Danfoss VLT FC51 Design Manual page 19

Safety and Conformity
2.7.10 With a Frequency Converter
Cooling section Heating section Fan section
Fan
M
- +
Return Flow Return Flow
Pump Pump
M
M
x3 x3
VLT VLT VLT
Control
Control
temperature
temperature
0-10V
0-10V
or
or
0/4-20mA
0/4-20mA
Mains Mains
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
Table 2.7 Abbreviations used in Illustration 2.10
Illustration 2.10 Fan System Controlled by Frequency
Converters
®
VLT Micro Drive FC 51 Design Guide
Supply
air
V.A.V
Sensors
outlets
PT
x3
Duct
Local
Main
D.D.C.
B.M.S
Pressure control
control
0-10V
or
0/4-20mA
MG02K302 - Rev. 2013-12-03
2 2
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