Trane TR200 Series - Page 184

20-00 Feedback 1 Source
Option: Function:
Up to three different feedback signals can be used to provide the feed-
back signal for the frequency converter’s PID Controller.
This parameter defines which input will be used as the source of the first
feedback signal.
Analog input X30/11 and Analog input X30/12 refer to inputs on the op-
tional General Purpose I/O board.
[0] No function
[1] Analog input 53
[2] * Analog input 54
[3] Pulse input 29
[4] Pulse input 33
[7] Analog input X30/11
[8] Analog input X30/12
[9] Analog Input X42/1
[10] Analog Input X42/3
[11] Analog Input X42/5
[100] Bus feedback 1
[101] Bus feedback 2
[102] Bus feedback 3
NOTE: If a feedback is not used, its source must be set to
No Function [0]. par.20-20 Feedback Function determines
how the three possible feedbacks will be used by the PID Controller.
20-01 Feedback 1 Conversion
Option: Function:
This parameter allows a conversion function to be applied to Feedback
1.
[0] * Linear
Linear [0] has no effect on the feedback.
[1] Square root
Square root [1] is commonly used when a pressure sensor is used to pro-
vide flow feedback (
( flow ∝ pressure )
).
[2] Pressure to temperature
Pressure to temperature [2] is used in compressor applications to provide
temperature feedback using a pressure sensor. The temperature of the
refrigerant is calculated using the following formula:
Temperature =
A 2
(
ln
(
Pe +1
)
− A 1
)
−
A 3 , where A1, A2 and A3 are re-
frigerant-specific constants. The refrigerant must be selected in par.
20-30
Refrigerant. par.20-21 Setpoint 1 through par.20-23 Setpoint 3 al-
low the values of A1, A2 and A3 to be entered for a refrigerant that is not
listed in par.20-30
Refrigerant.
20-02 Feedback 1 Source Unit
Option: Function:
This parameter determines the unit that is used for this Feedback Source,
prior to applying the feedback conversion of par.20-01
Feedback 1 Con-
version. This unit is not used by the PID Controller.
[0] *
[1] %
[5] PPM
Parameter Description
TR200 Programming Guide 183