On 6/12/23 22:58, Leonardo Marsaglia wrote:
Guys, just to clarify, the control is still Fanuc, not LCNC. So I need to
interface with the Fanuc control. Also, the drives on this lathe are all
using serial communications (the lathe is from 1997) so I think it's not
that easy to replace an original drive for a non Fanuc one. That's why I'm
just hoping there's some kind of interface to convert the signals from/to
the fanuc control to use a standard VFD. If not, I guess I'll have to
replace the drive entirely and try to repair the one that's not working
without the rush of getting the machine working again.
El lun, 12 jun 2023 a las 17:36, gene heskett (<ghesk...@shentel.net>)
escribió:
Wrong atribution Leonardo. It was posted by Andrew Beck, I was just
commenting that it appears Andrew was overdriving the motors a bit.
On 6/12/23 15:58, andrew beck wrote:
Leon I use a cheap Chinese vfd costs about 190usd
And buy a encoder for it. About 50usd and I'm controlling two fanuc
spindle motors here fine.
They auto tuned the motor in about 4 secs and run awesome.
I can get 150 percent torque at zero rpm. If I run a pid loop in
linuxcnc
almost a servo level control response
Have a look at the video there are links on there. I made it a few
months
ago
https://youtu.be/vARlybdtC6Q
I'll message you in WhatsApp too.
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
did you get that msg?
On Tue, 13 Jun 2023, 07:40 Leonardo Marsaglia, <ldmarsag...@gmail.com>
wrote:
Forgot to attach a picture of the label on the spindle drive. Sorry.
El lun, 12 jun 2023 a las 16:33, Leonardo Marsaglia (<
ldmarsag...@gmail.com>)
escribió:
Hi guys, I hope you're all doing well
Sorry for the OT but we have a problem with a Daewoo lathe and as
always
this is the first place I think of.
So, this morning the lathe started up as always, but when we selected
the
gear to validate the spindle movement the screen showed a 409 SERVO
ALARM
and the spindle drive on the back was showing alarm number 12. From
what
I
could find on several forums this is an overload alarm and in the worst
case scenario the IGBT firing module or the IGBT module itself could be
damaged.
Is there any way to check this in an easy manner?
Also, is it possible to adapt a normal VFD in case this is the
problem?
Because maybe there are some Fanuc Serial protocol to analog voltage
converters (I'm just wishing such an adapter exists) that could be
used.
Thanks as always for your help!
Leonardo
Might be ok for short term operation, Leonardo, but 150% at zero rpm
tells me the vfd's max low speed boost exceeds the motors FLA, aka Full
Load Amps. The vfd should have a variable to fix that. Most do
anyway.. Also, most vfd's will have a minimum hz setting which should
turn off the drive below around 10% of 60 hz. I have mine set to
disable at 5hz. I can do 5.5 for half an hour and still lay my hand on
the motor w/o burning it. Who needs a backgear?
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Cheers, Gene Heskett.
--
"There are four boxes to be used in defense of liberty:
soap, ballot, jury, and ammo. Please use in that order."
-Ed Howdershelt (Author, 1940)
If we desire respect for the law, we must first make the law respectable.
- Louis D. Brandeis
Genes Web page <http://geneslinuxbox.net:6309/>
_______________________________________________
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_______________________________________________
Emc-users mailing list
Emc-users@lists.sourceforge.net
https://lists.sourceforge.net/lists/listinfo/emc-users
Cheers, Gene Heskett.
--
"There are four boxes to be used in defense of liberty:
soap, ballot, jury, and ammo. Please use in that order."
-Ed Howdershelt (Author, 1940)
If we desire respect for the law, we must first make the law respectable.
- Louis D. Brandeis
Genes Web page <http://geneslinuxbox.net:6309/>
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Emc-users@lists.sourceforge.net
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