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SP-100
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E-1
THEORY OF OPERATION
NOTE: Unshaded areas of block logic diagram are the subject of discussion.
INPUT LINE VOLTAGE, FAN
MOTOR AND MAIN
TRANSFORMER
The 115 vac input power is applied to the
SP-100 through a receptacle located on the
rear panel. The input power is connected to
the fan motor, control board and main
transformer through a line switch located on
the front panel. A circuit breaker is incorpo-
rated in the 115 vac circuit to protect the
unit from current overloads. The fan motor
employs a 24 vac auxiliary winding which
powers the control board. The main trans-
former changes the high voltage, low cur-
rent input power to a low voltage, high cur-
rent output for welding.
FIGURE E.1 – Input Power Circuits