Danfoss VLT Instruction Manual page 102

Hvac drive
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6 How to program the adjustable frequency
drive
[8]
Analog input X30/12
[9]
Analog Input X42/1
[10]
Analog Input X42/3
[11]
Analog Input X42/5
[100]
Bus feedback 1
[101]
Bus feedback 2
[102]
Bus feedback 3
[104]
[105]
NOTE!
If a feedback is not used, its source must be set to
feedbacks will be used by the PID controller.
6
20-01 Feedback 1 Conversion
Option:
[0] *
Linear
[1]
Square root
[2]
Pressure to temperature
20-03 Feedback 2 Source
Option:
[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
[100]
Bus feedback 1
[101]
Bus feedback 2
[102]
Bus feedback 3
6-44
No Function
[0]. par.20-20
Function:
This parameter allows a conversion function to be applied to Feedback 1.
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
=
(
(
+ 1 ) −
1 )
ln
Pe
A
stants. The refrigerant must be selected in par. 20-30
par. 20-23
Setpoint 3
allow the values of A1, A2 and A3 to be entered for a refrigerant that is not
listed in par. 20-30
Refrigerant
.
Function:
See par.20-00
Feedback 1 Source
for details.
MG.11.A9.22 - VLT
®
is a registered Danfoss trademark
VLT
®
HVAC Drive Instruction Manual
Feedback Function
determines how the three possible
A
3 , where A1, A2 and A3 are refrigerant-specific con-
Refrigerant
. par.20-21
Setpoint 1
through

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