FRENIC-EcoPAK LHutilizes a variable frequency ac drive and a Schaffner ECOsine harmonic filterin one complete package solution for an IEEE519 1992 compliant for variabletorque fan and pump motor applications. FRENIC-EcoPAK LH is availablefor 25 to 500 Hp 460V ac 3Ph motor applications. With the increasing emphasison reducing energy consumption backed by energy rebates and maintaining powerquality to avoid penalty fees from utility companies, variable frequency drivesare being required to comply with IEEE519 1992 more often. FRENIC-EcoPAK LH allows contractors topurchase and install a variable frequency drive solution that will save energywhile maintaining harmonic current and voltage distortion at or below thatrequired by IEEE519 1992. Thus allowing a variable frequency drive solutionperfect for installations where other sensitive electronic equipment isconnected to the same electrical distribution system. The most common approachtaken by other variable frequency drive manufactures is to offer multi-pulsedrives, this approach has some inherent disadvantages, including large physicalsize, and high cost. In order to providea multi-pulse drive typically manufacturers install an additional six or 12 pulsediode bridges external to the drive and provide a large phase shiftingtransformer. A multi-pulse drivesolution is typically larger, higher in cost, and less efficient than FRENIC-EcoPAKLH's variable frequency drive andSchaffner ECOsine harmonic filter solution.

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