MAINTENANCE
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SAFETY PRECAUTIONS
WARNING
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. Have qualified personnel do the maintenance work.
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. Using the skid handles to hold the unit 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.
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Always use the greatest care when working near mov- ing parts.
If a problem cannot be corrected by following the instructions, take the machine to the nearest Lincoln Field Service Shop.
See additional warning information throughout this manual.
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 D.2.) 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 better than 2% accuracy.
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MAINTENANCE
The only maintenance that may be required for the
The recommended cleaning procedure is as follows:
1.Be sure to disconnect the Converter input cable to remove its input power.
2.Remove the four screws securing the rear louver panel and remove the panel to expose the cooling tunnel heatsinks. (See Figure D.1 below.)
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 trimmer (R562). Clockwise rotation of the trimmer adjustment 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 trimmer (R561). Clockwise rotation of the trimmer adjustment screw will decrease the meter reading. The “master” voltmeter should be connected as close as possible to the “ELECTRODE +” stud and “WORK
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