Tyco Electronics Galaxy SC Controller J85501F-1
2 - 4 Product Description Issue 13 February 2001
Circuit Packs
Used in the
Galaxy SC
Controller
The building blocks of the Galaxy SC system are its various circuit
packs, sometimes called circuit boards or cards. The circuit packs fit into
the Galaxy SC card slots as seen in Figure 2-1. Some of the circuit packs
are always required, and several are optional as needed by individual
users. Some of the circuit packs are part of the basic controller; some are
used in the intelligent controller, and the remaining circuit packs provide
common termination and communication functions.
Note: In general, circuit boards on the basic side of the controller may
be “hot inserted.” Circuit boards on the intelligent side of the controller
require that the Intelligent Controller Power Board (BJJ1 or BJJ2) be
unseated before installation.
BJA1 or BJA2
(Basic Controller
Power Board)
Always present; provides the power required by the basic controller, and
provides the hardware high voltage (HV) circuitry. BJA1 is for 48 volt
systems, BJA2 is for 24 volt systems.
BJB1 (Basic
Controller Digital
Board)
This circuit pack is always present in the controller. BJB1 contains the
microprocessor, memory, serial interface, chip select logic, and other
digital components used for the basic controller.
BJC1, BJC2 or
BJC3 (Rectifier
Interface Board)
At least one, and as many as three, of these circuit packs will always be
present in the controller. BJC1 provides the circuitry to interface with
Tyco Electronics rectifiers with VI signals for monitoring the rectifier
load). BJC2 provides the same functions for Tyco Electronics switch
mode rectifiers and non-Tyco rectifiers with mV shunt signals. The
Galaxy SC can control a total of up to 64 rectifiers. BJC3 (Serial
Rectifier Interface Board) provides the circuitry to interface with Galaxy
SC serial interface switchmode rectifiers and converters. The BJC3 can
control up to 64 serial rectifiers, up to 16 converters, and up to 32 bay
interface cards, up to a maximum of 75 nodes on the rectifier serial bus.
BJE3 (Relay/
Alarm/Display
Driver Board)
This circuit pack is always present in the Galaxy SC. It contains the
remaining circuitry required by the basic controller. The circuit pack has
isolation circuits to receive contact closures from other parts of the plant
such as external fuse alarms, TR leads, and external timer float and
boost leads. It also contains the alarm relays such as power major and
power minor. The circuit pack also contains the interface circuits to the
front panel display board (BJG1). BJE1 and BJE2 are older versions of
the board. If battery and load LVDs are used in a system without BICs,
then the BJE3 board should be used.
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