ESAB Powercut 650 Especificações descarregar pdf (Página 28)

Single-phase 208 or 230 VAC power enters the rectier block where it is rectied by the IBR and gated on

and o by an SCR. The rectied 325 VDC output (230VAC input) is coupled to the Bus Supply via L2 on

the negative side of the bridge, and is directly coupled to the IGBTs on the positive side.

L2 is an inductor that has 2 purposes. First to prevent the initial surge of current from damaging the

bridge rectier and second as a bus lter device, assisting in DC ripple reduction.

SCR (Silicon Controlled Rectier) is used as a series switch for the DC power during plasma operation.

The SCR is gated on by the PWM on PCB1 and is on when cutting and o when unit is at idle conditions.

During initial charging of the buss caps, power ows through the “precharge” resistor (R10), but when

cutting, R10 is bypassed by the SCR.

Testing: 500 K Ohm forward resistance, reverse resistance - high resistance (20 Meg ohm or greater) out

of circuit. In circuit resistance is 99 K Ohm.

SECTION 5 MACHINE TESTING / TROUBLESHOOTING / SERVICE

5.2 Input Bridge

IBR Testing

Mode Ω

Forward Resistance 500 K

Reverse Resistance

(out of circuit)

20 Meg+

Reverse Resistance

(in circuit)

99 K

208/230 Volt

460 Volt

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ESAB Powercut 650 Especificações Página 28