Tom Senior mill`s ?? any good.

[W.olly]

Why? It does involve dismantling and finding the star point, but it then becomes a 240v delta wired motor. You don't lose any of the little power that you have from it.

i was goggling how to do it and i read that its has to be 240v 3ph to rewire to 240v single.

i keep looking for a wiring diagram then if it can be done. it will make it a lot easier. i wonder now why nobody mentiond it when i ended getting a VFD for the late as folk said tats the easiest way to go. .

 

[Seadog]

No, if it's 425v star then you can configure it for 240v delta and run it from a cheapo VFD. A much, much better arrangement.

 

[W.olly]

No, if it's 425v star then you can configure it for 240v delta and run it from a cheapo VFD. A much, much better arrangement.

i will go with that then if i can find how to rewire it. the Transwave are costly at the minute and dont want to be waiting for months to get one to run the mill.

cheers kida

 

[Richiew]

An AT4 VFD works. They are 220 input 380 output. I have one my mill. My motor like yours is wired star only unless you want to get brave and start fiddling with the star points.

Einphasige Variable AT4-1500X Für Motordrehzahlregler Für VFD 1 Langlebig | eBay

Find many great new & used options and get the best deals for Einphasige Variable AT4-1500X Für Motordrehzahlregler Für VFD 1 Langlebig at the best online prices at eBay! Free delivery for many products.

www.ebay.co.uk

 

[Shox Dr]

if there are 6 wires in the connector block; happy days. if not open it up and look for a bulge or bulges in the outer windings. open the wrap and you will find your 3 pair

 

[Agroshield]

An AT4 VFD works. They are 220 input 380 output. I have one my mill.

Please could you look at this one: https://www.ebay.co.uk/itm/224273979322 and advise. I think it is cheaper and higher capacity (so more headroom between the fictitious claimed output and the machine's real demand).

 

[W.olly]

if there are 6 wires in the connector block; happy days. if not open it up and look for a bulge or bulges in the outer windings. open the wrap and you will find your 3 pair

its three wires.

but just found this, seems to easy .......???

 

[Seadog]

The problem with a capacitor is that it's not true 3-phase, it de-rates the already weedy motor, and introduces harmonics in the rotation which can affect surface finish.

 

[W.olly]

An AT4 VFD works. They are 220 input 380 output. I have one my mill. My motor like yours is wired star only unless you want to get brave and start fiddling with the star points.

Einphasige Variable AT4-1500X Für Motordrehzahlregler Für VFD 1 Langlebig | eBay

Find many great new & used options and get the best deals for Einphasige Variable AT4-1500X Für Motordrehzahlregler Für VFD 1 Langlebig at the best online prices at eBay! Free delivery for many products.

www.ebay.co.uk

i will need a 415v one though, but not bad.

 

[Richiew]

@Agroshield That's the same series so the same, bar the supposed power output. It would be fine.

AT1 is 220 single to 220 three phase.
AT2 is 220 single to 220 single phase.
AT3 is 380 three phase to 380 three phase.
AT4 is 220 single to 380 three phase which is the one to have in Wolly's situation.

Manual here to confirm.

http://myosuploads3.banggood.com/products/20190919/20190919015909SKU792664.pdf

Shop around for the AT4. I paid 96 euros in 2020 from an Italian seller on ebay for the 1.5kw version

 

[Seadog]

A 380v one will work OK.

 

[W.olly]

The problem with a capacitor is that it's not true 3-phase, it de-rates the already weedy motor, and introduces harmonics in the rotation which can affect surface finish.

Ok, thats out the window. i have found a Transadrive and hope its going cheap, waiting for a reply. 3kw one.

 

[W.olly]

@Agroshield That's the same series so the same, bar the supposed power output. It would be fine.

AT1 is 220 single to 220 three phase.
AT2 is 220 single to 220 single phase.
AT3 is 380 three phase to 380 three phase.
AT4 is 220 single to 380 three phase which is the one to have in Wolly's situation.

Manual here to confirm.

http://myosuploads3.banggood.com/products/20190919/20190919015909SKU792664.pdf

Shop around for the AT4. I paid 96 euros in 2020 from an Italian seller on ebay for the 1.5kw version

A 380v one will work OK.

So chaps, the AT4 VFD will do the job even th its a 415v motor and the VFD is 380v. al tis is over my ead and tired now, i will buy one now if its going to do the job properly. unless i can get the Transdrive for same maybe better price, that will be better yes ?

one of these

VEVOR 4KW 220V 5HP Variable Frequency Drive Inverter VFD VSD 3 Phase Output CE | eBay

Why Choose VEVOR?. The input for this VFD is 1 or 3 phase, and the output is 3 phase. The spindle VFD is equipped with fan cooling and a built-in radiator. It has an efficient heat dissipation ability, ensuring a suitable temperature inside the VFD.

www.ebay.co.uk

.https://www.ebay.co.uk/itm/224273979322

or

TRANSWAVE Static Converter 3kw - Single to 3-phase 240v to 415v old little used | eBay

It seems to work but I have no way of testing it . model no L13584STC.

www.ebay.co.uk

 

[Richiew]

That Vevor is no good. Still 220V output voltage.

 

[Richiew]

My simple understanding of 380 and 415v three phase is it works in the same way 220/240volts does on domestic supplies. Effectively the same voltage within an allowable range.

 

[W.olly]

oops linked to wromg one

 

[Wedg1e]

I picked up a TECO VFD, 240v 1-phase in, 415V 3-phase out, for £250 secondhand (it was months old at the time and Drives Direct sold them for £400).
Worth every penny for (a) the saving in bu993ring about with my Boxford and (b) I can use it to drive other equipment, which also then needs no bu993ring about - it's rated for 3HP I think.
Once you have one, you effectively have a (admittedly restricted) 3-phase supply in your workshop - far cheaper than asking the electricity board to pull a couple of extra cores in and hang a new meter off the end (and someone told me they apply 3 lots of standing charge, dunno how true that is as my ex had 3-ph in her workshop and the bills weren't that bad).

 

[Agroshield]

...415v motor and the VFD is 380v.

Do not worry about the apparent difference in voltage.

In the UK, in the past, we have traditionally had a 240v suppply. Two hundred and forty multiplied by the square root of three gives four hundred and fifteen. That is why motors from UK suppliers have that number on them.

In Europe, they generally supply the voltage at 220v. Two hundred and twenty multiplied by the square root of three gives three hundred and eighty. European motors thus have 380v on them.

Right now, as everything is harmonised, the actual voltage is about 230v (so when you do the multiplication, you get 400v). We turned ours down to gas mark 8 1/2, the French had to throw a bit more uranium into the microwave. The tolerance on supply voltage is generally plus or minus 10% so 220-230-240 and the equivalent three phase numbers are all OK.

 

[Wedg1e]

This is the one I have... prices have gone up a bit

Pardon our interruption...

 

[Scalarocco]

"Ow much?!"