GE IS220SRTDH2A Simplex RTD Board

GE IS220SRTDH2A Simplex RTD Board

Part Number IS220SRTDH2A Manufacturer General Electric Country of Manufacture As Per GE Manufacturing Policy Series Mark VI/VIe Function Module Availability In StockIS220SRTDH2A is a Simplex Resistance Temperature Device Input Terminal Board Manufactured and Designed by General Electric as part of the Mark VIe Series used in GE Distributed Turbine Control Systems. The Simplex Resistance Temperature Device (RTD) Input (SRTD) terminal board is a compact RTD terminal board, designed for DIN-rail or flat mounting. The board has eight RTD inputs and connects to the PRTD I/O processor. 

High-density Euro-block type terminal blocks are mounted to the board. An on-board ID chip identifies the board to the I/O processor for system diagnostic purposes. In the Mark* VIe systems, the PRTD I/O pack works with the SRTD. The I/O pack plugs into the DC-37 pin connector and communicates with the controller over Ethernet. Only simplex systems are supported. INSTALLATION: The SRTD and a plastic insulator mount on a sheet metal carrier that mounts on a DIN rail. Optionally the SRTD and insulator mount on a sheet metal assembly that bolts directly to a cabinet. The eight RTDs are wired directly to the Euro-style box-type terminal block, which has 36 terminals and is available in two types. Typically #18 AWG wires (shielded twisted triplet) are used. The I/O cable shield terminal uses an external mounting bracket supplied by GE or the customer. 

Terminals 25 through 34 are not connected. E1 and E2 are mounting holes for the chassis ground screw connection (SCOM). OPERATION: The terminal board supplies a 10 mA dc multiplexed (not continuous) excitation current to each RTD, which can be grounded or ungrounded. The eight RTDs can be located up to 300 m (984 ft) from the turbine control cabinet with a maximum two-way cable resistance of 15. The onboard noise suppression is similar to that on the TRTD. The RTD inputs and signal processing are illustrated in the figure. The A/D converter in the PRTD pack samples each signal and the excitation current four times per second for normal mode scanning, and 25 times per second for fast mode scanning, using a time sample interval related to the power system frequency. Linearization for the selection of 15 RTD types is performed by the processor.

Features

Multiple RTD Inputs: With a total of eight RTD inputs, the SRTD board provides ample capacity for connecting multiple sensors. These inputs enable the board to receive temperature data from various points within the system, contributing to comprehensive temperature monitoring.

Connectivity to I/O Processors: The board interfaces with either the PRTD or VRTD I/O processor, facilitating communication and data exchange between the RTD inputs and the processor. This connection ensures efficient processing of temperature data and enables the board to effectively contribute to system control and monitoring functions.

Euro-Block Terminal Blocks: Mounted on the board are high-density Euro-block type terminal blocks, which provide secure and reliable connections for wiring. These terminal blocks offer robustness and ease of use, facilitating straightforward installation and maintenance procedures.

Integrated ID Chip for Diagnostic Identification: An onboard ID chip plays a crucial role in identifying the board to the I/O processor for diagnostic purposes. This chip enhances system diagnostics by providing essential information about the board, aiding in troubleshooting and maintenance tasks.

Installation

Mounting Configuration: Along with a plastic insulator, it is mounted onto a sheet metal carrier, which in turn is affixed to a DIN rail. Alternatively, the SRTD and insulator can be mounted on a sheet metal assembly directly bolted into a cabinet.

Terminal Block Connection: Equipped with a Euro-style box type terminal block, featuring 36 terminals in two types. The eight RTDs are directly wired to this terminal block. Typically, 18 AWG wires, such as shielded twisted triplets, are used for wiring purposes.

Shield Terminal: It's important to note that there is no shield terminal strip included in this design. If shielded wiring is utilized, an external mounting bracket supplied by GE or the customer must be used for the I/O cable shield terminal.

Unused Terminals: Terminals 25 through 34 on the terminal block are not connected during installation.
Grounding: Mounting holes labeled E1 and E2 serve as attachment points for the chassis ground screw connection (SCOM), ensuring proper grounding of the SRTD assembly.

Diagnostics

In normal operating conditions, the RUN status is indicated by a flashing green LED, while a solid red LED signifies a FAIL condition. The third LED remains off under normal circumstances but illuminates a steady orange to indicate the presence of a diagnostic alarm condition on the board. The diagnostic checks encompass two primary types: hardware limit checking and system limit checking, ensuring thorough scrutiny of all inputs:

Hardware Limit Checking: Each RTD type undergoes hardware limit checking based on preset high and low levels situated near the operational range extremes. If these limits are exceeded, a logic signal is triggered, and the input ceases to be scanned. Any hardware limit set for the 00 input triggers a composite diagnostic alarm, denoted as L3DIAG PRTD, pertaining to the entire board. Detailed diagnostics for individual signals are accessible through the toolbox. Additionally, these diagnostic signals can be individually latched and reset using the RESET DIA signal.

System Limit Checking: System limit checking is performed on each RTD input based on configurable high and low levels. These limits can be configured to generate alarms and can be toggled between enable/disable and latching/non-latching modes. The RESET SYS signal resets any out-of-limit signals. In TMR systems, limit logic signals are voted, and the resulting composite diagnostic is available in each controller.