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EXCITER FEEDBACK, CONTROL
BOARD, LOCAL AND REMOTE
CONTROL
The exciter voltage is monitored and fed back through
the exciter voltage feedback board to the control board.
In the event the exciter voltage increases or decreases
to an unacceptable level, the engine protection circuit
shuts off the engine.
The control board compares the commands of the cur-
rent/mode selector and the fine output control (or
remote control) with the output voltage and current
feedback and sends the appropriate SCR gate firing
signals to the SCR/Diode bridge.
The Commander 400 is controlled by a high quality
microcontroller, which is the main circuit element of the
control board.
The control board also supplies operating voltages and
control signals to the CV board, the meter board, and
the engine protection board.
The remote control and contactor signals are fed to the
control board through the amphenols and the by-pass
board.
THEORY OF OPERATION
E-3 E-3
COMMANDER 400
NOTE: Unshaded areas of Block Logic Diagram are the subject of discussion.
FIGURE E.3 – EXCITER FEEDBACK, CONTROL BOARD, LOCAL AND REMOTE CONTROL
