
5.TROUBLESHOOTING B-70254EN/01
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ALM No.4082
Anomaly of pressure sensor
This alarm appears when the signal of the pressure sensor used
vanishes.
No. Cause of trouble Solution
1 Open or poor contact in
connection cable
between pressure sensor
and IF PCB
2 Anomaly of IF PCB
3 Anomaly of pressure
sensor
It is necessary to replace or adjust the part.
Call the FANUC service center.
ALM No.4083
Shutter failure to open
This alarm occurs when the shutter does not reach the correct
position at a certain time (pre-flow time of assist gas) after the
shutter open command.
No. Cause of trouble Solution
1 The pre-flow time of
assist gas is too short for
the shutter to open.
Adjust the pre-flow time on setting screen. It
should be longer than 0.6 sec.
2 When beam output was
specified, other alarm
was issued.
Check the cause of occurred alarm, then take
appropriate action.
3 Movable part caught It is necessary to replace or clean the part.
Call the FANUC service center.
ALM No.4085
Decrease of laser output power
This alarm appears when the laser output power decreases and
takes an abnormally higher calibration coefficient.
No. Cause of trouble Solution
1 An optical part in the
laser resonator is out of
position.
2 An optical part in the
laser resonator is dirty.
It is necessary to align the laser resonator or to
clean or replace an optical part.
Call the FANUC service center.
3 The supplied laser gas is
not the one specified.
Replace the laser gas with the specified one,
that is CO
2
:N2:He = 5:55:40% (volume ratio)
with a composition ratio accuracy of ±5%.
4 Cooling water
temperature out of
specified range
Check whether the temperature of cooling water
falls within the range of 20 to 30°C.
5 Laser oscillator ambient
temperature out of
specified range
Check whether the ambient temperature falls
within the range of 5 to 30°C.