I don't know for sure. I was told that the low-frequency emission
standards apply whether they are cited in a Generic or not. 61000-6-3
isn't restricted to 'residential, it includes 'commercial and light
industrial, which is why 61000-3-11 and -12 are cited. Maybe 61000-6-3
assumes a dedicated MV/LV transformer.
John Woodgate OOO-Own Opinions Only
J M Woodgate and Associates www.woodjohn.uk
Rayleigh, Essex UK
On 2017-10-11 19:28, Ralph McDiarmid wrote:
That is an interesting technical point. Notice that EN61000-6-3 (generic
residential) calls out 61000-3-2, -3, -11 and -12, but EN61000-6-4
(industrial) does not.
Presumably, EN61000-6-4 makes full provision for the apparatus ?
Ralph McDiarmid
Product Compliance
Engineering
Solar Business
Schneider Electric
From: John Woodgate [mailto:j...@woodjohn.uk]
Sent: Wednesday, October 11, 2017 10:10 AM
To: Ralph McDiarmid <ralph.mcdiar...@schneider-electric.com>;
EMC-PSTC@LISTSERV.IEEE.ORG
Subject: Re: [PSES] IEC 61000-3-2 Confusion
61000-3-2, -3, -11 and -12 do not have to be cited in the Generics; they apply
independently. 61000-3-4 assumes a dedicated MV/LV transformer, but the product
is only 3 kW, so one can't assume that.
John Woodgate OOO-Own Opinions Only
J M Woodgate and Associates http://www.woodjohn.uk
Rayleigh, Essex UK
On 2017-10-11 17:26, Ralph McDiarmid wrote:
I wonder if your customer's triac equipment falls under the EN61000-6-4 (EMC)
Emission standard for
industrial environments? I didn't see 61000-3-2 called out in that generic
standard.
Ralph McDiarmid
Product Compliance
Engineering
Solar Business
Schneider Electric
From: James Pawson (U3C) [mailto:ja...@unit3compliance.co.uk]
Sent: Wednesday, October 11, 2017 9:08 AM
To: mailto:EMC-PSTC@LISTSERV.IEEE.ORG
Subject: Re: [PSES] IEC 61000-3-2 Confusion
Hello John,
It uses phase angle control hence the concern about the harmonics generated.
Manufacturer specs are single phase, 230V nominal, 3kW.
Typically used at less than a 15% duty cycle, often less, in an industrial
environment or powered from a generator.
My *feeling* is that should be classified as professional equipment and
exempted under Clause 7 but the IEV has 0 search for feelings.
Thanks for your help
James
From: John Woodgate [mailto:j...@woodjohn.uk]
Sent: 11 October 2017 16:49
To: mailto:EMC-PSTC@LISTSERV.IEEE.ORG
Subject: Re: [PSES] IEC 61000-3-2 Confusion
I agree that there appears to be a need for clarification, and I will take that
up with the committee responsible. But for your particular case, what is
critical is the nature of the 'triac control'. Is it phase-angle control, or
'burst firing' or something else?
John Woodgate OOO-Own Opinions Only
J M Woodgate and Associates http://www.woodjohn.uk
Rayleigh, Essex UK
On 2017-10-11 15:01, James Pawson (U3C) wrote:
Hi folks,
I apologise as I seem to be all take and not much give on this forum at the moment; I'm trying to do a lot of learning very quickly. Someone ask a question about HDMI so that I can feel useful!
Today's question is what appears to be a contradiction in IEC 61000-3-2:2014.
. The customers equipment is a triac controlled high-power PSU for welding plastic parts together using resistance heater coils
. Power is over 1kW and the customer is suggesting that it is "professional equipment"
which, according to Clause 7, means that harmonic "limits are not specified in this
standard"
. Flowchart in Clause 7 says that Clause 6.1 for allowed control methods still
applies even to equipment with no limits
. Clause 6.1 says symmetrical control methods which produce large low order
harmonics (arguably this applies to triac control) that are used to power
heating elements (applicable) provided that either input power is less than
200W (it isn't) or the harmonic limits of Table 3 apply
. Clause 6.1 also says that symmetrical control for professional equipment is OK provided
one of the "above conditions" is fulfilled (which it is, see previous bullet)
So we've gone from Clause 7 saying no limits apply to Clause 6 saying that Class D equipment limits apply.
However the flowchart in Clause 7 suggests that just by being exempt from
Clause 7 limits means it automatically conforms to 61000-3-2
I feel like I'm going in circles. Does anyone have any insight that might help?
Much appreciated,
James
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