120v from 3 Phase 240v

[Toby Jutras]

Anyone have experience taking 120v power from a 3 phase 240v CNC machine?

I know you are not supposed to use the ground as a neutral, but unclear on my options. I’m trying to power the spindle chiller (120v) from the machine.

I can get the 120v I need through one of the hot legs and ground.

Thanks

[Greg Funk]

Simplest solution would be to use a 240 to 120V transformer off of 2 of the legs.

I don't think there's any guarantee that the nodes of your 3-phase power are equidistant from ground.

[Scott T Smith]

Simplest solution would be to use a 240 to 120V transformer off of 2 of the legs.

I don't think there's any guarantee that the nodes of your 3-phase power are equidistant from ground.

^^^^ This

[Gary Campbell]

Simplest solution would be to use a 240 to 120V transformer off of 2 of the legs.

I don't think there's any guarantee that the nodes of your 3-phase power are equidistant from ground.

+ 1 to this advice

[Wes Grass]

I added a 240-208 transformer for a CNC. Seems to me there was a wiring option that created a neutral on the output side for 120? Is that correct? Still kinda baffles me how that would work.

[Bill George]

Never tap one leg to ground off 3 phase, only use a neutral wire.

[Greg Funk]

Never tap one leg to ground off 3 phase, only use a neutral wire.240V service typically doesn't have a neutral.

[Bill George]

240V service typically doesn't have a neutral.

The 208 ones do, people get confused 208-230 3 phase etc, all a big mystery. In any event using the ground as neutral is not allowed nor safe.

[Greg Funk]

The 208 ones do, people get confused 208-230 3 phase etc, all a big mystery. In any event using the ground as neutral is not allowed nor safe.208V 3-phase is normally a Y configuration with a neutral. 240V is normally a Delta with no neutral. Agree about not using ground for neutral.