
5.TROUBLESHOOTING B-70315EN/02
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No. Cause of trouble Solution
2 Poor connection Check the connection between the assist
gas supply unit and CNC.
ALM No.4072
CHILL FLOW
This alarm appears when the water shortage takes place.
Alarm output condition
This alarm is issued if the cooling water amount signal becomes "0"
from the time the oscillator start switch is turned on until it is turned off
and the signal remains "0" when re-checked in five minutes.
Related data
DGN.961#0 *MVW Cooling water amount
No. Cause of trouble Solution
1 Shortage of cooling
water
1) The capacity of the chiller unit is insufficient,
or the water flow rate is reduced due to a
clogged pipe. Use a chiller unit having
sufficient capacity, or clean the piping.
2) Check whether the cooling water is
distributed normally throughout between the
external optical system and the laser
oscillator. Ensure that cooling water is
supplied to the laser oscillator at the specified
flow rate.
2 Anomaly of sensor
cable
Check the connection of each cable.
3 Anomaly of water flow
rate sensor
If this alarm is issued even when the specified
flow rate is satisfied, adjust (in Subsection
7.12.2), clean, or replace the water flow sensor.
ALM No.4073
LASER GAS PRES.
The pressure of the laser gas supplied to the laser oscillator is
monitored. This alarm is issued, if this pressure becomes lower
than the permissible level.
Alarm output condition
1) This alarm is issued if the laser gas supply pressure sensor signal
MGP becomes "0" from the time the oscillator start switch is turned
on until it is turned off.
The alarm monitor is masked while the purge valve is open and for
five seconds after the valve is closed, and while the exhaust valve of
the external piping is open and for five seconds after the valve is
closed.
2) This alarm is issued when purge operation is not completed in three
minutes after the start of purge operation.
3) When a laser gas mixing device is provided, this alarm is issued if
the tank supply pressure signal TEM becomes 0.
Related parameters
PRM.15009 #7 TEM Tank supply pressure (automatically rewritten with
the state signal from the mixer)
Related data
DGN.960 #5 *MGP Laser gas supply pressure sensor
DGN.972 #0 PUG Purge valve