Lincoln Electric 11694 Service Manual page 8

®
POWER WAVE S350
MAIN INPUT
SWITCH RECTIFIER
INPUT
POWER
FIRST & SECOND
STAGE SIGNALS
POWER PFC CONTROL
ON LED
BOARD
PRECHARGE
RELAY
CONTROL
Figure E.1 - Block logic diagram
INPUT HIGH FREQUENCY INVERTER
CHOKE WITH PLANER TRANSFORMER
INPUT
IGBT
RELAY
FULL WAVE
DC LINK FIRST STAGE
BRIDGE
CAPACITOR BUCK-BOOST
100 Ohm
CR
48
VDC
48/24 VDC
FAN
48
CONTROL
VDC
48
VDC
IGBT
DRIVES
40 VDC
REMOTE
USER INTERFACE
KIT
(OPTIONAL)
ARC LINK
COMMUNICATION
BUZZER
COMMUNICATION
ARC LINK REMOTE CONTROL AND TRIGGER COMMUNICATIONS
SWITCH BOARD
(SECOND STAGE)
OUTPUT
RECTIFIER
50Khz
OUTPUT
100V
400V
CAPACITORS
CURRENT
TRANSDUCER
CHOPPER
CONTROL
BOARD
48 VDC
FAN CONTROL
TO SWITCH
BOARD
40 VDC
DC BUS
BOARD
ARC LINK
COMMUNICATION
ARC LINK
RECEPTACLE
40 VDC
ERROR
2
THEORY OF OPERATION
+ POSITIVE
TERMINAL
(THIRD STAGE)
MULTI-PHASE BUCK
CONVERTER
CURRENT
TRANSDUCER
– NEGATIVE
TERMINAL
120 Khz
CURRENT VOLTAGE
FEEDBACK FEEDBACK
CHOPPER
COMMUNICATION
THERMOSTATS
CONTROL
BOARD
ETHERNET
SYNC-TANDEM
CONNECTOR
STATUS
"ERROR"
LIGHT
THERMO
LED
DEVICENET