Richard
I agree with previous suggestions (especially the star ground). You do not say
if you know where the noise is. I presume it is upsetting the encoder pulses.
Do you know this for sure?
Is there any pattern (i.e. one axis much worse than the others)?
Are you using the encoder inputs differentially (RS422) or just feeding TTL to
one leg. The differential signal ought to be pretty noise immune - you might
need an adaptor at the encoder if it has just A and B outputs.
You could try some ferrite beads on the motor armature wires at the drive end.
Are your motors ironless (low inductance)? If so series chokes (reactors) would
reduce ripple on aramature current and might help.
John Prentice
----- Original Message -----
From: richard harris
To: [email protected]
Sent: Friday, February 02, 2007 2:30 AM
Subject: [Emc-users] System Noise
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?
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.
Thanks
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