Created Date: February 17,2012

Created by: milldrone

I have a T2A-53340-1S transformer. I am trying to get a South Bend Lathe to run.

jlscott,

Welcome to the forum!

What horsepower is the motor?

The motor is a 460 3 phase and no way to re-wire it.

Are you sure about that, I have had many motors rewound by a motor rewind shop to match the voltage I needed.

. I only have 2 phase service.

I doubt that this statement is technically correct. I'm betting that you have 120/240 volt single phase.

. Can I use the T2A-53340-1S to get 460/480 voltage from my 220 single phase service with some kind of VFD or do I even need to use the transformer? Sorry so many ?s... HELP!!!!!!

Before any suggestions can be made we need to know the hp and full load amps of the motor. Also how large is your phaseamatic?

Edit: Can you live with half speed at full torque and full speed at about 1/3 torque?

Created Date: February 17,2012

Created by: jlscott201

?Are you sure about that, I have had many motors rewound by a motor rewind shop to match the voltage I needed.

Rewind would cost $1200 according to a local shop here in Fairbanks, AK

?I doubt that this statement is technically correct. I'm betting that you have 120/240 volt single phase.

Sorry, it is 2 phase 110/220 service... my bad!!

?Before any suggestions can be made we need to know the hp and full load amps of the motor. Also how large is your phaseamatic?

Edit: Can you live with half speed at full torque and full speed at about 1/3 torque?

hmmmm don't know but the owner wants to keep it original as possible..

I guess the phasematic is only rated for no more than 1 1/2 hp because it was originally bought for the Bridgeport but could run up to two machines with no more hp than 1 1/2 hp each...

The motor is a Reliance Duty Master ID# B76P3543M

Specs are:

Serial # 22671-R

Voltage 460

Hertz 60

Phase 3

FLC is 2-0

Wiring Diag. C-60-412814

Cant find any info on the motor because it's probably old and a discontinued model!!!

Hope this helps you and I... Thanks, John

Created Date: February 17,2012

Created by: milldrone

Serial # 22671-R

Voltage 460

Hertz 60

Phase 3

FLC is 2-0

Wiring Diag. C-60-412814

Cant find any info on the motor because it's probably old and a discontinued model!!!

Hope this helps you and I... Thanks, John

Not enough info. The amps or FLC is what we need. "2-0 " is not correct. Can you recheck? Horsepower will work in a pinch.

If you cannot find any info on the motor tag can you get us the details on the motor starter, most importantly the overload heater data?

Created Date: February 17,2012

Created by: sii

A FLC of 2 indicates it's probably a 1.5hp motor. Even taking your location into account you should be able to buy a single phase motor for a couple hundred bucks. Mounting might be a challenge but it seems like a much easier and cheaper route.

There's something to be said for keeping things original but sometimes it doesn't work out that way.

The amps or FLC is what we need. "2-0 " is not correct.

I assumed he meant 2.0. Maybe I was wrong.

Created Date: February 17,2012

Created by: plcnut

You can use the phase converter that you have (if it's big enough) to power the 240v side of the transformer, and then use the 480v output of the transformer to power the lathe. Make sure you put a maximum of a 30 amp breaker or fused disconnect on the 240v side of the transformer, and a maximum of a 15 am breaker or fused disconnect on the 480v side of the transformer, and feed the lathe from it. Please post the hp rating of the phase a matic, it will have to be oversized to be able to start the lathe, and also what hp is the motor on your Bridgeport? You may be able to use it as an idler.

Regards, Jason

Created Date: February 17,2012

Created by: jlscott201

You can use the phase converter that you have (if it's big enough) to power the 240v side of the transformer, and then use the 480v output of the transformer to power the lathe. Make sure you put a maximum of a 30 amp breaker or fused disconnect on the 240v side of the transformer, and a maximum of a 15 am breaker or fused disconnect on the 480v side of the transformer, and feed the lathe from it. Please post the hp rating of the phase a matic, it will have to be oversized to be able to start the lathe, and also what hp is the motor on your Bridgeport? You may be able to use it as an idler.

Regards, Jason

I will post the schematics on the transformer if it will help. How do you get a 3phase transformer to put out 3 phase if you only have a 2 phase service. The phase converter just cycles on and off very fast when you hook "B " to any of the 3 primary leads of the transformer..

Created Date: February 17,2012

Created by: jlscott201

Without getting into an argument about your "two phase service " I will try to answer your question.

lol Sorry I ment to say single phase service (brain poot).. I will do some research and I agree totally with your answers... Thanks very much, John

You said "Edit: If it were me I would retrofit a "T " frame even if the old was a "U " frame because "U " frames are more money and obsolete. When I add a VFD to an existing multispeed setup I generally size the motor larger so that the torque multiplication can be offset by a larger motor. "

I take it that it "T " or "U " frame is the mounting of the motor?? The motor that is on the lathe is a 145T "frame " if I am on the same page with the "frame " thing... sorry to bother you again. Which VFD model would you suggest? The motor is a 1 1/2 hp and we are planning on replacing it with no less than original hp. Another question I have is, IF we use a VFD does it cancel out all the original controls on the lathe ie pushbutton start, reverse, forward, fast, slow?