The Power MIG 350MP is a complete semiautomatic,
multi-process DC arc welding machine offering CV and
CC DC welding. It is rated for 350 amps, 32 volts, at
60% duty cycle. The standard machine is equipped to
weld CC Stick, CC-GTAW, CV-FCAW, and synergic
and non-synergic CV GMAW/GMAW-P, Pulse-on-
Pulse, and Power Mode welding processes.

The digital microcomputer based control system allows
easy and accurate adjustment of weld parameters
through the multi-process panel located on the front of
the machine. The Power MIG 350MP is equipped with
a 6-pin connector for a foot amptrol or remotes and a 7-
pin connector to allow operation of a spool gun or a
push-pull gun for feeding aluminum wires.

THEORY OF OPERATION

E-2

POWER MIG 350MP

FIGURE E.2 – GENERAL DESCRIPTION

NOTE: Unshaded areas of Block Logic Diagram are the subject of discussion.

IGBT

LINE
SWITCH

RECONNECT
PANEL

MAIN
TRANSFORMER

RELAY

SPOOL
GUN
BOARD

FEEDER
BOARD

MSP
BOARD

ENCODER
BOARD

DISPLAY
BOARD

RS232
CONNECTOR

WELD CONTROL BOARD

SPOOL GUN
PUSH-PULL
SWITCH

WIRE DRIVE
MOTOR

OUTPUT
RECTIFIER

CHOPPER
ASSEMBLY

OUTPUT
CHOKE

CURRENT
TRANSDUCER

GUN

POS
OUTPUT
TERMINAL

NEG
OUTPUT
TERMINAL

POWER
BOARD

DIODE CONTROL
RECTIFIER

FAN
MOTOR

FOOT AMPTROL OR REMOTE (6-PIN AMPHENOL)

SPOOL GUN OR PUSH-PULL GUN (7-PIN AMPHENOL)

GAS
SOLENOID

SEC

THERMOSTATS

115
VAC

30
VAC

60
VAC

80
VAC

40 VDC

40
VDC

40 VDC

24 VDC

20 VDC

PWM
SIGNALS

+15/-15/+5 VDC

SHIELDED
CABLE

GUN TRIGGER AND THUMB SWITCH

SHIELDED CABLE AND SPI COMMUNICATIONS

ARCLINK
+5 VDC

CURRENT
FEEDBACK

VOLTAGE
FEEDBACK

FROM WELD
CONTROL BOARD

TO FAN RELAY

IGBT
DRIVE

T
A
C
H

CHOPPER

(Below code 10900)

Mechanical Encoders

(Above code 10900)

GAS
SOLENOID

115 VAC AUX.
RECEPTACLE

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