Power Board_Pcb2 Torch Trigger Circuit (0558038315) - ESAB Powercut 1600 Service Manual

SECTION 4 DESCRIPTION Of OPERATION
4.10.15

Power Board_PCB2 Torch Trigger Circuit (0558038315)

The Torch Trigger circuit consists of a 24 VAC signal that is rectified and passed to an opto isolator. The
output of the opto isolator is then connected to the to the control board as the START signal.
24VAC is sent out on J12 pin 2 and routed to either the PT38 torch trigger or to a CNC. Once the torch
switch is closed, the 24VAC is returned on J9 pin 2 and sent to D3, a full wave bridge. This rectifies the AC
signal and sends DC power out to the opto-isolator U7 to fire it. Once the opto-isolator is fired, the output
of U7 pin 5 is then sent to the control board via J4 pin 17.
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