Manual 0-2728
4-11
SERVICE TROUBLESHOOTING
D. AC indicator ON; Gas flows; GAS and DC indica-
tors ON; Spark at gap on CD PC Board and CD
enable indicator (D25) on Logic PC Board ON; No
arc or intermittent arc in torch
1. Gas pressure(s) set incorrectly (too high)
a. Check gas pressures. Plasma Gas Pressure
should be 65 psi (4.5 bar), and Secondary Gas
Pressure should be 60 psi (4.1 bar).
2. Oil/moisture in air lines
a. Purge system. If problem corrected add filters
in line with air source
3. Incorrect torch parts
a. Refer to appropriate Torch Instruction Manual
4. Faulty leads
a. Check continuity per appropriate Torch In-
struction Manual
5. Faulty torch
a. Check continuity per appropriate Torch In-
struction Manual
6. Faulty connection of wire #15 or #17 to Pilot Output
PC Board or pilot inductor wires reversed with wire
#17.
a. Check wiring connection
7. Faulty Pilot Output PC Board
a. D5 on the Pilot PC Board should turn on two
seconds after the torch switch is closed.
• If D5 does turn on, install a jumper between
E22 and E8 on the Pilot PC Board. If unit
will pilot with jumper installed, replace the
Output PC Board.
• If D5 does not turn on, measure the 12 vdc
to drop to less than 2 vdc between J13-18
& J13-17 two seconds after torch switch is
closed. If voltage does drop, then measure
for 36 VAC between J13-14 & J13-15. If
36VAC is found then replace the Pilot/Out-
put PC Board.
8. Faulty Logic PC Board
a. If the voltage between J13-18 & J13-17 on the
Pilot/Output PC Board does not drop to less
than 2 vdc two seconds after the torch switch
is pressed, replace the Logic PC Board.
4.09 Main Cutting Arc Problems
NOTE
Refer to the Appendix Pages for PC Board Lay-
outs.
Locate your symptom below:
A. Main cutting arc will not initiate
1. Work cable not connected.
a. Connect work cable.
2. Faulty INR Inrush Contactor
a. While attempting to transfer, measure for 0 vdc
at input PC Board between E1 and E8.
• If the voltage is correct, then replace the
INR Inrush Contactor.
• If voltage is not 0 vdc then measure for
120VAC at INR inrush contactor coil wires
#68 and #69.
3. Faulty Logic PC Board
a. If 120VAC is not found at INR Inrush Contactor
wires #68 and #69, measure for 120VAC at the
Logic PC Board between J2-4 to J4-8.
• If 120VAC is not present, replace the Logic
PC Board.
• If 120VAC is present, check wiring.
4. Faulty Current Sensor PC Board
Check the following:
a. While trying to initiate main cutting arc, mea-
sure the voltage at J99-6 to J99-7 (or TP 10 to
Gnd) indicators inside the Power Supply.
• If voltage is approximately 12 vdc replace
the Current Sensor.
• If voltage is less than 2 vdc replace the
Logic PC Board.
5. Faulty Transfer Mod Enable Signal
a. Test this Signal by measuring J4-6 to J4-8.
• If voltage approximately 12 vdc, replace
Logic Board
• If 0 vdc, replace Gate Drive Board
Содержание PAK Master 150XL
Страница 2: ......
Страница 6: ......
Страница 16: ...INTRODUCTION 2 2 Manual 0 2728...
Страница 61: ...Manual 0 2728 6 5 PARTS LISTS 7 1 2 6 3 A 02580 8 5 4 10 9 9...
Страница 65: ...Manual 0 2728 6 9 PARTS LISTS 1 3 4 2 A 02278 7 8 5 6 23x4274 11 13 12 16 17 18 19 14 15 20 9 10 21...
Страница 67: ...Manual 0 2728 6 11 PARTS LISTS 8 9 10 4 14 5 6 5 8 9 10 4 14 12 11 2 13 7 3 3 1 20 19 15 17 16 18 21 A 02387...
Страница 86: ...APPENDIX A 18 Manual 0 2728 APPENDIX 14 SYSTEM SCHEMATIC Unit Rev AQ or Earlier A 02329...
Страница 88: ...APPENDIX A 20 Manual 0 2728 APPENDIX 14 SYSTEM SCHEMATIC Unit Rev AR or Later A 03054...
Страница 90: ......
