C N C 4 2 2 0 M a c hi ne Too l Op e ra t ion an d Te st
68
②
Origin process
A: Select the mechanical origin mode, press the manual forward feeding key, and the
corresponding axis moves to origin in high speed
B: When the approach switch detects the block for the first time, the speed drops immediately
and runs in fixed low speed reversely
C: When the approach switch leaves the block, runs reversely in the decelerated speed, and starts
checking the origin signal
D: When the approach switch detects the block for the second time, the origin signal is valid,
the movement stops and the mechanical origin operation completes
II. Use one approach switch and servo origin as the mechanical origin of origin signal
A: Select the mechanical origin mode, press the manual forward feeding key, and the
corresponding axis moves to origin in high speed
B: When the approach switch detects the block, the speed drops immediately and runs in fixed
low speed, and starts checking the origin signal
C: When it detects the servo origin for the first time, it runs reversely in fixed low speed
D: If no servo origin signal is detected, it runs reversely in fixed low speed, and starts checking
the servo origin signal (DEC). When it detects the servo origin signal for the second time, the
origin signal is valid, the movement stops and the mechanical origin operation completes.
13.3.2
TROUBLESHOOTING FOR MECHANICAL ORIGIN
A. The origin direction is reversed: the parameter of origin direction is reversed; please
modify the parameter.
B. The motor desynchronizes in the origin process: the origin speed is too high; please change
it to appropriate value.
C. Overtravel occurs in the origin process: the origin switch is invalid; please check whether
the origin switch and wiring are normal
13.4.
Reverse clearance compensation
Measure with dial indicator, dial gauge or laser detector. The reverse clearance should be
compensated accurately to improve the processing accuracy. Therefore, it isn’t recommended
to measure the reverse clearance of screw in handwheel or single step mode. Please measure
the reverse clearance in the method below:
Edit program:
O0001;
N10 G01 W10 F800;
N20
W15;
N30
W1;
N40
W-1;
Connect to 0V
Connect to +24V
NC type approach switch
Metal sensing block installed
on the machine tool
Direction to mechanical origin
DECN signal
about 8mm
