THEORY OF OPERATION
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INPUT VOLTAGE AND PRECHARGE
The Power Wave 455M can be connected for a variety of
The two phases that are connected to the Input Board, through the input line switch SW1, are connected to the input rectifier through the CR1 precharge relay. During
the precharge or "soft start" sequence, these two phas- es are current limited by the Input Board. The AC input voltage is rectified, and the resultant DC voltage is applied through the reconnect switches to the input capacitors located on the right and left switch boards. The Control Board monitors the voltage across the capacitors. When the capacitors have charged to an acceptable level, the Control Board signals the Input Board to energize the main input contactor, making all three phases of input power, without current limiting, available to the input capacitors. At this point the Power Wave 455M is in the "Run Mode" of operation. If the capacitors become undervoltaged, overvoltaged, or unbalanced, the Control Board will signal the Input Board to
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