Danfoss VLT Micro Drive FC 51 Design Manual page 19

Safety and Conformity
2.8.10 With a Frequency Converter
Cooling section
-
Return Flow Return
Pump
M
x3
VLT
Control
temperature
0-10V
or
0/4-20mA
Mains
D.D.C. Direct digital control
E.M.S. Energy management system
V.A.V. Variable air volume
Sensor P Pressure
Sensor T Temperature
Illustration 2.10 Fan System Controlled by Frequency Converters
MG02K402
Design Guide
Heating section Fan section
Fan
+
M
Flow
Pump
M
x3
VLT VLT
Control
temperature
0-10V
or
0/4-20mA
Mains
Mains
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x3
Pressure
control
0-10V
or
0/4-20mA
Supply
air
V.A.V
Sensors
outlets
T
P
Duct
Local
Main
D.D.C.
B.M.S
control
2 2
17