Richard,
I haven't archived all of the messages, so I apologize if some of the
questions I ask have already been answered.
1 -- How do you know that you have noise? What are the specific symptoms?
2 -- Do you get the symptoms with and without the spindle running?
3 -- Somewhere I think it was mentioned that you are using differential
encoders. You are using the proper differential receivers, aren't you? Have
you checked the cable to make sure that all of the pins are making contact?
If the symptoms are that you are dropping or getting extra encoder counts,
does that occur when you rotate the encoder by hand (without the servo being
driven).
Just some thoughts. Not every "noise" problem is caused by grounding.
Ken
[EMAIL PROTECTED]
Mark Kenny Products Company, LLC
55 Main Street Voice: (203)426-7166
Newtown, CT 06470 Fax: (203)426-9138
http://www.MarkKenny.com
-----Original Message-----
From: [EMAIL PROTECTED]
[mailto:[EMAIL PROTECTED] Behalf Of Dave Engvall
Sent: Saturday, February 03, 2007 12:54 AM
To: Enhanced Machine Controller (EMC)
Subject: Re: [Emc-users] System Noise
On Feb 1, 2007, at 6:30 PM, richard harris wrote:
Hello,
This is a bit out of the standard EMC domain, more of an integration
issue.
I have a Rutex 2200 drive, coupled to the Rutex motherboard. The encoder
wires are twisted pair, with shielding grounded at the drive; the power
wires are also shielded and run to the motor in a separate conduit.
Somewhere I am getting noise in this system. I have Rutex 9x drives on my
other machine and they run great, Rutex says that the new drives are more
susceptible to noise. How does that work your new product is inferior to the
one it replaces?
OK, so will the older drives (Rutex ) work on this machine? Is there
anything ( rutex or other drives )that work on this machine?
I know that substitution is often not the best way to fix problems but
when everything else fails one can get pretty desperate and frustrated.
Mazak takes the approach that all leads are shielded and the cables all
run thru a common area where about 2" of the insulation is stripped off and
the shields bonded (clamped) to a common strip. This goes for encoder
cables, servo power cables, etc.
I have tried shortening wires, adding grounds, checking grounds, even
asked the double E's at school.
Any ideas on how to reduce the noise, looking for any ideas at this
point no matter how crazy. If I have to stand on one foot while operating my
mill so be it.
Nope, playing flamingo gets really old after a while.
Good luck.
Dave
Thanks
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