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TECHNICAL SPECIFICATIONS:
Part Number: IS200STURH4A
Manufacturer: General Electric (GE) / GE Industrial
Series: Mark VI & Mark VIe
Functional Acronym: STUR
Product Type: Primary Turbine Protection Input Terminal Board
Hardware Revision: REV A
Redundancy Configuration: Simplex (S-Type)
I/O Pack Interface: One DC-62 pin connector matching the PTUR pack
Trip Board Linkage: One DC-37 pin connector matching the trip relay boards
Terminal Blocks: One 48-screw terminal strip along one edge
Overspeed Inputs: 4 channels for passive MPU or active sensors
Sensing Voltage Ranges: Dual PT inputs (16 V DC to 140 V DC tracking)
Trip Solenoid Outputs: Two channels monitored by K1 and K2 safety relays
Circuit Board Protection: High-grade Conformal PCB Coating
Ambient Operating Temperature: -30°C to +65°C (-22°F to +149°F)
Repair Lead Time: 3–5 Business Days
Availability: In Stock / Repair & Exchange Available
Country of Origin: United States
The IS200STURH4A is a Simplex Primary Turbine Protection Input Terminal Board developed by General Electric for the Speedtronic Mark VI and Mark VIe control ecosystems. This board functions as a localized field termination point that consolidates safety-critical inputs, including mechanical overspeed data, primary generator synchronization signals, and emergency trip wiring loops. It routes these critical parameters directly to a single associated processing core, reducing panel footprint while maintaining industrial-grade safety protection.
TURBINE FREQUENCY SCANNING & INTERFACING:
The card architecture is structurally optimized to capture, isolate, and route raw operational speed waveforms without introducing data bus delays or processing latency. The termination block supports up to four speed pulse input loops connected directly to active proximity probes or passive magnetic pickups (MPUs) facing a toothed wheel on the main turbine rotor shaft.
The onboard hardware layer cleans incoming frequency variations through high-impedance filtering circuits to process raw alternating current inputs. This optimizes zero-crossing detection parameters across variable physical gear tooth dimensions while maintaining baseline signal validation to differentiate zero rotor RPM from open-loop line breaks. It then channels these precise pulse streams across the DC-62 pin connector interface directly to the underlying PTUR Primary Turbine Protection input/output pack for real-time overspeed processing and calculation.
POWER ACQUISITION & SYNCHRONIZATION MATRIX:
Beyond rotational dynamics, the IS200STURH4A accommodates automated generator-to-grid synchronization sequences. It tracks phase, frequency, and wave amplitude parameters by executing real-time measurements across two separate Potential Transformer (PT) analog input lines.
These hardware traces monitor the live electrical bus voltage and the turbine generator output terminals. The analog bus and generator potential transformer circuits utilize galvanic isolation transformers coupled with physical hardware filtering to sample AC waveforms safely without exposing the underlying 62-pin logic interface to common-mode electrical transients or grounding grid offsets. This allows the Mark VIe synchronization algorithm to safely command main breaker closures via on-board secondary control paths.
RESILIENT TRIP CIRCUIT EXECUTIONS
To enforce fail-safe turbine shutdown logic, the board integrates physical safety relays designated K1 and K2 that drive primary turbine trip solenoids. The field circuit loops monitor structural emergency stop inputs, electronic overspeed conditions, and local status interlocks.
The board interfaces directly with external mechanical trip boards (such as TRPG, TRPS, or TPRA blocks) through a dedicated 37-pin connector trace. It utilizes hardwired logic to interrupt the active power rail feeding the primary turbine trip solenoids when a hardware interlock or microcode trip parameter triggers. In an overspeed configuration, flameout detection, or primary software trip execution, the underlying logic drops power to the trip string relays instantly, forcing field-side dump valves into their safe, deactivated state.
OPERATION:
BOARD GROUPS: There are four different configurations of STUR available. With fixed box terminals, STUR is not possible. It makes use of pluggable connections. For employing an external trip board, two groups provide DC-37 pin connectors and two groups provide on-board trip relays. Two groups utilized for mechanical applications will have components removed, while groups used for generator applications will have more components added.
SPEED INPUT: Four speed input circuits are offered by STUR and can accommodate either passive or active speed sensors. Signal application for passive sensors occurs between terminals PR# H and PR# L, where # is one through four. The PTUR I/O pack can detect speeds as low as 2RPM thanks to the passive sensor input's sensitivity. Signal application occurs between terminals TTL# and PR# L when active speed sensors are being used.
TRIP RELAYS: Two trip solenoid outputs, K1 and K2, are provided by STUR version H1 and H2 and are each made up of a safety relay that makes use of forcibly steered contacts. PTUR receives relay position info from one of the relay's contact pairs. To link two or three STUR boards in a redundant tripping arrangement, additional customer terminals are offered.
WHY PARTNER WITH WORLD OF CONTROLS
World of Controls provides the industry's most dependable logistics and technical infrastructure for critical turbine control networks. We maintain an extensive inventory of genuine OEM replacement parts for GE Distributed control setups, minimizing operational downtime during emergency outages. Every item, from certified unused surplus to fully rebuilt industrial components, is subjected to strict simulation profiling in our advanced electronics lab and is supplied with a comprehensive product warranty. Our global engineering support network operates 24/7 to deliver troubleshooting advice, component replacement guidance, and component testing evaluations. Contact the WOC sales team directly via phone or email for current pricing, hardware availability, or repair quotes.
What is the GE IS200STURH4A?
The GE IS200STURH4A is a Simplex Primary Turbine Protection Input Terminal Board designed for the Mark VI and Mark VIe systems. It acts as a dedicated field termination module that gathers and routes overspeed data, synchronization signals, and emergency trip commands to a central processing unit. By consolidating these critical parameters onto a single card, it ensures robust hardware-level protection and emergency monitoring for industrial turbines.
What is the exact terminal point capacity of the terminal boards?
The board features a total termination capacity of 48 connection points. These points are structurally organized into a single 48-screw terminal strip layout along one edge of the printed circuit board. This modular setup allows field technicians to disconnect entire wiring blocks quickly during maintenance without altering individual field wires.
How many independent overspeed pickup channels are built into the board hardware?
There are 4 dedicated channels integrated into the circuit board architecture to capture rotational dynamics. These channels interface seamlessly with either active proximity probes or passive magnetic pickup (MPU) sensors tracking the rotor shaft. The multi-channel framework ensures comprehensive frequency capturing for precise overspeed validation.
What is the continuous voltage input range for the potential transformer synchronization circuits?
The potential transformer tracking circuits accommodate a continuous voltage monitoring range spanning from 16 V DC up to 140 V DC. This wide tracking index allows the system to accurately evaluate and sample alternating current waveforms. This real-time scaling is critical for managing generator-to-grid auto-synchronization sequences.
How many pins are configured on the primary and auxiliary cable connection headers?
The board incorporates a main 62-pin right-angle connector alongside an auxiliary 37-pin connector interface. The high-density 62-pin header bridges raw field signals directly to a mated companion PTUR processing pack. Meanwhile, the 37-pin trace establishes a dedicated link to heavy-duty mechanical emergency trip relay boards.
What electrical isolation threshold protects the logic interface from the synchronization lines?
A robust 1500 V RMS galvanic isolation boundary is built into the potential transformer lines to insulate the core microprocessor elements. This isolation is achieved using high-grade, surface-mounted toroidal isolation transformers combined with hardware filtering networks. The layout completely blocks common-mode electrical transients, line spikes, or grounding differentials from corrupting the logic rails.
