Theory Of Operation; General Description; Input Voltage - Lincoln Electric INVERTEC POWER WAVE 450 SVM112-B Service Manual

E-2
THREE
PHASE
INPUT
POWER
INPUT
LINE
SWITCH
PROTECTION
BOARD

GENERAL DESCRIPTION

The Power Wave is an inverter type power source that
can support most welding procedures. It is modeled
after a P.C. (Personal Computer). There are no specif-
ic welding characteristics designed into the power
portion of the machine. All welding characteristics are
programmed into the software package.
NOTE: Unshaded areas of Block Logic Diagram are the subject of discussion.

THEORY OF OPERATION

FIGURE E.2 – INPUT VOLTAGE CIRCUIT
INPUT
RECTIFIER
INPUT AND
CONTACTOR RECONNECT
LEFT
SWITCH
BOARD
FET
ASSEMBLY
AUX.
TRANS
RIGHT
SWITCH
BOARD
FAN
FET
ASSEMBLY
POWER
BOARD
WATER
COOLER
PC
INTERFACE
POWER WAVE 450
MAIN OUTPUT
TRAMSFORMER
RECTIFIER
CT
SNUBBER
SENSE
CONTROL
BOARD
LCD
DISPLAY
DISPLAY
BOARD
KEYPAD
OVERLAY
WF1 WF2

INPUT VOLTAGE

The Power Wave can be connected for a variety of
three phase voltages. The initial input power is applied
to the Power Wave through a line switch located on
the front of the machine. The voltage is connected to
the Protection Board where it is current limited before
being passed on to the input rectifier and reconnect
switches. The reconnect panel allows the user to
switch to low or high voltage and connect the Auxiliary
Transformer to the appropriate input voltage.
Auxiliary Transformer supplies power to the fan motors
and, through the Protection Board, to the printed cir-
cuit boards and wire feeder(s).
E-2
CHOKE POSITIVE
NEGATIVE
SHUNT
AND
LEADS
The