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Old 12-04-2008, 05:37 PM   #16
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When I can find a scanner I will post a picture of how our shop teacher explained to us how to do it. It does makes sense now that he explained it to us. But I do know now that I need to work on ladder diagrams. I will be proficient at it by the end of the year.

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Old 12-04-2008, 10:38 PM   #17
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The drawing that Wirenut posted will work just fine. The motor starters (MS1, MS2, and MS3) can be 3 pole double throw relays as well.

The relays will be far less expensive, but the motors will need to be single phase, and be overload protected by fuses, separate overloads, or built-in thermals.

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Old 12-05-2008, 01:39 PM   #18
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Quote:
Originally Posted by Pudge565 View Post
But I do know now that I need to work on ladder diagrams. I will be proficient at it by the end of the year.
When you get a minute,
you should figure out AND gates and OR gates. And, Exclusive ORs. These "logic functions" are used everywhere.

E.g. the Check Engine Light implements an OR function. Any one or more sensors indicating car problems will light the light. Probably half a dozen sensors scattered throughout the engine and transmission feed this one light.
With paralleled N.O. switch contacts, or paralleled switching transistors, any one closing can run the motor.

N.O. switches in series implement an AND function; they all must be closed to pass current.

Last edited by Yoyizit; 12-05-2008 at 02:22 PM.
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Old 12-06-2008, 12:48 PM   #19
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Quote:
Originally Posted by wirenut1110 View Post
Here's one way it can be done
Wirenut, Thanks. That was what I would have drawn for the OP. Did you take a picture of the drawing? Oh. yes it looks fine and would be what the OP needed.

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