3 phase machines

[aleksandar.neshev]

I've got a pretty good deal on 

2 juki Ls 1342-7 machines 

Fully automatic features, unfortunately 3 phase configuration 

 

 

Do I need 2 Rotary converters to run both of the machine or 1 ?

 

[CdK]

You can use a VFD (variable frequency drive) to convert single phase to 3 phase.

[Tigweldor]

Hi,

Jup - a VFD is the way to go in your case.

Just remember though - in Europe most all 3-phase motors run on 380 Volts.

But you can change their configuration so they run on 220 Volt 3-phase.

If you want to run a VFD from 220 Volt sigle phase - you will have to also adapt to 220 Volt 3-phase which means that you have to re-arange the brass bars in your wiring different.

Wiring for 380 Volts will have the bars connecting U and V and W connected to each other in line.

To run 220 Volts you have to connect R to U and S to V and T to W.

Only takes a 1/4 inch drive ratchet with a 7mm socket/nut. 

Best ya get someone to show ya how it´s done properly.

VFDs from Chinesistan ya can buy via EBAY for around 80€ - best buy one that exceeds the current draw of the motor.

Greetings from Germany

Tigweldor

Edited 16 hours ago by Tigweldor

[friquant]

On 11/19/2025 at 4:28 PM, aleksandar.neshev said:

Do I need 2 Rotary converters to run both of the machine or 1 ?

I'm assuming you only need one. And as others have said, VFD is a convenient electronic solution to get 3-phase.