Tweco 500P PowerMaster - Manual (Page 43)

POWERMASTER 500, 500P, 350
Manual No. 0-4749 5-1 SERVICE
SECTION 5:
SERVICE
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. Check warning labels on the machine for
readability; replace if necessary. Check input and output
connections as well as frame ground connections to the
machine to insure that they are tight and the wires are not
frayed or overheated. Inspect internal wiring of machine
for loose or frayed connections; tighten or repair as
necessary. It would also be advisable to check connections
to wire feeders, fixtures, etc., at this time. Any damaged
cables or hoses should be replaced.
5.01 General Maintenance
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 per-
formed 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.
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 input power to the
power source.