20-00 Feedback 1 Source
Option:
Function:
[9]
Analog Input X42/1
[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.
NOTICE!
If a feedback is not used, set its source to
[0] No
Function
.
Parameter 20-20 Feedback Function
determines
how the PID controller uses the three possible feedbacks.
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
parameter 20-30 Refrigerant
.
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
.
[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
20-01 Feedback 1 Conversion
Option:
Function:
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.
20-03 Feedback 2 Source
Option:
Function:
See
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
[15]
Analog Input X48/2
[100] Bus feedback 1
[101] Bus feedback 2
[102] Bus feedback 3
[104] Sensorless Flow
[105] Sensorless Pressure
20-04 Feedback 2 Conversion
Option:
Function:
See
for details.
[0]
*
Linear
[1]
Square root
[2]
Pressure to temperature
[3]
Pressure to flow
[4]
Velocity to flow
How to Program
VLT
®
HVAC Drive FC 102
100
Danfoss A/S © 08/2014 All rights reserved.
MG11F522
6
6
Содержание VLT HVAC Drive FC 102
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