Converting my 280synchro to single phase.

graham4877 · Post by **graham4877** » Wed 17 Jun , 2009 20:16 pm

HI pete thanks for this i have got it all working now! forward and reverse all working and the little problem of when i turned the drum for forward and reverse power was coming on! I had put the copper strips and spring upside down ( it fell out when i was putting everything back ) now for the best bit i still have my motor 330/240v 3ph + i have a one off my old boxford lathe the same 330/240v . I have play about with this with a capacitor and have got it stating up and running with lots of torque when i power up still wired in star!? i will post what i do next! ( anyone who is going to do this read what pete has said and take note. and lots of photo's) very easy to get yourself in a mess!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!

Pete. · Post by **Pete.** » Thu 18 Jun , 2009 7:59 am

You're using the boxford motor as an idler for a rotary converter, and startin it on 240V with a capacitor?

graham4877 · Post by **graham4877** » Thu 18 Jun , 2009 17:06 pm

ITS not set up in my lathe yet ? but i will upload a photo of what am doing!! I have attached this off the motor i have bean using its a 240v clarke motor! now will i need 4 wire's form the motor to the switch for f/r?

graham4877 · Post by **graham4877** » Sat 20 Jun , 2009 20:58 pm

this is how i had it

graham4877 · Post by **graham4877** » Sat 20 Jun , 2009 22:51 pm

pete is the top of you single ph motor like this? if so how did you wire it up?

Pete. · Post by **Pete.** » Sat 20 Jun , 2009 22:59 pm

Naw mine was totally different and older. The instructions look pretty simple though. Looks to me you wire up the power to V1 and V2 and use the reversing drum switch to make the fwd/reverse contacts in the diagram below.

graham4877 · Post by **graham4877** » Sat 20 Jun , 2009 23:26 pm

HI pete as in live to v1 then live to v2 then neutral to w1 &u2? anyway i fitted the boxford motor and it vibrates like hell and wont get up to 1400 rmp think its running at 800rpm max! how did you wire out to your motor did you just use the a b c block and have the two neutrals in one?

Pete. · Post by **Pete.** » Sat 20 Jun , 2009 23:33 pm

Isn't your boxford motor a 3-phase jobbie?

Pete. · Post by **Pete.** » Sun 21 Jun , 2009 12:00 pm

Re: the single-phase motor. If I read this drawing right you wire the power
to V1 and V2 (240V mains) via the breaker. Then you wire your drum switch to
connect terminals U2 - V2 / V1 - W1 for forwards, and connect U2 - V1 / V2 - W1 for reverse.

graham4877 · Post by **graham4877** » Sun 21 Jun , 2009 12:10 pm

am giving up with the boxford motor for now! so am trying to get the clarke 240v motor running on the f/r switch !

Pete. · Post by **Pete.** » Sun 21 Jun , 2009 12:14 pm

The boxford 3-phase will never run on 240V without some phase conversion. You can do it with
low-powered motors like suds pumps using a capacitor but not for a drive motor.

First thing you gotta do is map out the contacts of your reversing switch. You need it to be in DPDT
style with U2 and W1 as the poles and V1 and V2 as the throws.

graham4877 · Post by **graham4877** » Sun 21 Jun , 2009 14:25 pm

Hi pete thanks for that but can you tell me it in layman's terms ? thanks

Pete. · Post by **Pete.** » Sun 21 Jun , 2009 15:12 pm

You have to remove the blue reversing switch, and use a tester to find
out which contacts are made when in neutral, forward and reverse to figure
out how to wire it.

graham4877 · Post by **graham4877** » Sun 21 Jun , 2009 19:30 pm

HI pete thanks for that! I just new that i was going to have to do that. was hoping that i did not need to! have just put it back for now and got it running forward with the f/r switch but i am better of now as the lathe looks better with its denford switch's in place now and that's thanks to you! will have ago next week end and will let you know how it go's? thanks pete!! for now. over but not out. ha ha ha

Pete. · Post by **Pete.** » Sun 21 Jun , 2009 20:05 pm

That's cool

What model lathe have you got?

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