
B-65270EN/05 4.SERVO FUNCTION DETAILS
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4.18.3 Velocity Feedback Average Function
As can be seen from the tandem control block diagram shown in Fig.
4.18.10(a) in Subsec. 4.18.10, 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 average function.
#7 #6 #5 #4 #3 #2 #1 #0
1952 (FS15i)
VFBAVE
2008 (FS30i, 16i)
VFBAVE (#2) 1: Enables the velocity feedback average function. Usually, set this
bit to 1. (Set this parameter for the main axis only.)
4.18.4 Servo Alarm 2-axis Simultaneous Monitor Function
If an alarm occurs in either of two axis motors used to operate a
machine in concert as in synchronization control or tandem control, it
is necessary to stop the other axis immediately so as to prevent the
machine from being twisted.
This function monitors two axes (controlled by the same DSP)
simultaneously for servo alarm conditions. If an alarm condition is
detected in either of the two axes, the function can promptly turn off
activation (Mcc) for the other axis.
This function is not confined to tandem axes. It can be used also axes
(controlled by the same DSP) under
synchronization control.
#7 #6 #5 #4 #3 #2 #1 #0
1951 (FS15i)
IGNVRO ESP2AX
2007 (FS30i, 16i)
ESP2AX (#0) 1: Enables the servo alarm two-axis monitor function.
(Set this parameter for the main axis only.)
IGNVRO(#1) 1: An alarm condition is released 2 seconds after the servo alarm 2-axis
simultaneous monitor function holds the alarm condition.
(Set this parameter for the main axis only.)
(Series 9096, and Series 90B0/B(02) and earlier editions are not
supported.)
Some systems have a configuration in which the ESP line of the PSM
is cut off with an interlocked machine door, independently of the
emergency stop button, for safety purposes. In these systems, the
amplifier is turned off with an emergency stop not in effect, and
therefore, a "V ready-off alarm" is occurred. This alarm is evaded by
using the "VRDY OFF alarm invalidation signal."