Product Core Brief
- Model: IS200TTURH1CFD
- Brand: General Electric (GE Vernova)
- Series: Speedtronic Mark VIe Turbine Control & Safety Platform
- Core Function: Conformal coated turbine terminal board that provides field wiring termination, signal conditioning, and relay drive logic for speed pickups, overspeed trip circuits, and generator synchronizing breakers; mates with VTUR/PTUR I/O processor packs for primary turbine protection logic
- Product Type: Field termination PCB paired with Mark VIe turbine protection I/O packs
- Key Specs: 48 total screw terminal I/O points | 3 onboard safety relays | 12 pulse sensor input support | 125 Vdc breaker coil drive output | full conformal coating
- Condition: New Original (New Surplus), active OEM power generation spare with no formal end-of-life schedule
Key Technical Specifications
表格
| Parameter | Defined Value |
|---|---|
| Field Termination Hardware | Dual pluggable 24-position screw terminal blocks; 48 total I/O circuit points |
| Supported Field Signals | 12 magnetic/eddy-current pulse speed sensors; 125 Vdc breaker trip coil drive; discrete trip interlock contacts |
| Onboard Electromechanical Relays | K25, K25P, K25A trip/synchronization relays for simplex/TMR voting logic |
| Backplane Interfaces | D-Sub PR3, JR4 (simplex); PS3, PT3, JS4, JT4 connectors for triple modular redundant rack layouts |
| Surface Treatment | Full PCB conformal coating for humidity and corrosive cabinet environments |
| Channel Isolation Rating | 1500 Vrms galvanic isolation between field wiring and IONet backplane circuits |
| Rack Supply Input | 24 VDC ±10% filtered power from Mark VIe I/O rack backplane |
| Typical Continuous Power Draw | 6.1 W under full loaded trip relay conditions |
| Standard Operating Temp | -30°C to +65°C; coated design extends stable operation to -40°C to +85°C offshore enclosures |
| Humidity Tolerance | 5%–95% RH non-condensing cabinet atmosphere |
| Physical Dimensions | 330 mm W × 178 mm H × 42 mm D; unit weight 0.76 kg |
| Compliance Standards | UL 508, CE EMC Class A, IEC 61508 SIL 2 turbine safety rated, IEEE 1613 power control standard |
| Reference System Manual | GEH-6721 Volume II Mark VIe System Hardware Guide |
Product Introduction
This termination board acts as the physical wiring bridge between VTUR/PTUR speed protection I/O packs and all turbine overspeed, shaft speed, and generator synchronization field hardware. Onboard relays use jumper-selectable 2-out-of-3 voting for TMR safety racks or simplex single-channel trip logic to match plant protection architecture.
The conformal coated PCB mitigates corrosion in coastal and outdoor turbine control cabinets. It cannot execute speed calculation or trip threshold logic independently; all safety algorithms run on the paired VTUR primary I/O pack installed in the Mark VIe rack card slots.
Firmware/Software Versions & Upgrade Notes
Minimum compatible Mark VIe configuration software: ToolboxST v08.05. All VTUR speed processor packs paired with this termination board must run matching firmware builds; mismatched firmware disables 2oo3 relay voting and triggers persistent IONet LINK fault alarms.Downgrades below v08.05 remove automatic pulse sensor fault diagnostics and jumper configuration validation reporting. All firmware flashes target the VTUR processor packs over the rack IONet bus; no programmable firmware resides on the unit itself. Always export speed sensor scaling, overspeed trip setpoints, and jumper voting layout documentation before initiating any controller firmware update. Relay jumper positions must be re-verified post-flash to restore correct TMR/simplex safety logic.
Frequently Asked Questions (FAQ)
- Is hot-swap operation safe while the Mark VIe rack remains energized?The VTUR main speed processor pack supports hot-swap with rack power active, but technicians must fully power down the I/O chassis to remove or replace the unit. Pulling the terminal board under energized conditions creates high voltage transients across speed sensor and breaker coil wiring that damage the VTUR pulse input ADC circuits and disable overspeed protection permanently.
- Is this terminal board obsolescent, and are direct drop-in hardware upgrades available?This board remains an active OEM spare for Mark VIe gas and steam turbine fleets with no published end-of-life date. The cross-compatible uncoated variant IS200TTURH1B is not a direct swap; it lacks corrosion protection jumpers and requires cabinet environmental revalidation before commissioning. TTURS1C is the SIL3 safety upgrade variant with additional surge suppression.
- Will overspeed trip thresholds, pulse sensor tooth counts, or voting jumper logic erase if the rack loses full power?All speed scaling values, trip setpoints, and TMR voting software logic store in non-volatile flash memory on the paired VTUR I/O pack. The terminal board contains zero user-programmable logic storage; only physical jumper positions define simplex/TMR relay operation, which remain static unless manually repositioned. Full rack power loss does not erase any software-based speed protection configuration data.
- What warranty terms separate New Surplus inventory from refurbished alternatives?New Surplus terminal boards carry a 12-month functional warranty covering PCB trace continuity, screw terminal torque retention, relay coil integrity, channel isolation barriers, and D-Sub connector contact resistance. Refurbished units typically offer only 3–6 month limited coverage and carry hidden risks of degraded isolation capacitors, corroded terminal lugs, and worn relay contacts that generate intermittent overspeed false trips during turbine load transients.
- Why does New Surplus pricing sit higher than generic used/refurbished marketplace listings?All New Surplus inventory completes standardized QC validation: serial traceability cross-check against OEM production logs, 24-hour thermal soak bench testing with simulated pulse sensor traffic and relay coil actuation cycles, 500 V megger insulation testing verifying >100 MΩ channel-to-ground isolation, full jumper voting configuration validation, and anti-static sealed foam packaging. Refurbished lots skip this multi-step validation workflow, introducing unplanned downtime risk for safety-critical turbine overspeed protection loops.
- Can analog 4–20mA transmitters or standard RTD temperature sensors wire directly to the screw terminal blocks?No, every terminal pin is dedicated to pulse speed sensors and 125 Vdc trip relay circuits. Analog and thermal measurement signals require separate Mark VIe termination boards such as IS200SHRAH2AED or IS200TADC. Verify with GEH-6721 Volume II before modifying field wiring to avoid permanent channel circuit damage.
- Does the terminal board locally store overspeed fault snapshots or long-term speed trending data?No, the PCB has no on-board memory or signal processing hardware. All speed amplitude trending records, overspeed trip fault event logs, and pulse sensor diagnostic counters are captured and retained exclusively by the Mark VIe rack’s primary system controller CPU. The unit only delivers passive wiring termination and relay drive hardware for turbine safety trip circuits.
