with a 50/60Hz frequency stamp. ...........A electrical supply house recommended three buck boosters, one for each leg but that just seems wrong. GENERALLY, responsible motor manufactures do not list the motor voltage as "240V", that is what is referred to as the "distribution voltage". At 240V and 50Hz the ratio is 4.8V/Hz. 3) This decrease in torque can make the motor stall when trying to start under a heavy load. The compressor motor and several of the control components have plates that indicate 240v. 21 Feb. 208V Single Phase and 208V 3 Phase. Depends on the type of motor and actual HP vs. nameplate HP. If your phase converter is actually putting out 220V you should be fine, but I suspect if your power is anything like mine, you will be closer to 240V. The panel has a sticker that calls for 208V 3-phase. Can you run a 3 phase 220v motor on 208v 3 phase? Most newer motors will run 208-240 just fine. 208V Single Phase and 208V 3 Phase power are easy to use, but hard to understand. I have never dealt with 208V power before. with. Scenario. JavaScript is disabled. Again responsible motor mfrs, ie those who follow NEMA guidelines when designing for use in North America, will have an acceptable voltage variance of +-10% minimum, without appreciable loss of torque. No, there is no such thing as an adapter. Are they still in business? The ratio is determined by the winding design and can't be easily changed. UK, and Ireland have always been 415Y/240. That's because if you have a motor designed for 230V 50Hz and give it 60Hz, it spins 20% faster, but produces 17% less torque. Roughly, the torque is proportional to the square of the voltage so you would get about 75% torque. For 208V @ 60Hz the ratio is 3.46V/Hz. I was told that the motor will attempt to operate at a certain level and it will just draw more amps with the lower voltage. So, a 230 volt motor can operate as low as 207 volts. A 208V rated motor should not be run on 240V, nor should a 230V rated motor be run on 208V, motors rated 115/200-230V or 115/208-230V are fine either way, older 3Ø motors rated 220/440V will be fine on either a 208 or 240volt supply when connected for lower voltage. It is basically a large compressor and controls. Is it actually 240, or more likely 230. TECHNICALLY, a lot of 230V rated motors can safely run at 208V, but what you are doing is dancing on the thin ice of the built in +-10% voltage tolerance. The load torque demand is the same at the same speed, so the current will adjust itself at 115% of what was planned to be pulled by the load originally. I have never run into a residential 208 as that would pose a LOT of problems. A 208V rated motor should not be run on 240V, nor should a 230V rated motor be run on 208V, motors rated 115/200-230V or 115/208-230V are fine either way, older 3Ø motors rated 220/440V will be fine on either a 208 or 240volt supply when connected for lower voltage. If so, maybe they just backed off on North America once the Chinese began flooding our market and eroded profits. firstly, I have read this thread: Running motor with 208 V on 240 V feed but have not found much other info out there... More specifically, I am trying to set up a quincy 325 compressor pump and would like to run it with an 8.2HP 208V Baldor motor that I picked up cheap... power will be supplied from a 20HP RPC. The power I have coming in is 240V 3 phase. connecting one of the 240VAC leads to one of the stator terminals and the other to ground will not power up the motor. Your motor is rated at 200V at its terminals to allow for some drop between your service entrance, through feeders, branch circuits, etc. Since there is a voltage drop between the power source and the electric motor, the single phase motors are rated either 115 volt or 230. volt. As stated above, a good part of the time, the motors are OK with either 208 or 240. I’d like to point out that you are asking 2 possible questions: Is the system you outlined, a) a 230V motor on a 240V supply? IMHO, a buck/boost transformer CAN be used to at least partialy correct for voltage drop in the wires to the pump, but dont overdo it ! Flux is reduced to 208/240=200/230=86.7%. Hi Kammy, First, let's get a minor detail clarified.
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