Unisaw LVC/Magnetic Switch

[Monte Strating]

I recently purchased a 1980 Unisaw. It came with a 3 hp, 3 phase motor. I have purchased a 3 hp single phase 220 Leeson motor. The LVC needs to be reworked for the change from the 3pase to 1 phase. I know I have to install the correct size heaters for the new motor. What other wiring modification needs to be done? :confused:

[Darcy Warner]

Should be a starter wiring diagram on the back of the starter cover

[Monte Strating]

There is a diagram for 3 phase but not for single phase. I believe the LVC will work but with some modification.

[Darcy Warner]

I am used to seeing a diagram for single phase hook ups as well on most older starters.

[mark kosse]

Mine had info for both single and three phase. Unfortunately, I'm nowhere near my saw.

[Rod Sheridan]

The contactor may not be rated for a 3HP motor single phase.

Check the ratings before spending money.
money, obviously check the coil voltage as well.

[Monte Strating]

Here is a pic of the cover on the LVC.

352439

[David L Morse]

Looks like a simple wiring task. Connect your motor to T1 and T2.

Connect the single phase 240V to L1 and L2.

There is nothing to connect to T3 or L3.

Make sure the transformer is using the 230V tap.

You should be able to go ahead and use the saw with the lower current heaters until you get the proper ones. The worst that might happen is nuisance tripping if you do some heavy cutting.

[Monte Strating]

Looks like a simple wiring task. Connect your motor to T1 and T2.

Connect the single phase 240V to L1 and L2.

There is nothing to connect to T3 or L3.

Make sure the transformer is using the 230V tap.

You should be able to go ahead and use the saw with the lower current heaters until you get the proper ones. The worst that might happen is nuisance tripping if you do some heavy cutting.


Installed the new motor. Wired as described above. Saw runs great. Just need to get heavier rated heaters and install them. Thanks for all the help from everyone.