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Re: (ET) Help, reverse missing?
Here is a picture of my E12 diode replacement terminal strip.
http://wb9tlh.smugmug.com/popular/4/41718421_Ax3MX#41718421
Good luck
Dwight
Dwight L. Hazen
Indiana University, UITS, Networks
Bloomington, In. 47408-7378
812-855-5367
Ham Radio wb9tlh arrl net http://wb9tlh.ampr.us
-----Original Message-----
From: elec-trak-bounces cosmos phy tufts edu [mailto:elec-trak-bounces
cosmos phy tufts edu] On Behalf Of Christopher Zach
Sent: Friday, February 22, 2008 11:14 PM
To: maxmatic gmail com
Cc: Banks, Michael J.; elec-trak cosmos phy tufts edu
Subject: Re: (ET) Help, reverse missing?
E12's are different from E15's: On an E12 the field stays constant while
the armature polarity changes by the 4 big contactors. On the E15 they
change the direction of the field with a little relay which gets blown up.
Bad idea.
I'm guessing the problem is one of the two diodes that powers the field
is blown. The E12 has a little tiny board with two diodes in there that
go to the field and provide power going forward and reverse. If one
fails you lose field in either forward or reverse.
Way to test: If you can put it in neutral, floor it, then see if the
motor turns while pegging the amp meter. If so check those diodes.
E20's have 4 diodes on card 4.
Chris
Max Hall wrote:
> I'm with Joe. Last time *my* E-15 lost reverse it was because the
> reverse relay contacts had FUSED. That'll be from injudicious rate of
> change from forward to reverse (or is it vice-versa?) Anyway, I happened
> to have a spare relay from which to take a contact "stack" and replace
> the one I wrecked. I've been a much more careful direction-changer ever
> since.
>
> By the way, if the relay looks ok, follow the coil wire back to Card #1
> and check that the edge connector connection is ok... that's a notorious
> point of failure. Er, that is, if the E-12 has similar wiring.
>
> In any case, good luck!
>
> -Max
> E-15 with a Craftsman plow, E-20 with a 40" thrower, and I think the
> plow is a miracle worker!
>
> On 2/22/08, *Solid Technologies* <solidtech qwest net
> <mailto:solidtech qwest net>> wrote:
>
> Mike,
>
> It appears to be an issue with the reversing relay. When mine
> quit working I looked for a 36V relay but couldn't find one so I
> used a 24V heavy duty relay with a dropping resistor in series with
> the coil and it has worked great ever since. I have an E-15, but
> I'm guessing the reverse relay is very similar. You might also want
> to verify that the switch controlling the relay is good - mine has a
> small arm that is depressed by the speed control lever when you put
> it in reverse.
>
>
>
> Joe
>
>
>
>
>
> -----Original Message-----
> *From:* elec-trak-bounces cosmos phy tufts edu
> <mailto:elec-trak-bounces cosmos phy tufts edu>
> [mailto:elec-trak-bounces cosmos phy tufts edu
> <mailto:elec-trak-bounces cosmos phy tufts edu>] *On Behalf Of
> *Banks, Michael J.
> *Sent:* Friday, February 22, 2008 2:49 PM
> *To:* elec-trak cosmos phy tufts edu
> <mailto:elec-trak cosmos phy tufts edu>
> *Subject:* (ET) Help, reverse missing?
>
>
>
> I was using my E12 with a 36" snowblower to clear our driveway this
> afternoon. I had about 10sqft left to clear and reverse stopped
> working.
>
>
>
> All the forward speeds worked fine. There was plenty of
> charge. I could hear what sounded like a relay clunking when I
> moved the lever to the reverse. But no motion, and the fuel
> guage/usage meters didn't move.
>
>
>
> So I kept going from off to reverse, off to reverse until I got it
> to move backwards. Coincidently one of the chains had fallen off
> the rear tire. So I backed it into the garage and put the chain
> on. I was going to just put it away but I tested reverse a couple
> of times in the garage and it seemed to work. So I went back
> out. As soon as I needed reverse it wouldn't work again.
>
>
>
> This time I kept flicking the switch until it went into reverse and
> parked it in the garage.
>
>
>
> Once it was in the garage I put the gear into neutral and tested.
>
>
>
> Forward speeds work
>
> Reverse doesn't (mostly)
>
>
>
> How do I fix this, or where do I begin my search?
>
>
>
> Thanks.
>
> Mike
>
> Colchester, CT
>
>
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