On Thu, 29 Jun 2017, Les Newell wrote:
Date: Thu, 29 Jun 2017 21:59:46 +0100
From: Les Newell <les.new...@fastmail.co.uk>
Reply-To: "Enhanced Machine Controller (EMC)"
<emc-users@lists.sourceforge.net>
To: emc-users@lists.sourceforge.net
Subject: Re: [Emc-users] Rough motion with servos
Do you have and raw-write encoder filter tweaking stuff in the hal file:
No. For testing purposes I am running the barest minimum needed to achieve
motion using a config generated by pncconf.
If you did this before I would make sure you duplicate this
The default encoder filter is quite short even with the filter bit on
On a 5I20 its 15x30ns (filter bit on) so only 450 ns which is in the range of
coupled impulse noise spikes from the 7I29
With current LinuxCNC dists (2.7 and 2.8) you can lower the encoder sampling
frequency by setting hm2_card.0.encoder.sample-frequency
If you set this to say 5000000, This will result in a 15*200ns =3 usec filter
on all encoder inputs that have their filter bit on, This will limit the
maximum count frequency to about 666 KHz and be much more resistant to
coupled impulse noise from the motor PWM
Peter Wallace
Mesa Electronics
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