
B-70255EN/01 10.REPLACEMENT PROCEDURES
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10.13.4 REPLACING THE BEAM ABSORBER
Replace the beam absorber as follows:
(1) Turn off the power to the CNC, then turn off the power to the
laser oscillator. In addition, open the main circuit breaker for the
laser oscillator.
(2) The beam absorber is water-cooled. Drain the water from the
beam absorber, then disconnect the water pipes. To drain the
cooling water, open the drain valve of the water distribution unit.
(3) Disconnect the temperature sensor Faston terminal.
(4) Remove the bolts, then remove the absorber. Before removing
the absorber, mark the position of the absorber or mounting
metal bracket. If the position of the absorber is shifted as a result
of the replacement, the laser beam is not directed to the center of
the absorber. In such a case, the absorber must be adjusted.
(5) Mount a new absorber, aligning it with the marked position.
(6) Connect the water tubes and temperature sensor cable.
(7) Operate the chiller unit manually to circulate the cooling water.
Check that no water leaks from the joints that were disconnected
during the replacement. After checking, restore the original
chiller setting.
(8) Close the main circuit breaker, turn on the power to the oscillator,
then turn on the power to the CNC. Check the position of the
absorber, as described below.
Adjusting the absorber position
(1) Draw a cross on an acrylic plate, then fix the plate such that the
center of the cross is aligned with the center of the absorber
aperture.
(2) Provide a flow of cooling air to the acrylic plate, using a drier,
for example.
(3) Turn on the oscillator, then press the high voltage switch.
Monitor the output display screen. Once the output reaches 300
to 500 W, immediately turn off the high voltage switch. During
this period, a laser beam is output, leaving a circular mark on the
acrylic plate.
(4) Adjust the absorber such that the mark on the acrylic plate is
aligned with the center of the absorber.