Feedback Adv. Conversion; Refrigerant; User Defined Refrigerant A1 - Danfoss VLT Programming Manual

®
VLT HVAC Drive Programming Guide

3.18.4 20-3* Feedback Adv. Conversion

In air conditioning compressor applications it is often useful to control the system based on the temperature of the refrigerant. However, it is generally
more convenient to directly measure its pressure. This parameter group allows the frequency converter's PID Controller to convert refrigerant pressure
measurements into temperature values.

20-30 Refrigerant

Option:
[0] * R22
[1] R134a
[2] R404A
[3] R407C
[4] R410A
[5] R502
[6] R744
[7] User defined

20-31 User Defined Refrigerant A1

Range:
10.0000 N/ [8.0000 - 12.0000 N/A]
A*
20-32 User Defined Refrigerant A2
Range:
-2250.00 N/ [-3000.00 - -1500.00 N/A]
A*
20-33 User Defined Refrigerant A3
Range:
250.000 N/ [200.000 - 300.000 N/A]
A*
20-34 Fan 1 Area [m2]
Range:
0.500 m2* [0.000 - 10.000 m2]
20-35 Fan 1 Area [in2]
Range:
750 in2* [0 - 15000 in2]
20-36 Fan 2 Area [m2]
Range:
0.500 m2* [0.000 - 10.000 m2]
20-37 Fan 2 Area [in2]
Range:
750 in2* [0 - 15000 in2]
Function:
Select the refrigerant used in the compressor application. This parameter must be specified correctly
for the pressure to temperature conversion to be accurate. If the refrigerant used is not listed in
User defined
choices [0] through [6], select
A1 User Defined Refrigerant A2
, par. 20-32
A1, A2 and A3 for the equation below:
A 2
Temperature
=
( ln ( Pe + 1 ) −
Function:
Use this parameter to enter the value of coefficient A1 when par. 20-30
defined
[7].
Function:
Use this parameter to enter the value of coefficient A2 when par. 20-30
defined
[7].
Function:
Use this parameter to enter the value of coefficient A3 when par. 20-30
defined
[7].
Function:
Function:
Function:
Function:
MG.11.C9.02 - VLT ® is a registered Danfoss trademark
[7]. Then, use par. 20-31
User Defined Refrigerant A3
and par. 20-33
A
− 3
A 1 )
3 Parameter Description
3
User Defined Refrigerant
to provide
Refrigerant User
is set to
Refrigerant User
is set to
Refrigerant User
is set to
183