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I certainly don't want to have anyone damage their tractor for
no reason, of course. But, as an old timer, I am amused by much of the
conversation on this and other techie lists- the extreme caution and fear of
experimentation. Now, I do realize that this is 35 year old stuff and not all of
it is easily replaced if it fails for any or <no> reason.
But before the 800 help line and the 'net, we were all
stranded in the field with nothing but maybe the service manual, our wits, and
education (learned more in a summer job fixing TVs and appliances than at
college for electrical engineering;-) There was no help, no one to call, and the
customer staring at me- so a few chances were taken, much learned, many
successes and a few spectacular failures! Great fun!
So my advice remains- have fun, take a chance and learn. If
you trash some parts, they are mostly low-cost items that can be substituted or
are still available.
PS: the E20 just uses a transistor or two to sense armature
current and "cut out" the field weakening resistors under load. Only in
speeds above direct connect, obviously. Been a while since I looked at the E20
diagram. They shouldn't be easily damaged and aren't expensive if they
fail.
----- Original Message -----
From: RJ Kanary
Sent: Thursday, June 15, 2006 8:51 PM
Subject: Re: (ET) running tractor on charger Maybe lower DC voltage.Have
you tried looking at the AC component of the output ? That's what the charger
diodes are looking at with no load present.
Yes, the
more robust components may not care about the electrical equivalent of toxic
waste being thrown at them, but what about the solid state components used in
the controls of the E-12 S, the E-15 AA through GA, and the E-20 AA through
DA?
Or
even those little bitty silicon diodes used in other model's circuitry,
such as the E-20 EA and later ?
Paranoid. Quite possibly.
Cautious.Most definitely.It's hard to put that Lucas® smoke back in to those
parts. :)
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