how do you run capacitor start ac motor in reverse


M

Mike_in_SD

I have a couple of shop projects where I need to reverse a
110v capacitor start ac motor ..

whats the simplist way to do this ..

tia
mike
 
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R

RBM

If the wiring is accessible to reverse the motor, there should be a diagram
on the motor or inside the splice box to show you which wires to switch
 
M

Mike_in_SD

rbm2(remove this)@optonline.net (RBM) wrote in
If the wiring is accessible to reverse the motor, there should be a
diagram on the motor or inside the splice box to show you which wires to
switch
thanks .. ill look

mike
 
M

maradcliff

rbm2(remove this)@optonline.net (RBM) wrote in


thanks .. ill look

mike
If there is a shaft on both ends? Just use the other end.
Unfortunately thats seldom an option.
 
G

gfretwell

(e-mail address removed) wrote in <[email protected]
4ax.com>:



no .. its on my drill press

I never thought of that. Drill a hole in the wrong place and all you
have to do is run the motor backward to fill it back in?
.... sorry I couldn't resist

In reference to your motor, a reversable motor has 2 identical
windings wound out of phase about 90 degrees. The L1 goes to the
common point between them and you either hook the capacitor or line 2
to the other ends of the windings (one each) The winding that is L1/L2
is the run winding and the one that runs through the capacitor is the
start. There is usually a switch in there to disconnect the capacitor
when the motor gets up to speed.

There are lots of kinds of motors so you need to know what you have
before you start swapping stuff around.
 
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M

Mike_in_SD

Use left-handed drill bits.

People should always say why they are asking a question.

oh .. I dont know .. it was a pretty simple question. I am a shop nut
working on my shop more than on projects. There are potentionally lots
of hacks to my equipment that could benifit from this knowledge.

I guess if you dont know the answer, you can always be funny.

or not
 
M

mm

oh .. I dont know .. it was a pretty simple question. I am a shop nut
working on my shop more than on projects. There are potentionally lots
of hacks to my equipment that could benifit from this knowledge.
Not sure I understand. Are you saying there are a lot of people who
could benefit from knowing how to reverse a motor? I'm sure there
are.

But people should always say why they are asking a question (unless
there is a good reason not to ;-) ), because there may be more than
one path to a solution, like here.
I guess if you dont know the answer, you can always be funny.

or not
The joke's on you. I wasn't trying to be funny. Apparently you don't
know about left-handed drill bits. I guess if you don't know enough
to understand the answer, you can always be sarcastic.

Instead of asking me or someone if LH drill bits exist.


I'd email you in case you're stopped reading this thread or this ng by
now, but you don't give your email addrss.
 
M

mm

Actually LH drill bits wouldn't work. My mistake.

But I think the rest of my last post was still on target, since I
think your reply was based on your idea that they don't exist.
 
M

Mike_in_SD

Sorry mm, you dont get to make the rules.

Its like guys that cry about top posting (which you did)

I can see their argument .. but .. I can give you a counter argument
that is just as valid. So sometime I top post and sometimes I
bottom post.

What you are doing by wanting to know WHY .. is trying to decide
if I actually NEED to reverse this motor. Think about that ..
slightly insulting in itself.

And as you can see by your attempt at an answer .. the only thing
that will work is ... reversing the motor

thanks to the guys that actually answered my question.

Mike
 
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M

mm

Sorry mm, you dont get to make the rules.
Oh, please. You're calling it a rule. I never did. But people
*should* always say why they are asking a question, if only because
they stand a better chance of getting an answer that will solve their
problem, and if someone cares about other people, secondly, because it
often keeps people from wasting their time giving answers that apply
to the question as phrased, but don't have anything to do with what
the OP is trying to do. Maybe you don't care if people here waste
their time, or you think that even if it's relevant, someone will
benefit from it.

Maybe someday** we'll take a survey of how many people answer
questions and feel they've wasted time when the OP left out something
that, had it been included, they would have given different advice.

**It would have to be a new thread. I'm sure most people have stopped
reading this one.
Its like guys that cry about top posting (which you did)
By pointing this out, when I hadn't said a word about it, you are the
one crying about top posting. So I guess you're a lot like your view
of me.

Even in this one thread one can see that I normally bottom post, and
most people could figure out that I top posted in this one case
because I wanted to make SURE you saw my statement that LH drill bits
didn't work. I wasn't addressing anything in your previous post that
I hadn't already addressed in my first reply to it, which you had just
read.
I can see their argument .. but .. I can give you a counter argument
that is just as valid. So sometime I top post and sometimes I
bottom post.
Well good for you. You seem like me in this regard, so why did you
bring up the subject and why are you still at it? This has nothing
to do with this thread or our arguing about people saying why they are
asking a question.
What you are doing by wanting to know WHY .. is trying to decide
if I actually NEED to reverse this motor. Think about that ..
slightly insulting in itself.
And you take that personally? How many people post here wanting to do
something when they should be doing something else? Lots. How do I
know you're not one of them? I don't know.

But here is something you can take personally, and feel insulted: In
this thread you've written like an insecure jackass.
And as you can see by your attempt at an answer .. the only thing
that will work is ... reversing the motor
I don't know that is the only thing that will work. You still haven't
said what you are trying to do.

I just know the LH drill bits won't work, and that's not because of
your particular situation. I reverse my drill when I use left-handed
drill bits and I forgot that.

And it doesn't change what I said. People should always say why they
are asking a question.
 
G

George

I have a couple of shop projects where I need to reverse a
110v capacitor start ac motor ..

whats the simplist way to do this ..

I did this when I was a kid, which is getting to be a long time ago.
IIRC, you have to reverse the relative phase of the start and run
windings.

My recollection is that I used a 4PDT switch; but, thinking about it
now, it's not clear why. It seems like you could just leave one winding
unswitched, and use a DPDT to reverse the other. Maybe I was using it
for an on/off switch, too? Maybe my mind is gone.

George
 
M

Mike_in_SD

(e-mail address removed) (George) wrote in
I did this when I was a kid, which is getting to be a long time ago.
IIRC, you have to reverse the relative phase of the start and run
windings.

My recollection is that I used a 4PDT switch; but, thinking about it
now, it's not clear why. It seems like you could just leave one winding
unswitched, and use a DPDT to reverse the other. Maybe I was using it
for an on/off switch, too? Maybe my mind is gone.

George

I know I have used 4pdt relays on dc motors, kind of like a
mechanical H bridge ... for some robot platforms I have build
but .. not sure how to apply here.

somebody suggested that if I take the plate off where the
main ac comes in that, there should be a diagram there to
describe reverse operation. I think that may be my best bet.

thanks for the reply
mike
 
G

gfretwell

I know I have used 4pdt relays on dc motors, kind of like a
mechanical H bridge ... for some robot platforms I have build
but .. not sure how to apply here.

somebody suggested that if I take the plate off where the
main ac comes in that, there should be a diagram there to
describe reverse operation. I think that may be my best bet.

These may help

http://www.metalwebnews.com/howto/elec-mtr/elec-mtr.html

Look at the last couple pages here
http://www.hubbell-icd.com/icd/drum/files/Catalog 4258 Drum Controllers.pdf
 
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B

Bud--

For the reversing function a 4-way switch - as used in lighting circuits
- could be used. Start winding to one pair of terminals, connection to
rest of motor to the other pair of terminals (or whichever pair of wires
shown in the motor diagram). A 4-way switch gives you straight through
in one position and crossed-through in the other position.

bud--
 
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M

Mike_in_SD

(e-mail address removed) (Bud--) wrote in
For the reversing function a 4-way switch - as used in lighting circuits
- could be used. Start winding to one pair of terminals, connection to
rest of motor to the other pair of terminals (or whichever pair of wires
shown in the motor diagram). A 4-way switch gives you straight through
in one position and crossed-through in the other position.

bud--

Thanks guys .. thats some good info

mike
 

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