I'm just looking at my options for the day that my my PT-355 will decide to retire. That one runs a 20hp CNC lathe, and the 7.5hp screw compressor and 7.5hp CNC mill. I usually only run the CNC lathe by itself, or mill/comp together, not all 3.
Looks like a 40hp RPC size is what I'd need if I was to try to replace the PT-355 with that.
I currently have #2 and 125A breaking on the 1ph side to the PT-355, and #2 out of it to my delta/wye transformer then to a 3ph SquareD panel.
Could a 40hp rpc just be swapped in place or would I really need to go with 150-200A breaker and 1/0 wire so feed that thing?
I'd likely go with something like those new american rotary models that are supposed to start easier.
I only have 200A on 1ph on the shop.
How big a steady load would the 1ph side really see with a 40hp RPC? I know the ramp up on the lathe spindle takes about 105A on the 1ph side for a second with the PT-355 now, most of my actual cutting is in the 10-30% spindle load range, so maybe 20-30ish A on the 1ph size while it cuts.
What are you guys that run CNC's on RPC's see for loads, and at idle?
thanks
Looks like a 40hp RPC size is what I'd need if I was to try to replace the PT-355 with that.
I currently have #2 and 125A breaking on the 1ph side to the PT-355, and #2 out of it to my delta/wye transformer then to a 3ph SquareD panel.
Could a 40hp rpc just be swapped in place or would I really need to go with 150-200A breaker and 1/0 wire so feed that thing?
I'd likely go with something like those new american rotary models that are supposed to start easier.
I only have 200A on 1ph on the shop.
How big a steady load would the 1ph side really see with a 40hp RPC? I know the ramp up on the lathe spindle takes about 105A on the 1ph side for a second with the PT-355 now, most of my actual cutting is in the 10-30% spindle load range, so maybe 20-30ish A on the 1ph size while it cuts.
What are you guys that run CNC's on RPC's see for loads, and at idle?
thanks