7.UNITS B-70315EN/02
- 192 -
7.8 EXHAUST PUMP
7.8.1 Replacement Method
(1) Turn off the power to the CNC, then turn off the main circuit
breaker and power supply for the laser oscillator. Turn off the
power to the chiller unit.
(2) Drain the cooling water from the oscillator, then disconnect the
two water tubes.
(3) Disconnect the tubes from the pump outlet and inlet. Then,
disconnect the heavy-duty power cables from the terminal block
on the side of the pump.
(4) Remove the bolts securing the exhaust pump unit, then remove
the pump unit. Remove the bolts securing the pump to the
mounting plate, then remove the pump.
(5) Position the new exhaust pump on the mounting plate, then
secure the pump unit by reversing steps (2) to (4). The new pump
may not be fitted with gas and water fittings. Remove them from
the old pump, bind seal tape on the threaded part, and install
them in the original positions.
(6) Pumps are shipped without lubricating oil. Add oil to the pumps.
Operating the pump without lubricating oil will cause the thermal
switch to trip, and will ultimately damage the pump.
(7) Start the oscillator, perform leakage tests for the laser oscillator,
and check the operation of the exhaust pump.
When the power is first turned on, check that gas is output from
the gas outlet of the oscillator. The pump starts after gas has been
discharged from the external pipes for a few seconds. If no gas is
discharged, or the pump sounds abnormally, the pump turns
reversely. Check the cabling.