A electrical supply house recommended three buck boosters, one for each leg but that just seems wrong. Also, I hear most people refer to 220v but here they talk about 240v. Similarly, can I use 208v instead of 240v? A 230 volt motor will produce its nameplate HP on 208 volts, but the service factor (overload capacity) will be lower. You really should keep the voltage to frequency ratio the same as what it was designed for. 208V Single Phase and 208V 3 Phase power are easy to use, but hard to understand. For a small cost, individual motors or groups of motors can keep running well on 240V after the building is converted to 208V. VerticalScope Inc., 111 Peter, Suite 901, Toronto, Ontario, M5V 2H1, Canada. Thanks everyone. A 240 volt motor on 208 volts will run a little slower. Your generator can provide 240v single phase from the three phase it puts out. It is basically a large compressor and controls. ...........A electrical supply house recommended three buck boosters, one for each leg but that just seems wrong. The speed might be affected as well if it is an induction motor. If your load can get by … 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. Therefore, if you put 120V in, you will get 120V out, 208V in gets you 208V out, 240V in gets you 240V out, etc. For a better experience, please enable JavaScript in your browser before proceeding. can this machine be hooked directly to the 208V and run efficiently?What do you recommend? Yup. Since a standard three phase motor can be 200 or 230V, most know that 230V is no … 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. Scenario. So, if it was a 240V/50Hz motor, then the 120V supply needs to be at 25Hz (which is probably not practical). So if you use 208V, it is -0% and when it sags, and it will, your motor … The facility ran what they say is 220V three-phase and they tell me the transformer is in a wye config. 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. Anyway, I'm working on a project in Mexico, and my system is controlling some large vehicle gates that require 208V three-phase feed for the motor. in a single-phase motor, two of the wire terminals leading to the motor go to the stator winding and the third terminal (the green ground wire) is connected to the motor housing. If so, maybe they just backed off on North America once the Chinese began flooding our market and eroded profits. I have never run into a residential 208 as that would pose a LOT of problems. Anyone see anything wrong with a buck boost for this or am I giving the correct statement? Let’s assume a 120/208-volt (V), three-phase service was installed on a building a few years ago and the new owner of the building needs a standby generator for use during power outages. This motor was built to be used on 240V system. Utilities, who supply the distribution voltage, are supposed to maintain a +-5% range. Posted on February 21, 2018 February 21, 2018 by GMG. Such motors will typically have six leads coming out of the motor to the wiring box, or some of the connections may be screw terminals. No, there is no such thing as an adapter. I would aim to boost the 208 volt supply not to 230 volts, but to a full 240 volts or a little more. 240V, 60Hz, 3Phase, and the motor Power is 7.5KW. 230V (the actual nominal supply voltage is 240V) is probably too high for that motor. You could probably get away with just changing the control transformer. I have never dealt with 208V power before. Hi Kammy, First, let's get a minor detail clarified. 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. Putting It All Together. If you try running it directly from 120V, keep an eye on it to make sure it doesn't overheat. At present the 208 volt supply is dropping to 192 volts at the motor, or about 16 volts drop. What you would do then is use a 208V rated motor, then program the drive to provide 208V output at full speed, regardless of what the input voltage is. But I swear in Belgium they still are kicking some 230 L-L. 2 options: 208 to 240 volt transformer or a low price option would be a buck boost. Since you say that your motor is rated in kW instead of HP, it's likely that it is an IEC motor, and even if it says "50/60Hz" on it, there will be no added lower tolerance. 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. 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. 240V/60Hz/3Phase power and 7.5KW .How can I make this work without killing the motor. If it's connected 208, it most likely has a tap for 240. Unfortunately, motors designed for use in other parts of the world are generally NOT inclusive of 208V 3 phase, because that exists nowhere but here in North America. 208V is *not* the same as 240V. 3) This decrease in torque can make the motor stall when trying to start under a heavy load. This motor would allow the minimum voltage to be 180 volts. Depends on the type of motor and actual HP vs. nameplate HP. 208V Single Phase and 208V 3 Phase: Can I Run Single Phase Loads with a Three Phase Generator? Flux is reduced to 208/240=200/230=86.7%. 208V rated motor on a 208V supply has always bugged me - there's no allowance for voltage drop as when you connect 220/230V motors to a 240V supply. I would wire it up and put an amp probe on it, if the current draw is within reason, you should be fine. That goes against what I was taught (in the field, not formal training). 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 ! As stated above, a good part of the time, the motors are OK with either 208 or 240. Even though the system voltage of 3 phase 208 is within the -10% rating of the three phase 230 v motor, the 208 is allowed to vary to -10% or 187 volts -- and the motor will not work at that level. The electrical contractor installs a 120/240V single-phase, standby generator with a 120/208V, single-phase transfer switch. This only works for so long before the motor will have damage from too low of a voltage. 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. connecting one of the 240VAC leads to one of the stator terminals and the other to ground will not power up the motor. I have never dealt with 208V power before. Torque is current X flux. You can’t get it directly, though there’s a lot of equipment rated for 240V (usually specified at 230V) operation, that will still function at 208V, though it will produce 25% less power at that voltage. Building supplies 208V but equipment is designed to run on Power Supply of, It will probably work but it is not the most efficient way to go and it will probably affect the motors life. unit that is designed for 240 may have a problem with 208. There are problems and a potential for confusion, but substantial savings are available and the resulting "band-aid" will surely function longer than the load equipment. If cost effective, rewind the motor for 208V. Their real design is actually 230V 50Hz, then they will often say "50/60Hz" based on a slight de-rating of the mechanical power (kW) of the design. Correspondingly, is 220v and 208v the same? The control transformer could very likely be connected 240 as well. Come join the discussion about trade knowledge, tools, certifications, wiring, builds, scales, reviews, accessories, classifieds, and more! Three phase voltages generally available are 208 volt, 240 volt, 480 volt and 600 volt. When you run 120/208V single phase power into an isolation transformer, the two individual hot conductors of 120V are combined into one 208V waveform. 1) The motor will run slower. 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. Is the 208v a european voltage? For 208V @ 60Hz the ratio is 3.46V/Hz. A forum community dedicated to professional electricians, contractors, and apprentices for residential and commercial work. In this case the motor is overvoltaged by ~ +4% and that's fine. If the motor is marked 240 volts, it may or may not work on 208. This motor was built to be used on 240V system. GENERALLY, responsible motor manufactures do not list the motor voltage as "240V", that is what is referred to as the "distribution voltage". 21 Feb. 208V Single Phase and 208V 3 Phase. 2) The torque developed will drop to about 25% of its full voltage rating. Are they still in business? The same windings are getting less voltage and more current... it's going to equate to more heat. UK, and Ireland have always been 415Y/240. Most (but not all) 3 phase ovens can be re-connected for single phase provided the motor is single phase. An air cond. 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? The power I have coming in is 240V 3 phase. It talks about 208v. GENERALLY, responsible motor manufactures do not list the motor voltage as "240V", that is what is referred to as the "distribution voltage". The panel has a sticker that calls for 208V 3-phase. 4) There … I think that the point of sagging voltage is the main issue. The motors that are truly intended for 208 volts are nameplated for 200 volts. JavaScript is disabled. The panel has a sticker that calls for 208V 3-phase. I agree, but what we see over here from IEC motor mfrs is often a version that gets a different nameplate (maybe an export version?) The power I have coming in is 240V 3 phase. The motor nameplate voltage would be shown as the "utilization voltage" and will say 230V, or better yet, "208-230V". [FONT="]240V/60Hz/3Phase power and 7.5KW .How can I make this work without killing the motor.[/FONT]. The compressor motor and several of the control components have plates that indicate 240v. Note that you can wire it to the 208v panel only if it's connected as Delta (230v) as the difference won't be too high (22v) but im casee of the higher voltage configuration the difference will be too big. It is basically a large compressor and controls. If you run at a V/Hz ratio greater than design, the motor draws a large magnetising current because the stator iron magnetically saturates. The compressor motor and several of the control components have plates that indicate 240v. Lowering the motor input voltage by 50 % does several things. Three phase motors are rated 200 volt, 230 volt, 460 volt and 575 volt." How can this be? Voltage in my shop is about 240V. The problem may be with a motor. Look carefully at the nameplate of the motors and control transformer. However, this IEC design is NOT typically suitable for operation on 208V, it is something that IEC motor designers do not have to think about. 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. The motor says its a DAVI Asincrono Motor 220/380/440 Rpm 1420/1720 Hz 50/60 8.8/5.1/4.4 This is a motor for a milling machine any help would be appreciated! The motor nameplate voltage would be shown as the "utilization voltage" and will say 230V, or better yet, "208-230V". Or even 208-230. Is it actually 240, or more likely 230. In Euroland neither 60Hz nor 240V 3-phase is common. You must log in or register to reply here. You should boost it to be safe. Roughly, the torque is proportional to the square of the voltage so you would get about 75% torque. Can you run a 3 phase 220v motor on 208v 3 phase? In North America, many single phase motors motors in the range of 1 hp to 2 hp can be rewired to run at either 120 volts or 240 volts (or 115 vs 230 volts, it depends on what voltage is assumed "nominal"). I have an environmental cleanup system that was delivered to me second hand. For a better experience, please enable JavaScript in your browser before proceeding. Brook-Compton motors, from your neck of the woods, used to do that, but I haven't seen or heard from them in years. 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. So the motor is designed for the greater power rating, but is nameplated at the lower one and given the "50/60" label, usually without the back story details because the 60Hz rating is still valid, it will just actually be capable of slightly more kW at 50Hz than what they list and that's OK. The Machine is made in China for Use In North America.It's been delivered. JavaScript is disabled. So, a 230 volt motor can operate as low as 207 volts. When a motor is rated at 208/230 volts this means the motor will operate at the 208 volt rating, not 10% under the 208 volt rating. Isnt most of Belgium or any super old Euro network 3x230 volts (230Y/133 no neutral). 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. 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. Hereof, will a 240v stove work on 208v? with. Thing is the motor will not like the 240v for a very long time. Most newer motors will run 208-240 just fine. with a 50/60Hz frequency stamp. Your motor is rated at 200V at its terminals to allow for some drop between your service entrance, through feeders, branch circuits, etc. At 240V and 50Hz the ratio is 4.8V/Hz. The ratio is determined by the winding design and can't be easily changed. The motor business is really tough now. 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. or 240v. Your motor is designed to run on 208v single phase. 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. 208V is the nominal voltage supplied by the utility to the metering point.
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