Lincoln Electric RED-D-ARC DC-400 Operator's Manual page 37

F-4
221 X
D1
SCR1
Gate leads
P3
plug to control
P.C. board
DIAGRAMS
POWER RECTIFIER BRIDGE
DIAGRAM 1
PLUG TO SNUBBER BOARD
222
1
D2
SCR2
G1 G2
P5
220
223
204
X
2
ANODE D3
CATHODE
ANODE
SCR3
GATE
CATHODE
G3
DC-400
220
_
X
3
To (+) side
of capacitor
bank
D4
SHUNT
_
+
204
204
To
mode
204
switch
204
To plug
P1
To T1 main
transformer
F-4
+