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Power circuit reference

ZX7-500A 3-Phase 380V Power Path

Use this page to move from input power evidence to IGBT switching and output rectifier evidence on ZX7-500A 3-phase machines.

High-energy path

The high-energy path is not a single replaceable board. Treat input rectification, DC bus storage, IGBT inverter, main transformer, output diode modules and output reactor as separate evidence layers.

ZX7-500A high-level power path.
ZX7-500A high-level power path.
ZX7-500A DC bus, SKM100GB128D IGBT modules and MURP20040CT output rectifier modules.
ZX7-500A DC bus, SKM100GB128D IGBT modules and MURP20040CT output rectifier modules.

Power-path evidence table

SectionNormal evidenceFault clue
Input / rectifier board3-phase AC becomes DC bus voltageBreaker trip, missing bus, bridge short.
DC bus capacitorsstable DC link after rectifierripple, bulge, trip, slow discharge or bus imbalance.
IGBT invertergate-drive permission and switchingshorted IGBT, gate imbalance, snubber stress.
Output rectifierrectified secondary outputno OCV, weak current, shorted 20040 module.
Filter reactorsmooth loaded welding currentunstable current, harsh arc, weak loaded response.