Danfoss VLT FC 102 Programming Manual page 177

Parameter Descriptions
20-00 Feedback 1 Source
Option: Function:
NOTICE
If feedback is not used, set its
source to [0] No Function.
Parameter 20-20 Feedback
Function determines how the
PID controller uses the 3
possible feedbacks.
Up to 3 different feedback signals
can be used to provide the
feedback signal for the frequency
converter's PID controller.
This parameter defines which input
is used as the source of the first
feedback signal.
Analog input X30/11 and analog
input X30/12 refer to inputs on
VLT
[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
[15] Analog Input
X48/2
[16] Analog Input
X49/1
[17] Analog Input
X49/3
[18] Analog Input
X49/5
[19] Pressure 3
[20] Pressure 4
[99] Normal
Feedback
[100] Bus Feedback
1
[101] Bus Feedback
2
[102] Bus feedback
3
M0010001
Programming Guide
®
General Purpose I/O MCB 101.
Danfoss A/S © 10/2019 All rights reserved.
20-00 Feedback 1 Source
Option: Function:
[104] Sensorless Requires set-up by MCT 10 Set-up
Flow Software with sensorless plug-in.
[105] Sensorless Requires set-up by MCT 10 Set-up
Pressure Software with sensorless plug-in.
[110] Air Pres. to
Flow
20-01 Feedback 1 Conversion
Option: Function:
This parameter allows a conversion
function to be applied to feedback
1.
[0] Linear No effect on the feedback.
*
[1] Square root Commonly used when a pressure
sensor is used to provide flow
feedback
(
( flow ∝ pressure)
[2] Pressure to Used in compressor applications to
temperature provide temperature feedback using
a pressure sensor. The temperature
of the refrigerant is calculated using
the following formula:
Temperature =
where A1, A2, and A3 are
refrigerant-specific constants. Select
the refrigerant in
parameter 20-30 Refrigerant.
Parameter 20-21 Setpoint 1 through
parameter 20-23 Setpoint 3 allow the
values of A1, A2, and A3 to be
entered for a refrigerant that is not
listed in parameter 20-30 Refrigerant.
[3] Pressure to Used in applications for controlling
flow the air flow in a duct. A dynamic
pressure measurement (pitot tube)
represents the feedback signal.
Flow = Duct Area × Dynamic Pressure
× Air Density Factor
See also parameter 20-34 Duct 1
Area [m2] through
parameter 20-38 Air Density Factor
[%] for setting of duct area and air
density.
[4] Velocity to Used in applications for controlling
flow the air flow in a duct. An air
velocity measurement represents
the feedback signal.
Flow = Duct Area × Air Velocity
See also parameter 20-34 Duct 1
Area [m2] through
parameter 20-37 Duct 2 Area [in2]
for setting of duct area.
3
).
A2
,
− A3
ln Pe + 1 − A1
175
3