Danfoss VLT FC 102 Programming Manual page 443

Programming Guide | VLT® HVAC Drive FC 102
Option Name
[2] Pressure to temperature
[3] Pressure to flow
[4] Velocity to flow
20-05 Feedback 2 Source Unit
Default value: –
Setup:
All setups
Data type: Uint8
This parameter is only available when using pressure to temperature feedback conversion. If option [0] Linear is selected in
parameter 20-04 Feedback 2 Conversion, the setting of any option in parameter 20-05 Feedback 2 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 20-04
Feedback 2 Conversion. This unit is not used by the PID controller.
Option Name
[0] None
[1] %
[5] PPM
[10] 1/min
© 2024.10
Description
Used in compressor applications to provide temperature
feedback using a pressure sensor. The temperature of the
refrigerant is calculated using the following formula:
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.
Used in applications for controlling the air flow in a duct. A
dynamic pressure measurement (pitot tube) represents the
feedback signal.
See also parameter 20-34 Duct 1 Area [m2]through parameter
20-38 Air Density Factor [%] for setting of duct area and air
density.
Used in applications for controlling the air flow in a duct. An air
velocity measurement represents the feedback signal.
Flow = Duct area x air velocity
See also parameter 20-34 Duct 1 Area [m2]through parameter
20-37 Duct 2 Area [in2] for setting of duct area.
Parameter type:
Conversion index:
Change during operation:
NOTICE
Description
Parameter Descriptions
Option
–
True
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