IS200TRTDH1CCC is a dedicated simplex RTD terminal transition board manufactured by GE Boards & Turbine Control for the GE Speedtronic Mark VIturbine control system and falls under the full IS200‑TRTD product line. Made in the US, it serves as the core front‑end interface component for temperature acquisition circuits of gas and steam turbines.
This board aggregates field wiring from 3‑wire RTD temperature transmitters and conducts front‑end signal filtering and conditioning. It connects to the in‑rack VRTD processor board via an onboard 37‑pin connector, transmitting converted resistive analog signals to the Mark VI main control system for A/D conversion, temperature calculation and real‑time monitoring. A single card supports up to 16 channels of 3‑wire RTD inputs, providing hardware connections for critical temperature measurement points including bearings, stators, casings and lube oil on turbine units. It is exclusively designed for simplex Mark VI non‑triple redundant configurations and not natively compatible with TMR triple modular redundant architecture; the TMR counterpart model is IS200TRTDH1BCC.
Product Features
1. Hardware Specifications
Channel Configuration: 16 independent 3‑wire RTD input channels. Each channel is equipped with intermittent 10mA DC excitation current (non‑continuous power supply to minimize self‑heating error of sensors).
Terminal Structure: Two sets of barrier‑style removable terminal blocks with 24 screw terminals per block, compatible with cables up to 12AWG (3.3mm²). A dedicated shield ground bus bar is reserved on the side of terminals for common connection to cabinet protective earth.
Onboard Connectors: Two rear‑mounted 37‑pin female DC connectors (JA1/JB1) on PCB for direct cabling to rack‑mounted VRTD acquisition board. Both connectors are utilized for Simplex configuration, whereas the TMR variant IS200TRTDH1BCC comes with six connectors.
Physical Dimension: 6.25 inch × 4.25 inch (158.75mm × 107.95mm), standard form factor for Mark VI rack slot with snap‑on rail mounting.
Environmental Ratings: Operating temperature: 0℃ to +60℃; storage temperature: -30℃ to +70℃; relative humidity 5%~95% non‑condensing; vibration compliance to IEC60068‑2 standard.
2. Electrical Characteristics
Withstand Voltage: Rated isolation withstand voltage 125V at terminal side and 500VAC between channels to protect onboard acquisition circuits against field stray voltage damage.
Lead Compatibility: Maximum permissible lead resistance per RTD channel is 15Ω, supporting regular field wiring up to 150 meters with automatic 3‑wire lead resistance compensation.
Output Range: Conditioned output voltage ranges from 0.3532V to 4.054V, matching the A/D sampling range of VRTD board.
Grounding Compatibility: Supports both grounded and ungrounded RTD sensors to accommodate field PT100 from various manufacturers.
3. Software Features
Automatic tag recognition after integration into Mark VI control software without manual channel configuration; PT100 resistance table is auto‑identified by the system. Functions including hardware relay output for overtemperature alarm, historical temperature curve logging and open‑circuit fault diagnostics for measuring points are available.
Core Advantages
Precision Temperature Measurement Design
High-frequency ground decoupling circuits and surge protection circuits are integrated at the input of all channels to suppress high-frequency interference and transient surges induced by on-site inverters and high-power contactors, eliminating voltage drop interference on long RTD field cables. Its measurement error meets the gas turbine industrial control tolerance of ±0.3℃.
User-Friendly Maintenance Structure
Adopted split front-rear isolated terminal blocks; the entire terminal assembly can be detached from the PCB without desoldering field wiring during on-site maintenance. Each terminal block features 24 screw terminals for individual cable removal and fault troubleshooting, effectively cutting equipment downtime for overhaul.
Built-in System Fault Tolerance
Supported by the multiplexing mechanism of the VRTD processor, damage to a single cable or failure of one individual channel will not result in loss of all 16-channel temperature data. Single-point faults are isolated to prevent false unit protection trips caused by full loss of temperature monitoring.
Native System Compatibility
Pin assignment, communication protocol and wiring definition are fully consistent with original Mark VI hardware and software. No extra signal isolation modules are required for direct connection to VRTD processor boards; compatible with mainstream industrial RTD types including PT100 and PT1000.
Robust Performance for Harsh Conditions
PCB manufactured with military-grade SMT technology and populated with industrial-grade components, suitable for severe high-temperature and dusty environments in power plants and petrochemical facilities. Factory-rated MTBF (Mean Time Between Failures) exceeds 120,000 operating hours.
Application Scenarios
Heavy-Duty Gas Turbine Control Systems
For Mark VI main control systems of GE 9F/6FA and E-class gas turbines, this board collects temperature data of compressor bearings, turbine casings, lube oil and stator windings, serving as critical temperature measurement hardware for unit startup/shutdown, load regulation and overtemperature protection.
Thermal Power Steam Turbine Units
It acquires temperature signals from turbine bearings, oil coolers and generator stators, matching with Mark VI safety protection systems and participating in ETS interlock logic for overspeed and overtemperature trip protection.
Captive Power Plants & Distributed Energy Stations in Petrochemical Industry
Used for temperature monitoring of industrial waste heat boilers and small gas generator sets, acting as front-end RTD acquisition modules for boiler drums and flue gas ducts.
Overseas Wind Power & Combined-Cycle Power Plants
Applied in renovation projects of GE combined-cycle units equipped with Mark VI control systems, for I/O expansion and replacement of obsolete legacy RTD terminal boards on ageing units.
Industrial Automation Spare Parts Replacement
Stock spare part for in-service existing Mark VI units and emergency replacement of faulty boards during shutdown; standard spare component for global power plant EPC upgrade projects.
FAQ
Q: Can IS200TRTDH1CCC and IS200TRTDH1BCC be directly interchanged?A: No. The 1CCC is a simplex version fitted with 2 connectors, while the 1BCC is a TMR triple-modular-redundant variant with 6 connectors. They differ entirely in internal wiring and system configuration. TMR units require the 1BCC model exclusively, and standard simplex Mark VI systems only support 1CCC. Incorrect installation leads to missing temperature tags and system I/O fault alarms.
Q: Each board supports only 16 RTD channels. How to expand channels when field measuring points exceed the limit?A: Install an additional IS200TRTDH1CCC in a vacant rack slot together with a matching VRTD processor board. The Mark VI system has no maximum limit on installed boards, and newly added channels will be auto-detected by system software.
Q: Is the board compatible with PT1000 RTD sensors?A: Factory default setting is for PT100. To adopt PT1000, modify the channel scale parameters on the host monitoring software; no hardware modification to the board is needed.
Q: Sporadic temperature fluctuation or value drift occurs on partial channels while other channels work normally?A: First check loose terminal screws and shielding earthing of RTD cables on faulty channels. Secondly eliminate interference from nearby variable-frequency drives by installing ferrite cores at terminal side of problematic channels; board hardware failure is unlikely.
Q: All 16 channels show open-circuit alarms with no valid temperature readings?A: Inspect loose rear 37Pin communication cables or power loss on the VRTD processor board. Power off the system, reseat the board and cabling; replace the dedicated 37Pin cable if the issue persists.
Q: Can I purchase replacement terminal blocks separately instead of replacing the whole PCB once terminals get damaged?A: The terminal blocks are non-standard OEM matching parts not available for individual sale. Full board replacement is required upon terminal damage; users are recommended to keep one spare board for maintenance.
Q: Frequent channel faults triggered under ambient temperature over 65℃?A: The board’s maximum rated operating temperature is 60℃. Fit cooling fans inside the cabinet and improve ventilation to bring ambient temperature below 60℃.
Q: New replacement board fails to be recognized by the control system after installation?A: Verify pin assignment of the 37Pin cable and slot position of the VRTD board, reboot Mark VI main controller and reload I/O hardware configuration.
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