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Description
Product Overview
Product Name: Analog Output Board / Servo Control Card
Model Number: DS3800HROA
Manufacturer: GE Energy (General Electric)
System Compatibility: Mark IV Turbine Control System (Speedtronic)
The GE DS3800HROA is a critical analog output interface board designed for the Mark IV (MKIV) gas/steam turbine management system. This system is renowned for its reliability in controlling and protecting large industrial turbines used in power generation and mechanical drive applications.
The primary function of the DS3800HROA board is to convert digital control signals from the MKIV’s central processors into precise, high-fidelity analog output signals. These signals are typically used to command and position hydraulic servos and actuators that control critical turbine functions, such as fuel valve position, inlet guide vane (IGV) angle, and bleed valve operation.
Key Features
- High-Precision Conversion: Features high-resolution Digital-to-Analog Converters (DACs) to ensure accurate analog output signals for precise control of turbine actuators.
- Multiple Output Channels: The board provides several independent analog output channels, allowing it to control multiple actuators simultaneously.
- Redundancy Support: The Mark IV system is designed with triple modular redundancy (TMR). The DS3800HROA is a key component within one of these redundant channels (R, S, or T).
- Built-in Diagnostics: Includes circuitry for self-test and diagnostic functions, which are reported back to the main processor to ensure system integrity.
- Robust Design: Built to withstand the harsh electrical and environmental conditions of a power plant environment, including resistance to vibration, temperature fluctuations, and electrical noise.
- Direct Servo Drive Capability: The outputs are designed to interface directly with or provide the command signal for the servo valve driver cards.
DS3800HMPJ1A1D
Technical Specifications
The following table details the technical parameters for the DS3800HROA board.
| Parameter | Specification |
|---|---|
| Board ID | DS3800HROA |
| Function | Analog Output / Servo Control Card |
| Compatible System | GE Mark IV (MKIV) Speedtronic Turbine Control |
| I/O Type | Analog Output (AO) |
| Number of Channels | Typically 8 channels (Confirm with manual) |
| Output Signal Range | Likely 0 to +10 V DC or 4-20 mA (jumper selectable per channel) |
| Resolution | High-resolution (e.g., 12-bit or 16-bit) DAC |
| Connector | Plugs into a dedicated slot on the Mark IV termination panel (e.g., using a DS3800HROA1 termination board). |
| Communication | Receives digital commands from the central processor via a proprietary backplane bus. |
| Power Supply | Receives power from the Mark IV rack’s power supply through the backplane (typically +5 V DC and ±15 V DC). |
| LED Indicators | Status LEDs for power, communication, and channel activity/faults. |
Typical Applications
The DS3800HROA is exclusively used within the GE Mark IV turbine control system for:
- Fuel Control: Providing the analog signal to control the fuel valve servo, regulating the amount of gas or liquid fuel entering the turbine.
- Inlet Guide Vane (IGV) Control: Positioning IGVs to optimize airflow and efficiency across the turbine’s operating range.
- Compressor Bleed Valve Control: Operating bleed valves to prevent compressor surge during startup and shutdown.
- Bypass Valve Control: Managing steam bypass valves in combined cycle applications.
- Any other application requiring a highly reliable analog control signal to a hydraulic actuator or positioner on a GE heavy-duty turbine.
Important Notes & Compatibility
- System Component: This board is not a standalone device. It is an integral part of the triple-redundant Mark IV system and cannot operate independently.
- Termination Panel: It requires a corresponding termination board (e.g., DS3800HROA1) to which field wiring from the actuators is connected. The main card plugs into this termination board.
- Configuration: Output ranges (voltage or current) are often configured via physical jumpers or switches on the board itself.
- Firmware: The board’s operation is dependent on the overall system firmware and configuration stored in the Mark IV’s main processors.
- Obsolescence: The Mark IV system is a legacy platform. While still widely used and supported by third-party specialists, parts like the DS3800HROA are often sourced from the aftermarket.
- Safety Warning: Turbine control systems are critical for safety and equipment protection. Only qualified personnel with specific training on GE Speedtronic systems should handle, install, or troubleshoot this component. Incorrect handling can lead to catastrophic turbine failure or personal injury.
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