[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]
Re: (ET) Broken Breaker
Steve -
The Home Owner service manual has a short write-up under the heading
"Circuit Breaker CB-3" which indicates that there are actually two
protective devices on the E-20 motor. One, designated CB-3 on the
diagrams, is an internal thermal switch. They say it trips "if the motor
is overloaded for a long period of time" and that it auto-resets when
cool. From the schematic, it is in series with the brake switch and
should have the same electrical effect as stepping on the brake. CB-3 is
wired on a 4-wire plug going into the motor along with the two field wires.
Meanwhile CB-1 is the Klixon-like unit mounted on the outside of the
motor. The book doesn't way much about it, but from what I can gather it
is a typical thermal breaker. It will trip when the current passing
through is high enough to heat it to the trip point - much as a breaker in
a household circuit panel. I assume that mounting it on the motor is
intended to give it some sensitivity to the motor temp also. It looks
like it is wired to protect about everything except the lights and the PTO
in the factory wiring. I assume that yours took out the lights too
because of where you picked up the 36v for them in your rewiring.
That would seem to say that if there is an internal adjustment bolt it
would be hard to know where to set it.
BTW, the model number you got off of yours agrees with what I see on the
E-20 motor that I checked. One more item to see if we can find a handy
source.
- Tom Coate
Leesburg, VA E-20