Main Circuit Card Z001 - Kemppi Fitweld 300 Service Manual

Main circuit card Z001

Functions and components:
- EMC filtering
- Primary rectifier and DC -link charging PTC
- H –bridge (frequency 27kHz)
- Gate transformers and gate drivers
- Auxiliary voltage 15VDC
- Over voltage sensing from DC-link
- Two stage fan start
- PTC protection alerts (signals comes from the main transformer and the
secondary choke)
15VDC aux. voltage
indicator LED
X28
X32
X26
X29
X25
X27
Current transformer
Primary rectifier
IGBT-module
EMC filtering
Jumpers, default settings:
X25 open
X26 closed,
- generator compensation off
X27 open
X28 closed
X29 closed
X32 open
Gate transformers
6