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SECTION 4
4.1 GENERAL
If this equipment does not operate properly, stop work
immediately and investigate the cause of the malfunc-
tion.
Maintenance work must be performed by an
experienced person, and electrical work by a trained
electrician. Do not permit untrained persons to inspect,
clean, or repair this equipment. Use only recommended
replacement parts.
Be sure that the wall disconnect switch or wall
circuit breaker is open before attempting any in-
spection or work inside of the PCM-50i.
4.2 INSPECTION AND CLEANING
Frequent inspection and cleaning of the PCM-50i is
recommended for safety and proper operation. Some
suggestions for inspecting and cleaning are as follows:
A.
Check work cable to workpiece connection.
B.
Check safety earth ground at workpiece and at
power source chassis.
C.
Check heat shield on torch. It should be replaced
if damaged.
D.
Check the torch electrode and cutting nozzle for
wear on a daily basis. Remove spatter, resharpen
point, or replace if necessary.
E.
Make sure cable and hoses are not damaged or
kinked.
F.
Make sure all plugs, fittings, and ground connec-
tions are tight.
G.
Remove or replace carrying strap annually, sooner
if weekly check shows wear or damage.
Water or oil occasionally accumulates in compressed
air lines. Be sure to direct the first blast of air away
from the equipment to avoid damage to the PCM-50i.
14
H.
With all input power disconnected, and wearing
proper eye and face protection, blow out the inside
of the PCM-50i using low-pressure dry compressed
air.
I.
Occasionally, bleed all water from the filter be-
neath the air filter-regulator.
4.3 PT-27 TORCH CONSUMABLE PARTS
Make sure power switch on PCM-50i is in OFF posi-
tion before working on the torch.
The PT-27 torch head contains a gas flow check
valve that acts in conjunction with the flow switch
and circuitry within the power source. This system
prevents the torch from being energized with high
voltage if the torch switch is accidentally closed
when the shield is removed.
To assemble standard consumable parts, refer to Figure
4-1.
A.
Place nozzle, swirl baffle, electrode, and valve
pin into the shield.
B.
Thread assembly to the torch body and hand
tighten. Always make sure the shield is tight
before cutting.
VALVE PIN
ELECTRODE
SWIRL BAFFLE
NOZZLE
SHIELD
Figure 4-1. Assembly of PT-27 Torch Front End Parts
MAINTENANCE
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