GE Industrial Solutions Galaxy Verification - Manual (Page 98)

Galaxy Power System Verification Procedures
5 - 6 Glossary Issue 3 January 2008
SCF Controller Boards (Basic)
BJA1 or BJA2
Basic Controller
Power Board This board provides the power required by the basic controller. BJA1 is
for 48-volt systems, BJA2 is for 24-volt systems.
BJB1 Basic
Controller Digital
Board The BJB1contains the microprocessor, memory, serial interface, and
other digital and analog components used for the basic controller.
BJC3 Serial
Rectifier Interface
Board BJC3 provides the circuitry to interface with Galaxy serial interface
switchmode rectifiers and converters. The BJC3 can control up to
twenty-four serial rectifiers and 8 converters.
BJE2 Relay/Alarm/
Display Driver
Board Contains the remaining support circuitry required by the basic
controller. Has isolation circuits that receive contact closures from other
parts of the plant such as external fuse alarms, TR leads, and external
timer float and boost leads. Also contains the alarm output relays such
as power major and power minor. Provides the interface circuits to the
front panel display board (BJG1). Also contains Form-C contacts that
may be used for external contactor control.
BJF3 or BJF4
Termination Fuse
Board Contains the input power terminal blocks and fuses for the controller.
BJF3 is for negative voltage plants; BJF4 is for positive voltage plants.
BLG1 Front
Access Board Mounts above the rest of the circuit packs internal to the chassis.
Provides front access connections to all the customer’s alarm wiring and
signaling inputs.
BJG1 Display
Board Mounted inside the front door. Contains the switches, LEDs, and the
eight-line display control for the front panel, providing the primary user
interface for the controller. The display is protected by a lexan cover to
protect against high levels of electrostatic discharge (ESD).