Invertor required

[scooterist007]

I know the listing says single phase 220v to three phase 380v, but it is £80 and if that is true, it is not only a vfd, it's a generator as well, I looked at the data plate and although it is quite blurry, it doesn't say in the output section that it's 380v, it only says 3 phase and 2.2kw, it doesn't state what voltage.

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[Chaz]

I know the listing says single phase 220v to three phase 380v, but it is £80 and if that is true, it is not only a vfd, it's a generator as well, I looked at the data plate and although it is quite blurry, it doesn't say in the output section that it's 380v, it only says 3 phase and 2.2kw, it doesn't state what voltage.

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Very few actually make 380V. The HY ones DO NOT make 380V, they are listed as 220V and 380V input but do not upconvert. The Egogo (spelling) ones do but cost more. This seems to cheap for it to do the same ..... need true RMS meter and then see if it does, but dont be surprised if it does not.

[cropwell]

GH-1440A ? You could always ask Warco for their advice. Is the problem that you have moved the lathe out of the 3 phase environment ?

[sheffstaff]

Yes the Lathe has been moved from a 3 Phase environment I didn't know that the Lathe came from Warco ? I thought that they were from a place called Toolco.

[m_c]

GH-1440A ? You could always ask Warco for their advice. Is the problem that you have moved the lathe out of the 3 phase environment ?

It's not specifically a Warco model. Like lots of Chinese built machines, it'll be produced by a factory who will stick whatever logo you want on it, and give you a few different specification variations. Plus as it uses a pretty conventional naming convention (Gear Head 14" swing 40" between centres), it may of even came out of different factories, with some copies better than others (aka Sieg/Syil).

A quick google for GH-1440A brings up Warco, ToolCo, ETS, and Acra currently supplying that model. I'm sure there will of been more suppliers over the years.

[cropwell]

It's not specifically a Warco model. Like lots of Chinese built machines, it'll be produced by a factory who will stick whatever logo you want on it, and give you a few different specification variations. Plus as it uses a pretty conventional naming convention (Gear Head 14" swing 40" between centres), it may of even came out of different factories, with some copies better than others (aka Sieg/Syil).

A quick google for GH-1440A brings up Warco, ToolCo, ETS, and Acra currently supplying that model. I'm sure there will of been more suppliers over the years.

I mentioned Warco as it is green with ali info plates - as you say Chinese, probably from the weiss.com.cn stable. I can see why you are going for a VFD as £800 for a rotary converter - OUCH !

Cheers,
Rob

[m_c]

I mentioned Warco as it is green with ali info plates - as you say Chinese, probably from the weiss.com.cn stable. I can see why you are going for a VFD as £800 for a rotary converter - OUCH !

Cheers,
Rob

I'm pretty sure even Chester used to supply certain models in green, so I never mention makes unless it's clearly mentioned on the machine.

Rotary phase converters are pricey. The step-up transformer and motor are the big cost. The rest of the bits for a basic rotary aren't that expensive. A few big capacitors, and either a time delay relay (or voltage sensitive relay if you want to get fancy) plus some wire and terminals are pretty cheap.

I used to have a link to a website that provided kits, including the option for electronic capacitor switching, but I can't currently find it. I was always tempted to upgrade my rotary with it, to eliminate all the relay/contactor chattering mine does when I start the milling machine up.

[sheffstaff]

Hi again do you think that a Rotary phase converter would be better than a digital phase invertor the problem is that they are all so pricey to be able to run the dual speed motor.

[scooterist007]

Very few actually make 380V. The HY ones DO NOT make 380V, they are listed as 220V and 380V input but do not upconvert. The Egogo (spelling) ones do but cost more. This seems to cheap for it to do the same ..... need true RMS meter and then see if it does, but dont be surprised if it does not.

Ok I did a search and the company your talking about is ecogoo, that's the only company that makes them, all the usual manufacturers ie Mitsubishi, Allen Bradley, Siemens etc do not make one, I don't see how they can make a true 220 single phase to 380 three phase, the only way I can see it happening is by converting it to DC and then chopping it to make the three phases and inverting it back to AC which would then be 220v three phase, then they would have to up the voltage to 380v, the only way to do that is generate the 220 supply, so that would mean using transformers, now some of the vfd's are saying they are for 20 odd kw, now to get that amount of power from a original 220v single phase supply they would have to use a big transformer! And the vfd's I see for sale are not that big, so I resort back to my original post that you can't get a 220v single phase to 380v three phase vfd that is a true accurate one

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[Voicecoil]

All these VFD's will be rectifying the AC input to DC, and then doing stuff with that to make the 3 phase O/P. For low power (and low cost) you can use a capacitor/diode voltage doubler on the input to generate ~650V DC, alternatively for larger power you can use a switchmode Power factor Corrector (PFC) stage to do the same and also keep you legal for harmonic currents. This will need just one (or a few) small decent inductors, if the switching frequency is high it's quite possible to get 3 KW through a couple of cores maybe 35 or 40mm across, larger powers pro-rata, so you don't need massive transformers.