
B–70114EN/04
6. TROUBLESHOOTING
147
Anomaly of assist gas (Refer to DGN = G221/bit 7 [145/bit7]
When starting machining, the NC monitors for a ready signal from the
assist gas supply unit in the machine. If this signal is not sent normally,
the NC issues this alarm.
Check the operation of the assist gas supply unit. Also check whether
there is the assist gas.
This alarm is issued also when in G32Pa Qb , a is not 0 to 3, or b is not
1 to 7 during program execution.
Shortage of cooling water (Refer to DGN = 961/bit 1 [840/bit 1])
This alarm appears when the water shortage takes place.
No. Cause of trouble Solution
1 Shortage of cooling water The water flow from the chiller unit is in-
sufficient, or the water flow is decreased
due to a clogged pipe. Check the dis-
charge pressure of the pump, or clean
the inside of the pipe.
2 Anomaly of connecting
cables
A sensor cable has come off the termi-
nal or is broken. Call the FANUC ser-
vice center.
3 Anomaly of water flow rate
sensor
If the flow meter provided outside the
oscillator indicates that there is a rated
water flow, the water level sensor may
be clogged with dust or scum, or may be
defective. Call the FANUC service cen-
ter.
Decrease of laser gas pressure (Refer to DGN = 960/bit 5 [840/bit 4])
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 (1 kgf/cm
2
).
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 la-
ser oscillator is 1 to 2 bar (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 cylin-
der.
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
The sensor is defective, or set incorrect-
ly. Alternatively, the connector is at-
tached incorrectly. Call the FANUC ser-
vice center.
Alarm No. 4071 [671]
Alarm No. 4072 [672]
Alarm No. 4073 [673]