IS200TBCHIH2B - Contact Input Terminal Board

SPECIFICATIONS:

Part Number: IS200TBCHIH2B
Manufacturer: General Electric
Series: Mark VIe
Product Type: Contact Input Terminal Board
Voltage Range: 18 - 32 VDC
Mounting: DIN-rail mounting
Voltage Class: 5 kV
Channel Density: 24 Contact Voltage Input Channels
Excitation Voltage: 24 VDC Nominal
Input Filtering: 4 ms Hardware Filter
Power Consumption: 20.6 W
Technology: Surface mount
Operating temperature: -30 to 65°C
Size: 3.175 cm high x 12.7 cm wide
Repair: 3-7 days
Availability: In Stock
Country of Origin/Manufacturer: United States
Manual: GEH-6721_Vol_II

FUNCTIONAL DESCRIPTION OF IS200TBCHIH2B:

IS200TBCHIH2B is a Contact Input Terminal Board designed and manufactured by General Electric as part of the Mark VIe Series used in GE Distributed Turbine Control Systems. The TBCHIH2B terminal board works with the PDIA I/O pack and supports simplex, dual, and TMR configurations. It can accommodate one, two, or three PDIAs directly. For proper mechanical alignment of connector JT1 with the I/O pack's mechanical support, the Mark VIe control system requires the C version of this board. The power conversion cabinet contains the electronic components that make up the power converter. The power converter consists of a source bridge that feeds a load bridge through a DC link reactor. A transformer isolates the static starter from the AC system bus and provides the correct voltage at the rectifier terminals. The transformer’s internal impedance limits the magnitude of any downstream bus faults.

INSTALLATION:

To connect the 24 dry contact inputs, wire them directly to the two I/O terminal blocks on the terminal board. These blocks are secured with screws and can be unplugged for maintenance. Each block accommodates up to #12 AWG wires through its 24 terminals. A shield terminal strip for chassis ground is located to the left of each terminal block.

For a simplex system, connect the TBCH to the PDIA I/O pack using connector JR1. In a TMR system, connect the TBCH to the three PDIAs via connectors JR1, JS1, and JT1. The PDIAs plug into the TBCH and attach to side-mounting brackets. Additionally, one or two Ethernet cables should be connected to the I/O pack. Firmware updates may be necessary. Finally, connect the TBCH to the contact excitation voltage source using plugs JE1 and JE2.

OPERATION:

Discrete input voltage signals are transmitted to the PDIA I/O pack, which routes them through optical isolators. These isolators provide group isolation and transfer the signals to the Mark VIe controller. The reference voltage in the isolation circuits sets a transition threshold at 50% of the applied floating power supply voltage, with tracking clamped to no less than 13% of the nominal supply voltage to ensure all contacts indicate open if the voltage drops below this level. Each input has a pair of terminal points: one for the positive DC source and one for the return. The current loading is 2.5 mA per point for the first 21 inputs on each terminal board, with the last three supporting a 10 mA load for interfacing with remote solid-state output electronics.

LEG REACTORS AND CELL SNUBBERS:

The commutating reactors are located in the ac legs feeding the SCRs, and the snubbers are Resistance-Capacitance (RC) circuits that run between the anode and the cathode of each SCR. The snubber resistors, mounted on long heatsinks, are located behind the SCRs. The snubber capacitors are located beneath the SCRs. The cell snubbers, line filters, and line reactors together perform the following functions to prevent misoperation of the SCRs. The SCR snubbers include current-sharing resistors that help balance the current flowing in each SCR; they also provide a means to detect voltage across the SCR to aid in fault detection.

WHY BUY FROM WOC

World of Controls supports your General Electric Speedtronic infrastructure by providing the Contact Input Terminal Board in UNUSED surplus and precision-REBUILT conditions. Every board undergoes continuity mapping, 24-channel signal conditioning verification, and backplane load testing on active Mark VI simulator benches to ensure uninterrupted field performance. Backed by direct unit exchange options, priority repair turnarounds (3 to 7 business days), and full warranty coverage, our team helps to prevent costly turbine downtime. Contact our engineering team for live stock availability, technical support, or global delivery options.

FREQUENTLY ASKED QUESTIONS:

What is GE IS200TBCIH2B?

The GE IS200TBCIH2B is a Contact Input Terminal Board manufactured by General Electric for Speedtronic Mark VI turbine control systems. It connects up to 24 discrete field contact inputs to system processing cards.

How many field contact inputs can be wired to the board?

The board supports 24 dry contact input channels wired directly to two removable 24-terminal screw blocks. Each channel provides separate terminal points for positive DC supply and return wiring up to #12 AWG.

What are the current loading specifications across input channels?

The first 21 input channels present a current load of 2.5 mA per channel. The final three channels (inputs 22 through 24) support a 10 mA current load for compatibility with solid-state field output electronics.

How is the contact open/closed transition threshold established?

The isolation circuit reference voltage sets the input transition threshold at 50% of the applied floating supply voltage. Tracking is clamped to no less than 13% of the nominal voltage, forcing all channels to indicate open if the supply voltage drops below the threshold.

How are PDIA I/O packs mounted onto the TBCHIH2B board?

PDIA I/O packs plug directly into connectors JR1 (Simplex), JS1, and JT1 (TMR) on the terminal board and are secured to adjacent side-mounting brackets. Simplex systems populate connector JR1 only.