Key Parameters and Features
Core Features & Advantages
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Zero-Interruption Hardware Bypass: The board’s standout feature is its hardware-level 2oo3 bypass logic with a switching time of < 3.2 ns, enabling the excitation system to remain in closed-loop regulation even when the main InSync bus is offline for maintenance or upgrades. This supports “zero-downtime” upgrade strategies for critical generator units in power plants, LNG facilities, and marine propulsion systems .
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Multi-Signal Compatibility and Signal Conditioning: The board processes diverse analog signals including 4–20 mA inputs/outputs, LVDT/LVDR position signals, thermocouple inputs, and servo valve outputs. It performs signal scaling and conditioning optimized for turbine control environments, reducing the need for additional external transmitters .
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Protocol-Agnostic Communication: It supports multiple bus protocols—RS-485, CAN, Profibus DP, and proprietary serial interfaces—allowing flexible integration with existing control architectures without requiring network reconfiguration .
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Configurable Hardware Jumpers: The board features hardware jumpers (J1/J2 for mA output circuit selection, J5/J6 for 20 mA/200 mA current range, J7 for RS-232 test, J8 for oscillator activation) enabling customization for specific application requirements and functional testing .
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Hot-Swappable and Rugged Design: The board supports hot-swap replacement, with an average replacement time of under 2 minutes. Its aluminum housing and conformal coating provide resistance against salt spray and vibration (5 g), making it suitable for harsh industrial environments including marine and offshore applications .
Typical Applications
The IS200ISBBG2AAB is deployed in critical control systems where uninterrupted excitation is essential :
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Coal-Fired Power Plants: Enabling generator excitation maintenance while the unit remains online, reducing downtime by up to 80% in a 600 MW plant case study .
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Gas Turbine Control Retrofit: Improving fuel flow signal accuracy (4–20 mA) and cutting turbine efficiency losses by 3% in a natural gas power plant .
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Steel Mill Continuous Casting: Maintaining constant magnetic field during DC excitation system modifications to prevent steel billet breakage .
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LNG Pipeline Compressor Stations: Continuing to send torque limit commands to VFDs during bus maintenance to prevent compressor surge .
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Marine Propulsion Systems: Automatically taking over excitation control if the main frame fails due to salt spray corrosion during sea voyages .
Frequently Asked Questions (FAQ)
Q1: What is the primary function of the IS200ISBBG2AAB?
A: It is an InSync Bus Bypass PCB for GE EX2100 excitation systems and Mark VI turbine controls. Its role is to provide a hardware bypass channel that maintains critical excitation control data transmission when the main InSync bus is offline, ensuring uninterrupted generator excitation regulation .
Q2: Is the IS200ISBBG2AAB still in production?
A: The board is listed as in-service/active in the lifecycle phase by some sources, with long-term supply and technical support available. Availability is primarily through third-party suppliers and surplus channels .
Q3: Can the IS200ISBBG2AAB be hot-swapped?
A: Yes. The board supports hot-swap replacement when installed in redundant configurations, with an average replacement time of under 2 minutes. However, always confirm the redundant path is intact before removal .
Q4: What is the switching time of the bypass function?
A: The hardware-level bypass logic achieves a switching time of < 3.2 nanoseconds, ensuring seamless transition without disrupting excitation regulation .
Q5: What are the compatible complementary boards?
A: The board communicates with complementary boards including TCQC, STCA, and TCTG via dedicated connectors (3PL, JE, JD) to integrate into Mark V I/O cores R1/R2/R3 .
Q6: What is the significance of the hardware jumpers J1–J8?
A: The jumpers configure current ranges and enable functional testing: J1/J2 for mA output circuit selection; J5/J6 for 20 mA/200 mA current range; J7 for RS-232 card test; J8 for oscillator activation .
Q7: What should be checked before replacing the board?
A: Confirm the 24 VDC cabinet power is isolated before hot-swapping to prevent flyback converter surge damage to the backplane. Inspect edge connector gold fingers every 6 months and clean with isopropyl alcohol to prevent oxidation-related communication errors. Check onboard aluminum electrolytic capacitors every 12 months and replace the board if bulging is detected .
Recommended Models & Related Products
The IS200ISBBG2AAB is part of the GE EX2100 excitation and Mark VI turbine control ecosystem. Below are related models and components:
Selection Guidance: For existing EX2100 or Mark VI systems requiring InSync bus bypass capability, the IS200ISBBG2AAB is the correct part. Verify the functional revision (1A) and artwork revision (B) match your system configuration. For new installations or major upgrades, consult GE Vernova for current production alternatives.
