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SPECIFICATIONS:
Part Number: IS230TRTDH2D
Manufacturer: General Electric
Series: Mark VIe
Product Type: Resistance Temperature Device Terminal Board
RTD Inputs: 16 channels
Input Type Supported Platinum: 100
Wiring Configuration: 3-wire
Excitation Current: 10 mA DC
Number of channels: 8
Terminals per Block: 24 terminals
Power supply voltage: 28 V dc
Voltage Range: 14 to 32 V dc
Mounting: DIN-rail mounting
Technology: Surface mount
Operating temperature: -30 to 65°C
Size: 30 cm high x 18 cm
Repair: 3-7 days
Availability: In Stock
Manual: GEH-6421M
Country of Origin: United States
FUNCTIONAL DESCRIPTION:
IS230TRTDH2D is a Resistance Temperature Device Terminal Board manufactured and designed by General Electric as part of the Mark VIe Series used in GE Distributed Gas Turbine Control Systems. The TRTD Resistance Temperature Device (RTD) Terminal Board is designed to accommodate up to 16 three-wire RTD inputs, providing accurate and reliable temperature measurements for industrial control systems. These RTD inputs are connected via two robust barrier-type terminal blocks, ensuring secure and stable wiring connections while also facilitating straightforward maintenance and installation. To maintain signal integrity in electrically noisy environments, the TRTD terminal board is equipped with integrated noise suppression circuitry. This circuitry effectively mitigates high-frequency interference and surge voltages, thereby enhancing the overall stability and accuracy of the temperature data.
Once the analog RTD signals are received, the TRTD board interfaces with one or more I/O processors, which are responsible for converting the analog signals into digital temperature values. These digitized values are then transmitted to the controller or control system for further processing, monitoring, and automation functions. The TRTD terminal board is a critical component in applications that demand precise temperature control and monitoring, such as turbine control systems, process automation, and power generation environments. Its high channel density, reliable noise immunity, and seamless integration with I/O modules make it a preferred solution in complex industrial settings. There are four versions of TRTD as follows:
INSTALLATION:
The sixteen Resistance Temperature Devices (RTDs) are connected directly to the TRTD terminal board through two high-quality terminal blocks. These terminal blocks are securely mounted on the board and are each fastened in place using two sturdy screws, ensuring mechanical stability and long-term reliability, even in high-vibration environments. Each block features 24 individual terminals, designed to accommodate wiring up to #12 AWG, allowing for low-resistance connections that support accurate signal transmission.
In addition to the terminal blocks, each assembly includes a shield terminal strip that is electrically bonded to the chassis ground. This strip is located immediately to the left side of each terminal block, providing a dedicated point for terminating the shields of RTD cables. This grounding setup is critical for minimizing the impact of electromagnetic interference (EMI) and maintaining signal integrity, especially in environments with high electrical noise.
The thoughtful layout and robust construction of the terminal blocks and grounding system not only simplify installation and maintenance but also enhance the overall performance, accuracy, and noise immunity of the RTD input system. This makes the TRTD terminal board a dependable choice for demanding industrial applications where temperature monitoring and precision are paramount.
OPERATION:
The TRTD terminal board delivers a 10 mA DC excitation current to each RTD input. This excitation is multiplexed, meaning it is applied intermittently rather than continuously, optimizing signal processing and reducing power consumption. The system is compatible with both grounded and ungrounded RTDs, offering flexibility in sensor installation. The 16 RTDs can be installed at distances of up to 300 meters (984 feet) from the turbine control cabinet. However, the total two-way cable resistance must not exceed 15 ohms to ensure signal accuracy and integrity.
Each RTD signal, along with its corresponding excitation current, is sampled by an Analog-to-Digital (A/D) converter located in the I/O processor board. Sampling occurs four times per second in normal mode and 25 times per second in fast mode, with timing intervals synchronized to the power system frequency. This allows for precise temperature monitoring that aligns with the operational frequency of the system.
The system supports software-based linearization for up to 15 different RTD types, ensuring accurate temperature readings across a wide range of sensor models. To maintain reliability, the system continuously checks for open or short circuits, detecting faults through out-of-range values. Any RTD channel identified as operating outside of hardware-defined limits is automatically removed from the active scan, thereby preventing the faulty sensor from interfering with the operation of other input channels. Once repaired, the channel is automatically reinstated after 20 seconds, or it can be manually restored by an operator.
WOC offers the largest inventory of replacement parts for GE Distributed Control Systems, featuring both new and refurbished modules, all backed by a reliable warranty for your peace of mind. Our experienced support team is available 24/7 to assist with all your OEM and industrial automation requirements. For inquiries about pricing, availability, or repair services, please don’t hesitate to reach out via phone or email. We are always here to support you.
What type of RTD inputs does the terminal board support?
The terminal board supports 16 three-wire RTD inputs. It is compatible with a variety of RTD types, including PT100, and uses software linearization to accommodate up to 15 different RTD curves. This flexibility ensures accurate temperature readings for a wide range of industrial applications.
How is the excitation current supplied to each RTD?
Each RTD is supplied with a 10 mA DC excitation current that is multiplexed rather than continuous. This means the excitation is applied sequentially, reducing thermal loading on the RTDs and improving measurement accuracy without compromising signal integrity.
What types of RTD sensors can be connected to an RTD input terminal board?
Most RTD input terminal boards are designed to work with commonly used RTD sensor types such as Pt100, Pt1000, or Ni100. They may also support different temperature ranges and configurations.
What is the maximum distance allowed between the RTD and the control cabinet?
RTDs can be installed up to 300 meters (984 feet) away from the turbine control cabinet. However, to maintain signal accuracy, the total two-way cable resistance must not exceed 15 ohms. This ensures reliable signal transmission over long distances.
