IS200DSVOH2B GE

Technical Specifications

Advantages and Key Features

High Channel Density: The IS200DSVOH2B provides 16 output channels in a single 6U VME board, effectively doubling the capacity of the IS200DSVOH1A family and reducing rack space requirements.

Enhanced Power Regulation: The “B” revision of this board incorporates upgraded voltage regulator modules, providing cleaner ±15V rails to the DACs and reducing output ripple for improved actuator stability.

Complete Channel Isolation: Each of the 16 channels on the IS200DSVOH2B is galvanically isolated from other channels and from the VME backplane at 1500V RMS, ensuring reliable operation in high-EMI generator environments.

Individual Channel Diagnostics: Features per-channel open-circuit and short-circuit detection with fault reporting to the main DSP processor, enabling rapid identification of field wiring issues.

Redundancy-Ready: The IS200DSVOH2B supports dual-board redundant configurations with automatic failover for mission-critical actuator control paths.

Versatile Output Ranges: Software-configurable bipolar (±10V) and unipolar (0–10V) modes allow the IS200DSVOH2B to accommodate a wide variety of actuator types from a single board.

Application Fields and Case Studies

The IS200DSVOH2B is used in large combined-cycle plants requiring control of multiple fuel valves, steam admission valves, extraction valves, and IGV actuators simultaneously. It is also deployed in multi-turbine installations where one Mark VI rack must serve multiple gas turbine or steam turbine control functions. In a Middle Eastern 900 MW combined-cycle facility, a single IS200DSVOH2B was used to control 16 separate actuators across two gas turbines and one steam turbine, eliminating the need for three separate IS200DSVOH1A boards. The IS200DSVOH2B simplified system architecture, reduced rack slot usage, and lowered overall system power consumption. When a channel on the IS200DSVOH2B encountered an intermittent short circuit due to a field cable fault, the board’s diagnostics allowed operators to identify the exact offending actuator within minutes.

Comparison with Competing Products

The IS200DSVOH2B offers the same high-resolution, fully isolated performance as the IS200DSVOH1A but with double the channel capacity and lower per-channel power consumption. While Siemens and ABB offer 16-channel alternatives, the IS200DSVOH2B provides superior isolation (1500V vs 500V) and comprehensive individual channel diagnostics, making it more suitable for critical turbine actuator applications.

Selection Recommendations

Choose the IS200DSVOH2B when your Mark VI system requires more than 8 analog voltage output channels, reducing rack space and cost per channel compared to multiple IS200DSVOH1A boards. Use it for complex combined-cycle plants where gas turbine fuel valves, steam admission valves, and auxiliary actuators must be controlled from a single board. Deploy redundant IS200DSVOH2B boards for applications with 8 or more critical channels to ensure single-fault tolerance. Verify that your Mark VI rack power supply can provide the additional +5V (3.0A) and ±15V (1.0A) current required by the IS200DSVOH2B. For smaller applications with only 1–4 actuator channels, the IS200DSVOH1A or IS200DSVOH1ABA may be more cost-effective.

Precautions and Important Notes

Always use ESD-safe procedures when handling the IS200DSVOH2B. Ensure the rack power supply has sufficient capacity for the increased power draw compared to H1 boards – inadequate power can cause output accuracy issues. Never connect the IS200DSVOH2B outputs to 4–20 mA current-loop actuators without proper conversion hardware. When replacing a IS200DSVOH1A with a IS200DSVOH2B, reconfigure ToolboxST channel mapping and scaling parameters to match the new board. Document all channel-to-actuator wiring before board removal. Verify that your actuator cables do not exceed the ±10 mA drive capability of the IS200DSVOH2B outputs. Do not mix IS200DSVOH2B with IS200DSVOH1A in a redundant pair; always use identical models for redundancy. Store spare IS200DSVOH2B boards in anti-static packaging and rotate inventory every 24 months. Consult GE application engineering for high-EMI installations or when using long field wiring runs.