ESAB MIGMATIC 250 - MAINTENANCE & INSPECTION; Regular Inspection; Cautions to Insulation Voltage Proof Test & Insulation Resistance Measurement Test

MAITENANCE & INSPECTION
The maintenance and inspection should be carried out only after the switches
in the switch box are certainly turned OFF.
Try to maintain and inspect the set regularly as per the following guidelines.
a) Regular Inspection
Every 3-6 months, depending on operation frequency:
Inspection Portion
Inspection Point
Maintenance Method
Fuse box
Fastening &
Looseness at the
Connection.
Confirmation of proper
fuse
Refer to Equipment
Capacity.
Input and Output
Connections
Fastening &
Looseness at the
Connection.
Confirmation of
Insulation
Fasten first and Tape
Electro-magnetic
Conductor
Confirmation of
Abrasion at Contact
Points
Replace with new ones.
Interior of Welding
Power Source
Sedimentation Of
Dust. Trace of
Overheat.
Blow off dust with
Compressed Air.
b) Cautions to Insulation Voltage – Proof Test & Insulation
Resistance Measurement Test:
Careless execution of Dielectric Strength test and Insulation
Resistance Measurement will cause damage to the Power Source
since diodes and other semiconductor parts are widely used in the
unit. When these are to be performed in accordance with the bylaws
of your company, the following points should be kept in mind :
• Remove input cable from main supply and short-circuit the three
input terminals.
• Take off the cable that is connected to two output terminals
and short-circuit the two output terminals.
• Short-circuit the diode block.
• Remove the three grounding conductors. (Take off the top cover,
the remove two grounding conductors – one near the control
transformer, another near the electromagnetic contractor. Take
off the right side panel, and remove the grounding conductor
near the leg of the main transformer).
• Disconnect the Wirefeeder from the Power Source.
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