SPECIFICATIONS
Part Number: IS210DRTDH1A
Manufacturer: General Electric
Country of Manufacture: United States (USA)
Number of channels: 8
Span: 0.3532 to 4.054 V
Maximum lead resistance: 15 ohm
Series: Mark VI
Function: RTD Input Terminal Board
Functional Description
IS210DRTDH1A is an RTD Input Terminal Board developed by GE. It is part of the GE Speedtronic Mark VI gas turbine control system. This terminal board is responsible for collecting and transmitting temperature data from RTD sensors to the system’s processor board, ensuring accurate thermal monitoring and control of turbine components and auxiliary systems.
Design and Functionality
- Simplex RTD Input (DRTD) board engineered for DIN-rail mounting, offering a compact and space-efficient design suitable for control panel integration. Despite its small footprint, the board provides eight RTD input channels, enabling it to handle multiple temperature measurements simultaneously.
- It connects directly to the VRTD processor board through a single dedicated cable — the same type of cable used with the larger TRTD terminal board, ensuring compatibility and simplified system wiring. The DRTD terminal boards can also be stacked vertically on the DIN-rail to maximize space utilization within the control cabinet, a feature particularly beneficial in systems with multiple temperature measurement points.
Scalability and Integration
- A key advantage is its scalability. Two DRTD boards can be connected to a single VRTD processor board, providing support for up to 16 RTD inputs in total. This modular configuration allows system engineers to expand temperature monitoring capacity as needed without significant changes to the existing hardware setup.
- The board seamlessly integrates with the Mark VI control system, facilitating precise and reliable temperature feedback essential for turbine efficiency, protection, and performance optimization.
Installation
- Mounting the Board: Begin by attaching the plastic holder securely onto the DIN-rail within the control cabinet. Once mounted, slide the DRTD terminal board into the holder until it locks into position. This DIN-rail mounting method ensures mechanical stability while allowing easy removal or replacement when required.
- Wiring Connections: The board is equipped with a 36-terminal Euro-Block type connector, permanently fixed onto the terminal board to ensure reliable connectivity.
- Connect the wires from the eight RTDs directly to the designated terminals on the Euro-Block.
- Use 18 AWG shielded twisted triplet wires for optimal noise immunity and signal accuracy.
- Terminals 25 through 34 are provided as spare terminals, reserved for future expansion or maintenance flexibility.
- Terminals 35 and 36 are assigned for the SCOM (Signal Common or Ground) connection. It is critical that the ground connection is made using the shortest possible wiring distance to minimize noise and ensure signal integrity.
- This straightforward wiring and mounting process reduces installation time and supports efficient maintenance operations, while maintaining the high precision required in turbine temperature monitoring systems.
Diagnostics
Features an integrated diagnostic system designed to continuously monitor the health, accuracy, and reliability of RTD input signals. These diagnostics enhance fault detection, simplify troubleshooting, and improve system reliability. The diagnostic functions include the following checks:
- Hardware Limit Checking:
- Each RTD input channel is equipped with hardware-based high and low limit detection.
- These limits are preset and non-configurable, positioned near the boundaries of the RTD’s normal operating range.
- If the measured resistance or temperature exceeds these thresholds, the system sets a logic signal and stops scanning that particular input to prevent erroneous data propagation.
- When any input exceeds its hardware limit, a composite diagnostic alarm (L3DIAG_xxxx) is generated for the entire board.
- Individual diagnostic details can be reviewed via the GE Toolbox software interface.
- Diagnostic alarms may be configured to latch, requiring a manual RESET_DIA command to clear them after the fault is resolved.
- System Limit Checking:
- In addition to hardware limits, each RTD channel includes software-configurable system limits for high and low thresholds.
- These parameters can be adjusted by the user to define acceptable temperature operating ranges.
- The system limit logic can generate alarms, which can be configured as enabled/disabled and latching/non-latching depending on operational requirements.
- When triggered, the system out-of-limit signals can be cleared using the RESET_SYS command.
- In Triple Modular Redundant (TMR) systems, the limit logic signals are voted across controllers to produce a composite diagnostic output that appears consistently in each control module.
- RTD Resistance Validation:
- The input circuitry performs continuous resistance checks on each connected RTD.
- If the detected resistance deviates from the expected range (too high or too low), the system identifies it as a fault condition and generates a corresponding alarm.
- This ensures that sensor faults, wiring issues, or open circuits are quickly detected.
- Terminal Board Identification and Compatibility Check:
- Each connector contains a dedicated Identification (ID) device, which is automatically read by the I/O processor board during initialization.
- This read-only memory chip stores essential board information, including the serial number, board type, revision level, and connector position.
- If a mismatch or unrecognized ID is detected, the system triggers a hardware incompatibility fault, preventing potential configuration or communication errors.
WOC has the largest stock of Speedtronic Mark VI Spares, and we can repair your faulty spares with a warranty. WORLD OF CONTROLS can also supply unused and rebuilt components backed up with a warranty. Our team of experts is available round the clock to support your urgent needs related to critical spares, contact us.
FREQUENTLY ASKED QUESTIONS
What is IS210DRTDH1A?
It is an RTD Input Terminal Board and is part of the GE Mark VI gas turbine control system.
How many RTD inputs does the board support?
Each board supports 8 RTD inputs. Two boards can be connected to a VRTD processor board for a total of 16 temperature inputs.
How is the board installed?
The board is mounted on a DIN-rail using a plastic holder. RTD sensor wires connect directly to the 36-terminal Euro-Block, with terminals 25–34 reserved as spares. Terminals 35 and 36 are for the SCOM (ground) connection, which should be kept as short as possible.
What type of wiring is recommended?
18 AWG shielded twisted triplet wires are typically used to connect RTDs to the terminal board, ensuring accurate signal transmission and minimizing electrical noise.
How are faults indicated and cleared?
Diagnostic faults trigger composite alarms such as L3DIAG_xxxx. Hardware faults can be latched and reset using RESET_DIA, while system limit faults can be cleared with RESET_SYS. In TMR systems, limit logic is voted across controllers to provide a composite diagnostic output.
Can the boards be stacked to save space?
Yes, the DRTD terminal boards can be stacked vertically on the DIN-rail, optimizing control cabinet space without affecting functionality.
