Electronics for New Machine + Chinese Spindle + VFD

[routercnc]

Don't know if this is related to your problem or not but from time to time in the past I've had e-stops when the cutting loads suddenly increased. If the cutter was clogging up (aluminium) and slowing or stopping the spindle it could trip the e-stop.

I assumed this was increased electrical noise from the VFD as the amps shot up, and any long cables were like antennas which fed this into the BOB. In particular the long run to the Z seem most affected.

Since upgrading to 24V on the e-stop & limit circuit (i.e. relay into the BOB with very short wires) I've not had an unintended e-stop due to sudden load increases.

So when you do an air cut things are different to doing the real cut in terms of VFD load and this is another factor to consider in the diagnosis. Having said that if Mach3 is not e-stopping then it surely points to something in the UC300 or USB?
....
Not sure if you were joking but this forum was set up by Lee Roberts [and we are all indebted to him for doing so]. Dean (JazzCNC) is a massive contributor so you could be mistaken for thinking that, but it is not his creation. On that subject I think Jonathan is still a moderator ?

[mturneruk]

Just re-reading Jazz's post Number 132.

The Amps should match or be close to the Motors rating as possible. Good drives will let you set exactly to match motors but If no exact match then set to next lowest. You'll just have lower than rated Torque but better than going higher and having more motor heating.

Here is a link to the spec sheet for my motors.
http://cnc4you.co.uk/resources/Stepp...1-03%204Nm.pdf

It seems to suggest they are rated for 4 Amps (if I understand the spec correctly). Hence the 3.8Amp suggestion i guess.

So where do i go from here i suppose is the question.

[mturneruk]

Hear you Jazz.

So you don't think it's load related.
In that case is it possible that the VFD is generating a lot more noise when it's cutting rather than just running ?
Is the next test to take the VFD out of my enclosure?
Nightmare...

[JAZZCNC]

Hear you Jazz.

So you don't think it's load related.
In that case is it possible that the VFD is generating a lot more noise when it's cutting rather than just running ?

Yes it's possible but whether or not that is the problem I'm not so sure.! The easy way to check is to remove the VFD from the Control box.
The VFD cables running thru the machine shouldn't be a problem provided you have a little separation from signal cables.

Like I say this won't be load related because I've pushed cutter thru MDF without spindle running and motors not stalled before material is ripped from bed so with the small DOC and low Feed rate you have been using then it won't be load. Even with a very tired cutter it wouldn't cause this problem.!. . . Again thou easy checked just throw a new cutter in it.!!

The amps are fine at 3.8A. 2000(10x) micro steps are fine so you have no issues there.
It's not the drives protecting them selfs, they would just fault and blink at you showing what cause the fault.

Can you make it do it and video it. This may highlight some things. Also show the Electrics and wiring around machine.

[mturneruk]

Thanks Jazz. First job in the morning.

[mturneruk]

OK.

So here is a video of the problem.

https://www.youtube.com/watch?v=SeALZMIaJ70

If you want me to video inside the box i will.
I was racking my brains this morning and i remember something similar happening on my previous machine when jogging.
Could this possibly point to the fact that my problems are possibly connected to the PC / mach3 driver / plugin?

Cheers
Martin

[JAZZCNC]

I was racking my brains this morning and i remember something similar happening on my previous machine when jogging.

Common denominator being the Keyboard.? . . . Did you try changing the keyboard as I suggested.? I've had many daft happenings like this over the years and it's been keyboard related.

I think you have 2 issues really. The losing connection I'm 99% sure is noise affecting the USB.

The Jogging I'm betting is keyboard related.

[mturneruk]

1. Reinstalled Mach 3 from scratch and re-entered all my settings. Same problem.

2. Just tried a different keyboard. Same problem.

3. Purchased UCCNC as an alternative to mach 3. That's the next test.

After that i suppose i have to assume it's noise and i will have to try taking the VFD out of the box.