IS200TBTCH1BAA - Thermocouple Terminal Board

SPECIFICATIONS:

Part Number: IS200TBTCH1BAA
Manufacturer: General Electric
Series: Mark VIe
Product Type: Thermocouple 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 Deg C
Size: 15.9 cm high x 17.8 cm
Repair: 3-7 Days
Availability: In Stock
Country of Origin: United States
Manual: GEH-6721D

FUNCTIONAL DESCRIPTION:

IS200TBTCH1BAA is a Thermocouple Terminal Board manufactured and designed by General Electric as part of the Mark VIe Series used in GE Distributed Turbine Control Systems. The Thermocouple (TBTCH1BAA) terminal board accepts 24-type E, J, K, S, or T thermocouple inputs. It accepts additional B, N, and R types of thermocouple inputs only when used with PTCCH2 in Mark VIe. These inputs are wired to two barrier-type blocks on the terminal board. TBTCH1BAA communicates with the I/O processor through DC-type connectors. Two types of TBTCH1BAA are available, as follows:

• TBTCH1C for simplex applications has two DC-type connectors.
• TBTCH1B for TMR applications has six DC-type connectors.

In the Mark VI system, TBTC works with the VTCC processor and supports simplex and TMR applications. One TBTCH1C connects to the VTCC with two cables. In TMR systems, TBTCH1B connects to three VTCC boards with six cables.

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 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, as shown in the figure below. The analog-to-digital conversion is in the I/O processor, and the linearization is 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 onto 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:

The thermocouple inputs of this device are designed to measure temperatures by interpreting the voltage generated across the thermocouple junctions. The inputs support a full-scale input voltage range of -8.0 mV to +45.0 mV, which corresponds to the typical output range of most standard thermocouples. The table below (not included here) provides typical input voltages for various thermocouple types, along with their associated minimum and maximum measurable temperatures. These voltage-to-temperature relationships are based on standard thermocouple characteristics. It is assumed that the cold junction temperature, also known as the reference junction temperature, is within the range of -30�C to 65�C (-22�F to 149�F). The accuracy of thermocouple measurements depends on the cold junction compensation, so deviations outside this range may affect the readings.

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, and if a CJ goes outside these, it is regarded as faulted. Most CJ failures are open or short circuits.

World of Controls (WOC) offers the largest inventory of GE Distributed Control System (DCS) replacement parts, ensuring that you can quickly source the components you need to keep your operations running smoothly. In addition to supplying both unused and professionally rebuilt parts backed by a warranty, we also provide expert repair services for faulty boards, restoring them to full functionality. Our dedicated team of automation specialists is available 24/7 to support all your OEM requirements and provide guidance on part selection, repairs, and system solutions. For detailed information on pricing, availability, or repair services, our team is ready to assist you promptly via phone or email, ensuring minimal downtime for your critical processes.

FREQUENTLY ASKED QUESTIONS:

What is the IS200TBTCH1BAA?

The IS200TBTCH1BAA is a thermocouple terminal board manufactured by General Electric as part of the Mark VIe series. It is designed to accept 24 thermocouple inputs (types E, J, K, S, and T) and interfaces with the Mark VIe Distributed Turbine Control Systems (DCS) for accurate temperature monitoring and control.

How many thermocouple channels does it support?

This terminal board supports 24 thermocouple channels. For additional thermocouple types like B, N, and R, it can be used with the PTCCH2 module in Mark VIe systems.

What are the thermocouple input limits?

The thermocouple inputs support a full-scale voltage range of -8 mV to +45 mV, which covers the standard output range of most thermocouples. Cold junction compensation is factored in, with a normal operating reference junction range of -30 Deg C to 65 Deg C (-22 Deg F to 149 Deg F). Exceeding these limits may affect measurement accuracy.

How does the board communicate with the DCS?

The terminal board communicates with the I/O processor through DC-type connectors. For simplex systems, TBTCH1C uses two connectors, and for TMR (Triple Modular Redundant) systems, TBTCH1B uses six connectors.