2.7.9 Without a Frequency Converter
M
-
+
M
M
x6
x6
x6
175HA205.12
Valve
posi-
tion
Starter
Fuses
LV
supply
P.F.C
Flow
3-Port
valve
Bypass
Return
Control
Supply
air
V.A.V
outlets
Duct
P.F.C
Mains
Fuses
Starter
Bypass
supply
LV
Return
valve
3-Port
Flow
Control
Valve
posi-
tion
Starter
Power
Factor
Correction
Mains
IGV
Mechanical
linkage
and vanes
Fan
Motor
or
actuator
Main
B.M.S
Local
D.D.C.
control
Sensors
PT
Pressure
control
signal
0/10V
Temperature
control
signal
0/10V
Control
Mains
Cooling section
Heating section
Fan section
Inlet guide vane
Pump
Pump
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 2.6 Abbreviations used in
Illustration 2.9 Traditional Fan System
Safety and Conformity
VLT
®
Micro Drive FC 51 Design Guide
16
MG02K302 - Rev. 2013-12-03
2
2