IS200DSPXH1A GE EX2100, Digital Signal Processor Control Board

Description:

Functional Description
The IS200DSPXH1A is a Digital Signal Processor (DSP) Control Board developed by GE, designed for the EX2100 excitation system. As a crucial component of the EX2100 series, the DSPX board serves as the primary controller for various functions including bridge regulation, motor control, and gating within the Innovation Series drives. It also oversees generator field control operations within the EX2100 Excitation Control system. The board integrates logic, processing, and interface functionalities through its high-performance digital signal processor (DSP), standard memory components, and an application-specific integrated circuit (ASIC) that handles custom logic tasks. Specifically, it manages bridge regulator functions and can control generator field operations for the EX2100 series exciters. Its main role is to regulate the motor, bridge regulator, and gate functions in the Innovation Series drives. When linked with the Excitation Controller series, the DSPX board extends its control to include field control for generator applications.

IS200DSPXH1A Standard Hardware Features
The DSPX's Digital Signal Processor operates at a frequency of 60 MHz and handles four external interrupts during normal operation:

- Inner loop load pulse (INT1)
- Stack overflow (INT0)
- Two configurable inputs (INT2, INT3)

The DSPX board incorporates several types of memory:

- FLASH memory stores DSP boot images, code execution, configurable items, and system history records.
- RAM is utilized for data storage and code execution.
- NVRAM provides nonvolatile data storage.

Onboard Firmware
Firmware stored in flash memory includes three main components:

- The boot loader manages the power-on sequence and should not be reconfigured in the field.
- Application code defines specific control functions for the drive or exciter product. This code is loaded via the exciter's Tool port, while configuration parameters are inputted through the toolbox. The Unit Data Highway facilitates the loading of exciter parameters.
- If applicable, drive parameters are transmitted to ACL_ via serial port, ISBus, or Ethernet.

I/O Connections
The P1 connector offers memory-mapped process bus address space along with four chip select signals to support bridge and customer I/O interfaces. It also features controls for a standard UART serial interface to a programmer board and a configuration tool, plus two additional ISBus proprietary serial interfaces for ACL or local expansion functions.

The P5 emulator port, located on the board's front panel, connects to the TI emulator port. It includes a scan interface (similar to JTAG) for emulation and FLASH programming.

The P6 engineering monitor port, also on the front panel, links to the DSP's synchronous serial port (at TTL levels) and allows connection exclusively to a GE engineering terminal.

Board Replacement Procedure
Ensure the exciter is deactivated before proceeding.
Open the control cabinet door and verify that the power indicators on the EPDM (if equipped) and EPSM power supplies, as well as the DSPX LEDs, are off.
Disconnect the six fiber-optic cables from the EISB front panel.
Carefully remove the DSPX board along with its attached EISB board from the control rack as illustrated below:
- Loosen the screws near the ejector tabs located at the top of the DSPX faceplate and the bottom of the EISB faceplate. (Note that these screws in the faceplate are captive and should not be removed.)
- Lift the DSPX and EISB by pulling on the ejector tabs.
- Gently pull both boards out of the rack using both hands.
- Detach the EISB from the bottom of the DSPX and connect it to the replacement DSPX.
- Insert the new DSPX and EISB boards into the correct rack slot.
- Begin seating the board by pressing down firmly on both the top and bottom faceplates simultaneously with your thumbs.
- Complete the installation by tightening the screws at the top and bottom of the faceplate assembly alternately, ensuring an even pressure for a square fit.
- Reconnect all communication cables that were disconnected during the removal of the old module.

Software Overview
The exciter control code is executed by microprocessor-based controllers (ACLA and DSPX). The software comprises modules (blocks) working together to provide essential system functionalities. Variables are stored in random-access memory, while block definitions and configuration parameters reside in flash memory (RAM). Traditional analog controls are emulated by the exciter application software, utilizing an open architecture system with a library of pre-configured software blocks from the toolbox.
Individual blocks, such as logic gates, proportional integral (P.I.) regulators, function generators, and signal level detectors, perform specific tasks. The control switches between two modes: generator voltage regulation (Auto Regulation) and direct control (voltage or current, depending on the application). The control includes generator protection functions like over and under-excitation limiting, power system stabilization, and V/Hz limiting.
With the toolbox, blocks can be interrogated while the exciter is running. In operation, viewing the dynamically changing I/O values of each block is useful during startup or troubleshooting.
Power Conversion Cabinet
The Power Conversion cabinet contains the Power Conversion Module (PCM), the Exciter Gate Pulse Amplifier (EGPA) board, an alternating current circuit breaker, and a direct current circuit contactor. The PCM receives three-phase power from a PPT located outside the exciter.
The AC supply enters the cabinet through the AC circuit breaker (if provided) and is filtered by 3-phase line filters housed in the auxiliary cabinet.

Datasheet Link:

IS200DSPXH1A GE EX2100, Digital Signal Processor Control Board PDF Datasheet