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Re: (ET) E15 oddness...

On 5/9/2011 8:10 PM, David Brandt wrote:

Sounds like what happens to me - the field is staying on whenever the
tractor is in motion, so when you are trying to reverse while still in
motion, this arcs the relay and blows the fuse. On mine the field is
manually controlled, but on the originals, wasn't the MOV what prevented
this? You need that field card installed.
Maybe. This fuse panel to be honest is junk, it goes high resistance. It's possible it is going open, which causes an arc to form which drives up the current (the field acts like an arc stabilizer I think, kind of like the welder accessory) to the point where the fuse blows. 

Or something.
In addition the tractor is doing something "odd" which is not good: After the last fuse blow the fuse is out but the meter is still reading voltage on the pack. As soon as I try to engage any relay (go into reverse, try to go into drive) it drops to zero and the relay "chatters".
This is according to the schematics impossible, so battery negative is somehow leaking to line 13 (the controller neutral). I'll guess it's coming from the card 1 through one of the contactors. Which means if I go into drive right now there will be a short as soon as the appropriate transistor/scr comes on and boom will go another fuse.
Glad I used a molex to put card 1 in. Maybe it's that transistor on card pin 4, I knew I should have used a 50 volt one instead of a 40 volt one.... 

Chris




I believe the HSM is on the elec-trak.com site in PDF. It has block
diagrams and schematics. To an electrical novice like me, the block
diagrams help a lot. It'slike 12 MB and covers all the models.
David Brandt

*From:* Christopher Zach <cz alembic crystel com>
*To:* elec-trak cosmos phy tufts edu
*Sent:* Monday, May 9, 2011 3:25 PM
*Subject:* Re: (ET) E15 oddness...

So I drove around with the wreck-that-is an E15 yesterday. One of the
tires is dead-flat, but I think the front ones are still holding air
(sprayed the needle valves with silicon to lubricate the rubber seals).
One tire is totally shot, and of course it has no seat or anything in
the back :-)

However an odd thing happens: I had a 7a fuse on the controls, and it
would blow pretty regularly. I replaced it with a 20 and it drove fine,
but if I didn't totally stop before going into reverse the fuse would
blow, the voltage gauge would display voltage, and as soon as I put it
into gear I would hear a click click click and the voltage would drop to
zero.

Another odd thing: Letting it run in neutral to check the contactors I
noticed that although speed 2 makes the contactor click, motor speed
does not change. Might be a bad contactor, will check. However after
awhile the motor speed would fluctuate down a bit, then come up, then
down, then the 20a fuse would blow again.

Relay arcing perhaps? I'm still using an old relay for FW, maybe it's
arcing the field and blowing the 20a fuse.

I really wish I had the page of my owners' manual that had the schematic
for the E15; I think I lost it. Can I get a copy of the manual from
somewhere?

However any idea what's up? I haven't pulled Card 1 to check for damage,
but I don't have the resistor/MOV card in there yet for field weakening.

C



On 5/9/2011 2:10 PM, Steve Caplan wrote:
 > Hi guys.
 >
 > My e15 with Alltrax controller took a dive. The pto relay was pitted &
 > was arcing so I pulled it out & filed the contracts. After I reinstalled
 > it I flipped the pto switch and the mower motors ran fine. Stitch off.
 > Then I backed
 >
 > out of the garage went 10 feet towards the lawn flipped the pto switch
 > on mowers started to spin & everything quit. Pushed it back to the
 > garage pushed in the power disconnect switch & fire came from b3. HELP!
 >
 >
 >
 > _______________________________________________
 > Elec-trak mailing list
 > Elec-trak cosmos phy tufts edu <mailto:Elec-trak cosmos phy tufts edu>
 > https://cosmos.phy.tufts.edu/mailman/listinfo.cgi/elec-trak


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