
4.SERVO FUNCTION DETAILS B-65270EN/05
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4.18.2 Damping Compensation Function
To enable more stable tandem control, a torque offset can be applied
to the sub-axis, or to both the main- and sub-axes to eliminate a
difference in speed, if any, between the main- and sub-axes.
This function is particularly useful for controlling the vibration (with a
frequency of several Hz to 30 or 40 Hz) that may occur in a machine
system with low spring rigidity.
Kc
−
+
Damping compensation
Phase
compensation
Velocity feedback
Current
control
Main
motor
Detector
+
+
+
+
+
Preload (main)
Backlash
Spring
Preload (sub)
Current
control
Detector
Spring
Torque
command
Sub-
motor
Backlash
Table
Velocity feedback
+
Fig. 4.18.2 (a) Damping compensation function
#7 #6 #5 #4 #3 #2 #1 #0
1952 (FS15i)
LAXDMP
2008 (FS30i, 16i)
LAXDMP (#7) 1: Enables the damping compensation function for the main- and
sub-axes.
When LAXDMP (#7) = 0, the damping compensation function is
enabled for the sub-axis only.
Usually, set this bit to 1. (Set this parameter for the main axis
only.)