Technical information

3.24 Main Menu - Analog I/O Option MCB 109 - Group 26
The Analog I/O Option MCB 109 extends the functionality of VLT
®
HVAC Drive frequency converters, by adding a number of
additional, programmable analog inputs and outputs. This could be especially useful in Building Management System instal-
lations where the frequency converter may be used as de-central I/O, obviating the need for an outstation and thus
reducing cost.
Consider the diagram
130BA382.10
M
M
M
P T
T
T
H
Analog I/O Carsd Control Card Power card
Room temperature Supply temperature Outdoor temperature Heating Coil Cooling coil Dampers or Heat recover Wheel
Humidier Duct Pressure Humidity sensor
Humidier steps
or
Cooling steps
RELAY1 RELAY2
1 2 3 10 11 124 5 6 7 8 9 12 13 18 19 27 29 32 33 20 37 39 42 50 53 54 55 01 02 03 04 05 06
130BA381.10
X42
AIN AIN AIN AOUT AOUT AOUT 24VDC 24VDC DIN DIN DIN/DOUT DIN/DOUT DIN DIN AOUT AIN AIN
This shows a typical Air Handling Unit (AHU). As can be seen, the addition of the Analog I/O option offers the possibility to
control all of the functions from the frequency converter, such as inlet-, return- and exhaust dampers or heating/cooling
coils with temperature and pressure measurements being read by the frequency converter.
Parameter Description
VLT
®
HVAC Drive Programming Guide
184 MG11CD02 - VLT
®
is a registered Danfoss trademark
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