On Sun, 11 Aug 2019, Les Newell wrote:
Date: Sun, 11 Aug 2019 15:58:05 +0100
From: Les Newell <[email protected]>
Reply-To: "Enhanced Machine Controller (EMC)"
<[email protected]>
To: [email protected]
Subject: [Emc-users] PID feed forward
Has feed forward changed recently? I have been using the build bot release as
of a few months back on my router and today I decide decided to update to the
latest. Now I get lots of following errors and on testing FF1 appears to have
no effect. Previously a small amount of FF1 made quite a difference on this
machine. Even using a ludicrous value of 10000 made no detectable difference.
Les
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Yes, previously the PID command-deriv pin did not work so FF1 was always
calculated internally by using DP/DT, Now it does work in the somewhat magic way
it was intended to work ( calculate the velocity internally if the command-deriv
pin is unconnected but use command-deriv if its is connected)
So if you had your PID components command-deriv pin connected to a signal
but the signal was not driven (connected to motions commanded velocity
pin for example) You would get your present symptoms if you upgraded
Peter Wallace
Mesa Electronics
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