Richard-
A faster input that has less filtering makes sense electronically. In general
the more filtering you have the slower the response time is.
Are you getting noise on the control inputs from the computer, the encoder
input, or both?
If you can tolerate slower communication and the problem is on the
communication with the computer then adding ceramic caps on the inputs might
help. Rutex USA should be able to help you figure out how to wire them in.
PWM can certainly generate a lot of noise, but I'm surprised they did not
compensate for it better-it's not like the did not know it would be a problem
at design time. If the problem is radiated noise then filtering or
optoisolation will help. If the problem is transmitted noise-such as noise
being transmitted through the common traces of the circuit board-there is not
much you can do other than replace the drive.
Javid
- Original Message -----
From: richard harris
To: Enhanced Machine Controller (EMC)
Sent: Friday, February 02, 2007 7:06 PM
Subject: Re: [Emc-users] System Noise
First my sincere appreciation for all the help, this machine is really
starting to drive me nuts.
Things that I have now tried are;
Series choke - no apparent affect
Ferrite beads - no apparent affect
Series choke and Ferrite beads - no apparent affect
Wraping the drive in foil - no apparent affect, but the aliens
will not read its thoughts
I put all the grounds to a common point - no affect
I removed all the grounds on the system - no affect
The encoders are BEI H25's and are differential, the motors nameplates are
long worn away but they are 90v 10amp continuous rated.
Rutex USA says the new drives have different filters, from the older 9series,
which make them more susceptible to noise, but it allows for faster
communication between the drive and computer. He also said that the noise is
from the PWM chopping of the drive itself and not an external source.
I'm hardly a Double E, so I am swimming in the deep end. I used to have
electric RC cars with PWM speed controllers, and we would put small ceramic
caps across the terminals at the motor. Is that an idea, or am I going to kill
myself or worse a motor.
Again thanks for the help and if you have more ideas throw them at me.
Richard
richard harris <[EMAIL PROTECTED]> 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?
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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