I should also have asked what the rated power actually is, and whether
it's 1-phase or 3-phase?
John Woodgate OOO-Own Opinions Only
J M Woodgate and Associates www.woodjohn.uk
Rayleigh, Essex UK
On 2017-10-11 16:54, John Woodgate wrote:
True, but it's a cumbersome procedure and is not clearly enough
indicated. I will try to get an improvement.
John Woodgate OOO-Own Opinions Only
J M Woodgate and Associateswww.woodjohn.uk
Rayleigh, Essex UK
On 2017-10-11 15:59, Scott Aldous wrote:
Hi James,
The flowchart in Clause 7 in the version of the standard that I have
access to sends you to Clause 4 for professional equipment that uses
techniques not allowed by 6.1. The second paragraph of Clause 4
addresses professional equipment that does not comply with the
requirements of the standard, mentioning that the instruction manual
must indicate to ask the supply utility for permission to connect
and that additional recommendations can be found in IEC/TR 61000-3-4
or IEC 61000-3-12.
On Wed, Oct 11, 2017 at 7:01 AM, James Pawson (U3C)
<ja...@unit3compliance.co.uk <mailto:ja...@unit3compliance.co.uk>> 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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