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The GE IS200DSVOH1ABA Servo Terminal Board (DSVO) is a specialized Printed Circuit Board (PCB) designed for use 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.2
⚙️ Core Function and Application
The primary function of the DSVO board is to connect and condition the signals between the turbine’s field devices and the main Mark VI control system’s I/O processing board (the VSVO VME Servo Control Board).3
This interface is critical for controlling the position of turbine valves (such as steam, fuel, or inlet guide vanes) with high precision and speed.4
- Servo Control: It provides the connection points and signal conditioning for two servo valve outputs.5 These outputs are used to drive the coils of electro-hydraulic servo valves, which in turn move the turbine’s control valves.
- Position Feedback: It accommodates inputs from Linear Variable Differential Transformers (LVDTs) or similar sensors, typically supporting up to six LVDT position sensors.6 This feedback is essential for the control system to accurately determine the actual position of the valve being controlled.
- Signal Interface: The terminal board handles the wiring of the servo coil current signals, LVDT excitation, LVDT position feedback, and pulse rate inputs.
🛠️ Technical Design and Features
The IS200DSVOH1ABA is a Simplex (non-redundant) terminal board designed for efficient installation:7
| Feature | Details |
| System | GE Mark VI Speedtronic Turbine Control System |
| Type | Simplex DIN-rail Mounted Servo Terminal Board |
| Mounting | Designed for mounting on a DIN-rail within the control cabinet, utilizing Euro-Block terminal blocks for field wiring. |
| I/O Processor | Connects to the VSVO (VME Servo Control Board) via dedicated cables (typically a 37-pin cable). |
| Configurability | Features jumpers or other customizable hardware for selecting servo coil currents (commonly from 10 mA up to 120 mA). |
| Revisions | The suffix H1ABA indicates the specific hardware and artwork revision. This revision is a functional update of the base IS200DSVOH1A model. |
| Protection | The PCB is typically protected by a conformal coating to shield it from moisture and contaminants in industrial environments. |
In summary, the DSVO board simplifies the wiring and provides the necessary filtering and isolation between the sensitive control electronics and the power components and sensors of the servo actuation system.
