OPERATION
B–63664EN/02
15. LASER FUNCTION
769
The power compensation function prevents the actual output power from
becoming less than the specified power because of a dirty mirror or other
reasons.
Procedure for power compensation
1 Setting the parameters
No. 15000#4 : Power compensation enable/ disable
No. 15200 : Power compensation command output when half of
all discharge tubes are used.
No. 15201 : Power compensation command output when all the
discharge tubes are used.
No. 15203 : Power compensation limit.
No. 15204 : Power compensation coefficient
No. 15205 : Power compensation time.
Please refer the parameter sheet attached the laser oscillator.
2 Generating the laser oscillator
If the laser is discharged by setting the HV on, the power specified in
parameter No. 15200 or No. 15201 becomes effective.
The function compares the specified power with the actual power and
calculates a power compensation
coefficient.
Calculating the Power compensation coefficient as follows.
Cp= (Pc/Pa) ∗1024
Cp : Power compensation coefficient
Pa : Actual Power
Pc : Command power (PRM No. 15200 or No. 15201)
Outputting laser beam with shutter close by setting power for setting time,
and read the actual laser power from the power sensor when the laser is
generated.
The commanding power to laser oscillator becomes as follows.
Pl=Cp∗Pp/ 1024
Pl : Commanding power to laser oscillator
Cp : Power compensation coefficient
Pp : Power commanded in a part program
If the calculated power compensation coefficient exceeds the power
compensation limit (PRM No. 15203), the value is clamped at the limit.
When this occurs, the system displays a message indicating that the
mirror needs to be cleaned and outputs the MWRN signal (F220#6) to
report that it is time to clean the mirror.
The alarm can be released by resetting the system, but the MWRN signal
is continued to output till the system power off.
When the function is invalidated with the parameter, the power
compensation coefficient is set 1024.
15.3
POWER
COMPENSATION
Procedure
Explanations
D Power compensation
coefficient
D Commanding the power
D Requiring mirror clean
Limitations