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 t
emper
atur
e
Supply t
emper
atur
e
O
ut
door t
emper
atur
e
Hea
ting C
oil
Cooling c
oil
Dampers or
Hea
t r
ec
ov
er
W
heel
Humidifier
D
uc
t P
ressur
e
Humidit
y sensor
Humidifier steps
or
Cooling steps
RELA
Y1
RELA
Y2
1 2 3
10 11 12
4 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
MG.11.CB.02 - VLT
®
is a registered Danfoss trademark
177
3
3