Trane TR200 - Page 191

[11] Analog Input X42/5
[100] Bus feedback 1
[101] Bus feedback 2
[102] Bus feedback 3
[104] Sensorless Flow Requires set up by MCT10 with sensorless specific plug in.
[105] Sensorless Pressure Requires set up by MCT10 with sensorless specific plug in.
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 Ӗ 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
)
ì A 1
)
ì
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.
[3]
[4]
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
[10] min
[11] RPM
[12] PULSE/s
[20] liter / sec.
[21] liter / min
[22] liter / hr.
[23] m³ / sec.
[24] m³/min
[25] m³ / hr.
Parameter Description
4-154 TR200 Programming Guide