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THEORY OF OPERATION
E-2E-2
POWER MIG 200
FIGURE E.2 – INPUT POWER CIRCUIT.
INPUT LINE VOLTAGE, MAIN
TRANSFORMER, VOLTAGE
SELECTOR SWITCH AND
BAFFLE MOUNTED DIODE
BRIDGE
The single phase input power is connected to
the POWER MIG 200 through a line switch
located on the front panel.
A reconnect panel allows the user to configure
the machine for the desired input voltage. The
AC input voltage is applied to the primary of the
main transformer. The cooling fan motor
(120VAC) is powered from a portion of the
primary winding. For welding purposes, the
main transformer converts the high voltage, low
current input power to a lower voltage, higher
current output. This tapped secondary winding
is coupled to a voltage selector switch. By
selecting one of seven positions on the switch
the user can preset the desired voltage output
from a minimum setting (A) to a maximum
voltage setting (G). In addition, the main
transformer houses a 28VAC winding. This
28VAC is rectified at the baffle mounted diode
bridge and the resultant DC voltage is used to
power the electronics on the control board, the
output contactor, and the gas solenoid.
NOTE: Unshaded areas of block logic diagrams are the subject of discussion.
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LINE
SWITCH
RECONNECT
PANEL
FAN
MOTOR
RECTIFIER
DIODE
BRIDGE
CONTROL BOARD
GAS
SOLENOID
WIRE
SPEED
CONTROL
WIRE
DRIVE
MOTOR
TACH
FEEDBACK
GUN TRIGGER
+
-
OUTPUT DIODE
BRIDGE
+
-
NEGATIVE
TERMINAL
CONTACTOR
CONTACTOR
CONTROL
TAP SELECTOR
SWITCH
OUTPUT
CHOKE
POSITIVE
TERMINAL
TRANSFORMER
THERMOSTAT
OUTPUT BRIDGE
THERMOSTAT
28 VAC
MAIN
TRANSFORMER
OUTPUT
CAPACITORS
GUN
ASSEMBLY