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: 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
choices [0] through [6], select
User defined
[7]. Then, use par. 20-31
User Defined Refrigerant
A1
, par. 20-32
User Defined Refrigerant A2
and par. 20-33
User Defined Refrigerant A3
to provide
A1, A2 and A3 for the equation below:
Temperature
=
A
2
(
ln
(
Pe
+1
)
−
A
1
)
−
A
3
[0] * R22
[1] R134a
[2] R404A
[3] R407C
[4] R410A
[5] R502
[6] R744
[7] User defined
20-31 User Defined Refrigerant A1
Range: Function:
10.0000 N/
A*
[8.0000 - 12.0000 N/A] Use this parameter to enter the value of coefficient A1 when par. 20-30
Refrigerant
is set to
User
defined
[7].
20-32 User Defined Refrigerant A2
Range: Function:
-2250.00 N/
A*
[-3000.00 - -1500.00 N/A] Use this parameter to enter the value of coefficient A2 when par. 20-30
Refrigerant
is set to
User
defined
[7].
20-33 User Defined Refrigerant A3
Range: Function:
250.000 N/
A*
[200.000 - 300.000 N/A] Use this parameter to enter the value of coefficient A3 when par. 20-30
Refrigerant
is set to
User
defined
[7].
20-34 Fan 1 Area [m2]
Range: Function:
0.500 m2* [0.000 - 10.000 m2]
20-35 Fan 1 Area [in2]
Range: Function:
750 in2* [0 - 15000 in2]
20-36 Fan 2 Area [m2]
Range: Function:
0.500 m2* [0.000 - 10.000 m2]
20-37 Fan 2 Area [in2]
Range: Function:
750 in2* [0 - 15000 in2]
VLT
®
HVAC Drive Programming Guide 3 Parameter Description
MG.11.C9.02 - VLT
®
is a registered Danfoss trademark
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