THEORY OF OPERATION
E-4 E-4
RANGER 250
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ANALOG POWER BOARD AND
CONTROL BOARD
The analog power board, which is powered by the two
filter capacitors on the power module, supplies various
regulated DC voltages to operate the control board cir-
cuitry. It also supplies a regulated DC voltage to oper-
ate the chopper board.
The control board monitors the operator controls (arc
control, output, and mode selector). It compares these
commands to the current and voltage feedback infor-
mation it receives from the shunt and output terminal
circuits. The circuitry on the control board determines
how the output should be controlled to optimize weld-
ing results, and it sends the correct PWM signals to the
IGBT driver circuit.
NOTE: Unshaded areas of Block Logic Diagram are the subject of discussion.
FIGURE E.4 – ANALOG POWER BOARD AND CONTROL BOARD
