Backlash Compensation - Omron C200H-MC221 Operation Manual

Backlash Compensation

Override in CP Control
5-9 Backlash Compensation
In interpolation control, the designated interpolation feed rate is used as the
maximum feed rate. The override for the interpolation feed rate can be set to a
value between 0.1% and 199.9%. If the result set by using the override function
to over 100% exceeds the maximum interpolation speed, maximum interpola-
tion feed rate is used instead. Unlike the PTP control, the acceleration and de-
celeration times remain constant regardless of the override set value and, as a
result, the acceleration and deceleration rates vary.
A backlash is a sudden backward movement of a driving axis that may be
caused due to mechanical looseness as shown in the following illustration.
Backlash space
The positioning of a machine cannot be performed precisely if there is a back-
lash.
As shown in the following illustration, the position of a machine moved 100 mm
in the forward direction is different from that of the same machine moved 100
mm in the reverse direction if there is a backlash even though there is no differ-
ence in position between the driving axes.
Positioning in the
forward direction
No difference in
position between
the driving axes
Section 5-9
Machine to be driven
Driving axis (eg: bolt)
Difference in position due to backlash
Positioning in the
reverse direction
45