Motor size

[Robin Hewitt]

The 220V is the max voltage and single phase is 230 but can peak up to 280V.
I suggest using an isolating transforma giving a max voltage of 110V.

It says 175VAC in your advert.

My knowlege of transformers is slight, but I do seem to remember they are wonderfully isolating, so it should be possible to wire several transformers in series so long as the windings can handle the extra current. (unless you can find a supplier for 175VAC kit).

Also, Amps :nope: 7.8 Amps at 175VAC is 1.3kW. Obviously you don't need transformers rated for that, the motor would melt. So how many VA do you actually need from the transformer to drive this beasty?

[Gary]

The PM2278, does not have a transformer inside and just rectifies the AC into DC, and pumps this into the driver.
So if you had 220V AC, this would be about 310V DC onto the driver and would burn most motors.
We say the 110V as a maximum because most motors are not designed to take such a high voltage.
Also the 7.8A is the phase current to the motor, and is not the current that the driver pulls from the transformer.
As a rule of thumb, if a driver is set to 7.8A, the actually pulled current will be about half.
You can use the 110V transformers that are used fro 110V power tools.
They are not that expensive.

It says 175VAC in your advert.

My knowlege of transformers is slight, but I do seem to remember they are wonderfully isolating, so it should be possible to wire several transformers in series so long as the windings can handle the extra current. (unless you can find a supplier for 175VAC kit).

Also, Amps :nope: 7.8 Amps at 175VAC is 1.3kW. Obviously you don't need transformers rated for that, the motor would melt. So how many VA do you actually need from the transformer to drive this beasty?

[tribbles]

You can use the 110V transformers that are used fro 110V power tools.
They are not that expensive.

That's what I used - a 3kW one from Screwfix Direct - it was about £68 from memory.

It officially isn't rated for 100% use, but I ran it for about 3 hours and it didn't get hot at all (37 deg.)



In fact, it says that you should run it for only 5 minutes every 20 minutes.

ETA: It runs all 3 of my motors (although now I've got a 4th to go in, I'll see how much hotter it gets).