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　　Product Description

　　The IS200VTURH2B is a PCB component manufactured by GE for the Mark VI system. The Mark VI is a steam/gas turbine management system created and released by General Electric as part of their ‘Speedtronic’ line. This was one of the last Speedtronic systems released by GE, and one of the most technologically advanced. The Mark VI includes fully programmable software maintenance tools available in the systems HMI (human-machine interface.)

　　As a Primary Turbine Protection board, the IS200VTURH2B has multiple functions, including monitoring shaft and voltage current, and (in gas turbine applications) monitoring Geiger-Mueller flame detectors. The board monitors four-speed inputs from passive magnetic sensors to maintain these functions. Flame detectors help determine if carbon buildup or other contaminants are reducing light detection within the system. This PCB can also issue a trip command in turbines that do not have a mechanical overspeed bolt.

　　The IS200VTURH2B is built with a double-wide faceplate. This faceplate has few components, but it does have three LED indicators and cable connectors. The faceplate connects to the front board edge via three screws.

　　The IS200VTURH2B has two backplane connectors plus other connectors. It has thirteen transistors, inductor coils, as well as resistors and capacitors on both the front and back of the board. The board includes an auxiliary board attached via four standoffs that has an additional backplane. The board has integrated circuits, including SRAM and RAM chips, oscillating chips, and FPGAs.https://www.axcontroler.com/

　　More information on the IS200VTURH2B board can be found in several GE publications, including Mark VI Control System Guides GER-4193A and GEH-6421.

　　Model number IS200VTCCH1CBB is one of the Mark VI boards produced by General Electric. This model is designated as a thermocouple input and can accept up to twenty-four thermocouple inputs. The inputs on this model can be wired to either the DTTC or TBTC terminal boards. The TBTC terminal board is the associated terminal board, while the DTTC board is the DIN Euro-size terminal board. Depending on the TBTC model used with the VTCC model, it can be used in two different groups. The TBTCH1C model allows for simplex control, while the TBTCH1B model allows for triple modular redundant (TMR) control. There are also two groups of the VTCC models; the IS200VTCCH1CBB model is part of the first group, which indicates that the model can be used with gas turbine control applications. No matter which group the VTCC model is used in, the same terminal boards will be used.

　　When the IS200VTCCH1CBB model is accepting thermocouple inputs, the types of inputs supported on the VTCCH1 model are E, J, K, S, and T thermocouples and mV inputs. The span of mV allowed on the VTCC model is -8 mV to +45 mV. The thermocouple inputs used with this model can be grounded or ungrounded and can be located up to nine-hundred and eighty-four feet from the associated turbine control cabinet. There are two cold junctions and high-frequency noise suppression devices mounted on the terminal board.

　　When the IS200VTCCH1CBB model is operated in a TMR system, if one of the signals on the device varies from the median/voted value by more than the predetermined limit, then the signal will be identified and cause a fault. For more information on fault indication and available diagnostic checks on the VTCC model, refer to GE Manual GEH-6421.

　　Frequently Asked Questions about IS200VTCCH1CBB

　　What is the IS200VTCCH1CBB model, and what are the functions of the unit?

　　The IS200VTCCH1CBB model is labeled as a thermocouple input board. It can accept up to twenty-four thermocouple inputs and work in either simplex or triple modular redundant systems depending on the attached TBCI board. The thermocouple inputs on the board can be grounded or ungrounded. A linearization feature on the board can be used with individual thermocouples; the linearization feature will be performed by the software used with the VTCC and Mark VI models. If any of the thermocouples are learned to be outside of the assigned hardware limits, the thermocouple will be removed from the scanned inputs to prevent unfavorable effects on other input channels.

　　What do the cold junctions on the IS200VTCCH1CBB model do?

　　There are two cold junctions on the IS200VTCCH1CBB model; these junctions and the thermocouple inputs work together to automatically calibrate the filtered calibration references and zero voltages. It must be noted that at all times, both cold junctions are used per each VTCC model, and there is one junction available for the J3 and J4 connectors on the front of the model. The two references can be selected to operate in a remote or local setting.

　　Reviews For IS200VTCCH1CBB

　　The IS200VTCCH1CBB model can be used in temperature ranges from 0 to 70 degrees Celsius or 32 to 158 degrees Fahrenheit; when the model is used in those temperature ranges, each of the thermocouples can work in the range of -8.0 mV to +45.0 mV. Each of the inputs has a dedicated mV at the highest and lowest temperatures. For these values, refer to the GEH-6421 Manual on page 390.

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