The Archives

If you’re like me, you cannot stand that dreaded phone call you seem to get when you first sit down at your desk on a Monday morning.  You’ve yet to sip your coffee, heck you probably haven’t even removed your coat.  The last place you really want to be right now is sitting in a cold, dreary office away from the comfort of your warm, cozy bed.  Read More

Since EMA is a repair facility, we see all types of VFD s in our shop, including ABB VFD s. Given that ABB is a major player in the drive industry it’s imperative that EMA technicians are well versed in troubleshooting ABB VFD s. The  common VFD troubleshooting techniques apply to all manufacturers, but there are a few ABB VFD specific troubleshooting techniques that could push you in the right direction.   Read More

One of the most common inquiries we get here at EMA is for training on VFD s (Variable Frequency Drives).  Often however, it isn’t often cost effective to teach this to a small number of people on site.   We are offering an intensive two day seminar on Industrial VFD s in Norcross, Georgia on April 18th and 19th. Read More

Yaskawa is replacing their popular E7 HVAC VFD with their newest offering, the Z1000 VFD. EMA will continue to carry the E7’s in stock for the next few months, and I encourage our customers with an installed base to consider buying a spare drive. Read More

By Eddie Mayfield and Abdou Barrow, EMA Inc.

To begin, the design of modern variable frequency drives (VFD) takes output ampere readings very seriously.  The drive protection circuits in modern drives are excellent, which is why output device failures are very low given the fact that they routinely switch large currents. Read More

From our repair service experience, there appears to be fairly common misunderstandings about the basics of DC Drives and DC motors.. so here’s a short blurb that I hope will be helpful. Read More

As drive technology has become more user-friendly and reliable, our repair business has changed significantly. Gone are the days of repairing small HP VFDs with large surface mount components. Read More

EMA has elected to begin stocking 2000 HP Toshiba T300MVi  VFDs.   The part number is M3A44200SAA which is a 2000 HP, 4160 Volt medium voltage VFD in a Nema 1 enclosure.  Read More