
B–70115EN/03
10. REPLACEMENT PROCEDURES
302
When the exhaust control unit is replaced, the gas circulating system is
open to the atmosphere for a long time. Pay particular attention to the
immediate surroundings to ensure that dust and other contaminants do not
enter the gas circulating system.
Replace the exhaust control 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)Disconnect the tubes and cables from the control unit.
(3)Remove the unit securing screws, then remove the unit.
(4)Mount a new unit by reversing steps (2) and (3). Ensure that all tubes
are connected and tightened, and that the cables are connected
correctly.
(5)Perform all settings as described in Section 9.5, then check the
operation. If a laser gas flowmeter is not provided, adjust the exhaust
valve of the new exhaust control unit such that the amount by which
it opens (the angle and number of turns by which the valve is open
relative to the fully closed state) is the same as that of the exhaust valve
of the removed control unit.
Fig. 10.9 (a) Exhaust control unit C1500B
10.9
REPLACING THE
EXHAUST CONTROL
UNIT