
5.TROUBLESHOOTING B-70254EN/01
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ALM No.4072
Shortage of cooling water
This alarm appears when the water shortage takes place.
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.
This alarm is issued if cooling water is
supplied at a flow rate even slightly below the
specified value.
2 Anomaly of sensor cable
3 Anomaly of water flow
rate sensor
It is necessary to replace or adjust the part.
Call the FANUC service center.
ALM No.4073
Decrease of laser gas pressure
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.
No. Cause of trouble Solution
1 Tool low supply pressure
of laser gas
Adjust the secondary pressure at the regulator
on the gas cylinder so that the pressure of laser
gas supplied to the laser oscillator is 0.15MPa
(rating) as measured at the entry of the
oscillator. If the distance between the gas
cylinder and the oscillator is larger than 5 m, it is
necessary to set the pressure slightly higher.
2 No laser gas. Check whether the gas cylinder is empty or
whether the connection valve is closed. If
empty, replace the gas cylinder.
3 Leakage from the gas
tube leading to the
oscillator
Check that the gas pipe joint is secure. Also
check whether the tube or pipe is broken. If so,
replace it.
4 Gas supply pressure
sensor or cable abnormal
It is necessary to replace or adjust the part.
Call the FANUC service center.