1 or 2 dedicated 120VAC circuits for my CNC?

I assume you're running a separate spindle - like a Bosch Colt or some other manually-activated thing?   Otherwise it's not really a router...?

If you want to add a filter you can add it to the AC-in between the main circuit breaker and a distribution block (that your PSU's are fed from).

Unless you have some component that generates PWM noise, I don't see a need for an EMI filter or line reactor with the setup you've described.

For surge protection, don't bother.  The PSU's will take the hit and likely save your drives and other components.  You're better off spending time/money making sure you've got a good e-stop circuit and disconnect scheme.

spumco wrote:

I assume you're running a separate spindle - like a Bosch Colt or some other manually-activated thing?   Otherwise it's not really a router...?

If you want to add a filter you can add it to the AC-in between the main circuit breaker and a distribution block (that your PSU's are fed from).

Unless you have some component that generates PWM noise, I don't see a need for an EMI filter or line reactor with the setup you've described.

For surge protection, don't bother.  The PSU's will take the hit and likely save your drives and other components.  You're better off spending time/money making sure you've got a good e-stop circuit and disconnect scheme.

Perfect! Thanks!

Meant to ask... is there some reason you're going with a 120v system and not 240v?  Your PSU's should have a 120/240 switch to take different input voltages.

Going with 240 means a single cord/cable feeding the whole thing rather than two 120v cords (if I'm following your plan).

And if you're worried about where to plug the spindle motor in, if you use a 4-conductor cable from the outlet you can have a neutral line tied to your main house box... meaning you can install a 120v socket on the side of the CNC control box and plug the spindle in to that.  One leg of the 240 feeds the socket and return via the neutral. (4-conductor = L1, L2, N, Gnd)

Even better - have that socket controlled by a relay, with the relay coil tied in to your e-stop and/or mesa so you and LCNC can kill the power to the spindle motor socket during an emergency.

I understand using 120 for some systems... I'm doing an old Torchmate right now and using 120 for all the motion & control stuff so it can be plugged in anywhere.  But this is a special-use project.

spumco wrote:

Meant to ask... is there some reason you're going with a 120v system and not 240v?  Your PSU's should have a 120/240 switch to take different input voltages.

Going with 240 means a single cord/cable feeding the whole thing rather than two 120v cords (if I'm following your plan).

And if you're worried about where to plug the spindle motor in, if you use a 4-conductor cable from the outlet you can have a neutral line tied to your main house box... meaning you can install a 120v socket on the side of the CNC control box and plug the spindle in to that.  One leg of the 240 feeds the socket and return via the neutral. (4-conductor = L1, L2, N, Gnd)

Even better - have that socket controlled by a relay, with the relay coil tied in to your e-stop and/or mesa so you and LCNC can kill the power to the spindle motor socket during an emergency.

I understand using 120 for some systems... I'm doing an old Torchmate right now and using 120 for all the motion & control stuff so it can be plugged in anywhere.  But this is a special-use project.

Actually maybe I described what I was doing incorrectly. I am running 120V mainly because getting 240V to my machine at this time would be a hassle. What I meant is that I have two open spots (120V) in my electrical panel that I plan to run a dedicated 20A circuit to my CNC. The circuit that is currently in my CNC room is used by other shop tools/machinery (miter saw, table saw, drill, planer, LinuxCNC PC, etc). My thought was to run two separate circuits in order to hopefully provide cleaner power to the logic/low voltage side, but looks like that is not the case, but also I don't want to take the chance of tripping the breaker if I happen to over load the circuit while the CNC is running. If my thinking is incorrect, please let me know.

In the future I may change over to 240V once we move to our new property.

I am still learning how all this gets hooked up. I will have to dissect your comment to try to understand it correctly.
Thanks

Sorry if I wasn't clear, or didn't simplify enough.  I get it - learning curve.

So... here's a suggestion.  Make a list of all components - spindle, PSU's, lights, disco ball, ect.  Write down all the amps they can pull.  that'll tell you if your 20A breaker can handle the load.

I suspect that if you're using a 60V PSU for the motor drives, you're using a stepper based system.  Those don't vary in load - i.e. pull more amps under higher cutting forces.  They pull the same amps no matter what.  What'll trip your breaker is - maybe - your spindle.

Still don't know exactly what you're using for a spindle and how it's powered. Knowing that detail would be helpful.

And if I'm following you correctly, you want/intend to run a new, dedicated 20A circuit for the CNC.  Yes - that's a good idea.

 

Yeah I should probably do some math on the circuit but my concern as mentioned is the other shop tools/machinery (miter saw, table saw, drill, planer, LinuxCNC PC, etc) that are on the same circuit. I won't be running them to often while the CNC is running but because the CNC can run for hours, there may be times that I need to. I just want to steer clear of tripping the circuit if I do. It usually isn't the running amps from those pieces of machinery but the startup amps are killer at times. I trip shit from time to time, especially with my table saw. So in order to avoid having issues I just plan to run the CNC on its own circuit. BTW, my router is a Dewalt DWP611.

From what you guys have said, running a separate 20amp circuit to the CNC is not a bad idea. Thanks!