7.UNITS B-70265EN/02
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7.2.2 Adjustment Method
The power supply is adjusted by adjusting the base discharge with
trimmer VR11 and adjusting the maximum power supply output with
trimmer VR13.
For the base discharge adjustment, it is important to have main
discharge of a discharge tube disappear and implement an electrical
shutter, and to maintain trigger discharge. When an attempt is made to
produce a laser output while no trigger discharge is present, the power
supply unit issues an alarm to protect the power supply unit itself.
Repeating this attempt several times applies stress to the power
supply unit and discharge tubes. For the maximum output adjustment,
it is important to make an adjustment so that the specified maximum
output for the power supply unit can be achieved. If the output
exceeds the maximum level, the power supply and discharge tubes
will be damaged. If the output is insufficient, the laser output
decreases.
7.2.2.1 Preparation
(1) Prepare the following tools:
(a) A cable to be connected to CN17 to measure DCI and
DCV.
(b) Precise screwdriver for trimmer adjustments
(c) Digital tester
(2) Check the S2 jumper pin setting (setting of the VR13 adjustment
range) against the data listed in Table 7.2.2.
(3) Check the S5 jumper pin setting (setting of the matching box
temperature sensor) against the data listed in Table 7.2.2.
* The S2 and S5 settings are initialized to the data listed in
Table 7.2.2 at the shipment of the power supply unit, so
they usually need not be changed.
(4) Connect the cable for measuring DCI and DCV to CN17.
7.2.2.2 Base discharge adjustment
Rewriting the parameter
Rewrite the following parameters: (Upon completion of adjustment,
return the parameters to the original values.)
CNC parameters Settings
1 PRM15000 bit 4, PRM15201 (Output compensation disable) 0
2 PRM 15208 (Laser power feedback disable) 0
3
PRM 15207,15210,15212 (Maximum output power)
Maximum
command
4 PRM 15223 (Bias command value) 2850
(1) Base discharge adjustment (C1000-E)
(a) Start the oscillator, and wait until the gas pressure is
stabilized in the base discharge state.