20-36 Fan 2 Area [m2]
Range:
Function:
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
. 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.
0.500
m2
*
[0.000 -
10.000
m2]
20-37 Fan 2 Area [in2]
Range:
Function:
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
. 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.
750
in2
*
[0 -
15000 in2]
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
meters for Sensorless. See also
,
18-50 Sensorless Readout [unit]
and
NOTE
Sensorless unit and Sensorless Information requires 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
.
[20]
l/s
[21]
l/min
[22]
l/h
[23]
m³/s
[24]
m³/min
20-60 Sensorless Unit
Option:
Function:
[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 - 0 ]
View information about the sensor-less data.
3.18.5 20-7* PID autotuning
The frequency converter PID Closed Loop controller
(meters 20-**, FCDrive Closed Loop) can be auto-tuned,
simplifying and saving time during commissioning, whilst
ensuring accurate PID control adjustment. To use auto-
tuning it is necessary for the frequency converter to be
configured for closed loop in
.
A Graphical Local Control Panel (LCP) must be used in
order to react on messages during the auto-tuning
sequence.
Enabling
, puts the frequency
converter into auto-tuning mode. The LCP then directs the
user with on-screen instructions.
The fan/pump is started by pressing [Auto On] button on
the LCP and applying a start signal. The speed is adjusted
manually by pressing the [
▲
] or [
▼
] navigation keys on the
LCP to a level where the feedback is around the system
set-point.
Parameter Description
VLT
®
HVAC Drive Programming Guide
MG.11.CC.02 - VLT
®
is a registered Danfoss trademark
135
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