SPECIFICATIONS
Part No.: IS200TRTDH1DCB
Manufacturer: General Electric
Country of Manufacture: United States of America (USA)
Span: 0.3532 to 4.054 V
Maximum lead resistance: 15 ohm
Temperature Operating: -30 to 65oC
Product Type: Resistance Temperature Device Terminal Board
Availability: In Stock
Series: Mark VIe
Functional Description
IS200TRTDH1DCB is a Resistance Temperature Device Terminal Board developed by GE. It is a part of the Mark VIe control system. The Resistance Temperature Device (RTD) terminal board is designed to accommodate 16 three-wire RTD inputs, facilitating temperature sensing and monitoring within the system. These inputs are connected to two barrier-type terminal blocks, ensuring secure and reliable wiring connections.
Features
- To safeguard against potential disturbances, such as surges and high-frequency noise, the inputs are equipped with built-in noise suppression circuitry. This feature helps maintain signal integrity and accuracy, even in challenging operating environments.
- The terminal board communicates seamlessly with one or more I/O processors, which play a crucial role in converting the analog temperature inputs into digital values. These digital temperature readings are then transmitted to the controller for further processing and system control.
Installation
- Wiring RTDs to Terminal Blocks: Connect the sixteen RTDs directly to two terminal blocks mounted on the TRTD terminal board. Ensure each terminal block is securely fastened using two screws. Use wires up to 12 AWG in size for the connections.
- Grounding and Shielding: Adjacent to each terminal block, locate the shield terminal strip attached to the chassis ground. Connect the shield terminal strip to ensure proper grounding and shielding, minimizing electrical interference.
Operation
- Excitation Current Supply: The terminal board provides a 10 mA dc multiplexed excitation current to each RTD, which can be grounded or ungrounded. This excitation current facilitates accurate temperature measurement from the RTDs.
- Distance and Cable Resistance: The 16 RTDs can be located up to 300 m (984 ft) from the turbine control cabinet. The maximum two-way cable resistance allowed is 15 ohm to maintain reliable signal transmission.
- Sampling and Scanning: The A/D converter in the I/O processor board samples each RTD signal and excitation current four times per second in normal mode scanning and 25 times per second in fast mode scanning. The sampling interval is related to the power system frequency. Linearization for 15 RTD types is performed in software, ensuring accurate temperature readings.
- Fault Detection and Handling: RTD open and short circuits are detected by out-of-range values. Faulty RTDs are removed from the scanned inputs to prevent adverse effects on other channels. Repaired channels are automatically reinstated after 20 seconds or can be manually reinstated.
- Decoupling and Redundancy: All RTD signals have high-frequency decoupling to ground at signal entry, minimizing interference. RTD multiplexing is coordinated by redundant pacemakers in the I/O processor to ensure uninterrupted operation, even in the event of cable or processor failure.
- TMR System Operation: In a Mark VI TMR system, VRTD boards in R, S, and T read RTDs simultaneously but with a skew of two RTDs. This ensures that no two VRTDs simultaneously excite the same RTD, preventing inaccurate readings and maintaining system integrity.
The WOC team is always available to help you with your Mark VIe requirements. For more information, please contact WOC.
Frequently Asked Questions
What is IS200TRTDH1DCB?
It is a Resistance Temperature Device Terminal Board developed by GE under the Mark VIe series.
What is the excitation current supplied to each RTD by the terminal board?
The terminal board provides a 10 mA dc multiplexed excitation current to each RTD, which can be grounded or ungrounded.
What is the maximum distance allowed between the RTDs and the turbine control cabinet?
The 16 RTDs can be located up to 300 m (984 ft) away from the turbine control cabinet.
How does the terminal board handle faults?
RTD open and short circuits are detected, and faulty RTDs are removed from the scanned inputs to prevent adverse effects on other channels. Repaired channels are automatically reinstated.
What is the sampling rate for signals?
The A/D converter samples each RTD signal and excitation current four times per second in normal mode scanning and 25 times per second in fast mode scanning.
