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THEORY OF OPERATION
FIGURE E.7 – OUTPUT RECTIFIER, OUTPUT CHOKE AND STT CHOPPER BOARD
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| IGBT DRIVE | MAIN |
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| FROM | CT CURRENT |
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POWER WAVE 455/R |
| CONTROL | TO CONTROL | TRANSFORMER |
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| BOARD | BOARD |
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| OUTPUT DIODES |
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| ELECTRODE | |||||
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| D1 |
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| TERMINAL |
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| CAP. V/F |
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| FEEDBACK | LEFT |
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| CR1 |
| INPUT |
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| SWITCH |
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| BOARD |
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| +20 VDC FROM |
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| RECTIFIER |
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| POWER BOARD |
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| CURRENT | STT | |
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| RECONNECT | IGBT DRIVE |
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| ELECTRODE | ||
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| STT CHOPPER | TRANSDUCER | ||||||
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| TERMINAL | ||||||
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| SWITCH | CT CURRENT |
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| BOARD |
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| CONTROL |
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| TO CONTROL |
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| BOARD |
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| BOARD |
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| SW1 |
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| RIGHT |
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| STT |
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| SWITCH |
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| CURRENT |
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| CAP. V/F |
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| DRIVE |
| WORK | ||||
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| FEEDBACK |
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| TRANSDUCER |
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| BOARD |
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| OUTPUT TERMINAL | ||||||
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| CHOKE | |
| INPUT |
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| 67A |
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| S1 |
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| BOARD |
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| VOLT |
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| C |
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| 67B |
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| U |
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| SENSE |
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| S6 | VOLTAGE SENSE |
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| R | S |
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| CONTACTOR AND PRECHARGE | BOARD | OUTPUT |
| DEVICE NET | TO | TO | R | T |
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| CONTROL SIGNALS FROM |
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| E | T |
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| CONTROL BOARD |
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| S5 | LEFT | RIGHT | N |
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| VOLTAGE SENSE SELECT |
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| GATEWAY | CONNECTION | S.B. | S.B. | T | F |
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| 2 | FROM CONTROL |
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| ARC LINK | BOARD | TO |
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| F | B |
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| ROBOT |
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| 4 | BOARD |
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| FEED | 40 VDC |
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| B |
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| V |
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AUX | A |
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| 40 VDC | HEAD |
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| IGBT |
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| TO FAN RELAY |
RECONNECT |
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C |
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| 115 VAC |
| BOARD |
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| DRIVES |
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| CONTACTOR AND | ||||
| RELAY |
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| FAN |
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| ARC LINK |
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| PRECHARGE | |||
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| 115 VAC |
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| CONTROL SIGNALS |
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| +5V RS232 |
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| THERMOSTATS |
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| CONTROL |
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| 52 VAC |
| 65 VDC |
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| CONNECTION |
| +5 V ARC LINK |
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| S6 |
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| BOARD |
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| BUS BOARD | DC | TO WIRE | POWER | +5V SPI |
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| DRIVE |
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| T1 |
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| RECTIFIER | BUS |
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| BOARD | +15V SPI |
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| SENSE |
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| BOARD | 40 VDC |
| +5 V |
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| S3 | |
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| +15 V |
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| RS232 |
| 230 VAC |
| WATER |
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| 40 VDC |
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| LEFT S.B. | |||||
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| COOLER |
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| CAP. V/F |
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| 40 VDC |
| +20 VDC |
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| CAP. V/F | ||||
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| TO |
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| ARC LINK |
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| 115 VAC |
| CHOPPER |
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| RECP. |
| S1 | WIRE |
| BOARD |
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| 115 VAC |
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| LEFT CT | RIGHT CT |
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| FEEDER |
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| T2 |
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| CURRENT | CURRENT |
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| RECP. |
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| FB | FB | STATUS | THERMAL |
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| LIGHT | LIGHT |
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OUTPUT RECTIFIER, OUTPUT
CHOKE AND STT CHOPPER
BOARD
Return
Return
The output rectifier receives the AC output from the main transformer secondary and rectifies it to a DC voltage level. The output choke is in series with the negative leg of the output rectifier and also in series with the welding load. Due to the current "smoothing" capability of the output choke, a filtered DC output cur- rent is applied through machine output terminals to the welding arc.
The STT Chopper Board is in series with the STT out- put terminal and is used to interrupt the welding cur- rent for very short periods of time during the
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