
B–70114EN/04
6. TROUBLESHOOTING
151
Anomaly of gas pressure control (Refer to DGN = 905 [860]
Pressing the RUN (pressure control start) button starts expelling air from
the laser gas tube. When a specified degree of vacuum is attained, laser
gas is supplied into the laser gas tube, and gas pressure control begins.
Forty–five seconds after the turbo blower is started, a check is made to see
whether the vacuum in the laser gas tube has reached to the level specified
in parameter No. 15241 [0237] "20. If the specified level has not been
reached, this alarm is issued. When there is no abnormal condition, a
discharge start ready condition (LRDY) is set up.
No. Cause of trouble Solution
1 Anomaly of parameter set-
ting of gas pressure control
Check whether bit 1 of parameter No.
15000 [bit 1 of 200], and parameter Nos.
15244 [0264], 15245 [0207], and 15246
[0246] are set as specified in the at-
tached data sheet.
2 Anomaly of supply laser gas
pressure
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.
3 Gas leakage from the inter-
nal piping
Call the FANUC service center.
4 IF PCB abnormal
5 Anomaly of pressure sensor
6 Anomaly of pressure control
valve
Anomaly of pressure sensor (Refer to DGN = 905 [860]
This alarm appears when the signal of the pressure sensor used for
pressure control detector vanishes.
No. Cause of trouble Solution
1 Anomaly of connection
cable
Call the FANUC service center.
2 Anomaly of IF PCB
3 Anomaly of pressure sensor
Alarm No. 4081 [681]
Alarm No. 4082 [682]