Technical Overview

The IS200VSVOH1BDC functions as a high-precision Servo Control (VSVO) module within the General Electric Mark VI and Mark VIe Speedtronic ecosystems. Engineered specifically for heavy-duty steam and gas turbine actuation, this card manages the critical interface between the controller and hydraulic servo valves. It excels in Triple Modular Redundancy (TMR) environments, utilizing "median select" voting across multiple feedback loops to eliminate single points of failure. By integrating bi-directional current drivers with support for LVDT, LVDR, and high-frequency pulse rate inputs, the IS200VSVOH1BDC ensures nanosecond-level response times for turbine fuel and steam regulation.

Detailed Technical Specifications

The following parameters define the operational boundaries and hardware capabilities of the IS200VSVOH1BDC (Revision BDC):

• Manufacturer: GE Industrial Systems (General Electric US)

• Module Type: Servo Control Card (VSVO)

• Control Loop Configuration: Supports 2-coil or 3-coil servos (3-coil required for TMR safety)

• Servo Channels: 4 independent channels per board

• Feedback Sensors: Up to 3 LVDT/LVDR sensors per channel

• Excitation Source: Integrated AC excitation for position feedback sensors

• Pulse Rate Input Range: 2 Hz to 14 kHz (optimized for liquid fuel flow dividers)

• Speed Sensor Compatibility: Dual-mode support for both Active and Passive sensors

• Input Sensitivity: Sufficient range starting at 2 Hz

• Output Drive: Bi-directional current outputs for versatile valve positioning

• Diagnostics: Triple-LED array providing real-time status (Run, Fail, and Status)

• Logic Selection: Software-configurable Median, High, or Low select voting

Operational Capabilities and Logic

The IS200VSVOH1BDC is characterized by its sophisticated feedback management. In flow divider applications, the 2–14 kHz pulse rate input allows the servo loop to maintain exact fuel volume control, compensating for mechanical variances in real-time. When paired with a Backup Protection Module, the card extends its monitoring capacity to support two additional passive speed sensors, reinforcing overspeed protection layers.