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RE: Inductive Load Dimming


  • To: <ukha_d@xxxxxxx>
  • Subject: RE: Inductive Load Dimming
  • From: "Dr John Tankard" <john@xxxxxxx>
  • Date: Wed, 14 Feb 2001 15:32:02 -0000
  • Delivered-to: rich@xxxxxxx
  • Delivered-to: mailing list ukha_d@xxxxxxx
  • Mailing-list: list ukha_d@xxxxxxx; contact ukha_d-owner@xxxxxxx
  • Reply-to: ukha_d@xxxxxxx


>As mentioned above I avoided the switched mode ps for lighting,
> main question is do the din rail modules (LD10/11) handle
>inductive loads?  I have three transformers on lights 100/200/300VA
Torodial type.

Torodial transformers do not like dimming using TRIAC's
see reply below

"No, the normal torroidal transformers should not be used for dimming
with
standard dimmers. The reason is that most dimmers chop up the normal
waveform using a triac or diac and they do not provide symmetrical outputs
on the +ve and -ve half cycles, this saturates the transformer core. This
could result in either the destruction of the transformer or a fuse.

You need to check with the manufacturer to see if the output is
symmetrical,
most using microcrontrolers _should_ be ok, if the code is correct.

John
jtankard@xxxxxxx"




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