ANALOG CONTROL POWER
SUPPLY BOARD AND WELD
CONTROL BOARD
The Analog Power Supply PC board, which is powered
by 80 VDC derived from the filter capacitors on the
Power Modules, supplies various regulated DC volt-
ages to operate the Weld Control PC board circuitry. It
also supplies two regulated DC voltages to operate the
IGBT driver circuitry on the two Power Modules.
The Weld Control PC board monitors the operator con-
trols (arc control, output, and process/range selector).
It compares these commands to the current and volt-
age feedback information it receives from the shunt
and output terminal circuits. The circuitry on the Weld
Control PC board determines how the output should be
controlled to optimize welding results, and it sends the
correct PWM signals to the IGBT driver circuits. The
Weld Control PC board also commands the thermal
light and the voltmeter and ammeter (some items may
be optional).
E-4 E-4
THEORY OF OPERATION
COMMANDER 500
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NOTE: Unshaded areas of Block Logic Diagram are the subject of discussion.
