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  #46  
Old 12-10-2007, 07:00 PM
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I see. So in addition to the PLC, I'll need some sort of high speed, high load switching device. Would a solid state relay do the trick? I mean one rated for switching 240vac, with a 12v trigger.
I can get most any components, I just need to know what I'll need. I'm an electrician/mechanic in a fairly large factory. My electrical consists mostly of loose wires/blown fuses ETC.
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Last edited by crazyhorse; 12-10-2007 at 07:04 PM.
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  #47  
Old 12-10-2007, 07:04 PM
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Quote:
Originally Posted by crazyhorse View Post
I thought induction was an AC phenomena. I could see if we were creating a positive to negative wave form, but were doing a simple digital switch. Granted there is quite a load, but I think the PLC's I have access to are capable of handling it.

I don't fool myself, I'm no expert. So enlighten me if I'm wrong.
When a DC supply to an inductive load is interrupted, there is revers discharge which must be dissipated. You may have seen a diode connected across relays for this purpose. Where contacts are involved in the switching, arcing can otherwise occur. In the case of AC, phase reversal during switching prevents the problem.
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  #48  
Old 12-10-2007, 07:23 PM
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So I'll need a relay of some sort. Would a solid state relay rated for 240vac, with a 12v trigger work?
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  #49  
Old 12-10-2007, 08:47 PM
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So I'll need a relay of some sort. Would a solid state relay rated for 240vac, with a 12v trigger work?
As likely as no help in hell.
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  #50  
Old 12-10-2007, 08:53 PM
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Well CRAP!
A simple logic circuit would likely fry under that kind of load.
What would take the load, and still be fast enough?
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  #51  
Old 12-10-2007, 08:59 PM
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Well CRAP!
A simple logic circuit would likely fry under that kind of load.
What would take the load, and still be fast enough?
Something custom designed and suitable for both the input and output parameters involved.
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  #52  
Old 12-10-2007, 09:02 PM
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Now all we need to know is what those parameters are.

Give me some time, I'll get my meters on it!
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Current Stable By Age:
'89 Subaru XT6 Silver "Audrey" as in Hepburn
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  #53  
Old 12-10-2007, 10:06 PM
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can anyone with a scope measure the wavelengths of the stock circuit?? If so, I know the DCCD controller I use may also be able to be used to generate wavelengths that we desire. once I have an auto around to mess around with I will play with the resistor that you had mentioned Trevor... Really I have no use for this but the idea popped up in my head

Tom
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  #54  
Old 12-10-2007, 10:49 PM
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can anyone with a scope measure the wavelengths of the stock circuit?? If so, I know the DCCD controller I use may also be able to be used to generate wavelengths that we desire. once I have an auto around to mess around with I will play with the resistor that you had mentioned Trevor... Really I have no use for this but the idea popped up in my head

Tom
Tom,

The frequency (waveform) of the signal involved is around 50 CPS, which is close to the frequency of your AC mains supply, which I believe is 60 CPS, ours being exactly 50 CPS. This gives you the feel of what is involved in respect of the frequency of the pulses, if you consider AC hum as an audio frequency. However it is the length of the "on" pulses within the constant frequency rate which provide control.

I am disappointed to learn that you really do not have use for what you proposed in view of the in time and effort expended. Even so it has been an interesting exercise.
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  #55  
Old 12-10-2007, 11:05 PM
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well only owning a 6mt this makes no difference in my life. it is a good thing for others and the idea was maybe have an option out there for the auto guys experiencing a slow acting AWD system to fix their issues

Tom
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