Re: VFD's / Skates

--- In CAD_CAM_EDM_DRO@y..., "johnhe" <johnhe@s...> wrote:

> > Let me check and get back to you tomorrow but I think I have a 4

Hp

> > VFD kicking around spare.
>
> Thanks. I phoned Yaskawa and asked for a:
> 1.5kW triple phase, 500 - 3000rpm, single phase in, VFD.
> They called back and mentioned a few things like that running it at

low end

> speeds around 500rpm would heat the motor over time which'd short

the

> inverter or knock it out so I should fit a fan to the top (I

instantly

> ignored their own personal kit idea, I'm not paying £400 for a

plastic fan

> put on by someone else). What else, the motor would need to be

wired in

> Delta Star as opposed to Star. The inverter came to a pretty

awesome £371,

> or $540 (On 4 pole putting out 100hz to get to 2880rpm). If you

have a

> inverter that'd do John I'd still be interested but otherwise can I

not just

> use a static phase converter and a step up transformer after it?

There are

> belts on the machine, I'm not sure I need a £200 button to change

speeds.

> The man said the inverter would be for 230v so I'd need to put the

step up

> on that as well, but I'm not buying it I don't think.
>
> Regards,
> John He

John,
Somebody is pulling your plonker. A 1.5Kw Yaskawa invertor RETAILS
for £280 and it has a fan already built in. I know I buy loads of
these, In fact I'm an agent in the sense of getting a good discount.
You really need to do your homework though. 1.5 Kw is 2 Hp, if the
motor on the mill is bigger than this then it's no use. You have to
match the motor to the invertor.
I had a look tonight and the invertor I have spare is a 2.2 KW model
but it's 3 phase in so by the time it's been derated for single phase
use it will be too low.
I can offer you a 2.2kw single phase input unit, brand spanking new,
latest model, not a last years clearout complete with programming
panel and filters for £300