How to Coverter from 110v 60Hz to 240v 50Hz

Transformer step ups or step down the Votage at same frequency so if you use 110 V 60 Hz input accordingly it will step up the voltage with same frequency i.e 60 Hz at 240 Volts. If u use AC on 240 V 60 Hz it would draw high current.

You can choose following two options.

1) Change Compressor winding in electrical winding shop i.e get it rewinded for 220Volts 50 Hz- it would be cheeper.

2) Put VFD single phase as 110 V olt 60 Hz input and Convert the Output to 60 Hz 220 volts - but this would be ver-very expensive as more than your AC.

Since a 110V 50 Hz system you are using at 110V 60 Hz, the compressor motor runs at 20% more RPM (50:60) The power requirement now moves to a power of this ratio typically 3 ie now the pump demands 1.7 times the power that was with the original 50Hz. Add to this the derating requirement of the motor as you increase the frequency. Usual method is to keep V/Hz constant. However the things complicate in the pump applications where the lower magnetisation might have demanded more current (110V 60Hz instead of 132V 60Hz). (110/50 = V/60 ) All these combinations might be forcing the motor to draw excessive current.

And sorry there is no easy and cheap method to convert the frequency of supply.

get hold of an electrician and change the motor to a 60Hz motor but then the compressor RPM have to match.

Added power required to run the compressor at a higher speed is correct BUT -

Here's the thing - speed of an AC motor depends on number of poles in the stator and frequency (RPM=120*freq/poles) (less some % "slip"). Since the number of poles must be discrete units, ie 2, 3, 4, etc. you cannot "rewind" the motor to run a 4 pole to run at 1500 RPM on 60 Hz power feed.

Rewinding the moter can reduce the heat generated but this can also be reduced by running a 50 Hz motor at slightly higher (10% or so) voltage on a 60 Hz system. The higher voltage will reduct the amps.

You are quite correct the transformer should have been wound 110 V to 265 volt and rated and rated at 4000Kva to allow for heavy start up current. A 2500Kva transformer might have start up problems as this has less than half of max running current culpability,and the higher frequency would reduce starting torque causing the motor to draw more current, this would give a drooping voltage from the transformer etc.

Properly set up the compressor would run a bit faster with increased capacity which should be well within the tolerance of the unit.

Ah, come on, 2500Kva or 4000Kva? Thats 2.5 Mva to 4 Mva.

Decimal points please!

We could light a subdivision with that!

Yep sorry should be VA not Kva brain was just to enthusiastic.

Overall, it will probably be less expensive to buy a new air conditioner. Sell the transformer - maybe back to the shop.

If the equipment is not 50/60 hz rated, sell it and buy one for the frequency and voltage you need.

There are several ways to convert - all of them are more expensive than buying a new air conditioner selected for the right voltage and frequency. Unfortunately you made poor choice before checking out the problems inherent in such a purchase.

Please check decimal points. 25000va? Thats over 100 amps at 240v! I would have expected 2,500va.

How about a honda generator?

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Why not instal a motor generator of the right size with a motor that runs on 60 hertz and produces 220 v at 50 hertz

That's funny. I don't care who you are. Obviously, the OP does not have a real good command of the english language so, I am not surprised he calls a yacht a "yatch." Let's cut this guy some slack though, as he is obviously rich. He owns a "yatch" for Pete's sake! Being rich, he should match his Alpels and Ornangs. 110 60HZ stuff with 110 60 HZ stuff and 240 V. 50 HZ stuff with 240 V. 50 HZ stuff. He could always buy a 110 V 60 HZ motor and attach it to a 240 V. 50 HZ generator with a variable speed pulley to get the frequency right. He will need a frequency meter to calibrate though. This is what we did to be able to check out 240 V. 50 HZ equipment that we built here in the states to be shipped overseas to a country that had 240 V. 50 HZ as their standard electrical supply. It's expensive but after all, he's rich... come to think of it, why is he going to all this trouble if he is rich? Either buy a new generator or a new air conditioner. What's so hard about that?

And I thought a Coverter terraformed a cove!

Hi Keywalker,

Thank you very much,i hope one day soon i am rich also...for your info i am just an 70yrs old mechanic in a glass plant and i have to command 6 languages included my native language in order to communicate all levels of my colleageas.Pls understand my situation..i just got a small and broken yatch (thank you for correct me)...

Any where thank you very much again to point out my mistake...and hope one day i would able to buy new yacht. and invite you to Sempadan island area...

Regards

Sorry about that. It was actually Hooker that was complaining about the "yatch" though. I just thought it was funny. But your problem is going to cost you some money to fix, I'm afraid. Either you need a new transformer, new air conditioner or new generator (by new I am not ruling out used if money is an object). Do you have a Wal-Mart on Sempadan Island? If not you might try ebay. If at all possible, matching the frequencis is preferred. However, it is not an absolute necessity if the motors on your air conditioner (compressor + fan) will tolerate the higher frequency. As long as you have overload protection, it should be safe enough for you to try. And, yes, I would love to visit some day... when I get rich that is.

Didi you go through #2?

Sorry to say, it may be better to change the compressor motor.

Let me repeat the extra RPM of the motor (50 vs 60Hz) will cause the power to go up by 1.7 times. And that will be compounded by the extra current due to the voltage.

The transformers are not frequency dependent (as written in one of the posts ie the change in frequency do not change the output voltage significantly - it does just a bit due to the variation in the equivalent reactance drops, but leave that aspect. For your case it does not matter).

For transformers

V1/V2 = n1/n2 ( winding ratio) and as you see no frequencies are there in the equation.

For Motors

V1/f1 = v2/f2 to keep the same magnetising current.

So for 60 Hz it expects

V = 60/50 * 110 = 132 V

But since you are feeding 110V, the system works like undervoltage fed, and as you know, in these loads the voltage drop makes current to go high to compensate (keep the power approx constant)

So bothways you are making the current to go up, and that is tripping your protective relay.

So either go for a compressor with the corresponding rating or better as some one suggested, put a pully or chain sprocket with the required ratio. May be you will be able to canibalise one from a bicycle ?

AC units are on sale now. 6000BTU can be bought new for $90. 10BTU are less than $200 (Canadian) for basic units. I assume the same can be had for the other voltages and frequencies, since they are made in asia anyways.

The solution seems obvious.

Hi aikhh,

Sorry about the flippant remark about yatchs. It's just that I used to live aboard my own sailboat and have seen two threads about "yatchs" lately. I probably should be more liberal about using smileys. It was meant to be in fun.

And, good luck on the air conditioner. A company I used to work for here in the US started shipping product to Brazil. We had to install a monster toroidal transformer to correct for voltage/hertz. They were custom made for the product and produced enough heat to continually cook dinner on them. I think you'd be better off buying another air conditioner.

Hooker

Since you are using a 50 HZ transformer and hooking up 60 HZ to it you are producing too much voltage. It's that simple. The voltage is produced when the magnetic lines pass the windings. Increase the frequency and you increase the voltage which in turn increases the amperage for a fixed load. If you had a transformer rated for 60 HZ you might be more successful. It depends on how well the motor in your air conditioner can handle the increase in speed. Your air conditioner motor is rated for 50 HZ as well. Go to Wal-Mart and get a cheap 110 V. 60 HZ air conditioner and stick it in the window and you're good to go.

This type of question is so general that NOBODY should write suggestions.

Proper answers (some were close to reality) MUST be given at list with more data: E.g. motor's wiring diagram.

A little bit physics:

1. Single phase motor 240 V/50 Hz may have a capacitor. Its reactance will be 80 % lower at 60 Hz compare to the one marked for 50 HZ. At the same voltage (240 V) the current will be 125% of its rated value, right?

2. Speed: yes 20% higher at 60 Hz -> so output power higher -> drawn current from power supply also higher.

Everything seems to work according to Physics (AC theory). The Rest of conclusion is up to you.

Nobody has asked if the compressor might be belt driven and he could change the pulley sizes to reduce the required HP and make it work. Its probably a sealed unit.

Yup, I too noticed that jump in logic.

Almost all AC unit compressors I see today are sealed units. (Excluding automotive).

I wonder if this country dependent?

Hi southern123,

You are not even can answer my so general question pls...single phase air conditioner curcuit you have never seen before ?