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Author Topic: G100 VFD Spindle speed Fluctuations  (Read 1430 times)
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sven_d
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« on: July 31, 2009, 05:12:40 AM »

Can anyone help with this one?
My setup is - mach3mill latest lockdown version, G100 with latest plug in, DigiSpeed-gx controlling VFD.

The rpm of my VFD controlled spindle motor is changing  under heavy load, so much so that the steppers slow down due to the extra load (I think).
I did a couple of tests where I could get the slowing down to happen while making a heavy cut with the jog button and spindle set with M3S2500.

The result- speed goes up and down allmost stalling, I noticed on the G100 monitor page the analogue out would drop from 2.3 to 1.2 when the fault occurs.

The problem  does not appear until the cuts get heavy,

Did the same test but this time the spindle was controlled manually (VFD with a pot)  and there was no speed change, I doubled the feed rate  up to 300mm/min with no sign
of a slow down.

Could my feed rate override macro pump have something to do with it?

Sven


« Last Edit: July 31, 2009, 06:43:16 PM by sven_d » Logged
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