Author Topic: Switch wiring id driving me nuts  (Read 2985 times)

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Offline AngraMeloTopic starter

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Switch wiring id driving me nuts
« on: November 27, 2018, 01:31:06 am »
Hello guys, I have the attached schematic and I´m about to wire the switch. What I have is a 12 position selector switch. It has a common pin that is then connected to the other 12 pins (one at a time) as you rotate it.
I have no idea how to wire it by following the schematic. I dont know if I need 2 switchs or if I need to brigde the contacts.
Can someone please help me?
 

Offline piguy101

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Re: Switch wiring id driving me nuts
« Reply #1 on: November 27, 2018, 01:59:34 am »
It looks like to me that the switch is a double pole, five throw switch (DP5T). Is it something like this? 1825080-4 from TE https://www.digikey.com/products/en?keywords=450-2422-ND

Or is it more like a rotary switch, or something else?
 
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Offline AngraMeloTopic starter

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Re: Switch wiring id driving me nuts
« Reply #2 on: November 27, 2018, 02:06:59 am »
Hello friend,
it is a rotary switch. here is the video of the guy making this project

 

Offline rstofer

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Online Brumby

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Re: Switch wiring id driving me nuts
« Reply #4 on: November 27, 2018, 03:32:16 am »
It's a double pole 5 position switch.  Each bank has 5 positions and they are labelled SW1-A and SW1-B - which is interpreted as Switch 1, bank A and Switch 1, bank B.  Each bank is electrically isolated from each other, but are operated together through a common mechanical movement.

You can have it in a linear arrangement or rotary.  Rotary is the most common in my experience.

There are many ways to build a rotary switch - so I'm not going to try to describe more than just this one style....

A common style is a single wafer with 12 contacts spaced at 30º around the perimeter.  Inside this ring, there are (typically) 1, 2, 3 or 4 other contacts.  All these are fixed in relation to the body of the switch.  Mounted to the shaft is a switching plate that will have 1, 2, 3 or 4 pairs of wipers.

You can get them with PCB pin or eyelet terminations:
     

The configurations possible are, respectively, 1 pole, 12 position; 2 pole, 6 position; 3 pole, 4 position and 4 pole, 3 position.  This is the general construction - you buy your switch in one of those configurations.



There is usually a mechanical stop at each end of the rotation movement so you know when you've reached the first and the last position - but you can also buy a switch that has these mechanical stops placed differently.  This means what looks like a 2 pole 6 position switch can have a stop after the 5th position - so it pays to check how many positions a switch actually has before soldering it in.

Edit: Spelling
« Last Edit: November 27, 2018, 11:48:20 pm by Brumby »
 
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Offline AngraMeloTopic starter

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Re: Switch wiring id driving me nuts
« Reply #5 on: November 27, 2018, 05:09:31 am »
Thank you so much!!!!
 

Offline Ian.M

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Re: Switch wiring id driving me nuts
« Reply #6 on: November 27, 2018, 06:12:44 am »
You could also use two switches, one four way single pole rotary for the range selection at the SW1-B position in your circuit, and the other a SPDT toggle switch for the Test/Discharge switch at postion SW1-A.   Be careful of the voltage rating of the toggle switch - there aren't many that can safely handle 400V DC
 
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Offline TERRA Operative

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Re: Switch wiring id driving me nuts
« Reply #7 on: November 27, 2018, 10:37:12 am »
Those switches that Brumby pictured can often have their end stop adjusted.

ie. for a 2 pole switch, each pole is shown as having 6 positions. By removing and rotating the metal ring seen at the base of the threaded portion to the appropriate position, you can limit the switch to 5, 4, 3 or 2 positions etc.
Where does all this test equipment keep coming from?!?

https://www.youtube.com/NearFarMedia/
 
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Offline AngraMeloTopic starter

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Re: Switch wiring id driving me nuts
« Reply #8 on: November 27, 2018, 01:26:10 pm »
Thank you guys for the help
I could use another separate DPDT switch but that means one more step during testing and as much as I wanted to use the rotary that I had (1pole 12 positions) it seems that Im going to order the correct 2 poles 5 positions.

I finally understand the schematic, thank you again for your help!
 

Offline spec

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Re: Switch wiring id driving me nuts
« Reply #9 on: November 27, 2018, 06:51:01 pm »
What a great thread- just help and information all the way. :-+
 
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