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THEORY OF OPERATION
E-4 E-4
POWER WAVE 450
SWITCH BOARDS
There are four Switch Boards in the Power Wave, each
containing an input capacitor. The capacitors on
Switch Boards #1 and #2 are always in parallel, and
the capacitors on Switch Boards #3 and #4 are always
in parallel. When the filter capacitors are fully charged,
they act as power supplies for the Switch Boards. The
Switch Boards contain the Field Effect Transistors
(FETs) which, when switched on, supply the Main
Transformer primary windings with DC current flow.
See FET operation discussion and diagrams (Figures
E.10 and E11).
FIGURE E.4 – SWITCH BOARD CIRCUIT
NOTE: Unshaded areas of Block Logic Diagram are the subject of discussion.
CONTROL
BOARD
DISPLAY
BOARD
PROTECTION
BOARD
AUX.
TRANS
POWER
BOARD
CT
CONTACTOR
INPUT
INPUT
RECTIFIER
AND
RECONNECT
SWITCH
BOARD
FET
ASSEMBLY
SWITCH
BOARD
FET
ASSEMBLY
MAIN
TRAMSFORMER
OUTPUT
RECTIFIER
SHUNT
CHOKE POSITIVE
NEGATIVE
SNUBBER AND
LEADS
SENSE
LCD
DISPLAY
KEYPAD
OVERLAY
WATER
COOLER
PC
INTERFACE
INPUT
LINE
SWITCH
FAN
WF1 WF2
THREE
PHASE
INPUT
POWER
LEFT
RIGHT