
B-65270EN/05 APPENDIX H.DETAILS OF HIGH-SPEED AND HIGH-PRECISION ADJUSTMENT
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(7) Adjustment of backlash acceleration
NOTE
The examples given below show the adjustment of
backlash acceleration in the Series 30i and 16i.
Even with other CNCs, the adjustment procedure is
the same. When using the Series 15i, however,
replace parameter Nos. according to the table
given below.
(a) Backlash acceleration function
A simple figure as shown below is formed by the compensation value
of backlash acceleration. The acceleration compensation value is
added to the velocity command to help inversion of the velocity
integral gain when the motor is reversed. This effect can reduce the
path error in the reverse operation.
(Standard backlash acceleration)
Basically, the above two parameters are considered. Parameter No.
2071 is the backlash acceleration time, and its recommended value is
20. Normally, this value need not be adjusted. Parameter No. 2048 is
the backlash acceleration amount. In the initial adjustment stage, set
100 in this parameter. Adjust this value while observing the arc figure.
(b) Setting initial parameters for backlash acceleration
Before starting backlash acceleration adjustment, set the following
initial parameters:
[Basic parameters for backlash acceleration]
Parameter No.
15i 30i,16i,etc.
Recommended value Description
1851 1851 1 or greater Backlash compensation
1808#5 2003 #5 1 Enables backlash acceleration function
1884#0 2006 #0 0/1 0: Semi-closed loop, 1: Full-closed loop
1953#7 2009 #7 1 Stop of backlash acceleration
2611#7 2223 #7 1 Enables backlash acceleration during cutting only.
1957#6 2015 #6 0 Disables the 2-stage backlash acceleration function.
1860 2048 100 Backlash acceleration amount
1975 2082
5 (1µm detection)
50(0.1µm detection)
Backlash acceleration stop distance (in detection unit)
1964 2071 20 Backlash acceleration time
No.2071
Velocity command
Backlash acceleration
No.2048