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MDS-D-SVJ3/SPJ3 Series Instruction Manual
4-4 Characteristics improvement
4-4-6 Improvement of overshooting
The phenomenon when the machine position goes past or exceeds the command during feed stopping is
called overshooting. Overshooting is compensated by overshooting compensation (OVS compensation).
Overshooting occurs due to the following two causes.
[1] Machine system torsion: Overshooting will occur mainly during rapid traverse settling.
[2] Machine system friction: Overshooting will occur mainly during one pulse feed.
Either phenomenon can be confirmed by measuring the position droop.
(1) Overshooting compensation (OVS compensation)
In OVS compensation, the overshooting is suppressed by subtracting the torque command set in the
parameters when the motor stops.
OVS compensation type 3 has a compensation effect for the overshooting during either rapid traverse
settling or pulse feed. To compensate overshooting during feed forward control, refer to the following
section "(2) Adjusting for feed forward control".
<Setting and adjustment methods>
[1] Set the servo function selection 1 (SV027: SSF1)/bit A, B. (OVS compensation type 3 will start.)
[2] Observe the position droop waveform using the D/A output, and increase the overshooting
compensation 1 (SV031: OVS1) value 1% at a time. Set the smallest value where the overshooting
does not occur. If SV042 (OVS2) is 0, the overshooting will be compensated in both the forward/
reverse directions with the OVS1 setting value.
[3] If the compensation amount is to be changed in the direction to be compensated, set the + direction
compensation value in OVS1 and the - direction compensation value in OVS2. If only one direction
is to be compensated, set the side not to be compensated as -1. The compensation direction
setting will be as reversed with the NC parameter CW/CCW setting.
0
0
0
0
Position
command
Position
droop
Time
Overshoo
t
Speed
FB
Position
droop
Time
Overshoot
[1] Overshooting during rapid traverse settling [2] Overshooting during pulse feed