Manual 0-2683 11 TROUBLE-SHOOTING
3.0: TROUBLESHOOTING
3.1 Introduction
This section provides service diagnostics for the DRAG-
GUN Plasma Cutter with PCH-10 Torch, aiding the tech-
nician to isolate faulty subassemblies.
Under no circumstances are field repairs to be attempted
on Printed Circuit Boards or other subassemblies of this
unit. Evidence of unauthorized repairs will void the fac-
tory warranty.
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.
3.2 Periodic Inspection &
Maintenance
The DRAG-GUN Operating Manual 0-2682, describes the
inspection and maintenance procedures which should be
performed at periodic intervals. Routine Maintenance
ensures optimum performance of equipment and can pre-
vent the user from encountering problems with this equip-
ment. Refer to that manual for instructions on power sup-
ply and torch maintenance.
3.3 Common Cutting Faults
Poor or lackluster performance can often be improved by
slight modifications to technique or equipment. For ex-
ample:
A. Insufficient Penetration
1. Cutting speed too fast
2. Torch tilted too much
3. Metal too thick
4. Worn torch parts
5. Standoff too high
6. Line voltage too low
7. Extension cord with inadequate rating
B. Main Arc Extinguishes
1. Cutting speed too slow
2. Torch standoff too high from workpiece
3. Work cable disconnected
4. Worn torch parts
C. Excessive Dross Formation
1. Cutting speed too slow
2. Torch standoff too high from workpiece
3. Worn torch parts
D. Short Torch Parts Life
1. Exceeding system capability (material too thick)
2. Excessive pilot arc time
3. Improperly assembled torch
4. Inadequate air supply (check filter on Compressor)
5. Faulty Air Compressor
6. Ground or work lead not connected
3.4 Common Operating Problems
Getting used to the way the system sounds and feels while
it is operating properly will help to determine the nature
of problems if they arise.
A. Compressor Related
If the unit is cold, the Air Compressor may not start up or
may run sluggishly. Most likely, when the torch switch is
depressed, the unit will click once and nothing more will
happen. Let the unit warm up to room temperature, ap-
proximately 50° F (10° C ) and try again.
If the air filter on the compressor becomes clogged, the
compressor may sound more labored, cut speed and qual-
ity will be reduced, and the arc may have a more green
color. The air filter element can be cleaned - remove it,
blow air through it, then reinstall it.
To Next Page
Loading...
Need help?
General
