Thermal Dynamics PAK Master 150XL, Руководство по обслуживанию

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Manual 0-2728 4-7 SERVICE TROUBLESHOOTING
Set the Power Supply RUN/SET switch to the RUN posi-
tion and note the following:
• Gas Indicator goes OFF
• Gas flow stops
NOTE
This unit has a 20 second pre-purge feature which
begins when the unit is turned ON. As long as the
RUN/SET Switch is in the SET position, the gas
will flow indefinitely. However, once the RUN/
SET Switch is placed in the RUN position, the gas
will stop flowing after approximately 20 seconds
(The 20 seconds begins from the time the unit is
turned on, not from when the unit was put in the
RUN position.)
This completes the Main Input and Internal Power Tests.
If the unit functions as described above, and all correct
then proceed to the Pilot Arc Test below.
If the unit does not function as noted then note the symp-
tom and proceed to Section 4.07, Main Input and Inter-
nal Power Problems.
C. Pilot Arc Test
Press the torch switch to establish a pilot arc and note the
following:
• Gas flows
• GAS indicator turns ON
• After preflow delay DC indicator turns ON
• Pilot arc established
This completes the Pilot Arc Test. If the above are all cor-
rect then proceed to the Main Arc Test below.
If the above does not function as noted then note the
symptom and proceed to Section 4.08, Pilot Arc Problems.
D. Main Arc Test
Press the Torch Switch to establish a pilot arc.
Bring the torch to within 1/8"-3/8" (3.2 - 9.5 mm) of the
workpiece to establish the main cutting arc, and note the
following:
• Main cutting arc initiates
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 above does not function as noted then note the
symptom and proceed to Section 4.09, Main Arc Prob-
lems.
4.07 Main Input and Internal Power
Problems
NOTES
The Input PC Board has a neon light on the upper
left hand corner. If AC power is present on L1, L2,
L3 of the Main Contactor, the light will be on.
Refer to the Appendix Pages for PC Board Lay-
outs, as required.
Locate your symptom below:
A. Main power line fuses blow as soon as main
disconnect is closed
1. Input power cable installed incorrectly
a. Refer to Operating Manual, Section 3.07, Input
Power Cable Connections, and connect input
cable
B. Main power line fuses blow when unit is powered
on
1. Input Bridge Faulty
a. Test Input Bridge Rectifier per Section 4.10-D;
repair as necessary
2. Faulty FET/Heatsink Assembly
a. Check per Section 4.10-K; repair as necessary
3. Faulty Input PC Board
a. Test Input PC Board per Section 4.10-D; repair
as necessary
C. AC indicator on front panel of power supply is
OFF
1. Front Panel ON/OFF switch in OFF position
a. Place switch to ON position
2. Main power disconnect not closed
a. Close main power disconnect
3. Customer's main power line fuses blown
a. Replace main power line Fuses
4. Input power not properly connected to customer's main
power panel
a. Check that input power is present and unit is
properly connected (refer to Operating
Manual, Section 3.05, Input Power Cable Con-
nections)