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SPECIFICATIONS:
Part Number: IS230TBTCH2C
Manufacturer: General Electric
Series: Mark VIe
Product Type: Thermocouple Input Terminal Board
Number of Channels: 24
Thermocouple types: E, J, K, S, T
Span: -8 mV to +45 mV
Mounting Type: DIN-rail
Communication Protocol: Modbus RTU
Operating Temperature: -20°C to +70°C
Communication Interface: RS485
Common Mode Voltage Range: ±5 V
Dimensions: 120 mm x 90 mm x 40 mm
Operating temperature: 0 to 60 °C
No.of Analog Voltage Inputs: 6
Repair: 3-7 Day
Weight: 250 grams
Availability: In Stock
Country of Origin: United States
Manual: GEH6721D
FUNCTIONAL DESCRIPTION:
IS230TBTCH2C is a Thermocouple Input Terminal Board manufactured and designed by General Electric as part of the VIe Series used in GE Distributed Gas Turbine Control Systems. The thermocouple terminal board TBTC accepts 24 type E, J, K, S, or T thermocouple inputs. These inputs are wired to two barrier-type blocks on the terminal board. Communication with the I/O processor is through DC-type connectors. There are two types of terminal board as follows:
In the Mark VIe system, the PTCC I/O pack works with the TBTC board. Simplex, dual, and TMR systems are supported. In simplex systems, two PTCC packs plug into the TBTCH1C for a total of 24 inputs. With the TBTCH1B one, two, or three PTCC packs plug-in supporting a variety of system configurations, only 12 inputs are available.
INSTALLATION:
Thermocouples are wired directly to two I/O terminal blocks. These removable blocks are mounted on the terminal board and held down with two screws. Each block has 24 terminals accepting up to #12 AWG wires. A shield terminal strip attached to the chassis ground is located on the left side of each terminal block. Mark VI systems are cabled from the board J-type connectors to the I/O processors in the VME rack. Mark VIe systems have I/O packs that plug into the board J-type connectors. The number of cables or I/O packs depends on the level of redundancy required.
OPERATION:
The 24 thermocouple inputs can be grounded or ungrounded. They can be located up to 300 m (984 ft) from the turbine control panel with a maximum two-way cable resistance of 450. High-frequency noise suppression and two cold junction reference devices are mounted on TBTC. The analog-to-digital conversion is in the I/O processor, also the linearization for individual thermocouple types. In simplex systems using TBTCH1C, one VTCC is used in Mark VI systems. The Mark VIe system has two PTCC packs plugged into the TBTC terminal board obtaining 24 thermocouple inputs. For TMR systems using TBTCH1B, the thermocouple signals fan out to three J- connectors that either cable to or connect to, the I/O processors. The Mark VI system accommodates 24 inputs, the Mark VIe system accommodates 12 inputs.
THERMOCOUPLE LIMITS:
Thermocouple inputs support a full-scale input range of -8.0 mV to + 45.0 mV. The following table shows typical input voltages for different thermocouple types versus minimum and maximum temperature ranges. It is assumed the cold junction temperature ranges from -30 to 65°C (-22 to +149 °F). The CJ signals go into signal space and are available for monitoring. Normally the average of the two is used. Acceptable limits are configured, and if a CJ goes outside the limit, a logic signal is set. A 1 °F error in the CJ compensation will cause a 1°F error in the thermocouple reading.
WOC has the largest stock of OEM replacement parts for GE Distributed Control Systems. We can also repair your faulty boards and supply unused and rebuilt boards backed up with a warranty. Our team of experts is available round the clock to support your OEM needs. Our team of experts at WOC is happy to assist you with any of your automation requirements. For pricing and availability on parts and repairs, kindly contact our team by phone or email.
How does a thermocouple input terminal board work?
The board works by providing terminals for the connection of thermocouple leads. It typically includes screw terminals or similar connectors where the thermocouple wires are secured. The board then relays the temperature signals to the connected control system, which interprets the data and displays the temperature readings.
What types of thermocouples can be used with an input terminal board?
Most thermocouple input terminal boards are designed to be compatible with a wide range of thermocouple types, including Type J, K, T, E, N, R, S, and B. It is important to check the specifications of the terminal board to ensure compatibility with the thermocouple type you intend to use.
How many thermocouples can be connected to a single terminal board?
The number of thermocouples that can be connected to a single terminal board varies by model. Some boards may support as few as 8 channels, while others can support 32 channels or more. Check the specific terminal board's documentation for its channel capacity.
