20-00 Feedback 1 Source
Option:
Function:
[10]
Analog Input
X42/3
[11]
Analog Input
X42/5
[15]
Analog Input
X48/2
[100] Bus Feedback 1
[101] Bus Feedback 2
[102] Bus feedback 3
[104] Sensorless Flow Requires set-up by MCT 10 Set-up
Software with sensorless-specific plug-in.
[105] Sensorless
Pressure
Requires set-up by MCT 10 Set-up
Software with sensorless-specific plug-in.
20-01 Feedback 1 Conversion
Option:
Function:
This parameter allows a conversion function
to be applied to feedback 1.
[0]
*
Linear
No effect on the feedback.
[1] Square root
Commonly used when a pressure sensor is
used to provide flow feedback
(
( flow ∝ pressure)
).
[2] Pressure to
temperature
Used in compressor applications to provide
temperature feedback using a pressure
sensor. The temperature of the refrigerant is
calculated using the following formula:
Temperature =
A2
ln Pe + 1 − A1 − A3
,
where A1, A2 and A3 are refrigerant-specific
constants. Select the refrigerant in
.
through
allow the values of
A1, A2 and A3 to be entered for a refrigerant
that is not listed in
.
[3] Pressure to
flow
Used in applications for controlling the air
flow in a duct. A dynamic pressure
measurement (pitot tube) represents the
feedback signal.
Flow = Duct Area × Dynamic Pressure
× Air Density Factor
See also
parameter 20-34 Duct 1 Area [m2]
through
parameter 20-38 Air Density Factor [%]
for setting of duct area and air density.
[4] Velocity to
flow
Used in applications for controlling the air
flow in a duct. An air velocity measurement
represents the feedback signal.
Flow = Duct Area × Air Velocity
See also
parameter 20-34 Duct 1 Area [m2]
through
parameter 20-37 Duct 2 Area [in2]
for
setting of duct area.
20-02 Feedback 1 Source Unit
Option:
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
. This unit is not used by the PID
controller.
[0]
None
[1]
%
[5]
PPM
[10]
1/min
[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
[75]
mm Hg
[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
Parameter Descriptions
VLT
®
HVAC Drive FC 102
140
Danfoss A/S © 03/2015 All rights reserved.
MG11CE02
3
3