IS230TBCIH3C - Contact Input with Group Isolation Terminal Board

SPECIFICATIONS:

Part Number: IS230TBCIH3C
Manufacturer: General Electric
Series: Mark VI
Product Type: Contact Input with Group Isolation Terminal Board
Number of channels: 24
Excitation Voltage: 125 V dc
Power Consumption: 20.6 W
Power supply voltage: 28 V dc
Voltage Range: 14 to 32 V dc
Mounting: DIN-rail mounting
Technology: Surface mount
Operating temperature: -30 to 65°C
Size: 33.02 cm high x 10.16 cm
Repair: 3-7 Day
Availability: In Stock
Country of Origin: United States
Manual: GEH-6721_Vol_II

FUNCTIONAL DESCRIPTION:

IS230TBCIH3C is a Contact Input with a Group Isolation Terminal Board manufactured and designed by General Electric as part of the Mark VI Series used in GE Speedtronic Gas Turbine Control Systems. The Contact Input with Group Isolation (TBCI) terminal board accepts 24 dry contact inputs wired to two barrier-type terminal blocks. For contact excitation, DC power is wired to TBCI. The contact inputs have noise suppression circuitry to protect against surge and high-frequency noise. The TBCI works with the PDIA I/O pack and supports simplex, dual, and TMR applications. One, two, or three PDIAS can be plugged directly into the TBCI. The Mark VIe control requires the C version of this board for the correct mechanical alignment of connector JT1 to the I/O pack mechanical support.

INSTALLATION:

Connect the wires for the 24 dry contact inputs directly to two I/O terminal blocks on the terminal board. These blocks are held down with two screws and can be unplugged from the board for maintenance. Each block has 24 terminals accepting up to #12 AWG wires. A shield terminal strip attached to the chassis ground is located immediately to the left of each terminal block.

In a simplex system, connect the TBCI to the PDIA I/O pack using connector JR1. In a TMR system, connect TBCI to the three PDIAS using connectors JR1, JS1, and JT1. The PDIAS plug into TBCI and attach to side-mounting brackets. One or two Ethernet cables plug into the I/O pack. Firmware may need to be downloaded. Connect TBCI to the contact excitation voltage source using plugs JE1 and JE2.

OPERATION:

• Filters reduce high-frequency noise and suppress surge on each input near the point of signal entry. The dry contact inputs on TBCI_1C are powered from a floating 125 V dc (100-145 V dc) supply from the turbine control. The 125 V DC bus is currently limited in the power distribution module before feeding each contact input.

• The discrete input voltage signals pass to the PDIA I/O pack, which sends them through optical isolators providing group isolation and transfers the signals to the Mark VIe controller.

• The reference voltage in the isolation circuits sets a transition threshold that is equal to 50% of the applied floating power supply voltage. The tracking is clamped to go no less than 13% of the nominal rated supply voltage to force all contacts to indicate open when the voltage dips below this level.

• A pair of terminal points are provided for each input, with one point (screw) providing the positive de-source and the second point providing the return (input) to the board. The current loading is 2.5 mA per point for the first 21 inputs on each terminal board. The last three have a 10 mA load to support the interface with remote solid-state output electronics. Contact input circuitry is designed for NEMA Class G creepage and clearance.

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FREQUENTLY ASKED QUESTIONS:

What is a contact input terminal board?

A contact input terminal board is a device used to interface external devices or sensors with a control system. It typically consists of terminal blocks where wires from external devices can be connected.

What is group isolation in a terminal board?

Group isolation refers to the ability to isolate or disconnect groups of terminals from each other. This feature is useful for troubleshooting, maintenance, or safety purposes, allowing specific groups of inputs to be isolated without affecting others.

What types of applications commonly use contact input terminal boards with group isolation?

Contact input terminal boards with group isolation are commonly used in industrial automation, building management systems, security systems, and other applications where multiple external devices need to be connected to a central control system while maintaining isolation and organization.