ESAB Powercut 650 Especificações descarregar pdf (Página 57)

5.8.8 Current Control

SECTION 5 MACHINE TESTING / TROUBLESHOOTING / SERVICE

Current control on the Powercut 650 is controlled from the front panel. The variable resistor R1 mounted

on the front panel is connected to the positive 5-volt source of PCB1 on R1 pin 3 via P6-13 and to the 40A

branch of the PCB1 voltage divider on R1 pin 2 via P6-6. R1 pin 1 is connected to ground through the P6-

12 connection of the PCB1 control board.

The variable of R1 connected to P6-6 ows to pin 6 of the voltage comparator IC5 on the control board.

The output signal of the comparator modulates Q7, the output of which is connected to pin 6 of the

pulse width modulator chip. This has the eect of varying the duty cycle of the generated waveform and

thereby increasing or decreasing a given current level.

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ESAB Powercut 650 Especificações Página 57