I'm in the process of building a DIY CNC machine for woodworking, ( Another DIY CNC Machine Project), And I am needing to make some decisions and purchases of various electronic parts for the controller. My experience is limited so I have some questions for the CNC Electronics hive mind I hope I can get. some advice on. This particular machine will have a 3.5KW Air Cooled spindle that comes with a 220 single phase 4KW Huanyang VFD HY04D023B that is rated at current draw of 18 Amps. It will also have 4 Delta ASD-B3-0421-L 400W 220V AC Servo Motor Drives with 4 ECM-B3M-20604RS1 400W 220V AC Servo Motor. The controller board will be a UC300ETH-Max, (UC300ETH with UB!/UD1 BOB and UCCNC). There will be one MEAN WELL SDR-75-24 - 75 watt 24 volt DIN Rail Power Supply for the controller and I may have an additional 60 watt 12 volt Power supply for cooling fans.
1.1 My assumption is my input power needs to be a single phase 30 Amp 240 circuit. My questions arise from how many branch circuits there should be in the controller box. I would think that there should be at least one 20 Amp MCB for the HY VFD and possibly one 10 Amp for the Servo Drives and DC power supplies, but would it be better to have a separate 1 Amp MCB for the DC power supplies?
1.2 Should the Mini Circuit Breakers be UL 489 or UL 1077?
1.3 What Trip Curve should the MCBs be. B, C or D? Should I assume D because the HY VFD and and Servo Drives are motors?
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2.1 My second area of questioning is how to choose magnetic contactors that I can use both to switch on power for each circuit as well as trip the power off from an alarm circuit.
2.2 Also should I have a main cutoff switch for power that feeds the breakers, should it also be a magnetic contactor or would it be better to be something like this Merz rotary cutoff switch
I'm sure the answers I get will probably elicit further question on integrating these parts together correctly including adding an EMI filter per my Delta manual and other issues you all might raise.