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Section |
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| - THEORY OF OPERATION SECTION - |
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Theory of Operation |
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| Section E |
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General Description |
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Input Voltage and Precharge |
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Switch Boards and Main Transformer |
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DC Bus Board, Power Board, Feed Head Board, Gateway Board |
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and Voltage Sense Board | ........................................................................................................... |
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Control Board |
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Output Rectifier, Output Choke and STT Chopper Board | .......................................................... |
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Thermal Protection, Protective Circuits, Over Current Protection |
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and Under/Over Voltage Protection |
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General Description of STT (Surface Tension Transfer) Process |
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Insulated Gate Bipolar Transistor (IGBT) Operation |
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Pulse Width Modulation |
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| FIGURE E.1 – BLOCK LOGIC DIAGRAM |
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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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| FROM | CT CURRENT |
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| SWITCH |
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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 |
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| DEVICE NET | TO | TO | R | T |
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| CONTROL SIGNALS FROM |
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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 |
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| ROBOT |
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| 4 | BOARD |
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| B |
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| FEED | 40 VDC |
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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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| 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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| +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 |
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| +5 V |
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| 230 VAC |
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| +15 V |
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| RS232 |
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| WATER |
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| 40 VDC |
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| COOLER |
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| CAP. V/F |
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| 40 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 |
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| CHOPPER |
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| RECP. |
| S1 | WIRE |
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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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