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Standard Dimmer ahead of Low Voltage Transformer OK or not? #52667 06/02/05 02:11 AM
Joined: Mar 2004
Posts: 32
C
CalSparky Offline OP
Member
I've seen similar threads on this one and can't find them using the search engine to save my life.
Anyhoo, have any of you out there had success with using a 120V standard dimmer feeding a low voltage transformer for interior low voltage lighting (in my case, a residential kitchen with the cabinets lit from underneath). I hooked this up and it appears to work fine (seems like the other threads had plenty of supporters of this technique). The only thing that gets me is that if the dimmers use a "clipping" action (sine wave clipping), what does that do to a transformer? Arn't you in essence feeding it DC at the clipped points? If thats the case, heat would be an issue right(as in a dead short in the trasformer -- can we say wires melting, heat, fire department [Linked Image] )??

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Re: Standard Dimmer ahead of Low Voltage Transformer OK or not? #52668 06/02/05 02:28 AM
Joined: Mar 2004
Posts: 32
C
CalSparky Offline OP
Member
Here is an interesting note from the datasheet on the dimmer that I just found from Lutron's site which notes that magnetic transformers need be used to feed transformer based systems (note that I'm using the Ariadni style dimmer):

Important Notes
1. CAUTION: Use "AY-" or "TG-" models only with permanentlyinstalled
120V incandescent or halogen fixtures. To avoid
overheating and possible damage to other equipment, do not use
to control receptacles, fluorescent lighting fixtures, motor-driven
appliances, or transformer-supplied appliances. Use "AYLV-"
models only with core and coil (magnetic) low-voltage
transformers. To control solid state (electronic) low-voltage
transformers, use Lutron electronic low-voltage dimmers.

Re: Standard Dimmer ahead of Low Voltage Transformer OK or not? #52669 06/02/05 06:16 PM
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e57 Offline
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