531X133PRUALG1 | General Electric PROCESS INTERFACE BOARD

As a backup, the system accepts a secondary power input from a dc battery bank (125 to 250 V dc nominal). The dc secondary input is diode-isolated and combined with the 3-phase diode bridge output. These sources energize the dc link, which is an unregulated source voltage for the control output power through the IGBTs. The dynamic discharge (DD) circuit limits the dc link voltage level during events such as load rejection or unit trip.The converter output section uses IGBTs to pulse-width modulate the dc link source voltage to its final value. The chopping frequency of the IGBTs is approximately 1,000 Hz. This output is fed to the exciter field as a regulated voltage or current. An output shunt monitors the field current. Continuous dc output is provided up to 100% rating with temporary forcing capabilities up to 210%. Regulated output flows through a dc contactor to the exciter field. The EX2100e Regulator system contains interface boards that are interconnected through a high-speed serial link (HSSL) and cabled to their associated I/O terminal boards