20-35 Duct 1 Area [in2]
Range:
Function:
the setting of
parameter 0-03 Regional Settings
.
Fan 1 is used with feedback 1. In case of flow
difference control, set
to
[1] Difference
, if flow fan 1 – flow
fan 2 is to be controlled.
20-36 Duct 2 Area [m2]
Range:
Function:
0.500
m2
*
[0.001
- 10 m2]
Used for setting the area of the air ducts in
connection with feedback conversion
pressure/velocity to flow. The unit (m
2
) is
determined by the setting of
parameter 0-03 Regional Settings
. Fan 2 is used
with feedback 2. In case of flow difference
control, set
parameter 20-20 Feedback Function
to
[1] Difference
, if flow fan 1 – flow fan 2 is to
be controlled.
20-37 Duct 2 Area [in2]
Range:
Function:
750
in2
*
[1 -
15500
in2]
Used for setting the area of the air ducts in
connection with feedback conversion pressure/
velocity to flow. The unit (in
2
) is determined by
the setting of
parameter 0-03 Regional Settings
.
Fan 2 is used with feedback 2. In case of flow
difference control, set
to
[1] Difference
, if flow fan 1 – flow
fan 2 is to be controlled.
20-38 Air Density Factor [%]
Range:
Function:
100 %
*
[50 - 150
%]
Set the air density factor for conversion
from pressure to flow in % relative to the
air density at sea level at 20
°
C (100% ~
1,2 kg/m
3
).
3.18.4 20-6* Sensorless
Parameters for Sensorless. See also
•
Parameter 20-00 Feedback 1 Source
•
Parameter 18-50 Sensorless Readout [unit]
•
Parameter 16-26 Power Filtered [kW]
•
Parameter 16-27 Power Filtered [hp]
NOTICE
Sensorless unit and sensorless information require set-up
by MCT 10 Set-up Software with sensorless specific plug
in.
20-60 Sensorless Unit
Option:
Function:
Select the unit to be used with
parameter 18-50 Sensorless Readout [unit]
.
[20]
l/s
[21]
l/min
[22]
l/h
[23]
m³/s
[24]
m³/min
[25]
m³/h
[70]
mbar
[71]
bar
[72]
Pa
[73]
kPa
[74]
m WG
[75]
mm Hg
[120] GPM
[121] gal/s
[122] gal/min
[123] gal/h
[124] CFM
[125] ft³/s
[126] ft³/min
[127] ft³/h
[170] psi
[171] lb/in²
[172] in WG
[173] ft WG
[174] in Hg
20-69 Sensorless Information
Range:
Function:
0
*
[0 - 25 ]
View information about the sensorless data.
3.18.5 20-7* PID Auto Tuning
The frequency converter PID closed-loop controller
(parameter group
20-**, FC Drive Closed Loop
) can be auto-
tuned, simplifying and saving time during commissioning,
while ensuring accurate PID control adjustment. To use
auto-tuning, configure for the frequency converter for
closed loop in
parameter 1-00 Configuration Mode
.
Use a graphical local control panel (GLCP) to react to
messages during the auto-tuning sequence.
Enabling
parameter 20-79 PID Autotuning
puts the
frequency converter into auto-tuning mode. The LCP then
on-screen instructions.
To start the fan/pump, press [Auto On] and apply a start
signal. Adjust the speed manually by pressing [
▲
] or [
▼
] to
a level where the feedback is around the system set-point.
Parameter Descriptions
Programming Guide
MG11CE02
Danfoss A/S © 03/2015 All rights reserved.
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