I recently bought a used Rockwell bandsaw, which had been refitted
with a Baldor 1 hp motor, that was set up to run on 220V. I was told
that I could rewire it to run on 110V, which is all I have in my
garage. The saw ran on 220v when I tested it just fine.
So, I dutifully tried to make the change, but now it does not run.
I’m hoping someone can tell me my mistake.
Here’s what I did: The motor had 2 schematics on it, for “low voltage”
and one for “high voltage.” The high voltage schematic showed this:
wires #2/3/5 together; wire #1 alone (which I found to be connected to
the cord’s brown wire also); wire #4 to “line” (I found #4 to be
connected to the cord’s black wire); wires #J/8 together. This is, in
fact, how it was wired when I opened it up.
The second schematic showed this: wires #1/3/5 together (which I left
also connected to the cord’s brown wire); wire #4 to “line” (which I
left connected to the cord’s black wire); wires #2/J/8 together. I
reconnected things following this schematic (in other words, I moved
#2 from 2/3/5 to J/8 and connected 1/brown to 3/5; I left 4/black
[As a sidenote, the motor also indicated that “to reverse rotation
interchange #5 and #8”—since #s 5 and 8 had been switched in the
existing wiring I found, and therefore rotation had already been
reversed, I also treated #5 as #8…including all of the descriptions
above, where I’ve already substituted 5 for 8]
Then, I switched the male plug. The 220V plug had green, black, and
brown wires going to it; green connected to “G”, black connected to
“Y”, and brown connected to “X”. I put on a new 110V plug and
connected the green to the green screw, the black to the brass screw,
and the brown to the silver screw.
It does not turn on now. Please help! I really appreciate it. I
don’t have much money and really need to get this working…
I would take it to an electric motor shop. They could surely correct your
wiring while you wait.
My take on your message is:
"low voltage" means 110v. The usual 110v cord has a black (hot) wire, a
white (ground) wire, and a green (neutral) wire.
"high voltage" means 220v. The usual 220v cord has a black (hot) wire, a
red (hot) wire, and a green (neutral) wire. Sometimes other hot wire is
white instead of red.
Unless you have a multimeter to test continuity, you may not be able to
solve the problem by yourself.
What the schematics show is how to change the wiring of field coils from
being in parallel to being in series.