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Post by Deleted on Nov 19, 2008 19:24:25 GMT
Please can anyone help with this. My sister does technical translations from German to English and has sent me the following which I do not follow at all. - John
"Could you please tell me whether the following makes sense from an electrical point of view?
The German sentence translates syllable-for-syllable to this:
The rail treadle is a working current element, unlike the isolation, which is a resting current element.
If I use the dictionary provided by the customer (always a dodgy thing to do) I get this:
The rail treadle is a open-circuit element, unlike the insulation, which is a closed-circuit element.
(BTW, a "rail treadle" is (they assure me) a thing on the rail that reports whether or not an axle has passed it. Interestingly, this is different from the thing that counts the axles to decide when all the train that came in has gone out again.)
Could you please tell me whether either version makes sens to you? And if not, construct something that does?"
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mrfs42
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Post by mrfs42 on Nov 19, 2008 19:56:35 GMT
Both versions make sense; however I think what is trying to be explained is that the treadle is a normally open switch, closed by the train. The integrated circuit for the treadle will draw current when working.
What sort of treadle - proximity sensor or mechanical treadle? I've got some stuff on treadles at home or use your google-fu with 'Silec' treadles.
HTH.
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Post by railtechnician on Nov 20, 2008 9:17:55 GMT
Both versions make sense; however I think what is trying to be explained is that the treadle is a normally open switch, closed by the train. The integrated circuit for the treadle will draw current when working. What sort of treadle - proximity sensor or mechanical treadle? I've got some stuff on treadles at home or use your google-fu with 'Silec' treadles. HTH. I have always understood a treadle to be mechanically activated by train wheels. Position detectors and/or axle counters are as you say proximity sensors.
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mrfs42
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Post by mrfs42 on Nov 22, 2008 15:51:28 GMT
True; however the term 'treadle' has become a bit diluted over the years; in certain circumstances - using a proximity detector in lieu of a treadle, or level crossing initiation 'treadle' tends to be used.
Returning to the OP, I'm now convinced after a bit of thought that this is referring to an electronic treadle. Open circuit, negligible quiescent current draw; that sort of thing. Sounds very similar to bits of kit I've used in a previous existence to control level crossing lights/directional inhibits where track circuits can't be used.
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