Danfoss VLT FC 100 Series Programming Guide

NB!
If a feedback is not used, its source must be set to
No Function [0]. Parameter 20-10 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 provide flow feedback
(
(
flow ∝ pressure
)
).
[2] Pressure to tempera-
ture
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 refrigerant-specific constants. The
refrigerant must be selected in parameter 20-30. Parameters 20-21 through 20-23 allow the values of A1, A2
and A3 to be entered for a refrigerant that is not listed in parameter 20-30.
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 con-
version of
par. 20-01, Feedback 1 Conversion . This unit is not used by the PID Controller. It is used only for
display and monitoring purposes.
[0] None
[1]
*
%
[5] PPM
[10] 1/min
[11] RPM
[12] Pulse/s
[20] l/s
[21] l/min
[22] l/h
[23]
m
3
/s
[24]
m
3
/min
[25]
m
3
/h
[30] kg/s
[31] kg/min
[32] kg/h
[33] t/min
[34] t/h
[40] m/s
[41] m/min
[45] m
[60] °C
[70] mbar
[71] bar
[72] Pa
3. Parameter Description VLT
®
HVAC Drive Programming Guide
154 MG.11.C5.02 - VLT
®
is a registered Danfoss trademark
3

Danfoss VLT FC 100 Series Specifications

General

Brand	Danfoss
Model	VLT FC 100 Series
Category	DC Drives
Language	English