Danfoss VLT HVAC Basic Drive FC 100 Series Design Manual page 15

Introduction to VLT HVAC Ba...
1 = VLT HVAC Basic Drive
2 = Star/delta starter
2 2
3 = Soft-starter
4 = Start directly on mains
2.5.8 Using a Frequency Converter Saves
Money
The example on the following page shows that a lot of
equipment is not required when a frequency converter is
used. It is possible to calculate the cost of installing the
two different systems. In the example on the following
page, the two systems can be established at roughly the
same price.
2.5.9 Without a Frequency Converter
D.D.C. =
V.A.V. = Variable Air Volume
Sensor P = Pressure
Table 2.1 Fan System made in the Traditional Way
Cooling section
-
Flow
Return
3-Port
valve
Bypass
M
x6
Starter
P.F.C
Mains
14
Energy
Direct Digital
E.M.S. = Management
Control
system
Sensor
= Temperature
T
Heating section
+
Return
Flow
Control
3-Port
valve
Valve
posi-
tion Bypass
Pump Pump
M
x6
Starter
Fuses Fuses
LV
supply
P.F.C
Mains
MG.18.C2.02 - VLT
VLT HVAC Basic Drive Design Guide
Inlet guide vane Fan section
Control
Mechanical
Valve
linkage
posi-
and vanes
tion
IGV
Motor
or
actuator
Control
LV
supply
®
is a registered Danfoss trademark
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