SPECIFICATIONS
Part No.: IS200TRTDH1BBB
Manufacturer: General Electric
Country of Manufacture: United States of America (USA)
Input Supply: 125 vdc
Frame Rate: Upto 100Hz
Span: 0.3532 to 4.054 V
Maximum lead resistance: 15 ohm maximum
Product Type: TRTD Resistance Temperature Board
Availability: In Stock
Series: Mark VI
Functional Description
IS200TRTDH1BBB is a TRTD Resistance Temperature Board developed by GE. It is part of the Mark VI series. The terminal board is a component designed to facilitate the integration and processing of Resistance Temperature Device (RTD) inputs within the system architecture. The board accommodates a total of 16 RTD inputs, each utilizing a three-wire configuration. This design ensures compatibility with a wide range of RTD sensors commonly used for temperature measurement applications.
Features
- Terminal Block Configuration: The RTD inputs are wired to two barrier-type terminal blocks mounted on the TRTD board. This arrangement provides a convenient and organized interface for connecting RTD sensors to the terminal board.
- Noise Suppression Circuitry: To enhance reliability and accuracy, the board incorporates noise suppression circuitry. This circuitry serves to protect against surge and high-frequency noise, ensuring stable and precise measurement of temperature values from the RTD sensors.
- Communication Protocol: The TRTD terminal board communicates with one or more I/O processors within the system architecture. These I/O processors are responsible for converting the analog temperature inputs from the RTDs into digital temperature values. The digital temperature values are then transferred to the controller for further processing and monitoring.
- Digital Temperature Conversion: Upon receiving the analog temperature inputs from the RTDs, the connected I/O processors perform digital conversion, transforming the analog signals into digital temperature values. This conversion process enables accurate and standardized temperature measurement across the system.
- Excitation Current Specifications: Each RTD is supplied with a 10 mA DC excitation current, which operates in a multiplexed (not continuous) mode. This current is crucial for activating and measuring the RTD signals accurately.
Grounding Options and Location Flexibility
- The RTDs have the flexibility of being either grounded or ungrounded. They can be positioned up to a maximum distance of 300 meters (984 feet) from the turbine control cabinet, provided the two-way cable resistance does not exceed 15 ohms. This extensive range offers installation versatility within the specified resistance limits.
Signal Sampling by A/D Converter
- The Analog-to-Digital (A/D) converter housed in the I/O processor board samples each RTD signal and the excitation current four times per second during normal mode scanning. For fast mode scanning, this rate increases to 25 times per second. The time intervals for sampling are intricately related to the power system frequency, ensuring synchronization and accurate data acquisition.
Linearization Process for RTD Types
- Linearization, a critical process for accurately translating raw RTD signals into meaningful temperature readings, is performed in software. This allows for the handling and linearization of 15 different types of RTDs.
- The software-driven linearization process ensures precise temperature calculations for the various RTD types supported by the system.
Signal Span and Voltage Range
- The RTD signals operate within a specific voltage span, ranging from 0.3532 to 4.054 volts. This span defines the range over which the RTD signals are expected to vary in a given operational scenario.
Maximum Lead Resistance
- The system accommodates a maximum lead resistance of 15 ohms, ensuring that the two-way cable resistance within this limit prevents signal degradation and ensures accurate RTD readings.
Fault Detection Mechanisms
- High/Low (Hardware) Limit Check: Implemented as a hardware-based safeguard, constantly monitoring for signal values exceeding predetermined high or low limits. This check helps prevent erroneous readings caused by extreme values.
- High/Low (Software) System Limit Check: This software-based check acts as an additional layer of protection, verifying signal values against predefined high and low limits within the system's software. It aids in identifying abnormalities in RTD signals that may not be detected by hardware checks alone.
- Failed ID Chip: The system is equipped with the capability to interrogate ID chips embedded in the terminal board connectors. In case of a mismatch or failure in reading the ID chip, a fault is detected, alerting operators of potential hardware incompatibility or connectivity issues.
The WOC team is always available to help you with your Mark VI requirements. For more information, please contact WOC.
Frequently Asked Questions
What is IS200TRTDH1BBB?
It is a TRTD Resistance Temperature Board developed by GE under the Mark VI series.
How are RTD signals shielded against high-frequency interference upon entry into the system?
All signals undergo high-frequency decoupling to ground as they enter the system. This decoupling mechanism effectively suppresses high-frequency interference, ensuring stable and accurate readings.
What measures are in place to prevent the loss of RTD signals in the event of a cable or I/O processor failure?
RTD multiplexing on the I/O processor is overseen by redundant pacemakers. This redundancy ensures that the loss of a single cable or the failure of an I/O processor doesn't result in the loss of any RTD signals in the control database, maintaining continuous data integrity.
How are RTD readings managed in a Mark VI TMR system to prevent signal conflicts?
In a Mark VI TMR system, VRTD boards in the R, S, and T modules read RTDs simultaneously but in a staggered manner. This ensures that no two VRTDs simultaneously excite the same RTD, avoiding conflicts and ensuring accurate readings.
