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The GE IS200DSVOH2BDB Simplex DIN-Rail Servo Terminal Board (DSVO) is a specialized Printed Circuit Board (PCB) used in the GE Speedtronic Mark VI Turbine Control System.1
It serves as a compact, non-redundant (Simplex) field-wiring interface for electro-hydraulic servo mechanisms, which are critical for controlling the position of turbine valves.
🧠 Core Functionality
The DSVO board’s main role is to provide the reliable electrical connection and signal conditioning between the field devices (servo valves and LVDT sensors) and the Mark VI’s control processing unit, specifically the VSVO VME Servo Control Board.2
- Servo Control Interface: It provides connections for two servo valve outputs.3 These are used to drive the coils of electro-hydraulic servo valves for high-precision valve actuation (e.g., fuel or steam valves).
- Position Feedback: It accommodates inputs from up to six LVDT (Linear Variable Differential Transformer) position sensors for accurate, real-time feedback on the valve’s physical position.4
- Rate Inputs: It includes two active pulse rate inputs, typically used for flow measurement or speed signals.5
🛠️ Technical Design and Features
The IS200DSVOH2BDB is part of a series of terminal boards designed for industrial control cabinets.
| Feature | Details |
| System | GE Mark VI Speedtronic Turbine Control System |
| Type | Simplex (Non-redundant) Servo Terminal Board |
| Mounting | Designed for DIN-rail mounting, allowing for vertical stacking to optimize cabinet space. |
| Field Connections | Uses high-density Euro-Block terminal blocks for connecting field wiring. |
| I/O Processor | Connects to the VSVO (VME Servo Control Board) via two cables (a 37-pin and a 15-pin). |
| Current Selection | Servo coil currents are typically jumper-selectable (e.g., from 10 mA up to 120 mA). |
| Revision | The H2DBD suffix indicates a specific hardware and firmware revision, representing a functional update of the base IS200DSVOH2B model. |
| Certification | The H2B base model is often certified to UL-1604 Class 1, Division 2 standards, making it suitable for certain hazardous locations. |
The terminal board is essential for simplifying field wiring and providing necessary signal filtering and isolation from the control processor.
