ESAB Powercut 650 Especificações descarregar pdf (Página 51)

SECTION 5 MACHINE TESTING / TROUBLESHOOTING / SERVICE

5.8.2 PCB Torch Switch

The switch on the torch closes the circuit requesting a cutting operation sending 12 VAC across rectier

bridge BR1 on the PCB control board. This 12 VAC signal originates from the PCB control transformer T2,

but it is routed through the torch. The torch closes the circuit that completes the 12VAC circuit on the

PCB module on Plug 5, pins 1 and 2 (P5-1 and P5-2). Capacitors C1, 2, 3 are installed for HF noise protec-

tion of the circuit. The rectied voltage from BR1 is fed across lter capacitor C4, LED1 lights up (which

indicates a START circuit condition) and then to a pair of opto isolator ICs. IC1 sends a “torch request on”

signal to the control chip IC2 pin6. This enables the logic circuit on IC2. IC9 sends a signal to the AND

gate IC10 in the Current Control circuit.

CONTENTS

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ESAB Powercut 650 Especificações Página 51