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Author Topic: Spindle overspeed  (Read 1975 times)

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Spindle overspeed
« on: January 10, 2015, 05:16:29 AM »
I have a VFD which runs my spindle and is controlled by a plugin in mach3.
If I set my speed to 24000 and start the spindle (M03 S24000), the spindle starts and runs at 24000rpm.
I then press the minus sign in the Spindle section and my motor slows down. I press the plus sign and my RPM increases. If press the plus sign until requested speed exceeds 24000 rpm, the spindle stops and Mach3 program run stops.
How can I set Mach3 so that I cant request an RPM higher than 24K?

Offline Hood

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Re: Spindle overspeed
« Reply #1 on: January 10, 2015, 06:49:44 AM »
Have you got 24,000 as the max in Spindle pulleys?
Hood
Re: Spindle overspeed
« Reply #2 on: January 10, 2015, 07:38:57 AM »
Yes I Do. I thought that might be the problem tho. Should it be at 24K?

Offline Hood

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Re: Spindle overspeed
« Reply #3 on: January 10, 2015, 08:04:28 AM »
Ok then it is possibly something in the plugin.
Are there any settings in the plugin that you can alter?
Hood
Re: Spindle overspeed
« Reply #4 on: January 10, 2015, 09:57:22 AM »
Does the spindle speed go to zero with the drive still in run mode or does the drive shut off completely?
Re: Spindle overspeed
« Reply #5 on: January 11, 2015, 02:16:04 AM »
I wound the speed backwards (spindle slowing in proportion) and when it got to zero the spindle stopped, but did not turn off. Winding it back up, speed increased. So, I would say no, it does not shut down at zero.
I got too excited machining things to experiment with it any more, I just made sure I didn't override past 24K.  I think there must be something in Mach3 that says when you go over max speed, shut down, where as it would be nicer to just ignore and run at max.

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Re: Spindle overspeed
« Reply #6 on: January 11, 2015, 05:13:33 AM »
When you say "shut down" are you actually meaning Mach goes into Reset or?
As I said earlier, is there anything in your plugin to config? It sounds like, to me , that the plugin is telling things to halt. As far as I am aware there is nothing in Mach that could do this, at the most I would expect a too fast for pulley message, but no "shut down" whatever you mean by that.
Hood
Re: Spindle overspeed
« Reply #7 on: January 12, 2015, 05:01:39 AM »
Looks like it was a combination of both.
Max speed set in the VFD is 400hZ which is 24,000RPM. In Mach3 Max speed was set to 240,000 so Mach was telling spindle to go too fast and VFD was saying "nup, not gunna do it!" and shut down.
Min spindle speed was set to zero in Mach3, so when I ran it down bellow zero, I got the mach 3 "too slow for pulley" warning, but because mach3 would only send speed = zero and the VFD was set to min at zero as well, no spindle stop happened.

Set Speed max to 24000 and min to 8000 and all is working fine. I get the to slow/fast warnings, but it keeps spinning. I'll adjust the VFD to slowest of 8K to match as well.

Thanks for your assistance.