15 The Power Module - ESAB Aristo Mig 3001i Service Manual

15 The power module

The power module converts the rectified 3-phase 400 V to the welding voltage. It consists of
a dual forward inverter, operating at a switching frequency of 2 x 40 kHz.
The mains rectifier bridge 2BR1, the IGBT modules IC3 and IC8 and the diode modules
15D1 and 15D2 are all mounted on a heat sink.
Schematic diagram of the power module
If circuit boards 15AP1 or 20AP1, are replaced, the gate pulse waveforms must be checked
afterwards and the machine must be soft-started. See page 50.
See the instructions on Page 54 concerning mounting of the components on the heat sink
(2BR1, 15AP1 with IC3 and IC8, 15D1 and 15D2).
WARNING!
The power module is at mains voltage.
0 V in the power module is connected to mains voltage.
S0740 800 196/E101019/P76
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