POWERMASTER 500, 500P, 350, 350P
March 17, 2006
5-1
SECTION 5:
MAINTENANCE
The following checklist can be used as a guide for routine
maintenance.
• Check warning labels for readability.
• Check sheet metal panels, all screws and fasteners
should be firmly secured, heavily corroded panels
and fasteners or damaged panels should be replaced.
• Check primary input power wiring to the machine
including ground. Repair or replace any wires that
have cracked or damaged insulation or frayed
connections.
• Check output weld connections including any
connections to wire feeders, fixtures, etc. Loose or
frayed connections can cause overheating of the
output terminals, or excessive voltage drop which
may degrade welding performance.
• Check control cable connections to the power source
and wire feeder or other controls. Damaged cables
can cause intermittent problems which are often
difficult to troubleshoot. Cables should be repaired
or replaced if damage is evident.
• Check all control switches and potentiometers. If
any of the controls are damaged or broken they
should be replaced. Most of the controls on this
machine are integral components to a circuit board,
and will require replacement of the board.
• Inspect internal wiring of the welding machine for
loose or frayed connections, tighten or repair as
necessary.
• Check internal connections including circuit board
connectors. Any loose or corroded connections
should be repaired
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,
qualified person only. Any electrical work must be
performed by an electrician or other person properly
trained in servicing electrical equipment. Do not permit
untrained persons to inspect, clean or repair this
equipment. Use only recommended replacement parts
when servicing this machine.
WARNING
Danger: HIGH VOLTAGE is present internally
even with the control power switch in the OFF
position. Before inspecting, cleaning, or
servicing, disconnect and lock out the input
power to the power source.
Periodically clean the inside of the welding power source
by using clean dry compressed air of not over 25 psi as
normal preventive maintenance. At the time of the
cleaning, a full inspection of the welding machine and setup
should be performed.
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