IS200TBCIH4C - Contact Input Group Isolation Terminal Board

SPECIFICATIONS:

Part Number: IS200TBCIH4C
Manufacturer: General Electric
Series: Mark VIe
Product Type: Contact Input Group Isolation Terminal Board
Number of channels: 24
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 17.8 cm
Repair: 3-7 Day
Availability: In Stock
Country of Origin: United States

FUNCTIONAL DESCRIPTION:

IS200TBCIH4C is a Contact Input 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 Vle control requires the C version of this board for correct mechanical alignment of connector JTI 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_IC are powered from a floating 125 V de (100-145 V dc) supply from the turbine control. The 125 V de bus is currently limited in the power distribution module before feeding each contact input. The H2, H3, and H4 versions use lower voltages.

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 is 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.

DIAGNOSTICS:

• The excitation voltage is monitored. If the excitation drops to below 40% of the nominal voltage, a diagnostic alarm is set and latched by the PDIA.

• As a test, all inputs associated with this terminal board are forced to the open contact (fail-safe) state. Any input that fails the diagnostic test is forced to the fail-safe state and a fault is created.

• If the input from this board does not match the TMR voted value from all three boards, a fault is created.

• Each terminal board connector has its own ID device that is interrogated by the PDIA. The connector ID is coded into a read-only chip containing the board serial number, board type, revision number, and the JRI/JS1/JT1 connector location. When the chip is read by the PDIA and a mismatch is encountered, a hardware incompatibility fault is created.

WOC has the largest stock of OEM Replacement Parts for GE Distributed Turbine Control Systems. We can also repair your faulty boards and supply unused and rebuilt boards backed up with a warranty. Our team of experts is available round the clock to support your OEM needs. Our team of experts at WOC is happy to assist you with any of your automation requirements. For pricing and availability on parts and repairs, kindly contact our team by phone or email.

FREQUENTLY ASKED QUESTIONS:

How is the input current load handled on the terminal board?

The current load for the first 21 inputs on the terminal board is 2.5 mA per point, while the last 3 inputs require a 10 mA load to interface with remote solid-state output electronics.

What is the excitation voltage required for operation?

The excitation voltage for the contact inputs is provided by a floating 125 V dc (100-145 V dc) supply from the turbine control. If this voltage drops below 40% of the nominal value, it triggers a diagnostic alarm.

How does the terminal board handle input signal isolation?

The terminal board uses optical isolators to provide group isolation for the contact input signals. These isolators separate the signals to prevent electrical interference and ensure the signals are clean before being sent to the Mark VIe controller.