drives
TRANSCRIPT
DrivesDrives
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.
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ACLineInput
DiodeBridge
Converter
DCBusLink
TransistorInverter
ACOutput
_
+
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
Throttle Valves Inlet Guide
Vanes Outlet Dampers Mechanical
Speed Changers
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
Inlet Vanes vs VFDInlet Vanes vs VFD
Inlet Vanes
VFD
0
20
40
60
80
100
120
Inlet Vane
VFD
PERCENT FLOW
0
20
40
60
80
100
120
Throttle Valve vs VFDThrottle Valve vs VFD
Pump Energy UsePump Energy Use
Inlet Vanes
VFD
Throttle Valve
VFD
BUILDING SYSTEMSAir SystemsWater SystemsChillersCooling Towers
Energy Savings CaluculationsEnergy Savings Caluculations
ENERGY SAVINGS - VFD vs MECHANICAL DAMPINGMotor Horsepower ? 100 Useage Profile kWh/Year SavedHigh or Std. Efficiency ? High % Speed Hours 145666.32Motor Efficiency 0.95 100 0Fan or Pump Load ? Pump 90 0 Annual $ SavingsIf a Fan load : 80 0 $14,567Inlet or Outlet Vanes? Inlet 70 0Utiity rate ($/kWh)? 0.1 60 0 PAYBACK ESTIMATOR
Full Load Input Power 78.53 kW 50 3500Load Designation? Supply Pump 40 0 Project Cost
30 0 $10,18220 0
Rebate
Months8.39
Designed by Charles Forsgard - Square D R4.0
0
2000
4000
100 90 80 70 60 50 40 30 20
Motor Horsepower ? 30 Useage ProfileHigh or Std. Efficiency ? HighMotor Efficiency 0.94Fan or Pump Load ? FanIf a Fan load : Inlet or Outlet Vanes? InletUtiity rate ($/kWh)? 0.07Full Load Input Power 23.81 kWLoad Designation? Supply Fan
Useage Profile% Speed Hours per Yr
100 0
90 0
80 070 060 050 873640 030 020 0
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
Designed to be the most connected drive
on the market today!
• Modbus• Modbus-Plus• Profibus• Devicenet• FIP IO• Interbus-S• Unitelway
• Modbus• Modbus-Plus• Profibus• Devicenet• FIP IO• Interbus-S• Unitelway
• N2 (Johnson Controls)• P1• Lonworks
• Ethernet – WEB ENABLED!TRANSPARENT READY
• N2 (Johnson Controls)• P1• Lonworks
• Ethernet – WEB ENABLED!TRANSPARENT READY
The Schneider Electric
Advantage:• TRANSPARENT READY! (8806DB0103)• True Short Circuit Current Ratings
(8800PD9702)• MCC construction Only AB has and they are thermally limited
The Schneider Electric
Advantage:• TRANSPARENT READY! (8806DB0103)• True Short Circuit Current Ratings
(8800PD9702)• MCC construction Only AB has and they are thermally limited