
B–70115EN/03
9. SETTING AND ADJUSTMENT
267
This coefficient is precisely adjusted at the factory and should not require
any further adjustment. If the rear mirror of the laser oscillator or the
power sensor unit is replaced, however, the power input compensation
coefficient should be checked and set as described below.
The coefficient is set by measuring the laser beam. Always apply the
safety precautions related to laser beams, as explained in Chapter 2.
(1)Change the following parameter settings:
Parameter 15208 (16–L, 16i–L) or 233 (0–L) ³
Predetermined value (Enable output feedback)
Parameter 15209 (16–L, 16i–L) or 234 (0–L) ³
Predetermined value (Enable output feedback)
(2)Set the laser oscillator to the base discharge state (LSTR). Check
whether the oscillator alignment is optimized, by following the
procedure described in Chapter 11. If not, repeat the adjustment.
(3)Execute an internal discharge at the rated output for one minute or
longer. Run the following program in automatic mode. Measure laser
output value Pr with a laser power meter (Model P2000C
manufactured by Optical Engineer, Ltd., for example). It is
recommended that measurement be performed just behind the beam
panel. While measuring Pr, record laser output value Pa, detected by
the internal sensor and displayed on the laser setting screen.
G32 P1 Q1 ;
G24 S1500 Q100 R20000
;
G32 P0 ; (Radiation of 20 seconds duration)
M30
Specify S2000 for the C2000B/C2000C or S3000 for the
C3000C/C3000D.
To change the duration of the radiation applied to the power probe,
calculate the duration based on the probe display output.
(4)If power input compensation coefficient K in parameter 15215 [259]
is correct, Pa should match Pr. If there is a difference between Pa and
Pr and if the difference is "5% of Pr or greater, set the value obtained
from the following expression as power input compensation
coefficient K [Parameter 15215 (16–L) or 259 (0–L)].
K (new value) =
Pr’ (calculated from probe output)/Pa K (old value)
(5)Repeat step (2) above. Check that Pa equals Pr.
(6)This completes the setting.
9.6
SETTING THE
POWER INPUT
COMPENSATION
COEFFICIENT