Danfoss FC 101 Design Manual page 18

Product Overview
2.6.9 Without a Frequency Converter
2 2
Cooling section
-
Return
3-Port
valve
Bypass
M
x6
Starter
P.F.C
Mains
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 Illustration 2.9
2.6.10 With a Frequency Converter
Cooling section
-
Return Flow Return
Pump
M
x3
VLT
Control
temperature
0-10V
or
0/4-20mA
Mains
Illustration 2.10 Fan System Controlled by Frequency
Converters
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
Heating section
Fan section
Fan
+ M
Flow
x3
Pump
M
x3
VLT VLT
Pressure
control
0-10V
or
0/4-20mA
Control
temperature
0-10V
or
0/4-20mA
Mains
Mains
®
VLT HVAC Basic Drive FC 101 Design Guide
Inlet guide vane Fan section
Control
Mechanical
Valve
linkage
posi-
and vanes
tion
IGV
Motor
or
actuator
Control
LV
supply
D.D.C.
E.M.S.
V.A.V.
Sensor P
Sensor T
Table 2.7 Abbreviations used in Illustration 2.10
Supply
air
V.A.V
Sensors
outlets
PT
Duct
Local
Main
D.D.C.
B.M.S
control
MG18C502 - Rev. 2013-09-06
Supply
air
Fan
M
Sensors
PT
x6
Local
D.D.C.
control
Starter
Pressure
control
Power
signal
Factor
0/10V
Correction
Mains
Direct Digital Control
Energy Management system
Variable Air Volume
Pressure
Temperature
V.A.V
outlets
Duct
Main
B.M.S
Temperature
control
signal
0/10V