RE: [CAD_CAM_EDM_DRO] Re: ELCB Issues

Most only recommend a line reactor based on the size of the available
supply, I think if it's above something like 100KVA, most of us can't draw
this.

The line reactor reduces the rapid current inrush which stops MCB's from
tripping, but doesn't effect the ELCB's, according to the manufacturers,
though slowing the inrush might reduce the transient the filter caps are
dumping to earth. Line reactors are also quite lossy.



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 Harko Schwartz
Sent: 19 March 2007 03:57
To: CAD_CAM_EDM_DRO@yahoogroups.com
Subject: Re: [CAD_CAM_EDM_DRO] Re: ELCB Issues



all of those drives recommend a line reactor. There are also other
considerations like keeping signal lines away from power lines both from the
input of the inverters and the output just the same for the servo
controllers. Most of the newer systems use high frequencies like 40 khz and
the harmonics they create are a problem. There is also the other
consideration that the motors capacitance leaks those frequencies to
ground. If a motor is not connected to the frame and is moving it should
have a positive ground wire connected to it to the machine frame.

Harko

On 3/18/07, Mark Vaughan <mark@.... <mailto:mark%40vil.uk.com> com>
wrote:

>
> Trouble is we have no other choice but to use an EMC filter.
>
> I have used a lot of Jaguar, Omron and Siemens inverters with and without
> EMC filters, and for me they still tripped a 100mA ELCB with or without
> the
> filter.
>
> These were all new. We used to just have a spare supply on it's own ELCB
> just for testing the inverters so it wouldn't knock all the rest of the
> factory out.
>
> 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_ <mailto:CAD_CAM_EDM_DRO%40yahoogroups.com>

DRO@yahoogroups.com <CAD_CAM_EDM_DRO%40yahoogroups.com>

> [mailto:CAD_CAM_EDM_ <mailto:CAD_CAM_EDM_DRO%40yahoogroups.com>

DRO@yahoogroups.com<CAD_CAM_EDM_DRO%40yahoogroups.com>]

> On Behalf Of Wayne Weedon
> Sent: 18 March 2007 21:18
> To: CAD_CAM_EDM_ <mailto:CAD_CAM_EDM_DRO%40yahoogroups.com>

DRO@yahoogroups.com <CAD_CAM_EDM_DRO%40yahoogroups.com>

> Subject: Re: [CAD_CAM_EDM_DRO] Re: ELCB Issues
>
> Mark Vaughan wrote:
>
> > 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.
>
> Possibly one without an inbuilt EMC filter ;) Once fitted an inline
> filter to an OLD Jaguar Cub inverter, that was enough to cause tripping.
> Before it was OK.
>
> Wayne....
>
> --
> ----------------------------------------------------------
> Wayne M Weedon Email: wayne@fdos-design. <mailto:wayne% <wayne%25>
> 40fdos-design.com>
> com
> Fdos Design Poole UK
> Tel +44-1202-677025 Fax +44-1202-770515 Mobile: 07774 439915
>
> Specialists in small batch & Production Mechanical/Electrical Engineering
> ----------------------------------------------------------
>
> [Non-text portions of this message have been removed]
>
>
>

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