SERVICE 5-12 Manual 0-4691
5
C. Main Input and Internal Power Tests
1. Connect main AC power to the unit.
2. Set the Power Supply ON/OFF switch to ON (up) and note the following:
• AC indicator steady ON
• Gas solenoid energizes (clicks)
• Main PCB Relay energizes, pulling in main input contactor (W1)
• TEMP Indicator OFF
• GAS Indicator ON if input pressure is sufficient for power supply operation. Minimum pressure for power supply
operation is lower than minimum for torch operation.
• Gas flows
• Fans operate
• DC indicator is OFF
3. Set the Power Supply RUN / RAPID AUTO RESTART / SET switch to the RUN (up) position and note the following:
• Gas flow stops
This completes the Main Input and Internal Power Tests. If the above are all correct then proceed to paragraph ‘D’. If not, note
the symptom and proceed to Subsection 5.05, Main Input and Internal Power Problems.
D. Pilot Arc Test
1. Activate the torch to establish a pilot arc and note the following:
• Gas flows
• Preflow delay (two seconds) then DC indicator turns ON
• Pilot arc is established
This completes the Pilot Arc Test. If the above are all correct then proceed to paragraph ‘E’. If the unit does not function properly,
then note the symptom and proceed to Subsection 5.06, Pilot Arc Problems.
E. Main Arc Test
Make sure the work cable is firmly connected to the workpiece. Activate the torch to establish a pilot arc.
Bring the torch to within 1/8"-3/8" (3-10 mm) of the workpiece to establish the main cutting arc, and note the following:
• Main cutting arc starts
This completes the Main Arc Test. If the above are all correct then the equipment should be operating properly. If problems still
persist then contact Technical Services.
If the torch does not function as noted then note the symptom and proceed to Subsection 5.07, Main Arc Problems.
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