GENERAL DESCRIPTION
The PRO-CUT 80 is a constant current, continuous
control plasma cutting power source. The inverter
based power supply design is controlled by a micro-
processor control board. The control system has a
safety mechanism to insure that the nozzle and elec-
trode are in place before cutting or gouging. The PRO-
CUT 80 initiates the plasma arc with a simple, yet reli-
able, touch start mechanism. This system eliminates
many of the problems associated with hi-frequency
type start systems. When powered up, the machine
performes some rudimentary self diognostics.
INPUT LINE VOLTAGE, SWITCH
AND MAIN TRANSFORMER
The single-phase or three-phase input power is con-
nected to the machine, via an input line cord, to a
switch located on the front panel.
A reconnect panel and voltage range switch allow the
user to configure the machine for either a low or high
input voltage and also connect the auxiliary trans-
former for the appropriate input voltage.
The auxiliary transformer develops the appropriate AC
voltages to operate the cooling fan, the control board
and the plasma output board.
THEORY OF OPERATION
E-2 E-2
PRO-CUT 80
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FIGURE E.2 – INPUT LINE VOLTAGE
NOTE: Unshaded areas of Block Logic Diagram are the subject of discussion.
