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THEORY OF OPERATION
E-2 E-2
COMPACT WIRE WELDERS
GENERAL DESCRIPTION
The Compact Wire Welders that are covered by this
manual are Constant Voltage (CV) DC welders that
can be used for MIG or Flux-Core process . The 120
VAC machines are rated for 90 amps, 19.5 volts, at
20% duty cycle. The 208 / 230 VAC machines are
rated for 130 amps, 17 / 20 volts, at a 30% duty
cycle. All are equipped with a 4-pin trigger connec-
tor to allow operation of an optional spool gun for
Aluminum MIG Welding.
FIGURE E.2 — GENERAL DESCRIPTION
TRIGGER
RECEPTACLE
WIRE
SPEED
CONTROL
ARC
VOLTAGE
CONTROL
CONTROL
BOARD
GAS
SOLENOID
WIRE
FEED
MOTOR
LINE
SWITCH
CIRCUIT
BREAKER
INPUT
RECEPTACLE
FAN
MOTOR
MAIN
TRANSFORMER
MAIN
BRIDGE
CHOKE
+
+
-
OUTPUT
TERMINALS
VOLTAGE FEEDBACK &
MOTOR POWER
NOTE: Unshaded areas of Block Logic
Diagram are the subject of discussion
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