Thermadyne Thermal Dynamics PAK MASTER 50XL, Service Manual

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SERVICE TROUBLESHOOTING 14 Manual 0-2587
it is sometimes useful to reduce the cutting speed to
produce "slow speed dross". Any resultant cleanup
can be accomplished by scraping, not grinding.
F. Common Cutting Faults
1. Insufficient Penetration
a. Cutting speed too fast
b. Torch tilted too much
c. Metal too thick
d. Worn torch parts
e. Cutting current too low
2. Main Arc Extinguishes
a. Cutting speed too slow
b. Torch standoff too high from workpiece
c. Cutting current too high
d. Work cable disconnected
e. Worn torch parts
3. Excessive Dross Formation
a. Cutting speed too slow
b. Torch standoff too high from workpiece
c. Worn torch parts
d. Improper cutting current
4. Short Torch Parts Life
a. Oil or moisture in air source
b. Exceeding system capability (material too thick)
c. Excessive pilot arc time
d. Air flow too low (incorrect pressure)
e. Improperly assembled torch
f. Incorrect torch parts for the operation
g. Non-Genuine Thermal Dynamics parts used
4.04 Troubleshooting Guide -
General Information
WARNING
There are extremely dangerous voltage and power
levels present inside this unit. Do not attempt to
diagnose or repair unless you have had training in
power electronics measurement and troubleshoot-
ing techniques.
A. Troubleshooting and Repair
Troubleshooting and repair of this unit is a process which
should be undertaken only by those familiar with high
voltage high power electronic equipment.
B. Advanced Troubleshooting
NOTE
For basic troubleshooting and parts replacement
procedures refer to Pak Master 50XL Operating
Manual 0-2586.
The advanced troubleshooting covered in this Service
Manual requires Power Supply disassembly and live mea-
surements. It is helpful for solving many of the common
problems that can arise with the Pak Master 50XL Power
Supply.
If major complex subassemblies are faulty, the faulty sub-
assembly must be returned for repair.
NOTE
Follow all instructions as listed and complete each
in the order presented.
Sub-section 4.09 includes specific test procedures and LED
status identification tables. The sub-section is referenced
by the troubleshooting guide for the specific test to be
performed.
The troubleshooting guide has six sub-sections as follows:
Section 4.05 - Circuit Fault Isolation
Section 4.06 - Main Input and Internal Power Prob-
lems
Section 4.07 - Pilot Arc Problems
Section 4.08 - Main Arc Problems
Section 4.09 - Test Procedures