TROUBLESHOOTING
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© ESAB AB 2020
No power test
Fault tracing Description Solution / Remedies
Measurement 1 Start up trip
Step 1
Using a multimeter set to diode test setting, test the
primary rectifier bridge +, - terminal.
The voltage drop is 0.6-0.8 V.
Test the primary rectifier bridge ~ to +, the voltage drop
is between 0.3-0.4 V.
If it is significantly lower than the above value, the
primary rectifier bridge is defect.
Step 2:
Using a multimeter set to diode test setting, measure
the voltage at GE, CE on the IGBT.
If the voltage is 0 V, the IGBT is defect. Replace the
complete inverter PCB.
Restoring the power source after pre power up checks
NOTE!
After having completed all pre-power up checks, restore the power source carefully to
its original position.
Power up checks
After having performed pre power up checks according to the instructions in the previous
pages and restored the power source you can perform power up check as follows:
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