Fossil
9th June 2006, 03:08 PM
Hello all,
I have decided to bite the bullet and get 3 phase going in my workshop.
I have 7 machines that now have single phase motors. I plan to change these over to three phase, and to sell of the single phase motors to help fund the changeover.
I have a 10hp 3 phase motor to use for the idler, and I also have several smaller 3ph motors lying around from 2 to 5hp. My workshop has 4mm/sq active and neutral supply, to a sub board with earth stake at the board. I presume I have the required 40amps single phase at the sub board, as the supply easily starts my biggest single phase motor, being a 4hp 4 pole on a large stroke sander.
So...... my questions after plenty of reading about this stuff on mainly US sites:
Do I need a step up transformer to get 415 single phase, before conversion to 3 phase, or am I reading correctly that the idler motor will generate the required 415 3 phase from 240v single all by itself?
If it will, do I need to spin up the idler motor first, with a smaller single phase motor to get it all working, or will the idler motor start and produce 3 phase without initial external rotation?
Has anyone here actually built one of these with Australian 240v 50hz single phase supply?
Reason for changing over??
1. I used to have a larger shop which had 3 phase. Since moving about ten years ago, I haven't been able to run my spindle moulder, which would require a 7hp single phase motor, which is too big for my available power. I have been using a router table for that time, and I am sick of it, considering the moulder has a 2hp feeder as well.
2. I have plenty of 3 phase motors laying around, and can get what I don't have very cheaply from my brother.
3. I have been offered a nice wide belt sander that needs 3 phase as well, and I can sell my stroke sander for a couple of hundred less than getting this nice wide belt sander fro a fiend who has now retired. :)
I hope I have explained this well enough.
Thanks in advance for any assistance. :)
I have decided to bite the bullet and get 3 phase going in my workshop.
I have 7 machines that now have single phase motors. I plan to change these over to three phase, and to sell of the single phase motors to help fund the changeover.
I have a 10hp 3 phase motor to use for the idler, and I also have several smaller 3ph motors lying around from 2 to 5hp. My workshop has 4mm/sq active and neutral supply, to a sub board with earth stake at the board. I presume I have the required 40amps single phase at the sub board, as the supply easily starts my biggest single phase motor, being a 4hp 4 pole on a large stroke sander.
So...... my questions after plenty of reading about this stuff on mainly US sites:
Do I need a step up transformer to get 415 single phase, before conversion to 3 phase, or am I reading correctly that the idler motor will generate the required 415 3 phase from 240v single all by itself?
If it will, do I need to spin up the idler motor first, with a smaller single phase motor to get it all working, or will the idler motor start and produce 3 phase without initial external rotation?
Has anyone here actually built one of these with Australian 240v 50hz single phase supply?
Reason for changing over??
1. I used to have a larger shop which had 3 phase. Since moving about ten years ago, I haven't been able to run my spindle moulder, which would require a 7hp single phase motor, which is too big for my available power. I have been using a router table for that time, and I am sick of it, considering the moulder has a 2hp feeder as well.
2. I have plenty of 3 phase motors laying around, and can get what I don't have very cheaply from my brother.
3. I have been offered a nice wide belt sander that needs 3 phase as well, and I can sell my stroke sander for a couple of hundred less than getting this nice wide belt sander fro a fiend who has now retired. :)
I hope I have explained this well enough.
Thanks in advance for any assistance. :)