Kemppi WeldForce KPS 3500 Service Manual page 6

Main circuit components
Rectifier unit
3500, 4500: 60 A/ 1600 V
5500: 100 A/ 1600 V
The primary rectifier VG101 rectifies the net voltage. The primary choke L001 limits the in-
rush current during switching and filters the DC-voltage together with the smoothing capacitors.
Smoothing capacitors
2 x 25 µ F/ 700 VDC
Work capacitors
3500: 18 x 0,15 µ F/ 1000 VDC
4500: 22 x 0,15 µ F/ 1000 VDC
TM
(KEMPPI WELDFORCE
Primary choke
IGBT-module
3500: 100 A/ 1200 V
4500: 150 A/ 1200 V
3500and 4500)
Rectifier unit
35 A/ 600 V
Varistor
550 V
RC-protection
Discharge resistors
RC-protection
6