NOTE
If
a feedback is not used, its source must be set to [0] No
Function. 20-20 Feedback Function determines how the
three possible 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.
Option: Function:
[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 formula:
Temperature
=
A
2
(
ln
(
Pe
+ 1
)
−
A
1
)
−
A
3 , where
A1, A2 and A3 are refrigerant-specific
constants. The refrigerant must be selected
in 20-30 Refrigerant. 20-31 User Defined
Refrigerant A1 through 20-33 User Defined
Refrigerant A3 allow the values of A1, A2
and A3 to be entered for a refrigerant that
is not listed in 20-30 Refrigerant.
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
20-01 Feedback 1 Conversion. This unit is not used by the PID
Controller. It is used only for display and monitoring purposes.
Option: Function:
[70] mbar
[71] * bar
[72] Pa
[73] kPa
[74] m WG
[170] psi
[171]
lb/in
2
[172] in WG
[173] ft WG
NOTE
This
parameter is only available when using Pressure to
Temperature Feedback Conversion.
20-03 Feedback 2 Source
Option: Function:
See 20-00 Feedback 1 Source
for
details.
[0] * No function
[1] Analog Input 53
20-03 Feedback 2 Source
Option: Function:
[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
20-04 Feedback 2 Conversion
Option: Function:
See 20-01 Feedback 1 Conversion
for
details.
[0] * Linear
[1] Square root
[2] Pressure to temperature
20-05 Feedback 2 Source Unit
Option: Function:
See 20-02
Feedback 1 Source Unit
for details.
20-06 Feedback 3 Source
Option: Function:
See 20-00 Feedback 1 Source
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
20-07 Feedback 3 Conversion
Option: Function:
See 20-01 Feedback 1 Conversion
for details.
[0] * Linear
[1] Square root
[2] Pressure to temperature
Parameter Description
VLT
®
Refrigeration Drive Programming Guide
MG16H102 - VLT
®
is a registered Danfoss trademark
113
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