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WHY?
What relay?
- Thread starter StuManFlu
- Start date
Otherwise the dimmer (switched live) wouldn’t Be controlling the fan
Otherwise the dimmer (switched live) wouldn’t Be controlling the fan
Why a Gate-turn-off type?
Just a standard TRIAC should work since everything works from AC.
No it doesn’t. Think about it it the fan was connected before the switch then it wouldn’t be a switched live it would be a live and the fan would be on all the time. The issue is the switch needs to trigger the fan on and off (on timer) the problem is it’s a dimmer switch and the flucation in voltage on the switched live effects the fan.
I hope that’s clear.
Would a standard TRIAC be controlled on and off by the trigger voltage (switched live)? I thought when they are on they stayed on until the supply is turned off.
So trigger by a switch to supply voltage from a permanent live that wouldn’t stop until the supply from the permanent live is disconnected?
please advise as I don’t have a lot of experience in TRIAC.
I need the gateway to be trigger to open by the switched live and close when the switched live is closed.
In your diagram you show a switched AC to the dimmer. Where is that coming from, the WIFI?
SAG
A hot lighting circuit. The switch controls the lights and the fan
True, for the supply voltage.
And with an AC supply the voltage goes to zero twice every cycle, which allows the TRIAC to turn off.
Last edited:
djsfantasi
- Joined Apr 11, 2010
- 9,237
Ok, to simplify the problem statement, the relay CAN’T be after the dimmer. We are talking about the relay coils. The relay not only will not operate reliably, it WILL NOT activate when you want it.
So you need to find somewhere else to activate the relay. I don’t understand why you can’t switch the relay coil at the output of the switch and before the dimmer. Then, the relay contacts can control the dimmer output to the fan...
So you need to find somewhere else to activate the relay. I don’t understand why you can’t switch the relay coil at the output of the switch and before the dimmer. Then, the relay contacts can control the dimmer output to the fan...
That's what I was trying to say but apparently it's not switched.
SG
Hi, so it’s meant to work from the switch that’s the issue. The fan comes on when the lights are switched on. The problem is as it’s a dimmer it effects the fan. So looking for a way to activate the fan from the switch but supply Power from a different supply so it’s not effected by the dimmer.
Hope that is clear?
This looks very interesting thank you. Is that TRIAC? Do you think that could work in this scenario?
If the TRIAC can do the job of switching supply’s from the switched to the permeant then maybe I don’t need the relay in there?
Got it I think; so if the switchEd live wasn’t providing a voltage (switch turned off) then the TRIAC would turn off the permanent at the cycle when the AC hits zero volts? But if the switched live is providing voltage then the the TRIAC would continue to provide a supply from the permeant?
Yes.
The TRIAC should be able to switch the fan power directly, but the fan may buzz some from the chopped waveform.
You may want to use the TRIAC to control an AC relay to avoid that possibility, unless a buzz from the fan would be no problem.
Got it great. How do you buy TRIAC? Is there someone who makes a unit. I can find mainly led light controllers.
Where are you located and what electronic suppliers do you use?
I guess I’m a way from where u are. I live in the UK... so it will also have to work at 240v.
