
B-70255EN/01 4.INSTALLATION
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(6) Check the gas pressure on the diagnosis screen to determine
whether there is any increase in pressure over 15 minutes. An
increase in pressure of within 10 is normal.
(7) After completing the check, turn on the start switch. Then, after
two to three seconds, turn off the switch. The oscillator will
perform a purge operation after 75 seconds.
(8) Finally, restore the parameter settings to their original values.
Locating a leakage
When there is a gas leakage, locate the leakage by using a leakage
checker or liquid leakage checker.
CAUTION
The turbo blower is not designed for pressure
application. If pressure must be applied, the upper
pressure limit is 0.08 MPa. Never apply pressure
higher than 0.08 Mpa. Applying a high pressure may
damage the connector, oil gage, and so on. To
prevent the connector from being damaged, apply
pressure with the cable left attached to the turbo
blower.
(1) Turn on the power to the oscillator, then open the valve of the
gas cylinder.
(2) Set the secondary pressure of the regulator of the laser gas
cylinder to 0.05 MPa.
(3) To make the pressure in the oscillator higher than the
atmospheric pressure, increase the atmospheric pressure sensor
(PWS2) setting by 0.02. (See Section 9.4.)
(4) Set the RUN key of the oscillator to ON, wait for two to three
seconds, then set the key to OFF. Wait until purge operation
starts.
(5) Place the leakage checker at a possibly faulty position where gas
seems to leak. If there is a leakage, the checker indicates it by
display or sound. When using the liquid leakage checker, drip
the liquid on a possibly faulty position. If gas leaks, bubbles
appear, so you can determine the location of a leakage.
NOTE
The leakage checker detects helium in the laser gas.
If ambient air flows, detection becomes difficult. So,
a gas leakage check should be made in a nearly no-
wind condition.