
B–70115EN/03
10. REPLACEMENT PROCEDURES
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Replace the water distribution unit 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)Drain all cooling water from the oscillator, using compressed air, for
example. Compressed air must be supplied only from the cooling
water inlet. Supplying compressed air from the cooling water outlet
may tangle the flow sensor balancer, such that it cannot operate. In
such a case, remove the flow sensor, as described in Section 10.17,
then mount it again.
(3)Remove the panel on the cooling water inlet/outlet side of the
oscillator.
(4)Mark the water pipes connected to the distribution unit, then
disconnect the pipes.
(5)Remove the bolts securing the distribution unit, then remove the unit.
(6)Mount a new distribution unit by reversing steps (4) and (5). Connect
the water pipes correctly, noting the alignment marks.
(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.
Check the amount of water in the chiller unit, and add water if
necessary.
(8)Adjust the flow sensor as described in Section 9.7. If the sensor of the
new unit cannot be adjusted for some reason, remove the flow sensor
from the old distribution unit, as described in Section 10.17, then
mount it on the new distribution unit.
10.16
REPLACING THE
WATER
DISTRIBUTION UNIT