Kemppi Mastertig MLS 3003 ACDC Service Manual page 15

Secondary inverter Z003
Functions and main components
Z003 secondary inverter main functions
- acts as a four level switch matrix (DC+, DC-, Aux+, Aux-) (heat sink, X5, X7, X9)
- heat sink act as a conductor for positive terminal
- minus side IGBTs are insulated from heat sink by mica insulator
- gate drive circuits
- protection against gate drive under voltage
- optical isolation between control card gate drives
Grey igbts must be insulated
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