Danfoss VLT Micro Drive FC 51 Design Manual page 17

Safety and Conformity
As illustrated in Illustration 2.8, a frequency converter does
not consume more than rated current.
2 2
800
700
600
500
400
300
200
100
0
0
Illustration 2.8
2.5.9 Without a Frequency Converter
D.D.C.=Direct Digital Control
V.A.V.=Variable Air Volume
Sensor P=Pressure
Table 2.7 Fan System made in the Traditional Way
Cooling section
-
Flow
Return
3-Port
valve
Bypass
M
x6
Starter
P.F.C
Mains
Illustration 2.9
16
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VLT
4
3
2
1
12,5 25 37,5
Heating section
+
Return
Flow
Control
Control
3-Port
valve
Valve
Valve
posi-
posi-
tion
Bypass
tion
Pump Pump
M
x6
Starter
Fuses Fuses
LV LV
supply
supply
P.F.C
Mains
MG02K202 - VLT
®
Micro Drive FC 51 Design Guide
1 ®
VLT Micro Drive
2 Star/delta starter
3 Soft-starter
4 Start directly on mains
Table 2.6
2.5.8 Using a Frequency Converter Saves
Money
Example 2.5.9 Without a Frequency Converter 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, the
50Hz
two systems can be established at roughly the same price.
Full load
& speed
E.M.S.=Energy Management system
Sensor T=Temperature
Inlet guide vane Fan section
Fan
Mechanical
linkage
and vanes
IGV
Motor
or
actuator
Starter
Control
Mains
®
is a registered Danfoss trademark
Supply
air
M
Sensors
PT
x6
Duct
Local
D.D.C.
control
Pressure
control
Power
signal
Factor
0/10V
Correction
V.A.V
outlets
Main
B.M.S
Temperature
control
signal
0/10V