Re: Converter Trouble

Did it and it works now.
Thanks Stan

Scott




--- In CAD_CAM_EDM_DRO@yahoogroups.com, "STAN MCDONALD"
<SMCDONAL@K...> wrote:

> You want to use a 5 hp for the rotary converter then use 30 if per

hp run

> and 60uf per hp start i just used a light switch to add the start

caps. i

> turn the light switch on then turn on the converter and when it gets

up to

> speed i turn off the light switch.
> that was my ez way to do it. I would not use a self starting

converter. my

> way works and a light switch is cheep.
>
> hope that helps
> regards
> s
>
>
> -------Original Message-------
>
> From: Polaraligned
> Date: 05/21/05 07:31:57
> To: CAD_CAM_EDM_DRO@yahoogroups.com
> Subject: [CAD_CAM_EDM_DRO] Re: Converter Trouble
>
> Thanks Stan,
> I am trying to do the self starting converter as shown here:
> http://www.metalwebnews.com/howto/ph-conv/fig7.html
> It shows no start capacitors just 25 to 30 uF per HP run
> caps. According to the text, it will start by itself without
> any additional start circuit. And yes, just throwing 120uF
> between L1 and L3 instantly started my bridgeport 2HP, so the
> circuit DOES work,it just won't get the 5 HP going. Maybe I need a
> higher capacitance,but I am using the values the text recommends.
> I am trying to do this dirt cheap as it is only a temporary setup.
> I have already spent $80 on these run capacitors and really don't
> want to buy another. A start cap in the size you recommend is $10, so
> maybe I will try it. Any other ideas?
>
> Thanks,
> Scott
>
>
>
> --- In CAD_CAM_EDM_DRO@yahoogroups.com, "STAN MCDONALD"
> <SMCDONAL@K...> wrote:
> > put another cap from L1 to L3 of 300uf and click it in just to get
> the motor
> > up to speed and it will work.
> > Regards
> > s
> >
> >
> > -------Original Message-------
> >
> > From: Polaraligned
> > Date: 05/20/05 19:45:35
> > To: CAD_CAM_EDM_DRO@yahoogroups.com
> > Subject: [CAD_CAM_EDM_DRO] Converter Trouble
> >
> > I am just a sap for old electronics. I think it is the greatest
> > thing that my newly aquired BOSS 4 uses an LSI 11 and lots of
> > 74xxx logic. So for my sanity, I really need to run this machine
> > before I convert it to modern controls. I am trying to do this
> > as inexpensive as possible. I have a 5HP motor that I am trying
> > to use as a rotory converter. I have connected 240v to L1 and L2
> > and used between 120 uF and 170 uF, run capacitors, from L1 to L3.
> > The motor refuses to start. It barely spins with 120 uF and spins
> > slowly with 170 uF. If I leave it on too long, the motor heats up
> > and you can smell the winding enamal burning. According to
> > http://www.metalwebnews.com/howto/ph-conv/ph-conv.html this should
> > work as a self starting phase converter. Yet the motor won't run. I
> > haven't even tried to hook it up to the machine. I figure I
> > should get the motor running first, then hook it up to the machine.
> > What is weird is that my Anderson 1 to 3 Hp static phase
> > converter fires this motor right up. I just can't keep it running

long

> > because the Anderson looses a bit of the magic smoke because the 5 HP
> > motor is too big for it. So what is special about the Anderson
> converter
> > that it fires this motor right up, yet I can't get it moving with my
> > run capacitors? What am I missing?
> >
> > Thanks,
> > Scott
> >
> >
> >
> >
> >
> >
> >
> >
> >
> >
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> http://www.metalworking.com/news_servers.html
>
> http://groups.yahoo.com/group/jobshophomeshop I consider this to be a
> sister site to the CCED group, as many of the same members are

there, for OT

> subjects, that are not allowed on the CCED list.
>
> NOTICE: ALL POSTINGS TO THIS GROUP BECOME PUBLIC DOMAIN BY POSTING

THEM.

> DON'T POST IF YOU CAN NOT ACCEPT THIS.....NO EXCEPTIONS........
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> List Owner
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