－
67
－
12. MAINTENANCE AND TROUBLESHOOTING
(Continued)
12.3 Insulation Resistance Test and Withstanding Voltage Test
WARNING
To avoid electric shocks, observe the following precautions.
Insulation and withstanding voltage test shall be carried out by personnel who have
knowledge and skills for the safety operation, and barriers, etc. shall be set up around the
welding power source to forbid the access of unnecessary people. Confirm that the
capacitance has discharged completely before the operation.
Perform the insulation and withstanding voltage test as follows.
Refer to the Electric Connection Chart, Parts Configuration Chart and List of Parts for overhaul.
1) Remove all ground wires for the housing (wire number 80).
2) Pull out the plug-in CN4 on P30110R.
3) Short-circuit the AC side and rectifier side of DR1.
4) Short-circuit TR1 (3)-(1), (1)-(2), TR2 (3)-(1), (1)-(2)) one by one.
5) Short-circuit the positive and negative charges of diode DR2–DR4.
6) Short-circuit all input terminals and output terminals.
7) Close
NF
(ON).
Restore all wiring after completion of the test.
12.4 How to Solve an Error
WARNING
Observe the following to prevent electrical shock.
When touching charging parts, critical electric shock and burn may occur.
●
Do not touch live electrical parts inside or outside the welding machine.
●
Grounding to the case of the welding power source should be performed by persons
qualified electric work and according to the laws and regulations in your area.
●
When touching the parts inside the welding power source, wait more than three minutes
after powering off all input power supply by turning off the line disconnect switch in the
switch box.
If an error occurs during use, an error code shown in the displays on the front panel blinks, then the
welding power source stops automatically. In this case, check the errors in the following table.
Wminfo
