Just installed 10 lv 50w lights on a 300w double dimmer. have used
"intellegent" 105w transformers (marked as dimmable) for each pair of
lights. When lights are full on everything is fine - however once
dimmed all lights start buzzing. what can i do to stop this buzzing.
Many thanks in advance
Dimmers work by triggering the turning on and off of the AC sharply at
a certain stages in the sinewave. Which is why they cannot be used with
normal inductive transformers. The sharp switching can cause buzzing
noises, but how much will depend upon the dimmer which you have matched
to the 'transformer' units. You didn't say whether you purchased both
dimmer and 'transformers' from the same supplier, if you did and the
noise is not acceptable, then it might be worth talking to the
10 * 50W = 500W
You have two 300W dimmers. How have you arranged the lights? 200W +
300W? Most dimmers need to be derated for halogen or LV lighting - check
the instructions which came with your dimmer switch. I suspect you are
overloading one or both of the dimmer switches. Even if not, I'd be wary
of running a 300W dimmer with a 300W load, especially an LV load.
The more load you have on a dimmer, the more it tends to buzz, and the
solution is to fit a (much) higher capacity dimmer than you think you
need. Unfortunately, as another thread has discussed in the last few
days, two-gang dimmers of >300W capacity are rather difficult to obtain.
Martin Angove: http://www.tridwr.demon.co.uk /
Two free issues: http://www.livtech.co.uk/ Living With Technology
HomeOwnersHub.com is a website for homeowners and building and maintenance pros. It is not affiliated with any of the manufacturers or service providers discussed here.
All logos and trade names are the property of their respective owners.