OTC Welbee M350 II, Owner'S Manual

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This chapter explains the daily and periodical inspection of the welding power source.
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This section explains the precautions for maintenance and inspection work.
To prevent electric shock or burn injury, ensure to follow the instructions below:
To prevent being caught/pinched by the rotating parts, ensure to follow the instructions below:
‡
Do not touch the input and output terminals and the internal live electrical parts of the
welding power source.
‡ Perform periodical maintenance and repair damaged parts if any before use.
‡
Maintenance, inspection and repair should be performed by qualified persons or
persons familiar with the Welding power source.
‡ Before starting maintenance and inspection, make sure to cut the input power with the
disconnect switch in the box connected with the welding power source and wait three
minutes or more.
The capacitors may be still charged even after the input power is cut. Make sure that
there is no charged voltage before starting the work.
‡ During maintenance and inspection, take an appropriate measure to prevent turning on
the input power.
Special attention is necessary because the welding power source contains many parts
connected to the input side due to its high-frequency inverter method.
‡ Periodically blow the parts of welding power source with dry compressed air to remove
dust.
Powder dust accumulating inside may cause insulation deterioration, resulting in
electric shock or fire.
CAUTION
‡ Before maintenance and inspection, wait until the temperature inside the welding
power source becomes low.
The main circuit parts such as DC reactor and heat sink are hot just after welding.
Touching them accidentally may cause burn injury.
‡ Removing the cases for maintenance, inspection or repair should be performed by
qualified persons or persons familiar with the Welding power source. Also put up a
barrier around the Welding power source or take other necessary measure to prevent
other people from getting in the nearby area.
‡ Keep your hands, fingers, hairs and clothes away from the rotating cooling fan and the
open parts around the cooling fan;