2.6.9 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
Illustration 2.9 Traditional Fan System
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
2.6.10 With a Frequency Converter
175HA206.11
Pump
Flow
Return
Supply
air
V.A.V
outlets
Duct
Mains
Pump
Return
Flow
Mains
Fan
Main
B.M.S
Local
D.D.C.
control
Sensors
Mains
Cooling section
Heating section
Fan section
Pressure
control
0-10V
or
0/4-20mA
Control
temperature
0-10V
or
0/4-20mA
Control
temperature
0-10V
or
0/4-20mA
VLT
M
-
+
VLT
M
M
PT
VLT
x3
x3
x3
Illustration 2.10 Fan System Controlled by Frequency
Converters
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
Product Overview
VLT
®
HVAC Basic Drive FC 101 Design Guide
16
MG18C502 - Rev. 2013-09-06
2
2
