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Motion detectors and dimmers #219649
09/20/18 01:24 PM
09/20/18 01:24 PM
G
gfretwell  Offline
OP
Member
Joined: Jul 2004
Posts: 9,325
Estero,Fl,usa
Have you guys had problems with dimmers on motion detectors (dimmer in the load path). The lights don't even glow.
I can make the dimmer work and I can make the motion detector work but not together. I have tried 4 different types of dimmer and 2 motion detectors. The MD is turning on and I see 120 at the dimmer, it just does not put out. I swapped in and out on the dimmer. Still no joy. They are light bulbs Tom Edison would recognize so that isn't it.


Greg Fretwell
Work Gear for Electricians and the Trades
Re: Motion detectors and dimmers [Re: gfretwell] #219650
09/20/18 01:52 PM
09/20/18 01:52 PM
G
geoff in UK  Offline
Member
Joined: Dec 2002
Posts: 194
UK
I'm guessing your motion detector has a solid state relay type output.
Both devices are probably designed to work with a sinusoidal input and a resistive load.
The MD won't "see" a load when it tries to switch on, and /or the dimmer won't see an appropriate supply to trigger its electronics.

Perhaps a motion detector with an old fashioned mechanical relay would solve your problem.

I've not tried your setup, but the incompatibility of some dimmers with some led or cfl lights is well known and similar

Re: Motion detectors and dimmers [Re: gfretwell] #219651
09/20/18 03:02 PM
09/20/18 03:02 PM
G
gfretwell  Offline
OP
Member
Joined: Jul 2004
Posts: 9,325
Estero,Fl,usa
I wired a bulb in directly to the MD and everything seems to work. Thanks. I really thought these Heith dimmers were relay output tho. The others I have click. I guess this is just progress.


Greg Fretwell

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