LumberJocks

Rotary Phase Converter

  • Advertise with us

« back to Power Tools, Hardware and Accessories forum

Forum topic by Binn posted 08-20-2010 05:09 PM 3616 views 0 times favorited 13 replies Add to Favorites Watch
View Binn's profile

Binn

92 posts in 2421 days


08-20-2010 05:09 PM

Can anyone tell me what you would recommend or have experience using Rotary Phase Converters?
I bought a Grizzly 10hp 3phase table saw and I need a phase converter , I am inquiring about 2 manufactures ; Kay Industries and Phase-A-Matic converters.
Does anyone own or use these?
8/20/2010

-- Barry, Louisiana


13 replies so far

View TopamaxSurvivor's profile

TopamaxSurvivor

17676 posts in 3143 days


#1 posted 08-20-2010 06:36 PM

Get a Variable Frequency Drive, it will be much better amd less expensive than a phase converter. Search this site for the name of a company that others have had good luck with.

-- Bob in WW ~ "some old things are lovely, warm still with life ... of the forgotten men who made them." - D.H. Lawrence

View Binn's profile

Binn

92 posts in 2421 days


#2 posted 08-20-2010 07:41 PM

Thanks guy’s for your help, I am going to check into these options.

-- Barry, Louisiana

View Elksniffer's profile

Elksniffer

93 posts in 2864 days


#3 posted 08-20-2010 07:46 PM

I installed an Allen Bradley VFD (Power Flex) on a 3 phase lathe motor and it works great.
It was simple to wire in, rated for a couple more HP than I needed, makes a faint buzzing noise and has all the power I need.

View TopamaxSurvivor's profile

TopamaxSurvivor

17676 posts in 3143 days


#4 posted 08-20-2010 07:59 PM

I should metin there is a small chane the VFD will trip out on short circuit if it is not a VFD rated motor. I doubt that it is in a older saw. Yoiu could check this with a high voltage megger. If it doesn’t read at or near infinity, you may have problems using the VFD. In that case, use a rotor-phase.

-- Bob in WW ~ "some old things are lovely, warm still with life ... of the forgotten men who made them." - D.H. Lawrence

View extremehobbiest's profile

extremehobbiest

42 posts in 2453 days


#5 posted 08-20-2010 11:10 PM

I have a Kay converter and it is a very good machine with excellent customer service. Phase-a-matic is also good. With a 10HP saw motor, I wouldn’t choose a VFD for use as a phase converter.

Another option is the Phase Perfect which is a digital unit. I know of several folks that rave about this one. It is expensive though.

One thing to watch out for is the HP ratings that some manufacturers use. When Kay sells you a 10HP phase converter, it will start a 10HP motor. This is not the case with all manufacturers so do your research and talk to the sales engineering folks. If they are not asking you what type of machine you want to run and ask your machine details, start looking elsewhere.

View John Ormsby's profile

John Ormsby

1283 posts in 3204 days


#6 posted 08-20-2010 11:49 PM

I also have a Kay converter. They are excellent. I also installed what is called a Buck/ Boost transformer to balance out the voltages on the three legs. They are now within =/- 1 volt of each other. This is necessary thing when running machines with a lot of electronics on them.

-- Oldworld, Fair Oaks, Ca

View TopamaxSurvivor's profile

TopamaxSurvivor

17676 posts in 3143 days


#7 posted 08-21-2010 02:27 AM

rick3ddd, I just mentioned that because there is a small chance the insulation in an older motor will not hold up to the high switching frequency of many drives. If the drive trips out on ground fault when it is installed, that is most likely the problem. I would not expect a lay person to get a high voltage meggar and start testing. A used one will be $1200-1500!! :-)) Most electricians are at a loss as what to do with it or what it is really telling them :-((

If it trips on ground fault, that is most likely the problem . You will have a hard time finding someone to trouble shoot it. The drive customer service may be able to help unless they are phone people reading off a screen. Most electrician wil be clueless. I just thought I’d mention the possibility for info sake and incase it happens.

On a job I was recently on, an old motor would not work with the new drive conversion. The 30 something electrician didn’t have a clue. The 30 something drive tech wasn’t too sure, neither knew how to test the problem. The meters they were carrying didn’t tell them anything. Unfortunately, that is the way it is out there in electric land these days. If you tell the customer they need a new 25 hp 3 phase motor or the $4k drive they just bought isn’t any good, it is spendy and embarrassing to be wrong :-))

-- Bob in WW ~ "some old things are lovely, warm still with life ... of the forgotten men who made them." - D.H. Lawrence

View Binn's profile

Binn

92 posts in 2421 days


#8 posted 08-21-2010 04:09 AM

Hey guy’s slow down a bit, I know my wood but I know nothing about electricity and don’t want to know. I leave that to the experts, but anyway topamx my saw is almost new was purchased Nov.09.
I talked to Ed Fry w/ electricmotorswarehouse today and he said I might not be able to use a VFD because of the computer electronics in the ele. panel. He mention some things but first he needs the wiring diagram of the saw.
I’ll let him or others figure it out, all I want is the best cheapest way of connecting this machine so I can go to work.
This is a grizzly G0501 10hp 3 phase slider panel saw. Kay Industries wants $1750.00 and Phase-A-Matic wants $1956.00, the previus saw owner uses the phase-a-matic for his machines and recommends them.

-- Barry, Louisiana

View Michael Murphy's profile

Michael Murphy

452 posts in 2472 days


#9 posted 08-21-2010 04:33 AM

I have a rotophase 5 hp phase converter and have been using it for about 30 years with NO trouble at all. I bought it used for about $150.00. It starts my 3 hp unisaw and 5 hp 3 phase compressor all the time, no problem, with the saw running the compressor still can kick in. I have had other 3 phase equipment come and go and it seems to work with them all. The rating is supposed to be what it is rated to start.

If you are buying a 10 hp saw you are in a league above most of us here on LJ. I was a professional Cabinetmaker for 20 years and never had a motor over 7.5 hp and that was a sander. I would be afraid of a 10 hp saw. There is such a thing as too much power for the application.

-- Michael Murphy, Woodland, CA.

View TopamaxSurvivor's profile

TopamaxSurvivor

17676 posts in 3143 days


#10 posted 08-21-2010 05:22 AM

I haven’t delt with Grizzley electronics, but welders have been a little picky in the past :-)) I doubt if the electronic baords are going to like the switching trying to fool them into thinking there is the proper 3 phase voltage. Motor winding don’t seem to mind if thery have teh proper insulaion. I would suggest a rotary vs an electroinc rotophase if you have electronic controls down stream. Good luck.

-- Bob in WW ~ "some old things are lovely, warm still with life ... of the forgotten men who made them." - D.H. Lawrence

View makfin's profile

makfin

3 posts in 2252 days


#11 posted 10-11-2010 02:56 AM

This is an easy one check out www.phaseconverterspecialist.com they can take care of you and its a simple two wires in and three wires out. Ya they make it that easy.

View Binn's profile

Binn

92 posts in 2421 days


#12 posted 10-15-2010 05:00 PM

Makfin have you bought or used this companies phase converters?

-- Barry, Louisiana

View makfin's profile

makfin

3 posts in 2252 days


#13 posted 10-15-2010 06:26 PM

My company purchases them and I install them for farmers in the area. I like the simple hookup and durability of their system. Their web site is user friendly and has a contact page where you can tell them what you need. We order our systems and get them in about two weeks.

Have your say...

You must be signed in to reply.

DISCLAIMER: Any posts on LJ are posted by individuals acting in their own right and do not necessarily reflect the views of LJ. LJ will not be held liable for the actions of any user.

Latest Projects | Latest Blog Entries | Latest Forum Topics

HomeRefurbers.com