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THEORY OF OPERATION
FIGURE E.3 – RECONNECT, PROTECTION BOARD, RECTIFICATION AND PRECHARGE
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S | FET | B | |
W | O | ||
I | CAP | A | |
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LINE |
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SWITCH |
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TRANS |
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TRANS |
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RPWM SIGNAL
M
O
S15VDC
T
A |
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T | GUN TRIGGER | CONTROL BOARD |
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36VAC
TAILOUT | PEAK | BACK- | PEAK | HOT | BACK- | WIRE | |
CURRENT | GROUND | SIZE | |||||
CONTROL | CURRENT | START | GROUND | ||||
(STT II ONLY) | METER | METER | CONTROL CONTROL CONTROL | SWITCH | |||
CURRENT
TRANS
T3
WIRE
TYPE
SWITCH
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MAIN | 1 OHM |
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TRANSFORMER |
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T2 |
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CURRENT | IGBT | NEGATIVE |
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SENSOR | MODULE | OUTPUT |
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CHOKE |
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| VOLTAGE |
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| RECEPTACLE | |
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| E | P | O | RECEPTACLE |
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| FEEDER |
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| RECEPTACLE |
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CURRENT FEEDBACK
IGBT
DRIVER
BOARD
VOLTAGE FEEDBACK
10VAC AND 6VAC
42VAC
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RECONNECT, PROTECTION
BOARD, RECTIFICATION AND
PRECHARGE
The reconnect panel allows the user to switch to low or high input voltage to match the input line voltage. The AC input voltage is rectified and applied to the driver board. The driver board contains precharging circuitry for safe charging of the input filter capacitors. Once the capacitors are precharged, the input relays are ener- gized, connecting full input power to the input filter capacitors. The protection board monitors the capaci- tors for voltage balance and/or overvoltage and will de- energize the input relays and precharge circuitry if either occurs. The machine output will be disabled.
NOTE: Unshaded areas of Block Logic Diagram are the subject of discussion.
