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THEORY OF OPERATION
FIGURE E.4 – ANALOG POWER BOARD AND CONTROL BOARD
WORK
TERMINAL
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RECTIFIER |
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TO
CONTROL
BOARD
D W
L I
EN
WD
I
N
G
+ | ELECTRODE | |
IGBT | TERMINAL | |
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CHOKE | SHUNT | + |
4 | POWER MODULE |
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0 |
| F | |||||
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TO |
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| E | |
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| E | |
1 | 2 | FROM |
| S | D | ||
0 | P | I | |||||
0 | TOROID | B | |||||
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| G | |||||
0 |
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| CURRENT | W | A | ||
| V | N | |||||
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| SENSOR | M | C | |||
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| D | A | ||||
V |
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| K | |||
| C |
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| L | |||
D |
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C | S |
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STARTER
GAS
ENGINE MECHANICAL ROTATION
FLYWHEEL
ALTERNATOR
OIL
PRESSURE
SWITCH
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| ANALOG | CONTROL |
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| POWER | |
| ROTOR | BOARD | ||
| BOARD | |||
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SLIP |
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RINGS |
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| REGULATED VOLTAGES |
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| ARC OUTPUT MODE |
| STATOR |
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| CONTROL CONTROL SELECTOR |
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FIELD | AUXILIARY | WIRE FEED |
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WINDING | WINDINGS | PWR WNDG |
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BATTERY
SOL
I
D
L
4 | 4 | |
2 | ||
2 | ||
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V | V | |
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RUN/STOPE
SWITCH
R
TO CONTROL
BOARD
BATTERY
BOARD
A | 2 | 1 | A | |
C | ||||
C | 4 | 2 | ||
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| 0 | 0 |
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| V | V | AMPHENOL | |
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AA
CC
240VAC 120VAC
RECEPTACLE RECEPTACLE
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ANALOG POWER BOARD AND CONTROL BOARD
The analog power board, which is powered by the two filter capacitors on the power module, supplies various regulated DC voltages to operate the control board cir- cuitry. It also supplies a regulated DC voltage to oper- ate the chopper board.
The control board monitors the operator controls (arc
control, output, and mode selector). It compares these commands to the current and voltage feedback infor- mation it receives from the shunt and output terminal circuits. The circuitry on the control board determines how the output should be controlled to optimize weld- ing results, and it sends the correct PWM signals to the IGBT driver circuit.
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NOTE: Unshaded areas of Block Logic Diagram are the subject of discussion.