Danfoss VLT Series Programming Manual page 136

Parameter Description
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
determined by the setting of 0-03 Regional
Settings. Fan 2 is used with feedback 2. In
case of flow difference control, set
20-20 Feedback Function to [1] Difference, if
flow fan 1 – flow fan 2 is to be controlled.
0.500 [0.000 -
m2 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
determined by the setting of 0-03 Regional
Settings. Fan 2 is used with feedback 2. In
case of flow difference control, set
20-20 Feedback Function to [1] Difference, if
flow fan 1 – flow fan 2 is to be controlled.
750 [0 -
in2 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
3.18.4 20-6* Sensorless
meters for Sensorless. See also 20-00 Feedback 1 Source,
18-50 Sensorless Readout [unit], 16-26 Power Filtered [kW]
and 16-27 Power Filtered [hp].
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 18-50 Sensorless
Readout [unit].
[20] l/s
[21] l/min
[22] l/h
[23] m³/s
[24] m³/min
®
VLT HVAC Drive Programming Guide
2
) is
2 ) is
3 ).
®
MG.11.CC.02 - VLT is a registered Danfoss trademark
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 1-00 Configuration Mode.
A Graphical Local Control Panel (LCP) must be used in
order to react on messages during the auto-tuning
sequence.
Enabling 20-79 PID Autotuning, 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 [
LCP to a level where the feedback is around the system
set-point.
▼
] navigation keys on the
135
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