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SPECIFICATIONS:
Part Number: IS200STTCS2A
Manufacturer: General Electric
Series: Mark VIe
Product Type: Simplex Thermocouple Input Terminal Board
Number of channels: 12
Maximum Lead Resistance: 15Ω
Thermocouple types: E, J, K, S, T
Span: -8 mV to +45 mV
Analog output current: 0-20 mA
Size: 15.9 cm high x 17.8 cm wide
Frequency: 50 or 60 Hz
Repair: 3-7 Day
Availability: In Stock
Weight: 2 lbs
Country of Origin: United States
Manua: GEH-6721D
FUNCTIONAL DESCRIPTION:
IS200STTCS2A is a Simplex Thermocouple Input Terminal Board Manufactured and designed by General Electric as part of the Mark VIe Series used in GE Distributed Turbine Control Systems. The STTC terminal board is a compact terminal board designed for DIN-rail or flat mounting. The board has 12 thermocouple inputs and connects to either the PTCC thermocouple processor board on the Mark VIe or VTCC thermocouple processor board on the Mark VI. The onboard signal conditioning and cold junction reference are identical to those on the larger TBTC board. High-density Euro-Block type terminal blocks are mounted to the board, and two types are available. An on-board ID chip identifies the board to the processor for system diagnostic purposes. In the Mark VIe systems, the PTCC I/O pack works with the STTC. 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 STTC and a plastic insulator mount on a sheet metal carrier, which mounts on a DIN rail. The STTC and insulator mount on a sheet metal assembly that bolts directly into a panel. Thermocouples are wired directly to the terminal block using typical #18 AWG wires. The Euro-Block type terminal block has 42 terminals that can be fixed or removable. Two types of Euro-Block terminal blocks are available as follows:
OPERATION:
The connection of the STTC to the I/O pack or board that contains the A/D converter is shown in the following figure. The I/O pack or board provides excitation for the cold junction (CJ) reference on the terminal board. The 12 thermocouple signals plus the CJ signal and the connection to the identity chip (ID) come through connector JA1.
DIAGNOSTICS:
Each thermocouple type has hardware-limit checking (HLC) based on preset (non-configurable) high and low levels set near the ends of the operating range. If this limit is exceeded, a logic signal is set and the input is no longer scanned. If any one of the input hardware limits is set, it creates a composite diagnostic alarm. Each terminal board connector has its ID device that is interrogated by the I/O board. The board ID is coded into a read-only chip containing the terminal board serial number, board type, revision number, and the J connector location. If a mismatch is encountered, a hardware incompatibility fault is created. When operating with the I/O processor a very small current is injected into each thermocouple path. This is done to detect open circuits and is of polarity to create a low-temperature reading should a thermocouple open.
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What is a Simplex Thermocouple Input Terminal Board?
The Simplex Thermocouple Input Terminal Board is a device used to interface and read multiple thermocouples conveniently. It typically includes input terminals for connecting the thermocouple wires, a cold junction compensation circuit, signal conditioning, and an output for connecting to measurement or control systems.
How does the Simplex Thermocouple Input Terminal Board work?
The board receives signals from the thermocouples at its input terminals. It compensates for the temperature difference between the reference junction and the measurement point (cold junction compensation) to provide accurate temperature readings. The board may also perform signal conditioning to amplify and filter the signals before outputting them to the connected devices.
What types of thermocouples are compatible with this board?
The Simplex Thermocouple Input Terminal Board can generally work with various types of thermocouples, such as Type K, Type J, Type T, etc. The specific compatibility should be mentioned in the board's documentation.
