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sectioN 6
6.1 TrouBlesHooTInG
elecTrIc sHocK can KIll! Be sure that all primary
power to the machine has been externally discon-
nected. 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 following
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 termi-
nal connections, loose or burned wiring or components,
bulged or leaking capacitors, or any other sign of damage
or discoloration.
6.2 TrouBlesHooTInG GuIDe
a.
Difficult starting.
•
Change electrode
•
Change nozzle
•
Check for good, clean connection of work lead to workpiece
•
Check air pressure 55 -65 psi (4 - 5 bar)
•
Check torch power cable for continuity
Depress torch switch. After 2 seconds, is high frequency present?
Is the "Air" LED light on
Yes
Repair/replace
power source
Yes
No
Repair/replace
control PCB
31
trouBleshootiNg
The cause of control malfunctions can be found by
referring to the sequence of operations and electri-
cal schematic diagram (figure 5-1) and checking
the various 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
covers are removed.
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
NOTE
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