Output Control, Rectification & Voltage Feedback - Lincoln Electric 11937 Service Manual

E-4
FIGURE E.4 - OUTPUT CONTROL, RECTIFICATION & VOLTAGE FEEDBACK
CIRCUIT
INPUT
BREAKER
RECEPTACLE
LINE
SWITCH
OUTPUT CONTROL,
RECTIFICATION & VOLTAGE
FEEDBACK
The AC output from the main transformer secondary
windings is proportional to the selection of the voltage
control switch.
This AC output from the main transformer secondary
is rectified and this rectified DC voltage is filtered by
the output capacitor and choke circuit and is applied
to the machine's output terminals.
THEORY OF OPERATION
FAN GAS
MOTOR SOLENOID
CONTROL
TRIGGER
BOARD
RECEPTACLE
VOLTAGE
CONTROL
SWITCH
MAIN
TRANSFORMER
NOTE: Unshaded areas of Block Logic
Diagram are the subject of discussion
WIRE FEEDER WELDER (180 MODEL)
NOT FOUND
IN 125A MACHINE
WIRE
SPEED
CONTROL
WIRE FEED
MOTOR
WIRE DRIVE MOTOR &
SOLENOID VOLTAGE
NOT FOUND
IN 125A MACHINE
RECTIFIER
+
RESISTOR AND
CAPACITOR
E-4
–
OUTPUT
TERMINALS
+
OUTPUT
CHOKE