Control Board; Display Board - Lincoln Electric OPTIMARC CV500 Service Manual

SVM7007 THEORY OF OPERATION D‐4
SINGLE‐PHASE RECTIFIER
Two single-phase rectifier bridges are respectively connected to two 36VAC voltage output of the Auxiliary
Transformer. The single-phase rectifier bridge rectifies the 36VAC voltage into pulsating DC voltage and
supplies it to the Control Board (82/83) and the Switchboard (33/34).
CONTROL BOARD
The Control Board receives parameter adjustment and function selection signals from the front panel and
wire feeder, and communicates with the Switchboard through CAN bus. These signals are processed and
transmitted to the Switchboard to control the welding output. The Control Board also drives the Feeding
Motor and the Gas solenoid, and provides signals to the Display Board.
SETTING CIRCUIT
The given circuit provides the given signal for the Control Board according to the parameters set by the
operator. It is composed of potentiometers and function selection switches on the panel of the power source
and the wire feeder, including: current & voltage potentiometer, gas purge button and wire feed button on
wire feeder, crater current & crater voltage potentiometer, arc control potentiometer, gas selection switch,
wire selection switch, 2/4 step selection switch & mode selection switch on front panel of power source.
DISPLAY BOARD
Receive the signals come from the Control Board and display preset/output parameters and status of the
machine. The Control Board provide DC15V power supply to the Display Board.
FIGURE D.3
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OPTIMARC CV/CC500