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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
malfunction. 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-500i.
4.2 INSPECTION AND CLEANING
Frequent inspection and cleaning of the PCM-500i 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 or replace
if necessary.
E.
Make sure cable and hoses are not damaged or
kinked.
F.
Make sure all fittings and ground connections are
tight.
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-
500i.
H.
With all input power disconnected, and wearing
proper eye and face protection, blow out the inside
of the PCM-500i using low-pressure dry com-
pressed air.
4.3 FLOW SWITCH (FIGURE 4-1)
When excessive contamination is found in the air, the
flow switch (FS) should be removed, disassembled and
cleaned as follows:
A.
Ensure the system is shut down and there is no
trapped air under pressure in the piping.
B.
Remove the piston plug.
C.
Remove the spring (FS-4 only). Use care when
handling spring to prevent distortion.
D.
Remove the piston.
E.
Clean all parts with cleaning agent.
Ensure cleaning agent does not contain solvents
which can degrade polysulfone. Warm water and
detergent is recommended for cleaning. Allow all
parts to dry thoroughly before reassembly.
Reassemble the flow switch in reverse order.
SPRING
FLOW SWITCH
Figure 4-1. Disassembly / Assembly of Flow Switch
MAINTENANCE
NOTE
PISTON PLUG
PISTON
19
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