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VFD article in MEW 251

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Carl Wilson 401/02/2017 12:32:42
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I've been reading the article by Mr. Laurie Leonards in MEW 251 regarding porting his VFD between different machines.

A good idea I think, and something I could use myself. I was wondering how the requirement for emergency stops were incorporated in this system. Can the author enlighten me please?

Carl.
fishy-steve01/02/2017 12:43:54
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I haven't got access to the article but wouldn't the pendant move from machine to machine too?

The only problems I can think of would be that unless your motors were the same you would need to tweak the parameters from machine to machine

I'm sure the manual that came with my VSD states it's not recommended to fit a plug anywhere in the 3 phase supply line though.

Steve.

Carl Wilson 401/02/2017 12:46:39
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Yes the pendant moves. But the pendant does not have an emergency stop on it. The author has used the same motor type on both his lathe and Mill hence inverter parameters don't need to be altered.
Carl Wilson 401/02/2017 12:49:27
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I think those Jaguar IMO inverters have a pair of low voltage terminals that require continuity before the unit will work.

So I'm tentatively thinking here that the interlocks and E stop on the machine could be wired in series to these terminals.

Carl.
JasonB01/02/2017 12:56:14
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Would a Myford and Tom Senior even have any additional e-stops ?

fishy-steve01/02/2017 13:28:22
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I've set my stop button to coast to a stand still on my Boxford AUD. When setting up the E-stoppel I obviously wanted the chuck to come to a stop much faster. Not a good idea to set it much less than .8 of a second.

Oh was I glad I had a 1" x 8" piece of brass in the chuck. 😉

Neil Wyatt01/02/2017 13:34:47
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The Jaguar inverters can be programmed to accept both NO and NC switches for control functions. See www.model-engineer.co.uk/news/article/3-phase-conversion-and-other-alternative-methods-of-powering-a-mini-lathe for how I wired up mine.

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