[PIVOTALCUSTOMS]

Hello,

Looking for suggestions to get single phase 220v for my servo drives as well as 110v single phase for the PC running the machine.

Any suggestions are appreciated!

Thanks

[Jim Dawson]

Assuming you are in North America, what is your 3 phase voltage? 208, 240, 480? There is no 220V in North America.

I'm splitting hairs here because each case is different. See here https://ctlsys.com/support/electrica..._and_voltages/

[PIVOTALCUSTOMS]

Assuming you are in North America, what is your 3 phase voltage? 208, 240, 480? There is no 220V in North America.

I'm splitting hairs here because each case is different. See here https://ctlsys.com/support/electrica..._and_voltages/

Will likely be 240v from an American rotory phase converter.

[machinehop5]

https://ctlsys.com/support/electrica..._and_voltages/ read it twice..testing soon

[Eldon_Joh]

you likely do not need 120vac for your computer. many are 100-260vac, they take the incoming ac and convert it to 400 volts dc.

the older computer power supplies have a switch you need to set for 120/240 operation. get it wrong and it blows up.


you will need a transformer if you really do need 120 from from a 240v source.

in the case of your rotary phase converter you have 120vac from line 1 and 2 to neutral. line 3 will read 208 volts to neutral. you can buy a 5 pin plug to handle that correctly but there is no guarantee that everyone has 120v line to ground on two of the phases. it could be 138 on all three phases, or it could be 120/208 for high leg delta (electrically a rotary phase converter and high leg delta is the same thing) so if your machine ever gets plugged into someone else's system there is no guarantee they had it wired up the same way, so there is a 1 in 3 chance you end up sending 208 into your 120v system.

corner grounded delta won't have a neutral so there is no chance of your machine ever being plugged into that if you wire it up with a 5 pin plug.

nema L21-20R for example.

i'm not aware of plugs specifically for high leg delta (aka center tapped delta)

[ger21]

Will likely be 240v from an American rotory phase converter.

Do you have single phase 240V available directly? If so, just run a 4 wire cord like a dryer cord, which will give you both 120V and 240V.

[mactec54]

Will likely be 240v from an American rotory phase converter.

The RPC most likely will smoke the servo drives, servo drives in general don't like RPC's a lot of servo drives will run on 220/240v single phase so what do you have for servo drives

[machinehop5]

Attachment 419896 scr test jig ...need help to wire
How to test an SCR - Electronic Circuits and Diagrams-Electronic Projects and Design
roadmap

[Jim Dawson]

You need the RPC to run your spindle? And if that's the case, why are you using single phase servo drives?

But, coming off of the RPC you have the two normal single phase hot legs and the manufactured leg. I would use a 240/120 transformer across the 240 legs to derive the 120V, or power the computer from a completely separate circuit so you can use it without the RPC running. This is the way my lathe is set up.

Since you're using single phase servo drives, also make sure they are wired to the 240V hot legs and not to the manufactured leg from the RPC.

[machinehop5]

Hello,

Looking for suggestions to get single phase 220v for my servo drives as well as 110v single phase for the PC running the machine.

Any suggestions are appreciated!

Thanks

Call a Pro...maybe Maytag repairman local

[PIVOTALCUSTOMS]

Sorry I mis-spoke, I am actually going to be using the PT-355 from Phase Perfect. I was originally looking at the ARC but the phase perfect seemed a much better application for the CNC.

Anyhow, My retrofit has two single phase 220 Servo Drives on X and Y and a 220 three phase on the larger Z axis. The spindle Drive is also three phase.

The PT-355 describes its output as follows:

The converter shall be based on a double-IGBT conversion design, rectifying the
incoming AC power to DC, then generating a third AC voltage which is added to
the two legs of the single-phase service, producing balanced three-phase power
in a closed delta configuration with a center-tap ground between two of the legs.

This is where Im a bit unsure, I considered pulling a leg for 110 like i have done in the past on the RPC but i wasn't able to find alot of info on a Closed Delta Config, so im unsure if thats doable?

If not is there a transformer config that can go 3 phase to 220 with neutral?

Thanks for the info and sorry for the hasty post and lack of info.

[Jim Dawson]

Well that changes things a bit. I think it's time for a chat with Phase Perfect tech support. Reading through the manual it looks to me like 120V could be derived from one leg to neutral, but I'm having a bit of a hard time getting my head around exactly what it says. Same with using two legs as a 240V single phase output, it seems like it would work but I'm not sure. I would prefer that they show a diagram of the wiring for those configurations. Like I said, talk to tech support for a real answer.

Look at the Three Phase Four Wire Delta diagram from the link I posted above.

[PIVOTALCUSTOMS]

Thanks Jim,

I will definitely give them a call tomorrow, thats where I was at as well but I wasn't sure if that was just due to my more limited understanding of all of this or if there documentation wasn't 100% clear.

I will report back with their answers.

[mactec54]

You need the RPC to run your spindle? And if that's the case, why are you using single phase servo drives?

But, coming off of the RPC you have the two normal single phase hot legs and the manufactured leg. I would use a 240/120 transformer across the 240 legs to derive the 120V, or power the computer from a completely separate circuit so you can use it without the RPC running. This is the way my lathe is set up.

Since you're using single phase servo drives, also make sure they are wired to the 240V hot legs and not to the manufactured leg from the RPC.

He would need a Neutral wire to get 120v supply from the 240v source

Depending on what size his spindle Hp is he may not need a RPC for his machine at all, so he needs posts what his spindle requirement's are and does it have a VFD Drive

[PIVOTALCUSTOMS]

He would need a Neutral wire to get 120v supply from the 240v source

Depending on what size his spindle Hp is he may not need a RPC for his machine at all, so he needs posts what his spindle requirement's are and does it have a VFD Drive

The spindle motor is a 5.5 kw 3phase servo spindle motor running a 3 phase pulse/direction drive.


The servo for my z is also a dedicated 3phase drive.
So as far as I can tell 3 phase is required.

So after chatting with Phase Technologies the output is closed Delta 3 wire phase to phase 1% voltage with on leg being high phase to ground...

The 220v servo drives are currently running 2 hot legs of 220v service no neutral in my test setup( the inputs are designed for oversees power 1 hot 220v leg 1 neutral)

So could I in theory just run those from 2 low legs to ground with 220v between phase?

That just leaves me with the 110v issue

[mactec54]

The spindle motor is a 5.5 kw 3phase servo spindle motor running a 3 phase pulse/direction drive.


The servo for my z is also a dedicated 3phase drive.
So as far as I can tell 3 phase is required.

So after chatting with Phase Technologies the output is closed Delta 3 wire phase to phase 1% voltage with on leg being high phase to ground...

The 220v servo drives are currently running 2 hot legs of 220v service no neutral in my test setup( the inputs are designed for oversees power 1 hot 220v leg 1 neutral)

So could I in theory just run those from 2 low legs to ground with 220v between phase?

That just leaves me with the 110v issue

You need a neutral for 120v single phase which you can split from any of you main 240v supply if you live in NA then you have120 / 240v single phase supply not 220v


Don't believe what they are telling you about the RPC, there is not an RPC made, does not matter what brand or manufacture they will not be even close to 1% even the CNC grade RPC


No you can not run the low legs to Ground lots of smoke and Brakers would trip if you short a live wires of anything


Now if you where talking Phase Perfect then there digital phase converter can easy give you clean 3Ph power @ 98% efficiency


Who is the manufacture of the servo drive most 3Ph servo drives will run on single yours would be at the top of the range for single phase though but worth a try

[mactec54]

The spindle motor is a 5.5 kw 3phase servo spindle motor running a 3 phase pulse/direction drive.


The servo for my z is also a dedicated 3phase drive.
So as far as I can tell 3 phase is required.

So after chatting with Phase Technologies the output is closed Delta 3 wire phase to phase 1% voltage with on leg being high phase to ground...

The 220v servo drives are currently running 2 hot legs of 220v service no neutral in my test setup( the inputs are designed for oversees power 1 hot 220v leg 1 neutral)

So could I in theory just run those from 2 low legs to ground with 220v between phase?

That just leaves me with the 110v issue

Are that makes a big difference Phase Perfect is the way to go if you need 3ph power I have a PT380 you could get them to add a Neutral terminal block so you could run a Neutral for a 120v supply as well I did not but did not have a need for 120v

You would take the 120v from one Hot leg that feeds the Phase Perfect and the Neutral and Ground would give you a normal 120v supply

[Jim Dawson]

Don't believe what they are telling you about the RPC, there is not an RPC made, does not matter what brand or manufacture they will not be even close to 1% even the CNC grade RPC

You are correct in that you can't buy one off the shelf. But it's possible to build one Here is a picture of the panel meters on mine 1.01% or better under most operating conditions. T1-T3 is about 255 unloaded, but settles right down under any load. But a Phase Perfect would probably be better.

239, 237, 239, 236 if you can't read the meters.

[wmgeorge]

Very impressive Jim. If the OP needs 5 amps or so 120 vac just install a transformer. We did it all the time on 3 phase MCC that used 120 vac for controls. FYI most PCs today will run on either 120 or 240 vac, please check your power supply!

[mactec54]

You are correct in that you can't buy one off the shelf. But it's possible to build one Here is a picture of the panel meters on mine 1.01% or better under most operating conditions. T1-T3 is about 255 unloaded, but settles right down under any load. But a Phase Perfect would probably be better.

239, 237, 239, 236 if you can't read the meters.

Looks good but still not the at 1% if your wild leg is 255 then you are around 6.7% no point in showing something that others can't have or likely to achieve, but still in reality is no better than a CNC rated RPC