Thank you Bill. We appreciate companies with solutions offering their wares to our members. Once. You have now done that.
Barry Young
Group Owner.
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On Sat, 3/12/16, Bill Rubenstein bill.r@stubbylatheusa.com [GrizHFMinimill] <GrizHFMinimill@yahoogroups.com> wrote:
Subject: Re: [GrizHFMinimill] tripping circuit breakers
To: GrizHFMinimill@yahoogroups.com
Date: Saturday, March 12, 2016, 11:36 AM
Why I have some emi filters...
For some years I imported a high-end, very nice
woodworking lathe.
I imported it bare -- supplied stands, motors,
electronics here. I
bought and sold hundreds of Eaton 2hp MVX VFDs. They
were
spectacularly good, bullet-proof, sensorless vector,...,
-- great
drives. They did not, though, have a built-in filter
so I used an
external filter. It was sold by Eaton but was actually
a Delta (the
vfd company) filter. I'd still be using that drive
except that it
went out of manufacture about 3 years ago. Eaton has
had several
lines of micro-drives since then but they all suck,
imho. I'm
currently using the Hitachi WJ200 which is a very good
drive. I've
tested a bunch and many suck in various ways.
Woodturners need
low-end torque. While the Stubby (www.stubbylatheusa.com)
is no
longer readily available in the US, we are about to
start
manufacture of a new lathe (US) -- the Praxis.
Anyway, I have 3 filters not sold because of various
reasons. As I
recall two have cases which have some damage not
affecting anything
meaningful. The third -- I think I may have used it
for a demo
machine or whatever.
My pricing from Eaton was via a special agreement due to
the volume
of drives I was buying. I'm also happy to say that
Eaton support
came to respect my knowledge of that drive and my
opinions on
several of their subsequent offerings.
I'd sell each for $45.00 + shipping. That's
about what I paid for
them.
Bill
On 03/11/2016
10:17 AM,
mark.kimball2@frontier.com
[GrizHFMinimill] wrote:
If you have not done so already, you should
take
advantage of Bill's offer to send you a
line filter. I
know that the PWM motor controllers generate a
lot of EMI,
based on my experience with putting DRO's
on my mill. It
took some good shielding braid to keep the
noise from
messing up the readouts. An arc-sensitive
breaker could
well interpret the EMI as something dangerous
and open
up. $45 is a very reasonable price. As a
matter of fact,
Bill, where did you get that one -- it's
something I want
to consider, too.
As to why other apparently-unrelated circuits
could be
affected, the EMI also may be coupling into
them via stray
inductance. All it would take is to have the
noisy line
run in parallel with another one for some
distance, and
you've got a transformer, especially for
noise "spikes".
Shielding is not particularly effective for
noise created
by current spikes so metal-sheathed coax can
be
susceptible to this as well.
In a situation like this, I would not mess
with ad-hoc
fixes like moving connections around in your
breaker box.
One small variation down the road could make
the problem
come back. Take care of the problem at the
source, and
you've solved it for once & for all.
Mark
------------------------------------
Posted by: Barry Young <barryjyoung@yahoo.com>
------------------------------------
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