VFD With Step Down Transformer for Speakers and AVR

Talk to these people (not an endorsement - other power changer suppliers are available).

I would have thought that the input to the unit would be pretty much immediately rectified and filtered to DC, and therefore the input frequency would have little effect on the device. Most amplifiers will work just as well on 50Hz as they will on 60Hz of the same voltage.

Occasionally the filtered DC output voltage can be a tad lower at 50HZ due to the higher XC effect of the filter caps, but I would not expect it to be of great concern.

Are you certain that there is not something else that may be causing your problems?

Edit:- A check of a local Marantz website shows that the unit may be connected to either 50 or 60Hz. Although this is a 240V unit, I would not expect a 120v one to differ greatly in that regard

I bought Marantz AVR and speakers from US Amazon.com. Each Marantz is different, some other Marantz devices might support 50 to 60Hz. But the one which i have will support only 120v 60hz frequency.

I thought the same before buying that step down transformer like It will convert from 240 to 120v and 50Hz to 60Hz, but it is only converting 240 to 120v, Hz output is same as input Hz. Later i read this point.

The device is switching on and with in 4 seconds, it's switching off with blinking indication. As i read online help for this unit, if input power is incorrect, it will off and blink.

So, what's wrong with swapping it for a replacement that has the correct power input configuration, and saving the trouble and outlet on a power converter unit?

This is hardly an Engineering consideration; merely a commercial one.

I tried for replacement, but its not be possible, because I bought form USA and I stay in Malaysia.

Nevertheless, re-ordering the correct one, from wherever, and selling-on the wrong one, into wherever, remains among the options for a solution.

No, you cannot use a VFD for this purpose. VFDs are designed to work for AC induction motors. It USES the inductance of the motor to complete the process of recreating a pseudo-AC 3 phase voltage. You don’t have a motor and the power supplies in the audio equipment is not designed to handle the harmonic rich PWM output of the VFD, even IF the VFD does not trip out when it sees no load on one of the phases.

If you must proceed with using this audio equipment in a part of the world it is not designed for, used a voltage converter designed for this purpose. It’s likely however that if this version is not rated for dual sources of input, that means it is older and uses linear power supplies instead of switch mode power supplies. That might mean that any electronic frequency changing system is going to result in noise coming through the audio as background humming.

The Transformer which I have is...

https://www.amazon.com/Dynastar-Converter-Transformer-Lifetime-5-Year-Warranty/dp/B01576TI6I/ref=sr_1_2?keywords=1750w+transformer&qid=1569549155&sr=8-2

Is there any other way to convert only frequency 50Hz to 60Hz. This transformer will take 50/60Hz input and same output.

Unfortunately not. The transformer does not alter the frequency like an electronic VFD or electronic inverter.

Probably not worth the cost....$850...but it can be done...

https://www.powerxchanger.com/store/slimline-series/voltage-frequency-converter-xs-05-ga-general-application.html?gclid=Cj0KCQjww7HsBRDkARIsAARsIT6cF3CUJB2v-lavFUfzyEchEn_icDICtKjxXY3udP2gqp5qsdc5NJIaAqhIEALw_wcB

I would return everything and get the proper units...

https://www.forbes.com/sites/marksparrow/2019/08/01/marantz-launches-its-best-stereo-receiver-for-music-lovers-who-want-entertainment-from-a-single-box/#609e88194526

This will support for one device. because I need to buy 3 times the rated watts of device. I have AVR 230Wt and Speakers 230wt, So I need to buy 2 units which is very expensive than the devices. Instead I can buy new same devices which support 240v Input.

It would likely be cheaper to just buy the correctly rated amplifier unit(s).

It can be done with a step up power inverter but it is expensive and a little messy. I wouldn't recommend trying to use a motor VFD to perform the conversion.

Yes, You are so true.

but since I have already bought these devices which I spent $11,000. Initially I spoke with one of the device support engineer, they have suggested step down transformer to use in my country. I thought that Step down transformer are made for this purpose. After I have tried, its failed. I didn't knew when I bought all these, now because of frequency both the devices are kept aside.

Now I understood that conversion of frequency from 50Hz to 60Hz is very complex and sensitive for electronic devices, especially audio equipment's.

If anyone find the solution which is cheaper, I will be very happy, otherwise my $11,000 will be trash.

Hi Praveen,

There are transformers on the market with frequency converters look on google and you can find them. they are a little expensive but a lot less than 11000 USD

I know nothing about this company -- it was the first legitimate looking one that popped up on Google .

Check them and search your self. Ali Baba showed up a lot of them but they all looked fake to me.

Good Luck

Expat07

Frequency Converter 50Hz 60Hz, and 400Hz | ATO.com
https://www.ato.com › frequency-converter

Built in step-up/step-down transformer convert US power supply 120V 60Hz to UK 230V/240V 50Hz, step down 1-phase 220V 50Hz to 110V 60Hz. Three phase ...

11,000 Malaysian Ringgit = $2627.13 USD

That is very unfortunate if that is the case. Many of the amplifiers down here support dual 50/60Hz operation.

Any chance on a return and refund?

You may have to sell it online and take the loss and buy the correctly rated one as opposed to purchasing an expensive inverter to get the one you have to operate.

I bought these last year and even to return i need to go USA, can't return from Malaysia.

It was my mistake that i thought step down transformer will take care of everything.

No one in Malaysia will buy this online, because of input power. I can sell this one only in USA.

Thanks for your concern.

<...spoke with one of the device support engineer...>

Bear in mind that this individual has a vested interest in its not returning for a refund!

<...$11,000...>

That would be a trivial amount in Zimbabwe.

A motor-generator set with 240v 50hz motor and 120v60hz generator.

You mean VFD?

If VFD, it won't be the best solution as suggested by some one in this discussion.

If not VFD, Please clearly explain the solution.

Thank You

<...VFD...>

No. A motor-generator, as indicated.

_{John: 11, 35.}

One way to achieve this is to use the motor generator set as described but not direct coupled as the 50hz 2 pole synchronous motor will run at 3000RPM while the generator will need to run at 3600RPM. I have used a similar setup on an oil rig where the conversion was from 600v 60 HZ to 415V 50HZ and was achieved by having a 10 inch pulley on the motor driving a 12 pulley on the generator but then I was extracting 25KW not a smaller amount but it would work with the pulley ratios reversed to get a step up in speed.

Surely you could return the goods for a refund or has the time limit expired?

Return is not possible because someone brought from USA to Malaysia, no one will take these huge items back for return.

What is Motor Generator? is this VFD?

If not VFD, Is it good for to use for Audio equipment's?

https://www.frontierpower.com/products/generator-sets/prime-continuous-power/land-based-prime-or-continuous-generator-sets/motor-generator-sets/

See #20⇑.

This setup will not be very efficient nor will it be silent, and unless he can find the parts for very cheap, then it will be cost prohibitive as well...all-in-all not worth the effort or expense.....

The only way I see that this system could be made to work is if he could procure an accurate wiring diagram for the amplifier and convert the components needed to accept the power source available....and this would probably only be worth it if the labor was free, or really cheap....but an accurate wiring diagram with components listed, is probably not easy to acquire...

There seem to be all sorts of reasons for not doing things and it is best not to constrain the problem beyond the point where one of the options is viable.

Evaluation of the options and selection of the best solution is very much on the basis of personal preference, something with which the forum cannot really help.

http://www.gohz.com/single-phase-frequency-converter

Those products are very expensive. For that price I can buy new items that support 240V.

The forum cannot help with option evaluation.