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Date

06-04-2008

Posted by David Littlewood on June 4, 2008, 6:07 pm

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In view of my cack-handed wrecking of my S7 motor (see separate thread),
I am looking at a potential excuse to spend some cash on a 3-phase motor
and inverter drive. Always liked the potential for speed control, good
torque at low speeds, smoother running etc and was toying with such an
upgrade anyway.

I have looked at the advertisers in ME; I quite liked the look of the
Newton Tesla package for the S7. Anyone out there got any comments on
these or other competing versions? Do I need the 1 HP or will the 1/2 HP
do? (The price difference is pretty small so I'd instinctively go for
the 1 HP). Anything else I need to think about?

David
--
David Littlewood

Posted by Mark Rand on June 4, 2008, 6:42 pm

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wrote:

>
>I have looked at the advertisers in ME; I quite liked the look of the
>Newton Tesla package for the S7. Anyone out there got any comments on
>these or other competing versions? Do I need the 1 HP or will the 1/2 HP
>do? (The price difference is pretty small so I'd instinctively go for
>the 1 HP). Anything else I need to think about?
>
>David

I would suggest seeing what young master Oseman has got for 1hp invertors on
Charles&John's site and Ebay for a 3/4hp 4 pole motor. rswww.com for switches
and variable resistor. The Newton Tesla drives are expensive bulky and ugly
IMHO.

Mark Rand
RTFM

Posted by David Littlewood on June 4, 2008, 8:09 pm

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>wrote:
>
>

>>
>>I have looked at the advertisers in ME; I quite liked the look of the
>>Newton Tesla package for the S7. Anyone out there got any comments on
>>these or other competing versions? Do I need the 1 HP or will the 1/2 HP
>>do? (The price difference is pretty small so I'd instinctively go for
>>the 1 HP). Anything else I need to think about?
>>
>>David

>
>
>I would suggest seeing what young master Oseman has got for 1hp invertors on
>Charles&John's site and Ebay for a 3/4hp 4 pole motor. rswww.com for switches
>and variable resistor. The Newton Tesla drives are expensive bulky and ugly
>IMHO.
>

Thanks Mark. Can see they are significantly more expensive than
alternatives, but they don't seem (to me) to look much worse than most
workshop stuff.

David
--
David Littlewood

Posted by Mark Rand on June 5, 2008, 1:51 pm

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wrote:

>Thanks Mark. Can see they are significantly more expensive than
>alternatives, but they don't seem (to me) to look much worse than most
>workshop stuff.
>
>David

I'm just not keen on the great big boxes sticking out to catch you as you walk
past.

Here are my first and second ML7s:-

http://www.test-net.com/inverters.html

On the first one, the Dewhurst reversing switch was used as an isolator and
for the forward/reverse control. The second one doesn't have a built in
isolator.

Mark Rand
RTFM

Posted by Tony Jeffree on June 5, 2008, 2:16 pm

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On Thu, 05 Jun 2008 18:51:14 +0100, Mark Rand

>wrote:
>
>

>>Thanks Mark. Can see they are significantly more expensive than
>>alternatives, but they don't seem (to me) to look much worse than most
>>workshop stuff.
>>
>>David

>
>
>I'm just not keen on the great big boxes sticking out to catch you as you walk
>past.
>
>Here are my first and second ML7s:-
>
>
>http://www.test-net.com/inverters.html
>
>On the first one, the Dewhurst reversing switch was used as an isolator and
>for the forward/reverse control. The second one doesn't have a built in
>isolator.
>
>Mark Rand
>RTFM

Neat.

The big sticking out box problem is more theoretical than real, having
lived with mine for a few years now, but your solution is definitely
tidyer.

Regards,
Tony

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