John Prentice wrote: > 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? >
Since the Rutex drives don't have opto-isolators on the step and direction inputs, and (usually) each encoder is powered from its drive, but the multiple drives may have offset voltages between them due to power supply currents from a common supply, the computer commands are likely to be affected by noise. (On the other hand, long parallel runs of encoder and motor cables can induce a lot of noise on the encoder signals.) This is why I designed an output filter into the motor outputs of all my drives. Generally no more than 1 V of the PWM carrier left on the motor outputs, which just gets rid of these sorts of issues. My very unscientific test is if I can use an AM radio with only noise pickup between broadcast stations while the machine is running, then the filtering is good enough. Jon ------------------------------------------------------------------------- Using Tomcat but need to do more? Need to support web services, security? Get stuff done quickly with pre-integrated technology to make your job easier. Download IBM WebSphere Application Server v.1.0.1 based on Apache Geronimo http://sel.as-us.falkag.net/sel?cmd=lnk&kid=120709&bid=263057&dat=121642 _______________________________________________ Emc-users mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/emc-users
