Section TOC
Master TOC
THEORY OF OPERATION | ||
| FIGURE |
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1
2
3
FAN
LINE |
SWITCH |
3A |
AUXILIARY |
TRANSFORMER |
TO
WIREFEEDER
POWER SWITCH SECTIONS 20KHZ
LEFT SWITCH BOARD
FET MODULES
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| CAP |
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| FET MODULES | CURRENT | |
1ø OR 3ø DETETCTION (H5) |
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| TRANSFORMER | ||
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INPUT | DRIVER |
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RECTIFIER | BOARD |
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| CONTROL |
| CR1 |
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| BOARD | |
AC1 |
| PROTECTION | |||
PULSE |
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AC2 | BOARD |
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TRAIN |
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AC3 |
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CR2 |
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24VDC |
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| RIGHT SWITCH BOARD | |||
18VAC | 2ND STEP PWM |
| FET MODULES |
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| POWERBOARD |
| CAP |
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24VAC |
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| <1 VDC |
| FET MODULES |
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| LOCAL | METER | MODE | POT | POT |
| REMOTE | ||||
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| 1ST STEP PWM VOLTAGE |
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MAIN | CHOKE | RECTIFIER | |
TRANSFORMER | |||
HEATSINK | |||
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TOP |
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| 1 DIODE |
5 DIODES
BOTTOM
5 DIODES
TOP
1 DIODE
CHOKE
VOLTAGE FEEDBACK
CURRENT
CHOKE
SHUNT
TOC
TOC
PRECHARGE & PROTECTION CIRCUITS
The DC voltage from the Input Rectifier is applied to the Driver Board to begin charging the Switch Board capacitors at a slow rate. When the
The Driver Board is also responsible for gating the Field Effect Transistors (FETs) on the Switch Boards, as directed by the pulse width modulated (PWM) signal from the Control Board.
The Protection Board monitors the capacitors for prop- er balance and voltage level. If an imbalance or over- voltage condition is detected, the Protection Circuit will
Another function of the Protection Board is to detect whether the input voltage is single phase or three phase and pass that information to the Control Board. The maximum output of the machine will be limited to approximately 250 amps with single phase input and 360 amps with 3 phase input.
Return
Return
NOTE: Unshaded areas of block logic diagram are the subject of discussion
