12 volt electrical diagram for a 420

[Stan Disbrow]

Hi,

Yes, for the big tractors, they came out with all 24v parts and wired them up in series. For what little needed 12v, just tap it off the positive terminal of the one battery. On the smaller tractors, just go wihn12v. Much better.

Stan

[whiteclipse16]

That was a great write-up Stan. My dad has an old Farmall C and when he was redoing it he ran into the issue of whether the cut-out was in the regulator or not and the Hi-Lo setting on the ignition switch.
Speaking of migraine inducing topics, have you worked on MG Sets and Amplidynes any?
I've looked at some schematics for those and wow, you def. had to know your stuff when troubleshooting and tuning those.

[Stan Disbrow]

Hi,

I used to mess with MGs that made 440v 400 cycles. Lotsa watts thru skinny cables. Also electronic generators that allow for whatever voltage and frequency you need. Really just fancy oscillators with huge amplifiers. Fun stuff.

After those sorts of things, tractor systems are a vacation on the beach!

Stan

[whiteclipse16]

Haha, fun stuff for sure.

Yes after going through school and reading posts like yours I'm much more understanding of simpler tractor electrical systems.

Do you tamper with VFD's much? They work great as a phase converter I put one in for my dad to run his milling machine.

[Stan Disbrow]

Hi,

I have 3ph motors on my machines, and 1ph power. I use a simple buzz box to fire off a spare 3ph motor with a flywheel on the shaft. That works as a rotary phase converter well enough.

The way it works is 1ph power, as an electrician sees it, is really 2ph power as an electrical engineer sees it. Two 117v lines 180 degrees out of phase. So, I hook both of those up to two of the 3ph lines. That is close enough to the 120 degree phases to function. The magnetic fields generated by those two windings produces voltage in the third wire. That gives all three phases to the machine motors to run at about 80% their horsepower rating.

So, the extra motor functions like a motor generator. But in a smaller package than having a 1ph motor driving a real 3ph generator. The buzz box produces the third phase during spin up, then is cut out. It isn't the best way, but is Good Enough.

Stan