The PEC80-CCI (Converter Control Interface) module—designated as PCD231 (part number 3BHE025541R0101)—is a component of the UNITROL 6000 excitation system. As a high-speed power interface board within the AC800PEC high-speed power electronics control platform, it serves as both a high-speed interface and a pulse control unit linking the excitation master controller to the power rectifier bridge. It is widely used in UNITROL 6000 static excitation cabinets for gas and steam turbine generators and supports a 1:1 hot-standby redundancy architecture. The module acquires three-phase synchronous voltages from the generator terminals to achieve phase synchronization and outputs six channels of isolated thyristor trigger pulses. By precisely controlling the firing angles of the thyristors in the three-phase rectifier bridge, it regulates the excitation output voltage and current. The high-precision firing angle control meets the rapid response requirements for forced excitation, normal voltage regulation, and inverter-mode field suppression.
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