RE: [CAD_CAM_EDM_DRO] Re: ELCB Issues

Hi Lester

What make inverter did you find that is good to use after an ELCB.

I've fitted loads of VFD's or all sorts of makes and never found one yet
that will keep a 100mA ELCB in.



Dr. Mark Vaughan Ph'D. B.Eng. M0VAU

Managing Director

Vaughan Industries Ltd, reg in UK no 2561068

Water Care Technology Ltd, reg in UK no 4129351

Addr Unit3, Sydney House, Blackwater, Truro, Cornwall, TR4 8HH, UK.
Phone/Fax 44 1872 561288

_____

From: CAD_CAM_EDM_DRO@yahoogroups.com
[mailto:CAD_CAM_EDM_DRO@yahoogroups.com] On Behalf Of Lester Caine
Sent: 18 March 2007 20:49
To: CAD_CAM_EDM_DRO@yahoogroups.com
Subject: Re: [CAD_CAM_EDM_DRO] Re: ELCB Issues



xj5373 wrote:

> Thanks for this.
>
> I guess the thing that bothers me is that once the machine is up and
> running, like this morning for example, everything works normally and
> the trip stays in. So it seems that in normal circumstances there is
> no imbalance between live and neutral, it seems to be something that
> happens just when the charge pump relay powers up the inverter and
> the stepper power supply, hence my suggestion of some kind of
> transient.
>
> Once powered up the Inverter (spindle) can be switched on and off
> with no ill effects, the steppers similarly work without problems.

Filter caps connected to earth causing a problem? Hence the point about
checking WHAT is connected to the earth line. I have an nice EMC test set
that
does cause a problem with it's caps, so it has a large isolating transformer

in front. The inverter I've been playing with does not give any trouble and
has been designed to be used after an ELCB, so that may be the problem.

--
Lester Caine - G8HFL
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