
4. SERVO FUNCTION DETAILS B-65150E/04
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4.17.3 Velocity Feedback Averaging Function
As can be seen from the tandem control block diagram shown in Fig.
4.17.11 (a) in Subsec. 4.17.11, velocity control is not applied to the
sub-axis motor. For this reason, the sub-axis may vibrate and become
unstable due to a backlash such as, for example, in the gears, in a
machine with a large backlash. In such a case, the machine can be
made stable by applying velocity control to the sub-axis as well. This
function is referred to as the velocity feedback averaging function.
#7 #6 #5 #4 #3 #2 #1 #0
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VFBAVE
2008
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VFBAVE (#2) 1: Enables the velocity feedback averaging function. Usually, set this
bit to 1. (Set this parameter for the main axis only.)
(Series 9060/F(06) and subsequent editions)
(Series 9080/A(01) and subsequent editions)
(Series 9090/C(03) and subsequent editions)
(Series 90A0/A(01) and subsequent editions)
NOTE
For some machines, a position deviation may change
largely at low averaging precision, depending on the
direction of movement.
This problem will not happen in the following editions
because the averaging precision has been improved.
Series 9090/K(11) and subsequent editions, and
90A0/G(07) and subsequent editions