RE: [CAD_CAM_EDM_DRO] Re: ELCB Issues

Hi Steve.

Your poor earth is probably why your Jaguar drives aren't tripping anything,
no where for the leakage current to go.

I have also come across Jaguar drives that put out an awful lot of RFI noise
typically on XYZ Proturn lathes, some are filtered, some are not but there
is something they are missing on these machines. The same drives are used on
their mill spindles and these seem much cleaner.

I use Jaguar drives on all my surf board pouring machines, we used to use
Siemens, but every time we built a new machine they released a new drive and
all the modbus software needed to be re written, also Siemens have a few
mistakes when it comes to the motor voltage for low RPM use, they linearly
derate it to zero volts at zero RPM and you need an offset which they don't
provide. You trick the software by telling it it is connected to a motor of
higher voltage, at full speed it cannot generate any more voltage, but as
you slow it, you then get enough to keep some torque.



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 Steve Blackmore
Sent: 19 March 2007 01:27
To: CAD_CAM_EDM_DRO@yahoogroups.com
Subject: Re: [CAD_CAM_EDM_DRO] Re: ELCB Issues

On Sun, 18 Mar 2007 21:24:57 -0000, you 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.

I've two IMO Jaguar inverters that don't trip a 100mA ELCB here under
"normal" circumstances. I can force a trip by powering everything in the
shop up, lathe, mill, grinder, heater, mig and tig welders. Which ever
one is that is turned on last out of the list, will trip it. Both IMO's
have filters on the input.

Under normal circumstances, I never have the mill and lathe running at
the same time, and never get a trip. I often weld and run a CNC machine.

Just to add to the confusion, I've also got a crap Earth and often get
100V+ Neutral to Earth.


Steve Blackmore
--





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