So the problem is solved... But I'm not really sure why. The contactor I
received as a replacement was slightly different than the one I removed
from my C-185 as it had two small symbols next to the small wire posts
(the wires energizing the internal coil). I didn't pay to much attention
to these as it's a coil right? I mean it works both ways. Or so I
thought. On advice from one of our own I swapped the wires on the
terminals. All speeds FWD and REV work and the fuse didn't smoke. Who
would have thought.
Anyway, thanks to everyone for their advice. I love my ET.
Bob Klein
Charlestown, RI
-----Original Message-----
From: Christopher Zach [mailto:czach computer org]
Sent: Thursday, June 15, 2006 11:29 AM
To: Klein Robert W NPRI
Cc: 'Perry Cain'; elec-trak cosmos phy tufts edu
Subject: Re: (ET) HELP
Klein Robert W NPRI wrote:
Thanks to Tom Kuffa I was able to swap out the broken bakelite 1A
contactor. Put a new 20amp fuse in the block, engaged the power
switch, put the transmission in neutral and pushed the pedal down
slowly. The motor started right up in position one. Continued
pushing and the fuse opened with a flash. Rechecked my install
against the schematic and everything appears OK. Put in another
fuse... Same thing. The fuse opens in the second speed microswitch.
Being as I had cooked the terminal off the heavy 1A power wire could I
have arc/fused/damaged something else that would cause this short?
What are the recommended troubleshooting steps?
Well, speed 1 is all resistors in, contactors out. Speed 2 is where 1A
is closed to bypass resistor 1. Apparently your control circuit is
blowing at this point.
It sounds like the problem is in the circuit that controls the closing
of 1A, and not the main wires off 1A. That's what the little 20a fuse is
blowing over. So check out the small wires that are supposed to trip 1a.
If you remove those wires from the contactor, do they have infinite
resistance to each other? How about to frame ground? Does the tractor go
thru the speeds (albeit with resistor 1 close) with the little wires off?
Chris
_______________________________________________
Elec-trak mailing list
Elec-trak cosmos phy tufts edu
https://cosmos.phy.tufts.edu/mailman/listinfo/elec-trak