Error Codes; Troubleshooting - Kemppi MasterTig LT 250 Operating Manual

5.

ERROR CODES

The machine always checks its operation automatically during start-up and reports any failures
detected. If failures are detected during start-up, they are shown as error codes on the control
panel display.
Error 4: Power source overheating
The power source has overheated. The cause may be one of the following:
• The power source has been used for a long time at maximum power.
• The circulation of cooling air to the power source is blocked.
• The cooling system has experienced a failure.
Remove any obstacle to air circulation, and wait until the power source fan has cooled down the
machine.
Other error codes:
The machine can show codes not listed here. In the event of an unlisted code appearing, contact
an authorised Kemppi service agent and report the error code shown.
5.1

Troubleshooting

Problem
Panel display does not light.
Poor welding results.
Overheating indicator is illuminated. Normally, this indicates that the device has reached its maximum designed operating
If the machine's malfunction is not eliminated with the above measures, contact Kemppi service.
© Kemppi Oy / 1422
Cause
• Check parent power supply is functioning
• Check parent power supply is connected
• Check parent power supply cable connectors are correct and secure.
Several factors affect the welding quality.
• Ensure that the parent power source is set to full power and that the voltage exceeds
the minimum supply voltage level of 40 volts. (Inadequate supply voltage will result
in an unstable power delivery or poor ignition).
• Ensure that the welding current selected is adequate for the selected electrode type
and size.
• Ensure the cable connections are correct and secure.
• Ensure the process selection is correct.
• Check that the earth return clamp connection area is clean and that the cable and
clamp are not damaged.
• For TIG welding, check that the shielding gas flow is switched on and set correctly.
Poor ignition and arc quality in TIG welding may be a result of a poorly prepared
tungsten electrode. Always maintain and grind a point on the TIG torch electrode tip
before welding.
temperature. The thermostat has become active, switching the welding power off.
Allow the unit to cool and the machine will soon automatically reset and allow
welding to re-start.
• Ensure that cooling air has unrestricted flow.
• If the machine's duty cycle has been exceeded, wait for indicator to turn off.
In certain circumstances, this light may also indicate irregularity in the supply voltage.
Too low or high supply voltage.
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