Power supply question 240volt 3phase power vs 1 phase

[dance191]

Hey Phil,

Long story short, all of your PSUs will not be able to use 3 phase, so you will either give them 2 of the phases and a ground, or 1 phase + 1 neutral + 1 ground.  Always go with 2 phases and a ground as you will need less outlets, wire, etc when using the higher voltage that is from 2 of the phases.  

It sounds like you have a high leg delta system, so I believe one of the legs will be 240, off the top of my head I think the other 2 legs will be 208.  I have never used a delta system, they are older and were for supplying extra volts to start motors. Your a smart guy, grab a multimeter and you will figure it out quickly (just be careful with live wires).

that is the plan

Also grab one of those amp meters you can put around each of the phases (to see how many amps are being used).  They will allow you to answer weird questions like say you are using 10 amps on each phase, and you add another 5 amp psu (using say 1200 watts) to 2 of the phases or 1 phase and neutral.  Does that increase each leg by 5 amps, 2.89 amps, or 2.5 amps?  5 minutes of testing and it will all make sense, have fun, 3 phase is good stuff!

 the pdu's have built in amp meters so I will attempt to have each one at 4  

You will want the meter to see what is going on at the level of each phase.  If you are going to push what is available at the location, you will want to see what each of the phases are pulling at the service entrance.  You know, if you have a 100 amp service, make sure you keep it at 80 amps for each phase, that kind of stuff.  

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[philipma1957]

Hey Phil,

Long story short, all of your PSUs will not be able to use 3 phase, so you will either give them 2 of the phases and a ground, or 1 phase + 1 neutral + 1 ground.  Always go with 2 phases and a ground as you will need less outlets, wire, etc when using the higher voltage that is from 2 of the phases.  

It sounds like you have a high leg delta system, so I believe one of the legs will be 240, off the top of my head I think the other 2 legs will be 208.  I have never used a delta system, they are older and were for supplying extra volts to start motors.  Your a smart guy, grab a multimeter and you will figure it out quickly (just be careful with live wires).  

that is the plan

Also grab one of those amp meters you can put around each of the phases (to see how many amps are being used).  They will allow you to answer weird questions like say you are using 10 amps on each phase, and you add another 5 amp psu (using say 1200 watts) to 2 of the phases or 1 phase and neutral.  Does that increase each leg by 5 amps, 2.89 amps, or 2.5 amps?  5 minutes of testing and it will all make sense, have fun, 3 phase is good stuff!

  the pdu's have built in amp meters so I will attempt to have each one at 4 

You will want the meter to see what is going on at the level of each phase.  If you are going to push what is available at the location, you will want to see what each of the phases are pulling at the service entrance.  You know, if you have a 100 amp service, make sure you keep it at 80 amps for each phase, that kind of stuff. 

Personally, I have a lot of machines and it would be impossible to see the big picture at the service entrance unless you measure it there.  If you just have a few machines, no need for the meter. 

  He can spare 30 amps of it which = 3 pdu's at 10 amps each as a max.
  my goal is 6 miners using 3 psu's at the 1000 watt level  which should be only 4 or 5 amps a pdu.

 I have 2 x 1200watt plats
 I have 1 x 1600 watt plat
 I have 1 x   750 watt plat
 I have 1 x   650 watt plat
 I have 2 x  1300 watt gold
 I have 1 x    650 watt gold

 I would be able to go 2x it if things are working out well. So it is not a question of have to get pdus or psus

 Just need to be sure what each of the 3 balanced plugs will supply me 208 volts or 240 volts.

[philipma1957]

I have done my home with 2 outlets.  but it is your standard  2x 120 lines and a ground.

This plug was a dedicated subwoofer outlet but 120 volt.  10 gauge romex easy to convert.  just add the 240 socket in the wall and a 2 pole circuit breaker in the circuit breaker box.


This was on of 3 subs power by that older 120 volt socket.




next is the 240 that is in use with a pdu. I had a
120 volt 20 amp socket only 2 feet from the breaker box. I pulled the 1 pole  20 amp circuit breaker and added a 20 amp 2 pole breaker

note the black nema 15r to l6 30r adapter.  It means I can change this socket back to 120 really fast.




pdu  with 1 evga 1600 p2 hooked up


http://imagizer.imageshack.us/v2/1024x768q90/905/mriEMM.jpg




note how the pdu has plug holder.  I purchased a yellow plug cord to show this to you all as clearly as possible.

[notlist3d]

philipma very nicely done on the install.  Looks great.

Thanks for help aswell on 240, hopefully I will finnaly get one in next week or two.

[philipma1957]

philipma very nicely done on the install.  Looks great.

Thanks for help aswell on 240, hopefully I will finnaly get one in next week or two.

 Please  just make sure 10 gauge wires  30 amp 2 pole switch.

That adapter setup is a bit shaky but the unplugged receptacle  next to the sub is 10 gauge 1 single 30 amp plug to the 30 amp 2 pole circuit in the circuit breaker.  It is code and derates to 24 amps 24/7/365 or about 5760 watts.  finsky has those big ass 2880 watt loud as fuck psu's for sale you can do 2 of them on 1   240 volt  pdu.