Danfoss VLT Refrigeration Drive FC 103 Programming Manual page 130

Parameter Description
20-00 Feedback 1 Source
Option:
[10] Analog Input
X42/3
[11] Analog Input
3 3
X42/5
[100] Bus Feedback 1
[101] Bus Feedback 2
[102] Bus feedback 3
[110] Air Pres. to Flow
20-01 Feedback 1 Conversion
Option:
[0] Linear
[1] Square root
[2] Pressure to
temperature
*
20-02 Feedback 1 Source Unit
Option:
[0]
[1] %
[5] PPM
[10] 1/min
128
VLT
Function:
Function:
This parameter allows a conversion function
to be applied to feedback 1.
No effect on the feedback.
Commonly used when a pressure sensor is
used to provide flow feedback
( ).
( flow ∝ pressure)
Used in compressor applications to provide
temperature feedback using a pressure
sensor. The temperature of the refrigerant is
calculated using the following formula:
A2
Temperature = − A3
ln Pe + 1 − A1
where A1, A2 and A3 are refrigerant-specific
constants. Select the refrigerant in
parameter 20-30 Refrigerant.
Parameter 20-21 Setpoint 1 through
parameter 20-23 Setpoint 3 allow the values
of A1, A2, and A3 to be entered for a
refrigerant that is not listed in
parameter 20-30 Refrigerant.
Function:
NOTICE
This parameter is only available when
using pressure to temperature feedback
conversion.
If option [0] Linear is selected in
parameter 20-01 Feedback 1 Conversion, the
setting of any option in
parameter 20-02 Feedback 1 Source Unit
does not matter as a conversion is 1-to-1.
This parameter determines the unit that is used
for this feedback source, before applying the
feedback conversion of parameter 20-01 Feedback
1 Conversion. This unit is not used by the PID
controller.
Danfoss A/S © 05/2016 All rights reserved.
®
Refrigeration Drive FC 103
20-02 Feedback 1 Source Unit
Option:
[11] RPM
[12] Pulse/s
[20] l/s
[21] l/min
[22] l/h
[23] m³/s
[24] m³/min
[25] m³/h
[30] kg/s
[31] kg/min
[32] kg/h
[33] t/min
[34] t/h
[40] m/s
[41] m/min
[45] m
[60] °C
[70] mbar
[71] bar
[72] Pa
[73] kPa
[74] m WG
,
[80] kW
[120] GPM
[121] gal/s
[122] gal/min
[123] gal/h
[124] CFM
[125] ft³/s
[126] ft³/min
[127] ft³/h
[130] lb/s
[131] lb/min
[132] lb/h
[140] ft/s
[141] ft/min
[145] ft
[160] °F
[170] psi
[171] lb/in²
[172] in WG
[173] ft WG
[180] HP
20-03 Feedback 2 Source
Option:
[0] No function
*
[1] Analog Input 53
[2] Analog Input 54
[3] Pulse input 29
Function:
Function:
See parameter 20-00 Feedback 1
Source for details.
MG16H202