MPH-02, MPB-02, MPD-02
Drive Functions
8-55
DOK-INDRV*-MP*-02VRS**-FK01-EN-P
Backlash on Reversal Correction
By means of the backlash on reversal correction it is possible to correct
play in the mechanical axis system.
backlash of toothed wheels
causes play in transmission
of rotary motion
Mb5001d2.fh7
Fig. 8-31:
Illustration of play with toothed wheels
The function is activated by inputting the play in parameter
S-0-0058,
Reversal clearance
. The actual position values of the encoder selected
via
P-0-0413
are corrected with the value from S-0-0058 (taking the
direction of motion into account).
Positive or negative direction of motion is detected, when
•
in the case of position control, the time-related change of position
command value (corresponding to velocity feedforward value in the
case of lagless position control),
•
in the case of velocity control, the velocity command value (S-0-0036)
has exceeded the absolute value of the standstill window (S-0-0124) in
positive or negative direction. The standstill window acts as hysteresis!
Sv5173f1.fh7
S-0-0036,
Velocity command value or
position cmd val. difference
P-0-0401,
Axis corr. active correction
value (correction value for
actual position value)
S-0-0124, Standstill window
S-0-0058,
Reversal clearance
Fig. 8-32: Operating principle of backlash on reversal correction, hysteresis when
changing direction of motion
Courtesy
of
CMA/Flodyne/Hydradyne
▪
Motion
Control
▪
Hydraulic
▪
Pneumatic
▪
Electrical
▪
Mechanical
▪
(800)
426-5480
▪
www.cmafh.com