Lincoln Electric Welder K3425-1

Examine the sheet metal case for dents or breakage

Keep the case in good condition to insure that high voltage parts are protected and correct spacings are maintained

All external sheet metal screws must be in place to insure case strength and electrical ground continuity

Sign off on the welder routine maintenance

Clean interior of machine with a low pressure air stream

Make a thorough inspection of all components

Look for signs of overheating, broken leads or other obvious problems

Many problems can be uncovered with a good visual inspection

Upload a photo of the machine after inspection

Sign off on the visual inspection

Connect a resistive load bank to the machine configured for 300A/20V (750A/50V equivalent)

Connect a certified calibrated voltmeter to the output circuit. Use the M25303 low pass filter supplied with the K4171-1 Power Wave Calibration Kit between the meter and the power source

Disconnect input power from the machine being calibrated and remove the right case side to provide access to the User Interface

Rotate the Hot Start control and Arc Control knobs completely counter-clockwise

Replace the right case side; reconnect input power to the machine and energize. The display should read “Cur CAL”

Rotate the Arc Control knob until the display reads “VoL CAL”

Rotate the Hot Start knob clockwise to enable the output which will be indicated by the scrolling message “AdJ Pot So rEAL VoL = 20 VoL” on the display

Enter the actual output voltage

Adjust the output control knob until the actual output voltage reading is within the specified range (20 +/- 0.5 V)

Connect a resistive load bank to the machine configured for 300A/20V (750A/50V equivalent)

Connect a certified calibrated current probe or current meter and shunt to the output circuit

Disconnect input power from the machine being calibrated remove the right case side to provide access to the User Interface

Rotate the Hot Start control and Arc Control knobs completely counter-clockwise

Replace the right case side; reconnect input power to the machine and energize

The display should read “Cur CAL”

Rotate the Hot Start knob clockwise to enable the output which will be indicated by the scrolling message “AdJ Pot So rEAL Cur = 300 A” on the display

The actual output current should be 300 +/- 2 A

Adjust the output control knob until the actual output current reading is within the specified range

Warning: This cleaning procedure requires trained personnel with PPE!

Machine cleaned with a low pressure airstream?

Select all parts that have been cleaned

Machine operating cooler and with higher reliability after cleaning?

Sign off on the welder cleaning