Drives

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.

NS

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N ss

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5

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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