Kemppi WeldForce KPS 3500 Service Manual page 8

Main circuit components
X
Diode cards
The main transformer T001 secondary voltages are full-wave rectified by the diode cards. The
secondary voltage waves are dampened by secondary choke L002. The secondary circuit current
is measured by a shunt resistor. The shunt´s voltage is amplified by shunt amplifier A001/2 and
taken to control card A001´s PWM-adjuster.
From auxiliary transformer T002 secondary voltages are formed the supply voltages for A001
and control cable connection´s auxiliary units.
X
OCV smoothing circuit
No 220 V coil!
Control card A001
power supply 2 x 20 VAC
Secondary choke and shunt resistor
Shunt amplifier
Control cable connection power supply
+ 50 VDC
8