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IS230SRTD2ASRTD2AG21 - Dual Simplex RTD Terminal Assembly Module is available in stock which ships the same day.
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SPECIFICATIONS:
Part Number: IS230SRTD2ASRTD2AG21
Manufacturer: General Electric
Series: Mark VIe
Board Type: Common Analog I/O Board
Number of channels: 8
Span: 0.3532 to 4.054 V
RTD Inputs: 8 channels
Excitation Current: 10 mA DC
Sampling Rate: 4
Terminal Block: 36
Grounding Terminals: E1 and E2
Connector to I/O Pack: DC-37 pin
Mounting: DIN rail
Max Cable Distance: 300 meters
Size: 8.25 cm high x 4.18 cm
Repair: 3-7 Days
Availability: In Stock
Weight: 2.5 Kg
Country of Origin: United States
FUNCTIONAL DESCRIPTION:
IS230SRTD2ASRTD2AG21 is a Dual Simplex RTD Terminal Assembly Module manufactured and designed by General Electric as part of the Mark VIe Series used in GE Distributed Turbine Control Systems. The SRTD board is a compact and efficient RTD terminal board specifically designed for versatile mounting options, including DIN-rail or flat mounting, making it suitable for various industrial control panels and enclosures. This board accommodates eight RTD inputs and serves as an interface by connecting directly to the PRTD or VRTD I/O processor, enabling precise temperature measurement and monitoring. The SRTD features high-density Euro-block type terminal blocks that ensure secure and reliable connections for RTD sensors, while also optimizing space on the board. An integral on-board identification chip provides automatic recognition of the board by the I/O processor, facilitating seamless system diagnostics and simplifying maintenance procedures.
Within the GE Mark VIe control systems, the SRTD board functions in tandem with the PRTD I/O pack, which supports communication through a DC-37 pin connector. This connector enables the I/O pack to communicate efficiently with the main controller over an Ethernet network, ensuring fast and reliable data transmission. It is important to note that the SRTD board supports only simplex configurations, meaning it manages single RTD input channels without redundancy. This design choice balances compactness and functionality, making the SRTD ideal for applications where simplex temperature measurement is sufficient, while still maintaining the high accuracy and integration required in modern turbine control systems.
INSTALLATION:
The SRTD board, along with a plastic insulator, is mounted securely onto a sheet metal carrier designed for easy installation on a standard DIN rail, providing a robust and space-efficient mounting solution commonly used in industrial control systems. For additional flexibility, the SRTD and its insulator can alternatively be mounted on a sheet metal assembly that bolts directly onto a cabinet, allowing for customized installation based on the specific layout and space constraints of the control panel or enclosure. This mounting versatility ensures that the SRTD can be adapted to various industrial environments while maintaining mechanical stability and ease of maintenance.
The board features eight RTD inputs, which are wired directly to a high-density Euro-style box-type terminal block comprising 36 terminals, available in two different configurations to suit wiring preferences and system requirements. The typical wiring practice involves using #18 AWG shielded twisted triplet cables, which help minimize electrical noise and interference, ensuring accurate temperature readings. The I/O cable shield terminal is connected through an external mounting bracket, which can be supplied either by General Electric or by the customer, providing a reliable grounding point to enhance signal integrity. Notably, terminals numbered 25 through 34 on the terminal block remain unconnected, reflecting reserved or unused pins within the wiring scheme. Additionally, the SRTD assembly includes two mounting holes, labeled E1 and E2, specifically designed for chassis ground screw connections (SCOM), allowing for proper grounding of the system to prevent electrical faults and enhance safety.
OPERATION:
The terminal board provides a 10 mA DC excitation current to each RTD sensor in a multiplexed manner, meaning the current is supplied sequentially rather than continuously, which helps reduce power consumption and sensor self-heating. This excitation current can be applied to RTDs whether they are grounded or ungrounded, offering flexibility in sensor installation. The system supports eight RTD inputs, allowing sensors to be placed up to 300 meters (approximately 984 feet) away from the turbine control cabinet, accommodating large turbine installations. The maximum allowable two-way cable resistance for each sensor circuit is 15 ohms, ensuring signal integrity over long distances. To enhance measurement reliability, the terminal board incorporates on-board noise suppression technology comparable to that used on the TRTD board, effectively minimizing electrical interference from surrounding equipment or cabling.
Signal acquisition and processing are managed by the PRTD I/O pack, which features an analog-to-digital (A/D) converter that samples each RTD input along with the excitation current multiple times per second. In normal scanning mode, each RTD signal is sampled four times per second, while fast scanning mode increases this rate to 25 samples per second, enabling more responsive temperature monitoring when needed. The sampling interval is synchronized with the power system frequency to reduce noise and improve measurement accuracy. Additionally, the processor performs linearization for 15 different RTD types, converting raw sensor data into precise temperature values tailored to the specific characteristics of each RTD sensor type, thereby ensuring accurate and reliable temperature readings for turbine control and protection functions.
WOC offers the largest inventory of replacement parts for GE Distributed Turbine Control Systems. We provide both unused and rebuilt boards backed by warranty as well as expert repair services for damaged units. Our team of professionals is available 24/7 to support all your OEM and automation requirements. For pricing and availability on components or repair services, please reach out to us via phone or email.
What is the maximum two-way resistance allowed for the RTD cables?
The system supports RTD sensor installations with a maximum two-way cable resistance of 15 ohms. This value includes the resistance of both the outgoing and return paths of the sensor wiring. Exceeding this resistance can result in inaccurate readings or failure to detect the sensor, especially over long cable runs up to 300 meters (984 feet).
What type of analog signal does the board process?
The module handles resistance-based analog signals generated by RTDs in response to temperature changes. These signals are not converted on the terminal board but are instead routed to an external I/O processor pack (such as the PRTD pack) where an analog-to-digital (A/D) converter digitizes the signals for further processing. The board's function is primarily to connect, excite, and filter these signals.
What are the supported RTD types?
The processor in the associated I/O pack is capable of linearizing up to 15 standard RTD types, enabling compatibility with a wide range of industry-standard sensors. These typically include Pt100, Pt200, Pt500, Pt1000, and Ni120, among others. This linearization ensures that the resistance values from the sensors are converted into accurate temperature readings.
