PM-30MV converting

[RKM 3D Designs]

Centroid Acorn is your chosen control. (Great choice in my opinion! )
I personally think Leadshine or Stepper on line are decent brands. Better than generic.
Just check with others with similar sized machines, to find what size motors/drives/power supplies, VFD's, others are using on their machines successfully and follow suit. Ask them questions. Most are willing to share what works, doesn't work, and what they might have done better.

My fear is that you ask for advice, the suggestion is given, you buy it, it doesn't work out and then you come back and place blame because you percieve that someone told you to buy/do something and you are upset. I hope you understand what I'm getting at.

You ask for advice and opinions, we are here to share them. At the end of the day, you have to make the decision that best suits you. If this is your first machine, take the time you need to research and feel reasonably confident you are making a purchase you only have to do once. Nothing worse than trying to save a buck and having to buy twice. In the long run, that costs you more money and time than if you would have spent a little more money and bought the right thing to begin with. CNC can get expensive when you add everthing up.

CNCZONE.COM is a popular forum for questions like yours. There may be a group on www.groups.io for Precision Matthews users.
Maybe google Precision Matthews forum or Precision Mathews PM-30V CNC.

Hope for your understanding...
Marty

totally get what you are saying.
thankyou for any and all help as i ask.

thank you,
RKM

[RKM 3D Designs]

im having trouble searching info on why a a transformer like this:
https://www.antekinc.com/as-4432-400va-32v-transformer/
will work just fine for my choice of steppers and drivers like these:
for the x & y
https://www.omc-stepperonline.com/1-axi ... river.html
for the z
https://www.omc-stepperonline.com/tp-se ... river.html

dont i need way more watts even more voltage?
am i just best off running 3 400 watt 48V switching DC power supplies?
im having trouble wrapping my head around this for some reason( the wiring of the transformer).
i say doing 3 DC switching power supplies because i know how to hook those up, and it would give me the proper wattage for each driver and stepper set.
thoughts?

[martyscncgarage]

im having trouble searching info on why a a transformer like this:
https://www.antekinc.com/as-4432-400va-32v-transformer/
will work just fine for my choice of steppers and drivers like these:
for the x & y
https://www.omc-stepperonline.com/1-axi ... river.html
for the z
https://www.omc-stepperonline.com/tp-se ... river.html

dont i need way more watts even more voltage?
am i just best off running 3 400 watt 48V switching DC power supplies?
im having trouble wrapping my head around this for some reason( the wiring of the transformer).
i say doing 3 DC switching power supplies because i know how to hook those up, and it would give me the proper wattage for each driver and stepper set.
thoughts?

No problem. Feel free...
Marty

[RKM 3D Designs]

im having trouble searching info on why a a transformer like this:
https://www.antekinc.com/as-4432-400va-32v-transformer/
will work just fine for my choice of steppers and drivers like these:
for the x & y
https://www.omc-stepperonline.com/1-axi ... river.html
for the z
https://www.omc-stepperonline.com/tp-se ... river.html

dont i need way more watts even more voltage?
am i just best off running 3 400 watt 48V switching DC power supplies?
im having trouble wrapping my head around this for some reason( the wiring of the transformer).
i say doing 3 DC switching power supplies because i know how to hook those up, and it would give me the proper wattage for each driver and stepper set.
thoughts?

No problem. Feel free...
Marty

confused on what you are replying to.

[martyscncgarage]

Just use the three switching power supplies. They will work and you are comfortable with it.

[RKM 3D Designs]

Just use the three switching power supplies. They will work and you are comfortable with it.

thank you, seriously.
i have been second guessing myself on this.
this was really my road block. electricity i dont like being in the dark or not understanding even one small part.
3 supplies will work perfect, that is "easy" for me.

thankyou again guys so much.

[ShawnM]

Keep in mind when designing this system that you won't get the peak performance from that driver/motor combo using a 48 volt/400 watt supply. It's designed to operate up to 80 volts and you want to feed it 48 volts. And 400 watts is about half the current the motor can take. You don't want to overdrive the motor/driver combo for fear of too much heat but you are under driving it and will give up some performance.

[Muzzer]

I can't see how that motor could draw more power than the PSU could provide. The current drawn by the motor phases at their low voltage is greater than the current drawn from the PSU at 48V - that's how these drivers work. So multiplying the phase current by the PSU voltage is not the way to go.

To get an idea of the power you'd need, multiply the motor torque by the speed and divide by the efficiency. Looking at the motor curves for this system, you might achieve 2Nm at 600rpm. That's about 125W of shaft power (here's a calculator https://planetcalc.com/1908/). In old units, that's 1/8hp. Even if we assume a miserable motor efficiency of 60%, that would only require about 200W ie half the power available from the PSU.

As mentioned, running a lower voltage will reduce your maximum speeds although this is at least a closed loop system, so there's less risk of missing steps without being made aware of them.

[ShawnM]

I'm not saying the motor will draw more current than the power supply can provide. My point was using the lower voltage will reduce rapid speeds during moves and using a supply with a low current rating will reduce the torque of the motor. I'm not a fan of Gecko but they have a great set of documents on voltage, current and getting optimum performance from drive/motor combos. I'm sure there's a million other docs out there on the web to read and people far smarter than I on the subject. I'm just stating that in my opinion that power supply he wants to use is not optimal for that drive/motor combo, will it work? All day long.

[Muzzer]

No it won't. If you measure the current going into the drive, you'll find it's a lot less than the phase current even under the worst case and quite a bit less than the 48V / 400W PSU can provide. Unless you manage to exceed the 8.3A current limit, it won't affect the motor torque. At that point, you'd be using 400W of electric power. There is simply no way this motor / drive combo can do so.

I'm simply trying to help people to understand what is happening here. I speak as a hardware engineer who has been developing PSUs and motor drives for several decades.