Lincoln Electric IM697 RED-D-ARC MX 300 - Manual (Page 19)

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 "ELECTRODE +" stud and "WORK-"
lead bolt, for best accuracy.
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
RED-D-ARC MX350 is to clean out any accumulated
dirt and debris which could contaminate internal com-
ponents, or obstruct proper cooling of the power com-
ponents 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
Figure 4
RED-D-ARC MX350