8-5
Maintenance and Inspection
Chapter 8
8.4 Periodical Replacement Parts
This section explains the parts to be replaced periodically.
•
Printed circuit board PCB7 (
The printed circuit board PCB7 inside the welding power source has a high voltage electrolysis capacitor.
The high voltage electrolysis capacitor supplies stable direct current to the inverter circuit, but its
performance will degrade year by year.
If the printed circuit board PCB7 is used for an extended period without being replaced, it may result in
performance degradation of the welding power source and damage of the high voltage electrolysis
capacitor or other parts.
It is recommended to replace the printed circuit board PCB7 every five years.
For replacement of the printed circuit board PCB7, contact your dealer.
•
Others
Fan, relay, and rated power supply has a certain lifetime; they are recommended to be replaced once in
approximately five years.
When replacement of fan, relay, and rated power supply is necessary, please contact your dealer.
8.5 Insulation Resistance Measurement and Withstand
Voltage Test
If insulation resistance measurement and withstand voltage test is necessary, please contact your dealer.
•
When measuring insulation resistance and testing withstand voltage, follow the steps below.
Refer to the schematic diagram, parts layout, and parts list for maintenance.
–
Disconnect the input power cable and grounding cable from the disconnect switch and short-circuit
the input terminal.
–
Short-circuit the positive (+) and the negative ( - ) sides of the output terminal.
–
Unground all the case grounding cables (line No.80) and insulate them with insulation tape.
• Even if the part is replaced by the user, please contact your dealer.
• When inserting the connector to the printed circuit board, check that the number
printed on the printed circuit board is the same as the number indicated on the
connector, and insert firmly to the end.
• Do not turn on the power switch of welding power source when the connector of printed
circuit board is disconnected.
• The customer MUST NOT perform the withstand voltage test. If withstand voltage test
is necessary, ensure to contact your dealer.
• Insulation resistance measurement should be conducted by qualified persons or
persons familiar with the welding machine. Also, fence and other neccessary measures
should be taken around the welding machine to prevent other people from getting in
the nearby area.
• Conducting insulation resistance measurement by customer may result in injury or
equipment failure. For insulation resistance measurement, be sure to ask your dealer.
