Interesting discussion.
The lack of prior experience with equipment such as this
industrial cut-off saw seems to come from folks who do not regularly work
with machinery and the Machinery Directive.
Having done some of this type of certification work it's
clear that the machinery manufacturers want to avoid EMC testing at all
costs. They either look at taking advantage of an allowance for large,
permanently installed machinery which allows for no EMC testing under
certain specified installation conditions or just claim compliance based
upon the VFD manufacturers data sheet which usually claims EU compliance
when the appropriate, stated filters are installed.
In this case, I would expect the component saw mfgr to have
done the needed EMC testing and specify appropriate filtering to be used to
show compliance. Maybe this is what you are helping with in this case, it's
not clear.
Oh yes, I remember one situation what filters were
stipulated by the VFD/motor manufacturer and asked if they were installed.
The response was we installed the input filters (the cheaper ones) but not
the output filters (more expensive). A quick calculation showed that it was
still cheaper to install the 3 dozen or so output filters than hire the EMC
testers to come on-site and provide a compliance report to cover this
aspect. Some chagrin was shown, they had not expected to spend U$ 10k or so
in either case.
So, I'm not surprised at the problem; getting to the proper
result will be the demonstration of Brian's magical professional ability
(smile a lot while you put it to them).
:>) br, Pete
Peter E Perkins, PE
Principal Product Safety Engineer
PO Box 23427
Tigard, ORe 97281-3427
503/452-1201 fone/fax
p.perk...@ieee.org
_ _ _ _ _
From: Kunde, Brian [ <mailto:brian_ku...@lecotc.com>
mailto:brian_ku...@lecotc.com]
Sent: Monday, February 02, 2015 5:12 PM
To: <mailto:EMC-PSTC@LISTSERV.IEEE.ORG> EMC-PSTC@LISTSERV.IEEE.ORG
Subject: [PSES] EMC on Industrial Cut-Off Saws
I am not at all familiar with this category of products so please excuse my
ignorance which is an industrial cut-off saw with a 5hp electric motor for
cutting steel rods, and such.
Most of these basic model saws have no high frequency devices and brushless
AC motors so they do not generate EMI. However, the more expensive models
have Inverters (Frequency Drives) to slow start/stop the motor and act as a
break.
We evaluated a saw from a company who says they do not require EMC testing
on their saws even when they use the Inverter, as long as they follow the
installation instructions from the inverter manufacturer (yea, I just about
fell out of my chair). We tested one of these saws and failed CISPR 11 Class
A Conducted Emissions by 50db (if was a prototype saw not on the market).
How do these people sleep at night?
So here is my question. Does the US and Canada require Emissions testing on
Industrial Saws? Same question for Europe. I assume EN 55011 Class A is
mandatory in Europe on such a devices.
Please confirm (sanity check).
Thanks,
The Other Brian
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