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Old 08-29-2011, 03:27 PM   #1
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Default 3 way switch, stacking N/O contact blocks?

I have noticed on some of P-J's diagrams that it seems his 3 way switches seem to have 2 sets of NO contact blocks. Can you buy another set of NO contact blocks and just stack them on to the first set of a 3 way switch?

Example below:



Thanks,

~jake

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Old 08-29-2011, 04:39 PM   #2
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Originally Posted by IronBridgeBrewery View Post
I have noticed on some of P-J's diagrams that it seems his 3 way switches seem to have 2 sets of NO contact blocks. Can you buy another set of NO contact blocks and just stack them on to the first set of a 3 way switch?

Example below:



Thanks,

~jake
I am not sure I understand your question. Those switches are double-pole, double-throw switches with a center-off position.

Where/how do you want to "stack" something?
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Old 08-29-2011, 05:09 PM   #3
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You can add as many contact blocks as you want. I have done this on my electric rig to switch between the HLT and BK. It also switches which RTD sensor the PID is reading. One PID for both vessels.

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Old 08-29-2011, 05:53 PM   #4
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Originally Posted by Walker View Post
I am not sure I understand your question. Those switches are double-pole, double-throw switches with a center-off position.

Where/how do you want to "stack" something?
Here is the part number P-J used http://www.automationdirect.com/adc/...l&TxnNumber=-1

I didn't see anything about those switches being double pole 3 way switches. That may be what I was missing in this. It switching 2 poles at the same time. I just assumed it was using 2 sets contact blocks to accomplish switching to connections per each way.

P-J was switching 2 connections (current to coil voltage and sending +5v to ssr or setting output to ssr) at the same time. In his diagram its switches 5&6.



Thanks,

~jake
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Old 08-29-2011, 05:55 PM   #5
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ahhhh.... cool. I didn't see the link to the switches. Those are nifty.

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Old 08-29-2011, 06:43 PM   #6
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Yes you can add another N/O module to that switch.

Please keep in mind that the switch as shown from your link comes with a N/O & a N/C module. The switch is a "Center Off" 3 position switch. The behavior of a N/C module with a "Center Off" switch is somwhat difficult to handle with any wiring plan. You can remove the N/C module and add 2 (or 3)additional N/O modules to achieve what you want to do. No problem.

Here is a layout of the different types of "Center Off" switches with the connections shown in the selected positions. With the NC module, the center position has both of the N/C contacts closed.



Hope this helps.

P-J

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Old 08-29-2011, 07:11 PM   #7
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P-J that's what i was thinking. Thanks for your input, I realize that they come w/ n/c blocks as well as N/O that's why i was asking about just buying another set of NC contacts to accomplish what you were trying to in your diagram.

Thanks for the great explanation and diagrams P-J! Thanks to Walker for chiming in as always.

~jake

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Old 08-29-2011, 07:16 PM   #8
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Originally Posted by IronBridgeBrewery View Post
P-J that's what i was thinking. Thanks for your input, I realize that they come w/ n/c blocks as well as N/O that's why i was asking about just buying another set of NC contacts to accomplish what you were trying to in your diagram.

Thanks for the great explanation and diagrams P-J! Thanks to Walker for chiming in as always.

~jake
I relly hope the 'bolded' quote above is a typo. N/O - no?

With your setup, just remove the N/C block and add the N/O block(s).
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Old 08-29-2011, 07:48 PM   #9
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Sorry yes i meant NO, trying to type fast while at work dosnt always get out what i want. Thanks again,

~jake

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Old 08-29-2011, 08:10 PM   #10
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Jake,

You are more than welcome. If there is any way that I can help you with your setup, please let me know.

I might be old but I'm willing.

P-J

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