Flashing LEDs when fan and lights off

[Mike Johnson]

@clanky boy notwithstanding any of the last four pages, somewhere you have a Ghost voltage on your supply to these lights, this can be caused by many different reasons, but usually its a two way switch somewhere on the loop with an induced voltage between the two switch's, a clean supply or snubber/snubbers are the only way to cure the problem IMO.

 

[clanky boy]

The 47nf is maybe a little low. I think 100nF (0.1uF) or more with say 120 ohms in series is the usual sort of thing.
There have been threads on this forum before about this.

This has been a suggestion before:

PMR209ME6220M470R30 | KEMET RC Capacitor 220nF 470Ω Tolerance ±20% 250 V ac, 630 V dc 1-way Through Hole PMR209 Series | RS

uk.rs-online.com

You may still need more than one!

I have ordered a few 150nF and I'll try that - if no joy I'm off to tie a noose!!!
Thank you everyone for the help and advice - if the new snubbers don't work I'll pick this up again.

 

[clanky boy]

I use these from RS Components:

View attachment 109812

That is a nice tidy setup - I will try these if what I have ordered doesn't work.
Thank you.

 

[Mike Johnson]

@clanky boy any news?

 

[clanky boy]

@clanky boy any news?

Not yet Mike. The snubbers arrived Fri and not had a chance to fit them yet. When I do I'll post the outcome- it's always nice to close a problem down and not leave it open ended

 

[clanky boy]

@clanky boy any news?

Mike, apologies for delayed reply, but I finally got round to fitting the snubbers today. I got 8 x .1uF 120ohm and fitted all of them, one more each time. It has vastly improved but problem still there - that equates to .8uF and 960ohms! I disconnected them again and tried my 100w bulb again - problem goes instantly yet it equate to 500ohms and .41A, if my maths serves me correctly. Am I missing something or do I need much bigger snubber(s) say .22uF (220nF),470ohm snubbers- your thoughts please, kind regards, Mark.

 

[Mike Johnson]

If you know where the main power for the downlighter runs, put the snubbers as close to the first lamp as you can.

 

[clanky boy]

If you know where the main power for the downlighter runs, put the snubbers as close to the first lamp as you can.

I have put 7 snubber s into the first light JB. Flickers and then peters out over 30 seconds.

 

[DPG]

There's got to be more to this than just needing more and more snubbers chucking at it surely?

Not sure what though I must admit.

 

[Mike Johnson]

The snubbers need to be on each individual light not all bunched together, see post No 39 that is just one light connected at the lower end of the junction box.

Its the bulb that is picking up the Ghost voltage not the circuit.