
B–70115EN/03
10. REPLACEMENT PROCEDURES
306
The laser oscillator contains many fan units, which are classified into the
following two types:
(1)Fan unit
Consists of several fans and a terminal block.
(2)Fan–assisted radiator
Consists of a water–cooled radiator, several fans, and a terminal block.
The replacement of each type of fan unit is described below.
Replace a fan 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)Remove the panel from the oscillator.
(3)Disconnect the Faston terminal and ground cable from the terminal
block.
(4)Remove the fan unit from the oscillator.
(5)Mount a new fan unit, then secure it by tightening the screws. Before
tightening the screws, however, check that the damping rubber is
fitted. Otherwise, the screws cannot be tightened.
(6)Connect the Faston terminal and ground cable.
(7)Close the main circuit breaker, turn on the power to the oscillator, then
turn on the power to the CNC. Then, check that the fans rotate.
Replace a fan–assisted radiator 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) Cooling water is passed through the radiator of the fan unit. Drain
the water from the radiator, then disconnect the water pipes. To drain
the cooling water, open the drain valve of the water distribution unit.
(3) Remove the panel from the oscillator.
(4) Disconnect the Faston terminal and ground cable from the terminal
block.
(5) Remove the fan unit from the oscillator. At this time, the radiator
may still contain water. Therefore, plug the radiator joints with rag
to prevent water being spilled on the other units.
(6) Mount a new fan unit, then secure it by tightening the screws. Before
tightening the screws, however, check that the damping rubber is
mounted. Otherwise, the screws cannot be tightened.
(7) Connect the water tubes.
(8) Connect the Faston terminal and ground cable.
(9) 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.
(10)Close the main circuit breaker, turn on the power to the oscillator,
then turn on the power to the CNC. Then, check that the fans rotate.
10.11
REPLACING A FAN
UNIT
10.11.1
Replacing a Fan Unit
10.11.2
Replacing a
Fan–assisted Radiator