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.
THEORY OF OPERATION
E-3 E-3
INVERTEC STT
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NOTE: Unshaded areas of Block Logic Diagram are the subject of discussion.
FIGURE E.3 – RECONNECT, PROTECTION BOARD, RECTIFICATION AND PRECHARGE
