EMA Inc.

Robicon Perfect Harmony Capacitor Failures

People operating the Siemens Robicon Perfect Harmony medium voltage VFD often don’t realize the need for replacing the bus capacitors after 7 years of operation. The chance of a bus capacitor failure increases exponentially after 7 years of operation due to degradation of the electrolyte and dielectric material. The situation is exacerbated by increased heat. If the bus caps fail, it can result in damage to the input rectifier section of the cell and the IGBTs, resulting in the line


“Cookie Cutter” VFD solutions are not always the answer

Variable Frequency Drive applications are rarely identical, even though at first glance, the VFD applications may look similar.


VFD in Outdoor Enclosure

VFD s can be provided either in a free standing NEMA 3R outdoor enclosure, OR, in what’s termed an “E-House.”


Mine VFD: Variable Frequency Drives in mining

VFD s in mining operations are becoming more and more common. EMA has both sold and serviced the mine VFDs.

used VFD

Used VFDs for Sale

EMA carries a variety of used and refurbished VFDs that are available for immediate delivery. At the moment we have up to 300 HP ready for shipment, but the used inventory varies almost daily.

Yaskawa E7 VFD

Yaskawa E7 VFDs in Stock NOW

Yaskawa will cease manufacturing their popular E7 VFD in a few weeks, and EMA has purchased substantial stocks. We’re stocking these in both our New York and Georgia locations.


Toshiba Medium Voltage VFD for Sale

EMA sells and services medium voltage VFDs, and if you’re in the market for one, we’re the easiest, least hassle, and fastest company you will find to help you.

oil platform

Electric Motor Drive Repair

EMA is one of the nation’s premier electric motor drive repair companies. While many people thought the advent of lower cost VFDs and drives would damage the electric motor drive repair business; it has, in fact, remained strong.

WEG AC Motor

2 HP WEG motors in stock at great prices

EMA has a number of high efficiency WEG 002218EP3ERS 2 HP, 143/5T Frame, 208-230-460 V, Three Phase 1740 RPM motors in stock for immediate sale.


Siemens Robicon Medium Voltage Power Cells in Stock

EMA is stocking refurbished Robicon Perfect Harmony Medium Voltage Power Cells. These units come with a warranty.