Danfoss vlt FC 102 Programming Guide

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 dierent feedback signals
can be used to provide the
feedback signal for the frequency
converter’s PID controller.
This parameter denes which input
is used as the source of the rst
feedback signal.
Analog input X30/11 and analog
input X30/12 refer to inputs on
VLT
®
General Purpose I/O MCB 101.
[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
20-00 Feedback 1 Source
Option: Function:
[104] Sensorless
Flow
Requires set-up by MCT 10 Set-up
Software with sensorless plug-in.
[105] Sensorless
Pressure
Requires set-up by MCT 10 Set-up
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 eect on the feedback.
[1] Square root Commonly used when a pressure
sensor is used to provide ow
feedback
(( flow ∝ pressure)).
[2] Pressure to
temperature
Used in compressor applications to
provide temperature feedback using
a pressure sensor. The temperature
of the refrigerant is calculated using
the following formula:
Temperature = 
A2
ln Pe + 1 − A1
− A3,
where A1, A2, and A3 are
refrigerant-specic 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
ow
Used in applications for controlling
the air ow 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
ow
Used in applications for controlling
the air ow 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.
Parameter Descriptions Programming Guide
M0010001 Danfoss A/S © 10/2019 All rights reserved. 175
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Danfoss vlt FC 102 Specifications

General

Brand	Danfoss
Model	vlt FC 102
Category	DC Drives
Language	English