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TROUBLESHOOTING & REPAIR
FOR REPLACEMENT OF SWITCH ASSEMBLY
WARNING
Service and repair should be performed by only Lincoln Electric factory trained personnel. Unauthorized repairs performed on this equipment may result in danger to the technician or machine operator and will invalidate your factory warranty. For your safety and to avoid elec- trical shock, please observe all safety notes and precautions detailed throughout this manual.
If for any reason you do not understand the test procedures or are unable to perform the test/repairs safely, contact the Lincoln Electric Service Department for electrical trou- bleshooting assistance before you proceed. Call
DESCRIPTION
The following tests and procedures must be performed if the main power FET module has been replaced in the Power Wave. These tests are necessary to ensure that the FET module has been installed and connected properly.
This procedure takes approximately 2 hours to perform.
BEWARE:
ISOLATED POWER SUPPLIES AND METERING MUST BE USED: CATASTROPHIC PC BOARD DAMAGE WILL OCCUR IF THE VOLTAGE SUPPLIES AND METERING ARE NOT COMPLETELY ELECTRICALLY ISOLATED.
MATERIALS NEEDED
Calibration and Test Overlay | |
Isolation transformer (for oscilloscope) |
|
Isolation transformer 115vac @ 3 amps (min) | circuit of figure #1 |
Isolation transformer 115vac @ 2 amps (min) | circuit of figure #3 |
Variable transformer 3 amps (min) |
|
Oscilloscope |
|
*Current probe | Tektronic P6201 |
| or equivalent |
Voltmeters |
|
Fuse 5 amps (2). |
|
P70 adapter |
|
Female connector | |
Male connector | |
Male pin | |
Female pin | |
P23 adapter |
|
Male connector | |
Female pin | |
Toggle switch (SPST) |
|
*An alternate method of testing using an isolated oscilloscope may be used.
