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Chapter 3 Printed Wiring Boards Overview GEH-6632 EX2100 User’s Guide
Control Boards
The control boards are located in the control module. This module consists of the
exciter backplane (EBKP) and the metal chassis that holds the boards (refer to Figure
3-1). The control boards are as follows:
• IS200DSPX Digital Signal Processor control board (DSPX)
• IS215ACLA Application Control Layer Module (ACLA)
• IS200EISB Exciter ISBus Board (EISB)
• IS200EMIO Exciter Main I/O board (EMIO)
• IS200ESEL Exciter Selector board (ESEL)
EBKP Backplane
The EBKP provides the backplane for the control boards and the connectors for the
I/O terminal board cables. EBKP has three sections for controllers M1, M2, and C.
Each section has its own independent power supply. Controllers M1 and M2 have
the ACLA, DSPX, EISB, EMIO, and ESEL boards. Section C only has the DSPX,
EISB, and EMIO. Two overhead fans cool the controllers.
The upper part of the backplane contains DIN connectors for the plug-in control
boards. The lower part of the backplane contains D-SUB connectors for I/O interface
cables, and circular DIN connectors for keypad interface cables, power supply plugs,
and test rings. Labels on the connectors in Figure 3-1 refer to the boards and devices
to which the cables are connected. For more information refer to Chapter 4 and GEI-
100460.
DSPX Board
The DSPX performs most of
the I/O interface and inner
loop bridge control and
protection functions
The DSPX board is the main controller and shares control responsibility with the
ACLA. It is a single-slot, 3U high module located in the control rack next to the
ACLA. It provides functions including the bridge firing circuit control, I/O
processing, and inner loop regulation as follows:
• Field Voltage Regulator (FVR)
• Field Current Regulator (FCR)
• SCR gating signals to the ESEL board
• Start-stop function
• Field flashing control
• Alarms and trip logic
• Generator instrumentation processing
• Generator simulator
For more information refer to Chapter 4 and GEI-100267.