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Any electricians use to the old two way capctior motors

Posted: Wed May 11, 2016 3:06 pm
by goldhunter_2
:banghead: Is there any electricians that is used to wiring the old two lathe motors that use a single capacitor and a 6 way frunas drum switch :dontknow: :dontknow: :dontknow:

It runs fine in reverse (has for years) but forward it wasn't working I changed some wire so now the switch makes it go bot forward or reverse ...... worked fine yesterday :banghead: this morning when I put it in forward motor hums like its stuck , I can hand spin it to get it started and runs until I put a load on it then motor slows down and starts smoking

I am pretty sure it not always starting to spin in forward is "probably" a bad capacitor but not sure if a capacitor would effect it once its spinning and gets a load to bog motor down , I could use some knowledgeable insight form someone

I guess the real question did I wire something wrong or can a bad capacitor cause both issues?????

Re: Any electricians use to the old two way capctior motors

Posted: Wed May 11, 2016 3:08 pm
by goldhunter_2
couple more reference photos

Re: Any electricians use to the old two way capctior motors

Posted: Wed May 11, 2016 4:31 pm
by TheElevatorGuy
Bad cap for sure!

Re: Any electricians use to the old two way capctior motors

Posted: Wed May 11, 2016 4:58 pm
by digginfool
TheElevatorGuy wrote:Bad cap for sure!
How can you be so sure? 8) I know you know this crap better than me but the caps should be for mitigating startup surge. Once the motor is up and running, it should be able to maintain, assuming no additional load than normal. I would lean more towards bad windings (obviously no dead short but not a full field being developed) or possibly even brushes? What do you think?

Re: Any electricians use to the old two way capctior motors

Posted: Wed May 11, 2016 5:10 pm
by goldhunter_2
The load is the same as normal. I can still turn it on to reverse and run the lathe with a load (cutting material) but if I stop an change to forward it is as described above so I don't think anything is wrong with winding.

I'm going to get some help to pull lathe back out so I can get Capacitor off to order a replacement , just hope that's the issue.

Re: Any electricians use to the old two way capctior motors

Posted: Wed May 11, 2016 5:23 pm
by digginfool
goldhunter_2 wrote:The load is the same as normal. I can still turn it on to reverse and run the lathe with a load (cutting material) but if I stop an change to forward it is as described above so I don't think anything is wrong with winding.

I'm going to get some help to pull lathe back out so I can get Capacitor off to order a replacement , just hope that's the issue.
When you changed the wiring, did the function of the switch change or stay the same? That is, was forward still forward and reverse was still reverse or opposite?

Re: Any electricians use to the old two way capctior motors

Posted: Wed May 11, 2016 6:00 pm
by goldhunter_2
Welllllllllllllll when I wired the drum switch 8-9-10?? years ago it only ran Reverse an worked fine for the stuff I was doing until now, that's the way I called "original" on my wiring diagram . In the original wiring Forward & Neutral where both "off"-- so I basically had the switch wired wrong originally. The re-wired switch wiring diagram you can see I swapped the orange and white wire , now all three work F-N-R

Re: Any electricians use to the old two way capctior motors

Posted: Wed May 11, 2016 6:53 pm
by TheElevatorGuy
Replace the cap and call it a day......15 yrs of working with all sorts of electrical motors is what tells me so Mr. Diggin!

Re: Any electricians use to the old two way capctior motors

Posted: Wed May 11, 2016 6:59 pm
by swamp_fever
You need to wire it back like it was then to change the rotation reverse the line one and line two supply line to change rotation
according to the wiring data plate on the back of the motor

Re: Any electricians use to the old two way capctior motors

Posted: Wed May 11, 2016 7:00 pm
by digginfool
That's right, hamster dong. It's Mr. Diggin to you and don't you forget it.

Re: Any electricians use to the old two way capctior motors

Posted: Thu May 12, 2016 7:25 am
by Gary S
Temporarily wire motor ro run forward with no switch. You are using same windings and same start cap in both directions. Only thing different is the switch.

Re: Any electricians use to the old two way capctior motors

Posted: Thu May 12, 2016 9:11 am
by PeaRiverOpossum
Kinda half way read all the details but if your caps have the same ratings why not swap them out and see if the problem follows the bad suspected CAP. Just mark them before you start....speaking from experience there...LOL

Re: Any electricians use to the old two way capctior motors

Posted: Thu May 12, 2016 12:07 pm
by goldhunter_2
PeaRiverOpossum wrote:Kinda half way read all the details but if your caps have the same ratings why not swap them out and see if the problem follows the bad suspected CAP. Just mark them before you start....speaking from experience there...LOL
This is only a single Cap motor

Re: Any electricians use to the old two way capctior motors

Posted: Thu May 12, 2016 12:12 pm
by goldhunter_2
Gary S wrote:Temporarily wire motor ro run forward with no switch. You are using same windings and same start cap in both directions. Only thing different is the switch.
This is the only configuration that I have gotten Forward, if you see something I should have wired differently in the diagram let me know. If memory serves me these caps aren't used like a modern start cap they have something to do with reversing the rotation ...I could be wrong , it could be my wring or a bad cap

Re: Any electricians use to the old two way capctior motors

Posted: Thu May 12, 2016 6:12 pm
by jimbo_jwc
They usually switch the starting windings in relation to the run windings hooked parallel with the lines .

Re: Any electricians use to the old two way capctior motors

Posted: Thu May 12, 2016 6:38 pm
by jimbo_jwc
Here is one if A n B are the lines 1 n 2
1 n 3 are the run windings
2 n 4 would be starting windings, switch and capacitor

Check to see if your switch make the connections shown

Re: Any electricians use to the old two way capctior motors

Posted: Fri May 13, 2016 7:25 am
by Gary S
If it runs fine in reverse if should run fine in forward. You are using the same windings either way. I would suspect there are some contacts in the the reversing switch that are going bad.
Or as Jimbo said something is wired wrong.