Digital Controller (IGBT-based Systems)

The EX2100e Excitation control products offer a Regulator control system in a 800 mm

(32 in) enclosure with supporting hardware based on the particular application. Other

packaging options are available. The Regulator system can be purchased as part of a

finished cabinet, or individual components can be shipped separately for onsite mounting

to better serve retrofit applications.

Power conversion consists of an input section, a dc link, and the converter output section.

The input section is a 3-phase diode bridge with input filters. The system accepts a

primary ac input range of 90 to 280 Vrms, nominal for the 35 A system, and up to 480 V

rms for the 120 A system. The ac input is 480 Hz (maximum), which can be supplied as

1-phase or 3-phase from a permanent magnet generator (PMG), auxiliary bus, or

generator terminals.

To process application software, two independent Universal Controller Stand-alone Board

Version B (UCSB) controllers, with separate PCMs and an output selector module (SCM

or TCM), provide the dc output current for the exciter field (or SCTcontrol winding).

The active power bridge receives the gating commands from the active control (M1 or

M2), and supports the full-field voltage and current needs of the exciter field while the

backup power bridge’s gating circuit is inhibited. The operator has full control to select

which of the dual power bridges is active or inactive. Bi-directional, bumpless transfer

between active and inactive bridges is standard. The active master can also self-diagnose

a failure or missed operation and activate the backup control and power bridge without

operator intervention.