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Ford 9N, 2N & 8N Discussion Forum
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OT Parmak Fencer Problem

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Wayne Mo

05-03-2006 21:23:08




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Thanks for the info from you guys concerning my failed Fencer. I called Parmak and talked to the service manager. He said my problem is likely a "PTC" switch which is designed to protect other components when there is a short on the board. I would like to know what PTC stands for. It is placed across the hot wire similar to the way an inline fuse would be but looks like a small ceramic capacitor! Anyway mine was open when I checked with a voltmeter, I had 115v on one side and hardly anything on the other side. I sent the unit for them to repair by likely replacing the board and the PTC switch for an estimated $30 plus shipping. He said the large capacitors seldom fail and most failures of the boards are due to poor grounds. They suggest 3 ground rods where I have only 2. Dell's idea of burying a cattle panel for a ground would be ideal but a little hard for me to do where the fencer is located. So what is a PTC switch? and how does a poor ground cause boards to fail? Seems to me that a poor ground or no ground at all would not affect the circuitry! It would be just operating open circuit it seems to me.

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Russ SoCal

05-04-2006 07:49:36




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 Definition FWIW in reply to Wayne Mo, 05-03-2006 21:23:08  
Polymeric Positive Temperature Coefficient (PPTC)
circuit protection



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dan hill

05-04-2006 03:09:34




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 Re: OT Parmak Fencer Problem in reply to Wayne Mo, 05-03-2006 21:23:08  
The PTC has only been used for a few years.It drops the input voltage when a problem developes on the circuit board.Its does have its own troubles though.I find many 30 amp fuses and lengths of wire in fuse holders.Use 1 amp only.Lightning strikes are the #1 problem.Lightning strikes happen during winter often.Fence chargers left on the fence line even if unplugged will get struck.



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Dell (WA)

05-03-2006 23:32:41




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 Re: OT Parmak Fencer Problem in reply to Wayne Mo, 05-03-2006 21:23:08  
Wayne..... ..yer grounding rods don't haffta be next to the fence charger, altho that is good. What is important is the surface area of the metal that conducts to the real dirt. (English sometimes have a better idea, they call it "earth")

While a 52"x16ft cattle panel is quite handy as a ground for electric fence charger, you could just cutt-itt into something shorter and still be ahead of the grounding effect of a regular 1/2" groundrod driven 8ft deep into the soil.

As as secondary note; grounding is very important for yer power company transformer substations. And broadcast vertical antenna need a good ground-plane to work efficently too. Their ground-planes are many wires radiating out from their central groundpoint..... ....Dell, the grounded

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dan hill

05-06-2006 05:02:54




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 Re: OT Parmak Fencer Problem in reply to Dell (WA), 05-03-2006 23:32:41  
If the fencers grounds are poor the hv pulse returns to the powerline ground.Since both sides of the line are fused the fuse takes a hit once a second.I have watched fuses in open holders when the power is turned on.Fuses flex each time.This explains why low current fuses open without reason at times.My fence charger does ok with two 8 foot copper clad ground rods.Rebar, water pipe and old buggy axles are not proper ground rods.The ground clamps that come with new chargers are worthless.Use a house service ground clamp.They wont rust and can be tightened properly

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Bob

05-03-2006 21:34:52




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 Re: OT Parmak Fencer Problem in reply to Wayne Mo, 05-03-2006 21:23:08  
Read about them at the link below:



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