D-1
MAINTENANCE
D-1
3. Holding the unit by the front handles, so the
back is facing down, shake the loose debris out
of the unit. Raking out the heatsink fins may be
necessary for jammed debris.
4. If necessary, remove the case wraparound cover
and using the skid handles to hold upside down
carefully dump out any remaining loose debris,
or carefully blow out using low pressure air.
5. Reassemble the cleaned out Converter by
reversing the above steps.
DIGITAL METER CALIBRATION
If calibration of either digital meter is ever necessary,
meter calibration adjustment trimmers are provided on
the Weld Control PC board inside the Control Module
(see Figure 5). Calibration must be done with an
Output current load, so meters are displaying Actual
(not Preset) values. It is recommended that the cali-
bration levels be near the rating plate values, for best
accuracy, and compared to "master" meters with bet-
ter than 2% accuracy.
The accuracy of Actual
AMPS
meter should be within
3% of the welding amps monitored. The
AMPS
meter
trimmer (R561) is located near the center of the Weld
Control PC board just below the
VOLTS
meter trim-
mer (R562). Clockwise rotation of the trimmer adjust-
ment screw will decrease the meter reading.
The accuracy of Actual
VOLTS
meter should be within
3% of the welding volts monitored. The
VOLTS
meter
trimmer (R562) is located near the center of the Weld
Control PC board just above the
AMPS
meter trim-
mer (R561). Clockwise rotation of the trimmer adjust-
ment screw will decrease the meter reading. The
"master" voltmeter should be connected as close as
possible to the "
ELE
" stud and "
WORK-
"
lead bolt, for best accuracy.
MULTI-WELD 350
SAFETY PRECAUTIONS
Have qualified personnel do the maintenance
work.
Always use the greatest care when working near
moving parts.
If a problem cannot be corrected by following the
instructions, take the machine to the nearest
Lincoln Field Service Shop.
-----------------------------------------------------------------------
ELECTRIC SHOCK can kill.
• Do not touch electrically live parts or
electrode with skin or wet clothing.
• Insulate yourself from work and
ground
• Always wear dry insulating gloves.
------------------------------------------------------------------------
WARNING
MAINTENANCE
The only maintenance which may be required for the
Multi-Weld 350 is to clean out any accumulated dirt
and debris which could contaminate internal compo-
nents, or obstruct proper cooling of the power compo-
nents resulting in premature over-temperature shut-
down.
The recommended cleaning procedure is as follows:
1. Be sure to disconnect the Converterʼs input
cable to remove its input power.
2. Remove the four screws securing the rear louver
panel, and remove the panel to expose the cool-
ing tunnel heatsinks. (See Figure 4 below):
Figure 4
