I've just fitted one of them there 'Chinese' 2.2kW watercooled motors
with a Huanyang VFD as a second spindle on my mill.
Last night doing some pocketing, when the cutter got into the 'meat' of
the cut (6mm carbide 2 flute, 3mm DOC), Linuxcnc (v2.6.7) tripped with
Axis 2 limit switch.
This was unexpected as I was nowhere near the Z-axis limit switches so I
checked the connections and started the job again.... and it did
exactly the same thing again in the same place!
Just for fun, I reduced the DOC, tried again and the same thing happened
in the same place (about 20 seconds into the job). Hmmmm....
The VFD is 1 foot away from the limit switch wiring, and the connection
from the VFD to the motor is shielded and grounded at the VFD end. I'm
controlling the VFD with hy_vfd over RS485.
The limit switches (normal microswitches bolted to the column) are wired
to a Mesa 7i76 with 12V field power and have not played up before.
I did an 'air-cut' and that ran well past the place it was consistently
failing.
I commented out:
#net both-home-z => axis.2.home-sw-in
#net both-home-z => axis.2.neg-lim-sw-in
#net both-home-z => axis.2.pos-lim-sw-in
in my Mill.hal file and the job ran to the end. Axis 0 and 1 limits
were left unchanged.
I ran out of time to experiment much further but I'm struggling to see
how the VFD could trip a simple limit switch when it's getting a bit
loaded up (the spindle was only pulling ~1amp according to hy_vfd and
it's rated for 8).
I don't think it was simple vibration as I'd been fly cutting with my
normal spindle shortly before and that didn't trip anything.
Any ideas what might cause this?
--
Regards,
Russell
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| Russell Brown | MAIL: [email protected] PHONE: 01780 471800 |
| Lady Lodge Systems | WWW Work: http://www.lls.com |
| Peterborough, England | WWW Play: http://www.ruffle.me.uk |
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