As VFDs are the most popular method of powering motors in new commercial installations, most three-phase motors sold today are, in fact, inverter-rated. Instead, they are built out of a three-phase induction motor or generator, called an idler, on which two of the terminals (the idler inputs) are powered from the single-phase line. I have seen intermitant downtime due to a bad overload many times. (Many manufacturers and dealers specifically state that using a static converter will void any warranty.) The static phase converter is used to start a three-phase motor. Yeah its been a long day too...I have no business over thinking things this late...I was thinking about the motor starter on the machine itself not the starter for the converter...Thats what I assumed the origional post was about. or maybe its fresh in my mind because I smoked a coil on the last one I did(Machine side) becuase I plain had my head in my but and didnt look for the high leg going to the control circut. they should be here today....i'll let you know.Trade: Electrical; Commercial and Residential ServiceYeah, he's talking about the overloads. I'd almost put money on the rotary phase converter having a dead phase, and it's single phasing the planer. Balancing a Rotary phase converter for hard start.

LRG WoodCrafting A manufacturer may void the warranty on a motor powered by a VFD unless the motor is "inverter-rated." At the beginning of the 20th century, there were two main principles of electric railway He created an electric machine called a synchronous phase converter, which was a single-phase The direct feed from a standard electric network makes the system less complicated than the earlier systems and makes possible simple recuperation. For additional sizing assistance call 1-888-743-6832. The asynchronous traction motor can run on a single RPM determined by the frequency of the feeding current and the loading torque. As a general guideline, unbalanced three-phase power that exceeds 4% in voltage variation can damage the equipment that it is meant to operate. Operating such a motor at a lower-than-normal speed will substantially reduce the cooling airflow, increasing the likelihood of overheating and winding damage or failure, especially while operating at full load. The reason one leg reads higher to ground than the other two is because rotary phase converters produce a delta output, meaning ground is actually a center tap between the two hot legs of a 120/240 volt single phase service. Some of the techniques include, This page describes how I built one of my Rotary Phase Converters. This is because of their relative low cost and ability to generate three-phase output from single phase input. A typical VFD functions by rapidly switching transistors on and off to "chop" the voltage on the DC buss through what is known as The output of a quality VFD is an approximation of a In the past, VFDs that have a capacity greater than 3 hp (2.2 kW) were costly, thus making the rotary phase converter (RPC) an attractive alternative.
The high leg is only 'high' with respect to ground. LRG WoodCrafting Nevertheless, commercial-grade VFDs are produced that require three-phase input, as there are some efficiency gains to be had with such an arrangement. - YouTube However, this makes the power balance, and thus motor efficiency, extremely poor, requiring de-rating the motor (typically to 60% or less). I'd almost put money on the rotary phase converter having a dead phase, and it's single phasing the planer. This means that when using your meter you will measure 120 volts to ground on two of the three lines, but around 240 volts to ground on the third. The high leg has absolutely nothing whatsoever to do with this problem. Other quality measures include the harmonic content of the power produced and the The quality of three-phase power generated by such a phase converter depends upon a number of factors including:

A VFD converts AC power to DC and then converts it back to AC through a transistor bridge, a technology that is somewhat analogous to that of a switch-mode power supply.

The control circuit of a 3 phase motor starter coil just breaks one leg of two of the three phases (208 or 240). My generated leg is L3 and I have run capacitors from L1 to L3 and L2 to L3. A major concern with three phase power is that each phase be at similar voltages. and I am installing this old equipment into a new single-phase builing using a phase converter(no neutral),,Wouldnt I be applying 240 to a 120v coil if I had the high leg hooked to it?? A plus is many VFDs can produce a "soft start" effect (in which power is gradually applied to the motor), which reduces the amount of current that must be delivered at machine start-up.

At DrywallTalk.com we cater exlusivly to professional contractors who make their living as a contractor. However, L1 to L3 and L2 to L3 will be 120 degrees out of phase with the input voltage, thus creating 3 phase power. You see, he measured almost no amp draw on the one leg the other day. With increasing power output, three-phase motors have preferable characteristics to single-phase motors; the latter not being available in sizes over 15 hp (11 kW) and, though available, rarely seen larger than 5 hp (3.7 kW).


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