Danfoss ADAP-KOOL Drive Programming Manual page 146

3 Parameter Description
NB!
If a feedback is not used, its source must be set to
feedbacks will be used by the PID Controller.
20-01 Feedback 1 Conversion
This parameter allows a conversion function to be applied to Feedback 1.
3
Option:
[0] Linear
[1] Square root
[2] * Pressure to temperature
20-02 Feedback 1 Source Unit
This parameter determines the unit that is used for this Feedback Source, prior to applying the feedback conversion of
Conversion . This unit is not used by the PID Controller. It is used only for display and monitoring purposes.
Option:
[70] mbar
[71] * bar
[72] Pa
[73] kPa
[74] m WG
[170] psi
[171] lb/in 2
[172] in WG
[173] ft WG
NB!
This parameter is only available when using Pressure to Temperature Feedback Conversion.
146
No Function [0]. par.20-20
Function:
Linear
[0] has no effect on the feedback.
Square root [1] is commonly used when a pressure sensor is used to provide flow feedback
flow pressure
( ( ∝ ) ).
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 for-
mula:
A
2
Temperature
=
( ln ( Pe + 1 ) − A 1 )
stants. The refrigerant must be selected in parameter 20-30. Parameters 20-31 through 20-33 allow
the values of A1, A2 and A3 to be entered for a refrigerant that is not listed in parameter 20-30.
Function:
MG.11.N1.02 - VLT ® is a registered Danfoss trademark
®
ADAP-KOOL Drive Programming Guide
Feedback Function determines how the three possible
A
− 3 , where A1, A2 and A3 are refrigerant-specific con-
par. 20-01, Feedback 1