
setting determines the highest value obtainable by summing all refer-
ence 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.
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.
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 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.
[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.
Parameter Description
TR200 Programming Guide 189