World Of Controls understands the criticality of your requirement and works towards reducing the lead time as much as possible.
IS200VTCCH1CBA - Thermocouple Processor Board is available in stock which ships the same day.
IS200VTCCH1CBA - Thermocouple Processor Board comes in UNUSED as well as REBUILT condition.
To avail our best deals for IS200VTCCH1CBA - Thermocouple Processor Board, contact us and we will get back to you within 24 hours.
SPECIFICATIONS:
Part Number: IS200VTCCH1CBA
Manufacturer: General Electric
Series: Mark VI
Function: Thermocouple Processor Board
Number of Channels: 24
Thermocouple Types: E, J, K, S
Span: -8 mV to +45 mV
A/D Converter: 16-bit
Common Mode Voltage: +5 Volts
Normal Mode Rejection: 250 mV
Microprocessor: AMD-K6 300 MHz
Operating temperature: -30 to 65 °C
Size: 8.26 cm wide x 4.19 cm
Technology: Surface Mount
Repair: 3-7 days
Availability: In Stock
Country of Origin: United States
FUNCTIONAL DESCRIPTION:
IS200VTCCH1CBA is a Thermocouple Processor Board manufactured and designed by General Electric as part of the Mark VI Series used in GE Speedtronic Control Systems. The thermocouple processor board VTCC accepts 24 type E, J, K, S (see note), or T thermocouple inputs. These inputs are wired to two terminal blocks on the terminal board TBTC. Cables with molded plugs connect the terminal board to the VME rack, where the VTCC thermocouple processor board is located. The TBTC can provide both simplex (TBTCH1C) or triple module redundant (TMR) control (TBTCHIB).
INSTALLATION:
Power down the VME processor rack before beginning the installation. Ensure that all power to the VME processor rack is turned off. This is a critical safety measure to prevent electrical shock, damage to the board, or disruption to other components in the system. Verify that all indicator lights are off and that there is no residual voltage present before proceeding.
Slide the VTCC board in and push the top and bottom levers in with your hands to seat its edge connectors. Carefully align the VTCC board with the guide rails of the designated slot in the VME rack. Gently slide the board into the slot until you feel resistance from the backplane connectors. At this point, use your hands to press the top and bottom levers inward to fully seat the board’s edge connectors into the VME backplane. This action ensures a firm and secure electrical connection between the board and the system bus. Do not use tools to push the levers, as this may cause physical damage to the board or connectors.
OPERATION:
The 24 thermocouple inputs on the TBTC can be grounded or ungrounded. They can be located up to 300 m (984 ft) from the turbine control cabinet with a maximum two-way cable resistance of 450 Ω. High-frequency noise suppression and two cold junction reference devices are mounted on the terminal board. Linearization for individual thermocouple types is performed in software by VTCC. A thermocouple that is determined to be out of the hardware limits is removed from the scanned inputs in order to prevent adverse effects on other input channels.
SIGNAL PROCESSING & LINEARIZATION
The board performs real-time linearization of thermocouple signals (Types E, J, K, S, and T) through onboard software. This digital signal processing allows the module to handle both grounded and ungrounded thermocouples located up to 984 feet (300 meters) from the control cabinet. To protect the integrity of the control database, the VTCC diagnostic engine continuously monitors for hardware limits; any channel that falls outside the specified mV range is automatically removed from the scan to prevent faulty data from propagating through the VME backplane to the VCMI and main controller.
COLD JUNCTIONS
If both cold junction devices are within the configurable limits, then the average of the two is used for cold junction compensation. If only one cold junction device is within the configurable limits, then that cold junction is used for compensation. If neither cold junction device is within the configurable limits, then a default value is used.
The thermocouple inputs and cold junction inputs are automatically calibrated using the filtered calibration reference and zero voltages. There are two cold junction references used per VTCC, one for connectors J3 and J4. Each reference can be selected as either remote (from VME bus) or local (from associated terminal board, T-type or D-type). All references are then treated as sensor inputs (for example, averaged, limits configured). The two references can be mixed, one local and one remote. Cold junction 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 cold junction goes outside the limit, a logic signal is set.
World of Controls (WOC) is a leading provider of mission-critical GE Mark VI components. We offer the IS200VTCCH1CBA in both UNUSED and REBUILT conditions, ensuring that even legacy turbine assets can be maintained with high-reliability hardware. Each board undergoes rigorous functional testing, including 16-bit A/D conversion accuracy checks and Cold Junction compensation verification. With 24/7 technical support and rapid global shipping, WOC is your trusted partner for minimizing downtime in power generation and industrial environments.
What is the IS200VTCCH1CBA?
The IS200VTCCH1CBA is a Thermocouple Input Processor Board (VTCC) for the GE Mark VI series. It handles 24 channels of temperature sensing, supporting standard thermocouple types (E, J, K, S, T) and converting their millivolt signals into digital temperature data for turbine control loops.
What is the difference between the VTCCH1 and VTCCH2?
The VTCCH1 (which includes the IS200VTCCH1CBA) is optimized for gas turbine control with a span of -8 mV to +45 mV. VTCCH2 is intended for general-purpose applications, supporting a wider range of thermocouples (B, N, R) and an expanded span of -20 mV to +95 mV.
How does Cold Junction (CJ) compensation voting work in TMR systems?
In Triple Modular Redundant (TMR) configurations, signals are fanned to three VTCC boards (R, S, and T). The boards independently read the two CJ sensors on the terminal board. If one CJ sensor fails, the boards vote to use the remaining healthy sensor. If both fail, a pre-set default value is used to maintain system stability while flagging a diagnostic alarm.
Why is the 16-bit A/D resolution critical for combustion monitoring?
The 16-bit resolution allows the board to divide its -8 mV to +45 mV span into over 65,000 steps. For a Type K thermocouple, this provides a resolution of approximately 0.1°F (0.05°C). This precision is necessary for the Mark VI combustion monitor to detect minute temperature variances between burners, which are early indicators of fuel nozzle plugging or combustion instability.
