Based on over 15 years of 18-pulse drive experience andthe highly successful 9000X Series of adjustable frequencydrives, the Eaton CPX9000 drives use advanced clean power technologyto significantly reduce line harmonics at the drive inputterminals, resulting in one of the purest sinusoidalwaveforms available.The Eaton CPX9000 drives deliver true power factor, so in addition toreducing harmonic distortion, it prevents overheating ofupstream transformers and the overloading of breakers andfeeders. It allows adjustable frequency drives to be appliedto generators and other high impedance power systems.Designed to exceed the IEEE 519-1992 requirements forharmonic distortion, the Eaton CPX9000 drives are the clear choice forapplications in the water/wastewater, HVAC, industrialand process industries where harmonics are a concern.
While utilities may deliver relatively clean power (puresinusoidal waveforms), nonlinear loads such as computers,
drives, and electronic ballasts can introduce undesirableharmonic currents into the power system.Many facilities demand the IEEE 519-1992 standard forminimizing harmonic distortion be met to eliminate thepotential for equipment failures that can lead to increaseddowntime and costs.The first step in developing an appropriate clean powersolution is a facility analysis. Eaton performs facilitysimulations for existing facilities and during the design andconstruction phase of new facilities. In addition to offeringthe CPX9000 solution, Eatons Electrical Systems andServices organization is equipped to measure, analyze, andcorrect harmonic and other power quality issues.After the simulation is complete, a number of steps can betaken to ensure IEEE 519-1992 compliance. Majortechnologies include passive filters, active filters, additionalinductive reactance, phase-shifted sources, 12-pulse rectifiersand the Eaton CPX9000 clean power drives. While all of technologiesare viable, the Eaton CPX9000 is selected most often becauseunlike the other technologies, it meets IEEE 529-1992 at thedrive input connection even if power system conditionschange. This means no re-tuning, no adjustments and nonew system analysis.
Harmonics are distortedelectrical waveforms thatintroduce inefficiencies into yourelectrical system. They produce
wasteful heat and can causeplant issues and fees fromyour local power company.Harmonics flow into the
electrical system as a result ofnonlinear electronic switchingdevices, such as adjustablefrequency drives (AFDs),
computer power supplies andenergy-efficient lighting.Similarly, companies withheavy motor, AFD and lighting
loads need to be aware of theproblems that harmonics cancause. These problems include:
- Increased electrical usage
- Increased wear and tear onmotors
- Higher maintenance costs
- Power quality problemsupstream and downstream
- Utility penalties for introducingproblems to the power grid
The Eaton CPX9000 drives‘ 18-pulse clean power will consistentlymeet IEEE-519 standards byreducing current distortion to5% or less. The 18-pulse driveoffers 50% better harmonicratings (10% for 12-pulse vs. 5%for 18-pulse) at only a slightlyhigher cost. The efficiencyof this new drive has helpedto take harmonic reduction toa new level for manufacturingfacilities across the globe. Itmeets IEEE standards in everycase, attenuates all harmonicsup to the 35th, stops harmonicsat the source, is insensitive tofuture system changes, andincreases the life of the drivethrough incredibly stable DCbus voltage (18 small inputsinstead of six large ones). The18-pulse converter is the mostcost-effective solution at 50 hpor higher.
To learn more about Eaton CPX9000 drives or to download technical documents, visit the Eaton Website.
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