Elec motor / saw running backwards
Jerry Stackhouse
There is no way to mechanically change the rotation or the blade to
compensate and have the saw work correctly. It appears that someone
has replaced the motor.
I have been surfing and playing with various connection combos all
morning and have had no luck getting the motor to turn CCW instead of
CW direction.
The motor is a Century CS-68-FH3-3FA 3/4 HP 1750 RPM - 110V/230 that
I'm running at 110V. From the power cord/switch I have a red/black
and green. Reversing R & B have no effect as expected. Had to try.
There are 4 connection posts on the motor connection board. No cover
with schematics. Posts are numbered 1-4.
4 leads come out of the motor for connection to the terminals on the
board 2 black and 2 white. I need to connect these 4 wires and the
power in leads so as to make the motor start in a CCW direction.
I opened the motor and can provide internal connection info if someone
thinks they may be able to help. Most disappear into the windings and
one goes to the centrifigal contacts. Thanks.
db...@sprynet.com
the wires going to the Brushes.............the brush wirings are
incorrect, whoever had the motor probably just reversed the brush wires
by mistake as they look alike and this is what give this ac/dc universal
motor the direction to turn..... hope this helps.
remember that the brush wires come from someplace else in the motor, but
the idea is that the brush wires are connectted wrong, you might just
change them someplace else in the motor and get the same results......
hope this helps.
Jerry Stackhouse
on this motor. I believe that this is a capacitor start motor. There
is s big capacitor on the side and a centrifigal mechanism that
kicks the motor up to speed. Theory is that there is a small winding
to get the motor moving in the proper direction and a second winding
that does the work. Just dont know how to get the thing started in a
CCW direction.
Jerry Stackhouse
of the connections.
On Sun, 18 Nov 2001 19:18:09 GMT, jst...@snet.net (Jerry Stackhouse)
wrote:
Speedy Jim
Century may have a web site (?).
Here are a couple of links that may help understand what you have:
http://www.aosmithmotors.com/08000/Archive/lit1.htm
http://www.metalwebnews.com/howto/elec-mtr/elec-mtr.html
Jim
Mark Kinsler
>> The motor is a Century CS-68-FH3-3FA 3/4 HP 1750 RPM - 110V/230 that
>> I'm running at 110V. From the power cord/switch I have a red/black
>> and green. Reversing R & B have no effect as expected. Had to try.
>>
>> There are 4 connection posts on the motor connection board. No cover
>> with schematics. Posts are numbered 1-4.
>>
>> 4 leads come out of the motor for connection to the terminals on the
>> board 2 black and 2 white. I need to connect these 4 wires and the
>> power in leads so as to make the motor start in a CCW direction.
>>
>> I opened the motor and can provide internal connection info if someone
>> thinks they may be able to help. Most disappear into the windings and
>> one goes to the centrifigal contacts. Thanks.
>If this is a universal motor(AC/DC motor) which most tools use then its
>the wires going to the Brushes.............the brush wirings are
I don't believe that this is a universal motor. 1725 rpm and a
centrifugal switch indicate an AC induction motor. I believe that
most of these can be reversed, but I'm afraid I don't have precise
information on this one. There's probably a starting capacitor on the
motor somewhere, and this is associated with the starting winding and
the centrifugal switch that controls it. One reverses the motor by
reversing the leads to the starting winding.
A motor repair shop might be able to help. Just for the heck of it,
try putting your motor make and model into Google and see if a diagram
comes up. Might work.
Good luck and tell us what happens.
M Kinsler
John McCombs
Switch your capacitor/aux. winding leads.
If it is a dual voltage capacitor start motor, then
L1 L2
low voltage=ccw 1,3,8 2,4,5
(115V.) cw 1,3,5 2,4,8
As you can see 8&5 are the leads you need to find. See how many wires
connect to the capacitor.Should be two, trace them and see where they
go.Note: Watch out for hot cap. leads.
Good Luck
John
"Jerry Stackhouse" <jst...@snet.net> wrote in message
news:3bf7dead...@news.snet.sbcglobal.net...
db...@sprynet.com
maybe this is what happened from the previous owner, when he put it back
together, he put the armature in the wrong way and turned the windings
around and now it seems to run backways, but the armature and the
windings might just be doing its job, he just shifted the winding part
of the motor???? or another thing to look at: does the teeth of the
band saw run back to the table like it is suppose to?? if so then maybe
nothing is wrong with the motor, or like you said that they put the
wrong motor in the saw and thats why they got rid of it????
Rusty
wrote:
>I picked up a band saw and I find the motor is turning the wrong way.
>There is no way to mechanically change the rotation or the blade to
>compensate and have the saw work correctly. It appears that someone
>has replaced the motor.
>
(snip)
Simple. It is a capacitor start motor. Just reverse the wires
going to the start winding and it will start in the right direction.
One of these goes through the centrifugal switch. The other should
be easy to identify.
As someone else said, I suppose the saw blade is mounted with the
teeth cutting downwards! Seems obvious but worth asking.
zxcvbob
I had the same trouble about 15 years ago with a Century dual voltage
motor. I had switched it from 110V to 230V I think. Anyway, the motor
is probably reversible, and you just need to switch two of the wires on
the connection board. The wires going to the field winding, I think?
It's been too long for me to remember without a diagram, but you need to
switch the polarity of one of the two sets of windings.
Best regards,
Bob
Regards,
Bob