RE: (ET) Nailed

["Konstanty, Walter \(GE Consumer & Industrial\)" <Walter Konstanty ge com>]

About 15 years ago I had it with those finger replays....always sticking, 
hot, etc....
Changed to 24 volt ones from Rum & Pottersfield..plug in ones...had to add 
a resistor to drop the voltage from 36 to 24 to run the relay but have not 
touched them since.....best thing to do....

...Walt

-----Original Message-----
From: elec-trak-bounces cosmos phy tufts edu
[mailto:elec-trak-bounces cosmos phy tufts edu]On Behalf Of Pieter
Sent: Tuesday, April 05, 2005 3:26 PM
To: Elec-trak list
Subject: Re: (ET) Nailed


Considering the spike my ET throws (and a lot of others too) on a 
too-quick 
shift from forward to reverse will weld a relay, it should be no surprise 
that you might get a shock!

At 11:58 AM 4/5/2005, Mike Wallace wrote:
>I've always been one to check for poor connections/high resistance with 
>the "Human Contact Thermometer" called a finger, but this too is a good 
>example why I just bought a Craftsman Infrared Thermometer off eBay for 
>about $30. Not to mention the slightly burned finger tips, but also the 
>cuts and bruises when you too quickly withdraw your hand out from under 
>there and hit something on the way out.
>
>And I'd be willing to say that there are some of you out there saying, 
>"Yeah, been there, done that".
>
>Mike in KY
>
>
>----- Original Message ----- From: "Christopher Zach" <czach computer org>
>To: <ev listproc sjsu edu>; "Elec-trak list" <elec-trak cosmos phy tufts 
>edu>
>Sent: Monday, April 04, 2005 9:51 PM
>Subject: (ET) Nailed
>
>
>>Well, it happened sooner than later. I got nailed by my Elec-Trak. 
>>Shocked on the left hand, and quite painful.
>>
>>Why you might ask? An Elec-trak is only 36 volts. And we all know that 
>>36 
>>volts is safe...
>>
>>Well, I was checking the temp of one of the shunts in the tractor. It's 
>>an exposed copper strip that was getting very warm under full load. So I 
>>put my hand in the unit and felt the temp with my finger while bringing 
>>the tractor up to speed. Then I cut the power to the motor.
>>
>>*WHAM*
>>
>>Felt like my hand was bitten. I pulled back; damn it hurt.
>>
>>What appears to have happened was that when I stopped the motor my hand 
>>was touching the shunt strip and one of the contactors. My guess is the 
>>transition of motor from on to off created a big EMF voltage spike 
>>either 
>>in the field or the armature, right thru CZ's hand.
>>
>>Moral of the story? You can be bitten by 36 volts. I take precautions on 
>>the Prizm's pack (never pull pack out without first subdividing it into 
>>60 volt segments *BEFORE* it comes out, all paths to the pack isolated, 
>>always use gloves, never reaching over the pack, etc) however this 
>>serves 
>>that one can even get bitten on something as innocent as an E20.
>>
>>Chris
>>
>>
>>
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>
>
>
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