Service Troubleshooting; Introduction; Periodic Inspection & Maintenance; Common Cutting Faults - Firepower FP-18 Service Manual

B. Dimensions
10.0 in.
(254 mm)
16.0 in
(406 mm)
Figure 2-1 Power Supply Dimensions
1.06 in (27 mm)
7.98 in (203 mm)
Figure 2-4 Torch Dimensions
3.0: SERVICE
TROUBLESHOOTING

3.1 Introduction

This section provides service diagnostics for the Fire-
power FP-18 Plasma Cutter with PCH-10 Torch, aiding
the technician 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.
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.
Firepower FP-18 Plasma Cutter
A-02004
9.0 in
(229 mm)
2.95 in
(75 mm)
A-02006
WARNING
3.2 Periodic Inspection &
Maintenance
The Firepower FP-18 Operating Manual 0-2691, 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
supply and torch maintenance.

3.3 Common Cutting Faults

Poor or lackluster performance can often be improved
by slight modifications to technique or equipment. For
example:
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
8 Service Manual 0-2692