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SPECIFICATIONS:
Part Number: IS200TBTCH1CBB
Manufacturer: General Electric
Series: Mark VIe
Product Type: Thermocouple Input Terminal Board
Number of channels: 24 channels
Thermocouple types: E, J, K, S, T
Span: -8 mV to +45 mV
Operating temperature: 0 to +45°C
Size: 15.9 cm high x 17.8 cm
Repair: 3-7 Days
Availability: In Stock
Country of Origin: United States
Manual: GEH-6421M
FUNCTIONAL DESCRIPTION:
IS200TBTCH1CBB is a 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 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:
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 TBTCH1,B one, two, or three PTCC packs plug in, supporting a variety of system configurations, but only 12 inputs are available.
INSTALLATION:
OPERATION:
The system supports 24 thermocouple inputs, which can be either grounded or ungrounded. These thermocouples may be installed up to 300 meters (984 feet) from the turbine control panel, with a maximum allowable two-way cable resistance of 450 ohms. To enhance signal quality, the TBTC terminal board includes high-frequency noise suppression and two cold junction reference devices, as illustrated in the accompanying figure.
Analog-to-digital conversion and thermocouple linearization are handled within the I/O processor, ensuring accurate temperature measurements specific to each thermocouple type.
In Mark VI systems using the TBTCH1C terminal board, a single VTCC module is used to process all 24 thermocouple inputs. For Mark VIe systems, two PTCC I/O packs are plugged into the TBTC terminal board to acquire the same number of inputs.
For Triple Modular Redundant (TMR) configurations using the TBTCH1B board, thermocouple signals are distributed to three J-type connectors. These connectors either cable to or directly connect with three separate I/O processors, depending on the design. In this setup, the Mark VIe system handles 12 thermocouple inputs per processor, maintaining redundancy, while the Mark VI continues to support 24 inputs in total.
THERMOCOUPLE LIMITS:
The thermocouple inputs are designed to support a full-scale input range from -8.0 mV to +45.0 mV, making them versatile for measuring a wide variety of temperatures. The voltage output from the thermocouple is proportional to the temperature difference between the measurement point and the cold junction, which is referenced at a temperature range between -30°C and 65°C (-22°F to +149°F). The following table provides typical input voltages for various thermocouple types, corresponding to their minimum and maximum temperature ranges:
COLD JUNCTIONS:
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. Hard-coded limits are set at -40 to 85°C (-40 to +185 oF), and if a CJ goes outside these, it is regarded as faulted. Most CJ failures are open or short circuit. If the CJ is declared faulty, the backup value is used, which can be derived from CJ readings on other terminal boards or can be the configured default value.
WOC offers the largest inventory of OEM replacement parts for GE Distributed Turbine Control Systems. In addition to providing high-quality replacement parts, we also offer repair services for faulty boards and supply both unused and refurbished boards, all backed by a warranty for your peace of mind. Our team of experts is available 24/7 to assist with your OEM needs, ensuring you receive prompt and reliable support for your automation systems. For information on pricing, availability or to discuss repairs, please don't hesitate to contact our team by phone or email. We’re here to help with all your automation requirements.
What is a Thermocouple Input Terminal Board?
A Thermocouple Input Terminal Board is a component used to interface thermocouples with control systems. It serves as the connection point for thermocouple wires, providing both electrical connections and cold junction compensation for accurate temperature measurement. These terminal boards typically include features for noise suppression, proper grounding, and support for a variety of thermocouple types.
How many thermocouples can the terminal board support?
Most thermocouple input terminal boards are designed to support 24 thermocouple inputs, with some systems offering configurations to support more or fewer based on system requirements. The number of inputs can vary depending on the type of control system and redundancy levels (such as TMR or simplex systems).
What is the input voltage range for the thermocouple terminal board?
The typical input voltage range for thermocouple inputs is from -8.0 mV to +45.0 mV, depending on the thermocouple type used. The voltage output from the thermocouple is directly proportional to the temperature difference between the measurement point and the cold junction.
