1. DrivesDrives

2.  An AC drive changes the speed of a
motor by changing the speed of the
rotating magnetic field in a motor that
turns the motor shaft.

3. NS

4. s
N ss
ss
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6
s

5. s
N
ss
ss
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s

6. s
N
ss
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7. s
N
ss
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8. s
N
ss
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9. s
N
ss
ss
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10. s
N ss
ss
1
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4
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6
s

11. AC
Line
Input
Diode
Bridge
Converter
DC
Bus
Link
Transistor
Inverter
AC
Output
_
+

15. Why do people use drives?
 68% of all electrical energy is used by
centrifugal pumps and fans.
 VFDs can run centrifugal pumps and fans more
efficiently than mechanical systems.
 The energy that can be saved is ENORMOUS!
• Most applications pay for themselves in less
than two years

16.  Throttle Valves
 Inlet Guide
Vanes
 Outlet Dampers
 Mechanical
Speed Changers

17. I Flow is proportional to the motor
speed
II Pressure is proportional to the motor
speed SQUARED
III Power is proportional to the motor
speed CUBED

18. Inlet Vanes vs VFD
Inlet Vanes
VFD
0
20
40
60
80
100
120
Inlet Vane
VFD

19. PERCENT FLOW
0
20
40
60
80
100
120
Throttle Valve vs VFD
Pump Energy Use
Inlet Vanes
VFD
Throttle Valve
VFD

20. BUILDING SYSTEMS
Air Systems
Water Systems
Chillers
Cooling Towers

21. Energy Savings Caluculations
ENERGY SAVINGS - VFD vs MECHANICAL DAMPING
Motor Horsepower ? 100 Useage Profile kWh/Year Saved
High or Std. Efficiency ? High % Speed Hours 145666.32
Motor Efficiency 0.95 100 0
Fan or Pump Load ? Pump 90 0 Annual $ Savings
If a Fan load : 80 0 $14,567
Inlet or Outlet Vanes? Inlet 70 0
Utiity rate ($/kWh)? 0.1 60 0 PAYBACK ESTIMATOR
Full Load Input Power 78.53 kW 50 3500
Load Designation? Supply Pump 40 0 Project Cost
30 0 $10,182
20 0
Rebate
Months
8.39
Designed by Charles Forsgard - Square D R4.0
0
2000
4000
100 90 80 70 60 50 40 30 20

22. Motor Horsepower ? 30
High or Std. Efficiency ? High
Motor Efficiency 0.94
Fan or Pump Load ? Fan
If a Fan load :
Inlet or Outlet Vanes? Inlet
Utiity rate ($/kWh)? 0.07
Full Load Input Power 23.81 kW
Load Designation? Supply Fan

23. Useage Profile
% Speed Hours per Yr
100 0
90 0
80 0
70 0
60 0
50 8736
40 0
30 0
20 0

24.  1-500HP at 460V
 Available in Open, Enclosed,
and MCC designs
 Targeted to be highly
competitive drive
 Enclosed “Econoflex” for
Commercial Buildings
 Enclosed 8839 58M for
Industrial Buildings

25. Designed to be the most connected drive
on the market today!
• Modbus
• Modbus-Plus
• Profibus
• Devicenet
• FIP IO
• Interbus-S
• Unitelway
• N2 (Johnson Controls)
• P1
• Lonworks
• Ethernet –
WEB ENABLED!
TRANSPARENT READY

26.  The Schneider Electric Advantage:
• TRANSPARENT READY! (8806DB0103)
• True Short Circuit Current Ratings
(8800PD9702)
• MCC construction
 Only AB has and they are thermally limited