Trane TR150 - Main Menu - FC Closed Loop - Group

3.14 Main Menu - FC Closed Loop - Group
20
This parameter group is used for conguring the closed-
loop PI controller, that controls the output frequency of
the frequency converter.
3.14.1 20-0* Feedback
This parameter group is used to congure the feedback
signal for the closed-loop PI control of the frequency
converter.
20-00 Feedback 1 Source
Option: Function:
This parameter denes which input is
used as the source of the feedback
signal.
[0]
* No function
[1] Analog Input 53
[2] Analog Input 54
[3] Pulse input 29
[100] Bus Feedback 1
[101] Bus Feedback 2
20-01 Feedback 1 Conversion
Option: Function:
This parameter allows a conversion function to
be applied to feedback 1.
[0]
* Linear [0] Linear has no eect on the feedback.
[1] Square
root
[1] Square root is commonly used when a
pressure sensor is used to provide ow
feedback.
(
( flow ∝ pressure) ).
20-03 Feedback 2 Source
Option: Function:
[0] * No function
[1] Analog Input 53
[2] Analog Input 54
[3] Pulse input 29
[100] Bus Feedback 1
[101] Bus Feedback 2
20-04 Feedback 2 Conversion
Option: Function:
[0] * Linear
[1] Square root
3.14.2 20-2* Feedback/Setpoint
Parameter group for feedback function and setpoints.
Select which setpoint and feedback to use. The setpoint
and feedback can be a xed pair or selected separately
based on logic comparisons.
20-20 Feedback Function
Select how the feedback should be calculated. The feedback can
be either a single feedback source or a combination of several
feedbacks.
Option: Function:
[0] Sum
[1] Dierence
[2] Average
[3]
* Minimum
[4] Maximum
3.14.3 20-8* PI Basic Settings
Parameters for conguring the process PI control.
20-81 PI Normal/ Inverse Control
Option: Function:
[0] * Normal Causes the frequency converter output frequency
to decrease when the feedback is greater than the
setpoint reference. This behavior is common for
pressure-controlled supply fan and pump
applications.
[1] Inverse Causes the frequency converter output frequency
to increase when the feedback is greater than the
setpoint reference. This behavior is common for
temperature-controlled cooling applications, such
as cooling towers.
20-83 PI Start Speed [Hz]
Range: Function:
0 Hz * [ 0 -
200.0 Hz]
Enter the motor speed to be attained as a
start signal for commencement of PI control.
After power-up, the frequency converter
operates using speed open-loop control.
When the process PI start speed is reached,
the frequency converter changes to PI control.
20-84 On Reference Bandwidth
Range: Function:
5 % * [0 -
200 %]
When the dierence between the feedback and
the setpoint reference is less than the value of
this parameter, the frequency converter display
shows Run on Reference. This status can be
communicated externally by programming the
function of a digital output for [8] Run on
Reference/No Warning. In addition, for serial
communications, the on-reference status bit of
the frequency converter status word is high (1).
The on-reference bandwidth is calculated as a
percentage of the setpoint reference.
Parameters TR150 and TR170
84 02/2017 All rights reserved. BAS-SVP16B-EN
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