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SECTION 5
5.1 TROUBLESHOOTING
ELECTRIC SHOCK CAN KILL! Be sure that all pri-
mary power to the machine has been externally
disconnected. Open the line (wall) disconnect switch
or circuit breaker before attempting inspection or
work inside of the power source.
Check the problem against the symptoms in the follow-
ing troubleshooting guide. The remedy may be quite
simple. If the cause cannot be quickly located, shut off
the input power, open up the unit, and perform a simple
visual inspection of all the components and wiring.
Check for secure terminal connections, loose or burned
wiring or components, bulged or leaking capacitors, or
any other sign of damage or discoloration.
5.2 TROUBLESHOOTING GUIDE
A.
Difficult Starting.
• Change electrode
• Change nozzle
• Check for good, clean connection of work lead to workpiece
• Check air pressure (65-75 psig; 4.4-5.1 bar)
• Check torch power cable for continuity
Depress torch switch. After 2 seconds, is there a pilot arc?
16
Yes
Repair power
source
TROUBLESHOOTING
The cause of control malfunctions can be found by
referring to the sequence of operations and electrical
schematic diagram (Figure 5-1) and checking the vari-
ous components. A volt-ohmmeter will be necessary for
some of these checks.
Voltages in plasma cutting equipment are high
enough to cause serious injury or possibly death. Be
particularly careful around equipment when the cov-
ers are removed.
NOTE
Before checking voltages in the circuit, disconnect the
power from the high frequency generator to avoid dam-
aging your voltmeter.
No
Repair/replace
high frequency
unit
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