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  #41  
Old 05-27-2013, 10:29 AM
Kiril Kiril is offline
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The math, as displayed in the vector diagram
That is not a vector diagram.
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  #42  
Old 05-27-2013, 11:18 AM
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Quote:
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That is not a vector diagram.
Well, it is a diagram, and it does display the vector quantities of resistance and reactance, as relates to solenoid operation. Besides, making the points on vectors in a diagram takes too much time.

I'm way out of date on a lot of electronics terminology. Wiki searching showed me the inverse of ohm is now 'siemen', as opposed to 'mho' (a term I always liked, besides being a great scrabble word)
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Old 05-27-2013, 01:06 PM
irrig8r irrig8r is offline
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Did you replace the back panel in the box? I got a few of those through my distributor but only encountered it maybe three times. there was an RB technical bulletin that addressed it thoroughly.
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  #44  
Old 05-27-2013, 04:07 PM
Kiril Kiril is offline
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Originally Posted by Wet_Boots View Post
Well, it is a diagram, and it does display the vector quantities of resistance and reactance, as relates to solenoid operation.
Does it?

http://physicspages.com/2013/02/19/m...of-a-solenoid/
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  #45  
Old 05-27-2013, 06:32 PM
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Quote:
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I could expect no less from a true Magnet Boy, but nothing on that page you linked has anything to do with the electrical characteristics of a solenoid powered by 24 volts AC
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  #46  
Old 05-27-2013, 08:48 PM
Kiril Kiril is offline
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It doesn't? From link.
A solenoid is a helical coil of wire wound round an insulating cylinder. We can find the magnetic field due to a solenoid carrying a steady current I as follows.
Explain how it doesn't relate ... in mathematical terms.
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  #47  
Old 05-27-2013, 09:24 PM
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Not very relevant to measuring 30 ohms DC resistance in a solenoid coil, and then observe it displaying an impedance of 120 ohms with a 60 Hz voltage applied. My homemade diagram showed how the DC resistance and the AC reactance combine to give the total impedance. Feel free to make a superior impedance diagram.
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  #48  
Old 05-28-2013, 11:10 AM
Kiril Kiril is offline
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Originally Posted by Wet_Boots View Post
Not very relevant to measuring 30 ohms DC resistance in a solenoid coil, and then observe it displaying an impedance of 120 ohms with a 60 Hz voltage applied.
Why is it not relevant? Is it not the purpose of a solenoid to generate a magnetic field?

Quote:
Originally Posted by Wet_Boots View Post
My homemade diagram showed how the DC resistance and the AC reactance combine to give the total impedance.
I asked you for the math, but more to the point, explain how one might go about doing this in the field. Further, explain how this applies to an AC solenoid, once again, mathematically.

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Feel free to make a superior impedance diagram.
You mean a phasor diagram?

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  #49  
Old 05-28-2013, 12:06 PM
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Since there isn't any appreciable capacitance in the solenoid circuit, the diagrams and equations can be a lot simpler. I will add some half-points to the three vector quantities, and, because it matters not in sprinkler work, I'll leave out the phase angles.

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  #50  
Old 05-28-2013, 12:26 PM
Kiril Kiril is offline
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No explanation, and no math.
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