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10.1 - POWER SUPPLY UNIT FAILED
OPERATION FLOW SIGNAL
The welding machine is connected to the 230Vac 50/60Hz single-phase mains. When the input switch is closed, phase and neutral are
connected to the welding logic and filter board 15.14.243. A varistor is connected between phase and neutral, i.e. a device protecting the
downstream electronics against overvoltages. In case of an overvoltage which is too high or lasts for too long, the varistor explodes.
The single-phase supply is filtered for electromagnetic compatibility purposes and is fed to board 15.14.244 for the AC/DC conversion. In
fact, power board 15.14.244 contains the rectifier bridge which allows a DC voltage of +325Vdc to be obtained.
BLOCK DIAGRAM
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