The voltages between legs is as follows: L1 & L2 = 229 volts L1 & L3 = 239 volts L2 & L3 = 241 volts
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. That's not to say that it didn't fail that way. A three-phase motor running on a single phase cannot start itself because it lacks the other phases to create a rotation on its own, much like a crank that is at dead center. 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. However, this makes the power balance, and thus motor efficiency, extremely poor, requiring de-rating the motor (typically to 60% or less). 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. The motor then runs on a single phase with a synthesised third pole. Trade: Electrical; Commercial and Residential ServiceTrade: Electrical; Commercial and Residential Service
Overheating, and quite often destruction of the motor, will result from failing to do so. The high leg is only 'high' with respect to ground. 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. 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: The A common measure of the quality of the power produced by an RPC or any phase converter is the voltage balance, which may be measured while the RPC is driving a balanced load such as a three-phase motor.
As the VFD generates its AC output from the DC bus, it is possible to power a three-phase motor from a single-phase source. readings at machine before starting motors I ordered new starter coils with a little more upper range. You see, he measured almost no amp draw on the one leg the other day. Some of the techniques include, A line to line voltage check between every combination of L1, L2, and L3 phase converter outputs under load will sort that out in a hurry. 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. I'd almost put money on the rotary phase converter having a dead phase, and it's single phasing the planer. This is perfectly normal and will work just fine for most motor loads.
(Many manufacturers and dealers specifically state that using a static converter will void any warranty.) You will not smoke a coil on a 3 phase motor starter circuit with a high leg. This is primarily because most induction motors are forced-air cooled by a fan or blower driven by the motor itself.
An oversized static converter can remove the need to de-rate the motor, but at an increased cost. The solution was to use more secondary windings on phase converter, and more windings on motor different number of magnetic poles. A three-phase induction motor that is spinning under single-phase power applied to terminals L1 and L2 will generate an electric potential (voltage) across terminal L3 in respect with L1 and L2. They may be discolored, from repeated heating, but that (to me) would be more symptomatic of him single phasing the motor for so long. As I have mentioned in an earlier post, I built a 10 HP rotary phase converter. "Тяговые электрические машины" (Traction electrical мachinery) Москва, Транспорт, 1991 - 343 p., p.231
RPC manufacturers use a variety of techniques to deal with these problems. Demand exists for phase converters due to the use of three-phase motors. 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?? Where were the voltage measurements in post #10 taken, exactly? - YouTube
LRG WoodCrafting
Захарченко Д.Д., Ротанов Н.А. A basic, single-voltage three-phase induction motor will have three windings, each end connected to terminals typically numbered (arbitrarily) as L1, L2, and L3 and sometimes T1, T2, T3. A remote start stop can be rigged up using low voltage buttons and relay. The high leg is still the same nominal phase to phase … All traditional phase converters are high leg delta.
I just read the thread in the link. A major concern with three phase power is that each phase be at similar voltages. LRG WoodCrafting
This is for the customer that has his/her own 3 phase motor to use as an idler motor. My generated leg is L3 and I have run capacitors from L1 to L3 and L2 to L3. I just read the thread in the link. However, L1 to L3 and L2 to L3 will be 120 degrees out of phase with the input voltage, thus creating 3 phase power. As a general guideline, unbalanced three-phase power that exceeds 4% in voltage variation can damage the equipment that it is meant to operate. The rotary phase control panel includes a motor starter, power factor correction capacitors and input and output terminal block connections. 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. However, modern VFDs have dropped considerably in cost, making them more affordable than comparable RPCs. A manufacturer may void the warranty on a motor powered by a VFD unless the motor is "inverter-rated."
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