Hello everyone,

I made 3 fans for resin 3d printer enclosure. 2 of those are main fans to take air out of chamber and third one is inline fan to push air further down the pipes. I have 2 switches and want to wire 2 main fans to those switches so one switch controlls one fan. How can I connect the third fan so that when any of two main fans are on the third fan also turns on. I have tried a few schematics, but none of them work. Thank you for any help.

 

What is used to power the fans? Voltage? AC/DC? Do the fans each have one side tied together?

It could be as simple as adding two diodes…

 

What is used to power the fans? Voltage? AC/DC? Do the fans each have one side tied together?

It could be as simple as adding two diodes…

Sorry, I forgot to mention, fans are powered by 230V AC so diodes cant be used.

 

Or replace the existing Switches with Double-Pole-Switches.
This would be the simplest solution.

Do You have a part/number, or PDF, for your existing Switches ?
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Two relays with 230VAC coil and 1 NO contact. Coil in parallel to the fan, same Fan N#1 and Fan N#2. Both NO contacts in parallel . They will power on the third fan

 

Or replace the existing Switches with Double-Pole-Switches.
This would be the simplest solution.

Do You have a part/number, or PDF, for your existing Switches ?
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I am currently using this switch.

 

Two relays with 230VAC coil and 1 NO contact. Coil in parallel to the fan, same Fan N#1 and Fan N#2. Both NO contacts in parallel . They will power on the third fan

Thank you for great idea, but I am trying to make it work using only switches.

 

I am trying to make it work using only switches.

So connect the switches as follows:

Below -- Pin 1 to the 220V, pin 2 to it's respective main fan, and pin 3 in parallel with the other switch pin 3 to the inline fan.
Pins 2 and 3 can be swapped if that makes the wiring easier.
Make sense?

 

Yes, but then I can't turn on only left or right fan

 

Yes, but then I can't turn on only left or right fan

Why?
Obviously you need two switches, one for each fan.
Don't you have two?

 

Why?
Obviously you need two switches, one for each fan.
Don't you have two?

I do have two, but if I make parallel connection between pins 3, current will travel between both switches, so all fans will turn on.

 

I do have two, but if I make parallel connection between pins 3, current will travel between both switches, so all fans will turn on.

No.
Not if the switch works as shown on its schematic.
Yes, the voltage will be on both pin 3's if one switch is on, but it will not go to the fan whose switch is off, since contact 3 is open when that fan switch is not on.

 

Is your Switch "Multi-Position" ?, or just "On-Off" ?
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Well, switches have two handles but I suppose I could glue them together. Thank you.

 

That is a special proprietary Switch,
there's probably nothing You can change about it, or the way that it's wired.

Make a Blank-Cover for the Junction-Box and install 2 standard Double-Pole Switches.
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