S0740 800 191/E080229/P78
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ct32_15
15 The power module
The power module converts 3--phase 400 V to the welding voltage. It consists of a single
forward inverter, operating at a switching frequency of 27 kHz.
The mains rectifier bridge 15BR1, the IGBT transistors 15Q1 and 15Q2 and the diode
modules 15D1 and 15D2 are all mounted on a heat sink. Circuit board 15AP1 links them
together. It also carries a smaller circuit board, 15AP2, which provides the functions for the
gate drivers and overvoltage and undervoltage protection.
Block diagram of the power module
If the IGBT transistors 15Q1 and 15Q2, or circuit boards 15AP1, 15AP2 or 20AP1, are
replaced, the gate pulse waveforms must be checked afterwards and the machine must be
soft--started. See page 60.
See the instructions on page 59 concerning mounting of the components on the heat sink
(15Q1, 15Q2, 15BR1, 15D1 and 15D2).
WARNING!
The power module is live at mains voltage.
0 V in the power module is connected to mains voltage.
Summary of Contents for Aristo Arc 4000i
Page 14: ...S0740 800 191 E080229 P78 Mig U4000i valid for serial number 803 xxx xxxx 14 cu19_00...
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Page 16: ...S0740 800 191 E080229 P78 Mig 4000i valid for serial number 803 xxx xxxx 16 cu19_00...
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Page 18: ...S0740 800 191 E080229 P78 Tig 4000i valid for serial number 803 xxx xxxx 18 cu19_00...
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Page 49: ...S0740 800 191 E080229 P78 49 cu19_20_2 20AP2 Circuit diagram...
