Danfoss VLT FC51 Design Manual page 18

Safety and Conformity
2.7.9 Without a Frequency Converter
2 2
Cooling section
-
Return
3-Port
valve
Bypass
M
x6
Starter
P.F.C
Mains
D.D.C.
E.M.S.
V.A.V.
Sensor P
Sensor T
Table 2.6 Abbreviations used in Illustration 2.9
Illustration 2.9 Traditional Fan System
16
Heating section
+
Return
Flow Flow
Control
3-Port
valve
Valve
posi-
tion
Bypass
Pump Pump
M
x6
Starter
Fuses Fuses
LV
supply
P.F.C
Mains
Direct Digital Control
Energy Management system
Variable Air Volume
Pressure
Temperature
®
VLT Micro Drive FC 51 Design Guide
Inlet guide vane Fan section
Control
Mechanical
Valve
linkage
posi-
and vanes
tion
IGV
Motor
or
actuator
Control
LV
supply
MG02K302 - Rev. 2013-12-03
Supply
air
Fan
M
Sensors
PT
x6
Local
D.D.C.
control
Starter
Pressure
control
Power
signal
Factor
0/10V
Correction
Mains
V.A.V
outlets
Duct
Main
B.M.S
Temperature
control
signal
0/10V