Subject: Re: Higher loads on triac light dimmer ???
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Date: Tue, 17 Sep 2002 22:30:29 GMT
NNTP-Posting-Date: Tue, 17 Sep 2002 15:30:29 PDT
Organization: EarthLink Inc. -- http://www.EarthLink.net
Thanks Mike. A universal control from a stove top makes great sense.
"Mike Poulton" wrote in message
> On 17 Sep 2002, "elektrode" said:
> > "CS" wrote in message
> > news:LdIh9.431$L35.firstname.lastname@example.org...
> >> Hi, I'm moving a coffee machine from the USA 110V to Australia 220V
> >> which has a heating element rated at 1300W.
> >> Rather than using a bulky & expensive step down transformer, I would
> > prefer
> >> to use a standard thyristor light dimmer to control the heating
> >> element since it is just a resistive load, but every light dimmer
> >> I've seen is limited to about 600W.
> >> Is it possible to modify something to get this to work, like add a
> > heatsink
> >> to the 600W light dimmer ??
> >> Thanks.
> > Even if you found a dimmer with a high enough rating it would only
> > reduce the voltage, not increase it. Why don't you see if you can get
> > a new element rated at 220 volts for your machine? If not, scrap it
> > and start again. --
> > JohnS
> What? Read it again, John. He has a heater for 110V, and he wants to
> use it in 220. Therefore, he needs to divide the applied voltage by
> two! A triac circuit will work fine for this, although it doesn't
> really decrease the voltage. The best way to go is to use a "universal
> control" designed for 220V stove elements. These are cheap, made for
> 220V (can't use a 120V dimmer on 220!), and will easily handle the
> power. Check an appliance repair shop. Keep in mind that you will need
> to measure the power somehow, and a regular volt meter won't cut it --
> the waveform is totally funky. You could do it with a really good RMS
> meter, or with an oscilloscope and some fun math.
> Mike Poulton
> MTP Technologies
> Not only do I speak for my company, I AM my company!
> Live free or die!