CNC electronic enclosure wiring

[Vitali-M]

It is my first time assembling a CNC electronic enclosure, I have some notion of electronic concepts, but I confess that even after reading many threads and sites I still have some questions.


I made the diagram (please ignore if something is outside the convention) to try to demonstrate my idea, it is attached.

I will have a 4-pin industrial socket with 2 phases, neutral and ground. The voltage here in Brazil is 220v and 127v.

I will put the whole system behind a dc switch 220v 30A.

Should I put fuses (they are marked on the diagram) where are my notes on the diagram?


How can I put an e-stop on my system? maybe using a DPDT relay?

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[Al_The_Man]

You should always use fuses or a NFB (non-Fused-Breaker)
I have never used a filter on the VFD input, I prefer to use one. if at all, on the output between VFD and motor.
There is a NA publication that covers some of these questions, NFPA79, Electrical Standards for Industrial machinery.
There is a copy on line via Google still I believe.
Al.

[Vitali-M]

You should always use fuses or a NFB (non-Fused-Breaker)
I have never used a filter on the VFD input, I prefer to use one. if at all, on the output between VFD and motor.
There is a NA publication that covers some of these questions, NFPA79, Electrical Standards for Industrial machinery.
There is a copy on line via Google still I believe.
Al.

Thanks for your reply,
I reviewed my schematic and added fuses in some places, I would like to know what you think, does it make sense? or somewhere has no need?

I will take a look on this NFPA79, I just found to buy.


How should I connect the EMI filter between the VFD and the motor?

[Vitali-M]

I redid my diagram, in your opinion is it correct? I added an e-stop system, the idea is to use the 24v to also power my Inductive Proximity Sensors

[Al_The_Man]

I found it no problem.
https://www.google.com/url?sa=t&rct=...XLA5UYN72AEZQY


There are quite a few articles and utube videos on 3ph inductor between VFD and motor out there also.
The E-stop should open circuit all power to motor driven devices, controllers and other less hazardous equip. can remain powered.
Al.

[Vitali-M]

I found it no problem.
https://www.google.com/url?sa=t&rct=...XLA5UYN72AEZQY


There are quite a few articles and utube videos on 3ph inductor between VFD and motor out there also.
The E-stop should open circuit all power to motor driven devices, controllers and other less hazardous equip. can remain powered.
Al.

Thanks Al!
I was looking for the latest, I hadn't found this 2007 document! I will start reading

I thought about cutting off the power supply to the drivers / motors, leaving the VFD and the grbl controller on. I read on some cnczone thread about keeping the VFD energized and warn it to using a signal to stop its operation.

is it possible to use a contactor instead of using DPDT relay? I'm searching about that to understand better