Description
GE IS200SRTDH1ABB
I. Basic Information
Model: IS200SRTDH1ABB (short name: SRTD). It belongs to the Speedtronic Mark VI/VIe gas turbine control system, functioning as a dedicated simplex terminal acquisition board for RTD measurement. Matched with PRTD/VRTD master RTD processor cards, it executes field wiring connection, signal filtering and preprocessing for RTD platinum resistance sensors installed on unit bearing pads, stators and lube oil pipelines. It serves as standard spare part for shaft temperature monitoring of gas & steam turbines and supports full-system configurations including TMR triple modular redundancy, dual redundancy and simplex mode. Widely adopted for retrofitting legacy GE gas turbine control systems in thermal power and coal-to-chemical captive power plants, the module enables 24/7 uninterrupted cabinet operation.
Product Positioning: Field RTD sensor terminal adaptor board integrated with constant-current excitation source, input filtering and channel isolation. Preprocessed measured signals are transmitted via dedicated ribbon cables to PRTD/VRTD cards for A/D conversion and temperature calculation. It is a compact DIN-rail mounted replacement for obsolete TRTD-series terminal boards.
II. Technical Specifications
(1) Fundamental Hardware Parameters
- Brand: GE General Electric | Origin: USA
- Type: Simplex RTD Platinum Resistance Terminal Board (SRTD)
- Compatible System: Mark VI & Mark VIe Speedtronic gas turbine DCS, matched with IS220PRTDH1A / IS200VRTDH1D processor cards
- Mounting: Dual installation options – standard DIN35 rail mounting and flat cabinet fixing
- Overall Dimension: 148mm(W) × 122mm(D) × 52mm(H), Net Weight: 0.42kg
- Protection Class: IP20 (for cabinet indoor installation)
- Hardware Architecture: Full SMD multi-layer PCB with onboard hardware ID chip; the main controller automatically recognizes board model upon power-up without DIP switch configuration
Terminals: Double-layer removable European-style screw terminals with partitioned layout to prevent misconnection
(2) Rated Electrical Parameters
- Power Supply: Centralized DC24V powered by I/O backplane; total power consumption ≤5.5W with built-in reverse polarity and surge protection
- Input Channels: 8 independent RTD measuring channels
- Excitation Mode: Onboard precision constant-current source (1mA / 2mA software configurable); compatible with 2-wire, 3-wire and 4-wire all RTD wiring types
- Input Voltage Range: 0.3532V～4.054V, matching full resistance variation output of platinum RTD sensors
Channel Isolation: 1500VAC galvanic isolation per individual channel; short-circuit or open fault on one RTD loop causes no interference to temperature measurement of remaining channels
(3) RTD Compatibility Parameters
Supports mainstream industrial platinum RTD types: Pt100(385ppm/℃), Pt1000, Cu10, Ni100, covering all measuring scenarios of bearing bush, lube oil and motor stator temperature;
- Measurement Accuracy: Full-scale error ≤±0.15℃;
Open-Circuit Diagnostics: Automatic identification of RTD open circuit or line short fault; relevant fault codes are uploaded to Mark VIe upper monitoring software.
(4) Communication Interface Parameters
The board connects to PRTD/VRTD master cards via two dedicated ribbon cable ports. Digitized temperature data is transmitted over 100Mbps IONet industrial Ethernet with EGD protocol and IEEE1588 system-wide time synchronization, delivering millisecond-level data to gas turbine master controller for over-temperature trip interlock logic computation.
(5) Environmental Specifications
- Operating Temperature: -40℃～+70℃ (long-term cabinet operation)
- Storage Temperature: -40℃～+85℃ (warehousing & long-distance transportation)
- Operating Humidity: 5%～95% RH (non-condensing). Withstands dust, oil mist and VFD harmonic interference inside power control rooms and complies with IEC61000 industrial EMC standards.
III. Key Features
Universal Compatibility for 2/3/4-Wire RTD with Flexible Configuration
Each single channel supports software-defined wiring mode. Multiple types of platinum RTD probes can be mixed on one board to fit diversified field wiring conditions of different unit measuring points.
Independent Per-Channel Isolation for Single-Point Fault Containment
Short circuit or damaged wiring on any individual channel only triggers local fault alarm while the other seven channels maintain normal sampling, ensuring continuous critical shaft temperature monitoring of generating units.
Built-in Precision Constant-Current Source Ensures Superior Measuring Stability
High-precision onboard constant-current drive circuit eliminates temperature drift induced by lead resistance; 3-wire connection perfectly offsets voltage drop error from long field cables.
Intelligent Open-Circuit Self-Diagnosis Accelerates On-Site Maintenance
Instant fault reporting for broken RTD or loose wiring via both front-panel LED indicators and upper HMI system to shorten troubleshooting downtime.
Compact Rail Layout Saves Cabinet Space
Much smaller footprint compared with bulky traditional TRTD terminal boards; multiple SRTD modules can be installed side-by-side on DIN rail for dense measuring point arrangement and optimized cabinet wiring layout.
Seamless Drop-In Replacement within Same Product Series
IS200SRTDH1A and IS200SRTDH1ABB share identical terminal definition and pin assignment. Faulty legacy boards can be directly swapped without modification to field RTD secondary wiring or system control configuration.
IV. Working Principle
- Power-On Self-Test: After DC24V energization, the board runs self-check for power circuit, channel isolation circuit and ID chip, then completes handshake registration with PRTD/VRTD processor after successful diagnosis.
- RTD Signal Acquisition: Field Pt100 and other RTD sensors are connected to terminals; onboard constant-current source excites RTD elements and converts resistance variation into standard voltage signals.
- Signal Filtering & Conditioning: Input circuit suppresses field VFD interference and power-frequency noise via filtering and isolation processing.
- Data Conversion & Forwarding: Conditioned voltage signals are sent to PRTD/VRTD master card through ribbon cables for A/D conversion and resistance-to-temperature calculation.
- Data Upload & Fault Notification: Valid temperature data is packed and transmitted to Mark VIe controller over IONet for interlock logic; open-circuit and over-range faults are simultaneously alerted on upper monitoring system.
- Cyclic Sampling: Continuous round-the-clock loop of signal acquisition, processing and data upload for real-time temperature supervision.
V. Application Scenarios
(1) Heavy-Duty GE Gas Turbines (9F/6FA/5E Series)
RTD temperature collection for gas turbine bearing bushes, lube oil and generator stator winding, participating in over-shaft-temperature trip interlock and closed-loop lube oil temperature control.
(2) Steam Turbine Generating Units
Temperature monitoring for turbine journal bearings, thrust pads and casing cooling medium, matched with Mark VIe governing and excitation control systems.
(3) Waste Heat Captive Power Plants for Chemical & Steel Industry
Bearing temperature measurement for gas turbines and auxiliary equipment of waste heat boilers to realize process over-temperature interlock protection.
(4) Spare Part Retrofit for Obsolete GE Control Systems
Replacement of aging TRTD-series terminal boards and expansion of unit temperature measuring points with no changes to field RTD wiring or DCS configuration.
