Mulja tv repair portal
General => General Forum => Topic started by: t1412 on February 23, 2010,11:56:08
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hello has any 1 repaired a cp500 fence energizer found transistor short circuit put another 1 in it came on for about 1 minute the went off any 1 got any info would be great thanks
regards
shaun
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Hi Shaun,
Being a country boy myself, have seen lots. Guess transistor is transformer driver, faults I've had are extreme damp and S/C secondary diodes and capacitors.
Ye hah - Chris.
PS - Just remembered, there are sometimes secondary series neons to limit the shock. If blackened they might be nearly S/C.
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ok chris thank's sorry to be cheeky you would happen to have circuit diagram knocking about
regards
shaun :thumbup:
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Hi Shaun,
Yer joking of course. Haven't seen a sensible manual since the V1, and after they landed we couldn't find enough bits on line to mend 'em.
We do most mending with string - Chris (Brit to the core)
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Hi Shaun. Over here in Oz we go through a lot of transformers in fence chargers. And quite often your "transistor" is an SCR. I suppose that you used a suitable replacement for whatever it has? The transformers have a tendency to arc over inside which may take up the transistor/scr. If you know what the dc voltage powering the primary is, you may be able to substitute (just for a test) a mains power transformer - For example if the rail is 12V you could try a 220:12v power transformer, connecting the 12v winding instead of the primary of the original. If it then keeps ticking over without destroying the semiconductor, maybe you need a new transformer. The manufacturers over this way (a lot of the chargers are made in New Zealand) refuse to hand out schematics. But it's fun to draw it out yourself, though it is probably a waste of time. Transformers over here are quite expensive, I have rewound one or two, but the complete outfits are cheaper now so it doesn't happen much any more. A farmer friend replaces the HV transformer with an ignition coil from a MV but don't try it if the outfit runs off the mains as in that kind of charger usually the HV fence transformer is the only isolation between mains and fence, and the ignition coil wouldn't come up to specs in the safety dept.. (LETHAL !)
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thanks for the interest i gave it back to my mate it was his girlfriends i managed to get a transistor for it but it burn't up straight away with out a diagram it was hard thanks again take it easy
regards
shaun
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Hi Shaun and Techno -
Hi Techno, guess you do more than me - never had a tx gone meself but guess the antipodes is wetter than the old UK with all this warming stuff giving us a summer warmer than that '70's biz.
Admit electric fence stuff in UK is currently on hold due to excessive drought, and where our food animals are liable to giggle, due to that small earth leakage - Maggie and our Queen would have had some suggestions - makes one think, well, a bit - Chris.
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Hi, Turnip. If you place a dry glass bottle with the neck end pointing to the ground indoors, eventually you find moisture in the bottom of the bottle (which is now at the top). I expect since most of the electric fence chargers are weatherproof they are fully sealed at the top with no vents. The condensation probably builds up with time. Maybe that has something to do with it. Just why we have more faults of this kind, I can't answer. One technician I had working for me said that the chargers for sheep had a lower output voltage and less power than the ones for cattle, so, if true, that could be a reason. I think we would have more cattle stations than you would. We would certainly have longer fences! That reminds me - there should be a solar powered unit here somewhere with a duff transformer. I should pinch the panel and put it to use powering a doorbell or something. All the best.....Technomaniac.
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Hi Tech,
Interesting thought.
As a home beer maker, have many upturned bottles and have never noticed a build up of moisture indoors, thankfully.
Most fence chargers are left out in the rain 'till they die, and with temperature variations causing air pressure changes, moisture inevitably builds internally until a short occurs.
Had the same trouble with bird scarers where moisture kills the works and no shematics available, but just discovered a V1 blueprint on 'Yesterday' - Chris.