![background image](http://html1.mh-extra.com/html/danfoss/vlt/vlt_instruction-manual_3503171102.webp)
[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
No Function
[0]. par.20-20
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 temperature
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:
Temperature
=
A
2
(
ln
(
Pe
+ 1)
−
A
1)
−
A
3
, where A1, A2 and A3 are refrigerant-specific con-
stants. The refrigerant must be selected in par. 20-30
Refrigerant
through
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
.
20-03 Feedback 2 Source
Option:
Function:
See par.20-00
for details.
[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 How to program the adjustable frequency
drive
VLT
®
HVAC Drive Instruction Manual
6-44
MG.11.A9.22 - VLT
®
is a registered Danfoss trademark
6
Содержание VLT
Страница 8: ...1 Safety VLT HVAC Drive Instruction Manual 1 6 MG 11 A9 22 VLT is a registered Danfoss trademark 1...
Страница 152: ...7 Troubleshooting VLT HVAC Drive Instruction Manual 7 8 MG 11 A9 22 VLT is a registered Danfoss trademark 7...
Страница 174: ...8 Specifications VLT HVAC Drive Instruction Manual 8 22 MG 11 A9 22 VLT is a registered Danfoss trademark 8...