Kemppi MasterTig LT 250 Operating Manual

Also see for MasterTig LT 250: Quick guide

Contents

EN5. ERROR CODESThe machine always checks its operation automatically during start-up and reports any failuresdetected. If failures are detected during start-up, they are shown as error codes on the controlpanel display.Error 4: Power source overheatingThe 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 themachine.Other error codes:The machine can show codes not listed here. In the event of an unlisted code appearing, contactan authorised Kemppi service agent and report the error code shown.5.1 TroubleshootingProblem CausePanel display does not light. • Check parent power supply is functioning• Check parent power supply is connected• Check parent power supply cable connectors are correct and secure.Poor welding results. Several factors affect the welding quality.• Ensure that the parent power source is set to full power and that the voltage exceedsthe minimum supply voltage level of 40 volts. (Inadequate supply voltage will resultin an unstable power delivery or poor ignition).• Ensure that the welding current selected is adequate for the selected electrode typeand 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 andclamp 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 preparedtungsten electrode. Always maintain and grind a point on the TIG torch electrode tipbefore welding.Overheating indicator is illuminated. Normally, this indicates that the device has reached its maximum designed operatingtemperature. The thermostat has become active, switching the welding power off.Allow the unit to cool and the machine will soon automatically reset and allowwelding 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.If the machine’s malfunction is not eliminated with the above measures, contact Kemppi service.13© Kemppi Oy / 1422