EXCEL-ARC 500, 6045
August 22, 2005
5-1
SECTION 5:
SERVICE
5.01 Replacing SCRs
Replacing an SCR is a critical task but it can be
accomplished in the field by following the instructions in
the Detailed Troubleshooting section of the
Troubleshooting chapter of this manual.
5.02 Lubrication
The fan motor incorporates a sleeve bearing and therefore
will need periodic lubrication. The following table will
furnish a recommended guide to the frequency of this
lubrication.
Type of Duty
Lubrication
Interval
Light (up to 6 hrs./day) Every 12 months
Moderate (7 to 15
hrs./day)
Every 6 months
Heavy (16 to 24
hrs./day)
Every 3 months
Table 5-1: Lubrication
NOTE
Apply 1-12 drops of 20W non-detergent oil at
each end of bearing.
5.03 Inspection and Cleaning
For uninterrupted, satisfactory service from this welding
machine, it is necessary to keep the machine clean, dry,
and well ventilated. At least every three months, or more
often as necessary, wipe and blow out all dirt from the
machine’s internal components, with air pressure of not
over 25 psi (172 kPa). Be sure to wipe the fan blades
clean.
Check and tighten all electrical connections as necessary
to eliminate unnecessary losses and to avoid subsequent
trouble from overheating or open circuits. Check for
broken wiring or damaged insulation on wiring.
CAUTION
The flow of air through the welding machine
is carefully directed by baffles. Never operate
the welding machine with any of the side or
top panels removed or open, as serious
damage to the rectifiers might result.
