The EMA Blog

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 [...]

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 [...]

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 [...]

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. The E7 has been a terrific product, enjoying the highest mean [...]

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. Although its not advised, [...]

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. EMA has been repairing DC Drives for over 20 years, so we’ve seen plenty of repair issues with DC Drives and Motors. Let’s [...]

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. It is generally cheaper to replace a standard small HP VFD than repair it. However, there are certain applications, specifically,  drives on precise machines like Bonfiglioli, [...]