
B–70115EN/03
E. CONTROL SEQUENCES
IN LASER OSCILLATOR
APPENDIX
449
[SEQ 0] POWER OFF state
This is the state prior to power on where all the signals are in off state.
[SEQ 10] INITIAL state
After power is turned on, laser comes into PURGE=1 state. This signal
is on when atmospheric pressure sensor monitors that the intra–tube
pressure equals atmospheric pressure. Usually when this signal is on,
purge completion lamp on operational board is lit.
[SEQ 20] READY OF DISCHARGING state
When oscillator start switch is turned on, evacuation is carried on and then
gas pressure control begins. When gas pressure reaches the set value, laser
comes into discharge preparation completion (LRDY) state and it
becomes possible to turn on HV.
[SEQ 30] READY OF BEAM–ON OPERATION state
When HV (high voltage command) is turned on, high voltage is applied
to discharge tube. Then with the command from CNC, base discharge is
established. Further intra–tube pressure control is performed. When this
is completed normally, laser comes into oscillation preparation
completion state.
Sequence
number
Meaning
10 Initial state (purge completed state)
11 State waiting for the REV signal when RUN is turned on again
12 Purge operation being performed
13 State waiting for the rotation sensor to be turned on when
RUN is off
14 State waiting 75 seconds
16 Execution with RUN turned on
17 State waiting for exhaust completion and negative pressure
arrival
18 State waiting for the AR signal to be turned on
20 LRDY state
23 State waiting for setting from gas pressure during laser oscilla-
tion to discharge start time gas pressure
26 Execution with HV ON (state waiting for start of discharge)
27 State waiting for setting from a maximum base discharge val-
ue to base discharge state
28 Power calibration being performed
30 LSTR state
49 Vacuum being drawn with RUN turned off (parameter No.
15256)
50 State waiting 75 seconds with RUN turned on again