Advice on inverter/convertor

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Mike cole - 11 Dec 2006 15:09 GMT

Hi guys
I have just bought a secondhand Chester Lux mill fitted with a 3 phase
motor. This is fitted with a inverter and gives variable speed. I am
just about to buy a Boxford AUD mk111 fitted with a 3 phase motor this
being fitted with a Transwave converter. This setup does not give a
variable to the lathe the owner changing belts as normal. Given that I
will only run one machine at the same time cound I use the inverter
that I have to run both mill and lathe ( also to get variable speed on
the lathe as well) or will I have to buy the transwave contverter as
well. He wants £250 just for the converter, which I think is too
much, and in this would I be able to get variable speed out of it.
Sorry for lack of information on the motors and invertor/convertor but
the machines are in storage at the moment.

Mike Cole

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Colin Wildgust - 10 Dec 2006 12:33 GMT

Hello mike the converter does sound a bit expensive unless it is a rotary
converter but then for the size of the motor needed to run a boxford lathe I
would think you could pick an inverter up very resonable off the shelf or
Ebay. Colin

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NoSpam - 11 Dec 2006 16:03 GMT

> Hi guys
> I have just bought a secondhand Chester Lux mill fitted with a 3 phase
[quoted text clipped - 11 lines]
>
> Mike Cole

Yes in principle (one at a time), providing:
- the inverter is rated for the lathe motor
- the lathe motor can be re-wired to delta configuration
- the coolant pump can be re-wired to delta and you know how to add a
capacitor to make it run from single phase
- you can re-wire the lathe controls (and the light) for 230V.

Also, you should really have an interlock to prevent disconnecting a
motor from the inverter with power on the inverter input; supposedly
they don't like it very much.

All fairly straightforward if the motor has 6 terminals and you're
comfortable sorting-out the wiring. I did this a while ago on a BUD, the
coolant pump only had 3 terminals so I had to dismantle it to find the
star point - a bit like neurosurgery but it worked-out OK.

Dave

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Model Forum / General / Models / December 2006

Advice on inverter/convertor