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 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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