The electrician to install a rotary phase converter from
http://www.deselectric.com/ and connect my 3-phase
CNC router had to go overseas for medical reasons and I have been stuck for a few months now......
I had several other electricians over to see what's required and most, if not all, have never seen a rotary phase converter and each one comes up with different opinions, advise and/or plans. I am getting extremely frustrated and would appreciate advice from qualified people on this forum.
This link shows a diagram illustrating my blurb below. It's not professional but helps in clarifying things.
http://dl.getdropbox.com/u/2043845/CNC%20wiring.jpg What I have at present:
a) Electricity as supplied by power company is 220V, single phase.
b) Meter panel has now 50 Amp breaker.
c) # 6 AWG from meter panel to breaker panel. Distance about 60 feet.
d) Main breaker on breaker panel 50 Amps
e) # 8 AWG with 30 Amp breaker from breaker panel to location of
CNC machines Distance about 110 feet.
Other equipment,SINGLE phase, on same breaker panel but on *separate* breakers and wires, running at the same time.
f) 220V 2.2 KW dust collector
g) A/C unit, 12000 BTU.
h) 3 desk top computers
i) about 2 Kw for lighting and miscellaneous
What I need installation/modification for:
1) 20 HP rotary phase converter to supply 3-phase to the following equipment...
2) 5KW spindle,
3) 4KW vacuum pump
4) 4KW compressor (the compressor shipped is 380V rated ??? Amps but factory has sent a step-up transformer. I don't know what this means as far as wattage is concerned)
5) small pump for water cooled spindle
Factory suggested 18KW total for items 2 (with its controller), 3, 4 and 5 running together.
Sequence I am going to use for switching on equipment:
- Rotary phase converter, compressor, coolant pump, spindle (warming up), vacuum pump (if/when needed)
I realize that some changes are necessary,but what ?
- breaker (item b) to what Amperage?
- is # 6 AWG ,(item c) good enough? ( I say 'good enough' because I may move to different location in near furture so I wish to limit my expenses where possible)
- main breaker (item d) ??? Amps
- is the #8 AWG (item e) good enough? (same 'good enough' reason as for #6 AWG)
if you want me to post additional details, you can also email nmajerus AT caribsurf DOT com
Your help and/or advise is much appreciated.
Thanks