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12. MAINTENANCE AND TROUBLESHOOTING
WARNING
Observe the following to prevent electric shock.
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Do not touch the live electrical parts inside or outside the welding power source.
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Turn off all of the line disconnect switches before touching the parts inside the welding
machine.
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Perform the maintenance checks periodically. If any damaged parts are found, only use the
welding machine after troubleshooting or repairing.
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Only certified operators should maintain, inspect, or repair the welding machine.
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When carrying out the maintenance, wait more than three minutes after powering off all input
power supply by turning off the line disconnect switch in the switch box. Capacitor may be
discharging even after powering off all input power supply. Check to make sure that
charging voltage does not exist before carrying out the maintenance.
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This welding power source uses a high-frequency inverter system, be careful of accidental
connection of the line disconnect switch at input side.
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Have qualified operators or the persons familiar with this welding power source test
withstand voltage. And install a protective wall around the welding machine to keep away
others from the welding machine.
CAUTION
Rotating parts may cause injuries. Be sure to observe the following.
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Only certified operators should maintain, inspect, or repair the welding machine.
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Install a fence around the welding machine to keep others away from it.
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Do not put your hands, fingers, hair and clothes near the fans and wire feed roll rotating.
CAUTION
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Do not touch the parts for the main circuit which are located inside the power
source, such as single-phase transformer, DC inductor, heat sink, etc. immediately
after welding is performed, as the parts are extremely hot. Wait until the parts cool
down, when touching. Failure to observe the demand may result in burn.
CAUTION
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The welding conditions (electronic data) stored using the JOB MEMORY keys are likely to be
affected by occurrence of static electricity, and there is a possibility that the preset data
contents may be changed or erased. We recommend taking notes of important data.
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We shall not assume any responsibility for any change or loss of the electronic data resulting
from repair.
CAUTION
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Do not use moisture-free compressed air for cleaning the fan. Dust may penetrate into fan
by compressed air pressure, or fan blades may be rotated at excessive rotation speed. It
causes an abnormal wear in the bearing and fan failure. Use soft cloth for removing dust.
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Do not vacuum the space between main body and rotating part. Otherwise the grease may
be vacuumed up and result in damage to fan.