IS230TVBAH6A - Vibration Input Terminal Board

IS230TVBAH6A - Vibration Input Terminal Board IS230TVBAH6A - Vibration Input Terminal Board

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Part Number: IS230TVBAH6A
Manufacturer: General Electric
Series: Mark VIe
Function: Vibration Input terminal board
N28 voltage: 28 normal
N28 ripple: 280 mV pk
N28 maximum current: 400 mA
Availability: In Stock
Product Type: PCB
Country of Manufacture: United States (USA)

Functional Description

IS230TVBAH6A is a Vibration Input terminal board manufactured by General Electric. It is a part of the Mark VIe Control System. The Vibration Input terminal board serves as a crucial signal interface board specifically designed for the Mark VIe I/O pack PVIB. Within the Mark VI system, it works in conjunction with the VVIB board. Its primary function is to establish a direct interface between the Mark VIe system and various types of probes, including seismic (velocity), Proximitors, Velomitors, and accelerometer-based probes.


  • One of the key features is its ability to provide signal suppression and electromagnetic interface (EMI) protection for each input signal. This ensures that the signals received by the terminal board remain free from unwanted noise and disturbances. Additionally, the signals are connected to a pull-up bias, allowing for open circuit detection.
  • To transmit the processed signals to the Mark VIe I/O packs, the TVBA employs a 37-pin connector. This connector acts as a pathway for the signals to reach the appropriate destination. In applications requiring Triple Modular Redundancy (TMR), the TVBA can be utilized, fanning the signal to three I/O packs to ensure redundancy and system reliability.
  • Moreover, it is equipped with buffered outputs that extend beyond the standard 37-pin connection. These additional connectors enable to interface with the Bently Nevada* 3500 monitoring system, utilizing special 9-pin and 25-pin connectors. The inclusion of a bayonet nut connection (BNC) for each channel further facilitates integration with third-party monitoring equipment.
  • In contrast to earlier systems, the Mark VIe systems do not rely on the conventional RKPS power supply. Instead, the product draws power from +28 V power supplies, eliminating the need for an external -28 V power source. To maintain compatibility and functionality with the system, the TVBA incorporates three removable daughterboards known as WNPS (negative power supply). These daughterboards play a critical role in converting the available +28 V power into the necessary -28 V power, which is utilized for its operations and functions.


  • The TVBA is designed to accept a total of 14 sensor inputs, which are directly wired to two I/O terminal blocks. Each terminal block is secured in place with two screws and provides 24 terminals capable of accommodating wires up to #12 AWG. Adjacent to each terminal block, there is a shield termination attachment point to ensure proper grounding.
  • Channels 1 through 8 support various types of sensors, including Proximitors, Seismics, Accelerometers (limited to channels 1, 2, and 3), and Velomitors. Each channel is equipped with a current-limited -24 V power supply to provide the necessary power to the connected sensors. The JPxA jumper allows for configuration of the open circuit check support and provides a constant current feed of 3 mA specifically for Velomitors. The JPxB configuration determines the outputs JA1 and JB1 for compatibility with the Bently Nevada 3500 rack. Lastly, the JPxC configuration allows for PR0xL to be set as open for true differential input or connected to PCOM for a -24 V return.
  • Channels 9 through 12 are dedicated to supporting Proximitors sensors exclusively. Similar to the previous channels, each channel has a current-limited -24 V power supply. No jumper configuration is required for these channels.
  • Input Channel 13 is designed to support either Proximitors or Keyphasor proximity sensors. It also features a current-limited -24 V power supply. No jumper configurations are needed for this channel.
  • To provide the required -28 V power for the current-limited -24 V outputs, the module incorporates the -28 V power supply board, WNPS. This board is responsible for converting the available +28 V power from the PVIB to the -28 V power utilized by the current-limited -24 V outputs. Each PVIB unit is equipped with one WNPS board. The WNPS boards feature independent +28 V inputs and a common -28 V bus that is shared among all three WNPS boards. This arrangement ensures proper power distribution and operation of the TVBA's functionalities.


  • Eight Vibration or Position (Circuits 1 through 8):  These circuits are designed to accommodate sensors that measure vibration or position. The TVBA provides the necessary interface and signal processing for these sensors. Various types of sensors, such as Proximitors, Seismics, Accelerometers (limited to circuits 1, 2, and 3), and Velomitors, can be connected to these channels. Each channel is equipped with a current-limited -24 V power supply to ensure proper operation of the connected sensors. The component offers configurable options through jumpers (JPxA, JPxB, and JPxC) to customize the functionality of these circuits based on the specific sensor requirements.
  • Four Position Only (Circuits 9 through 12): These circuits are dedicated to supporting sensors that measure position only. Specifically, Proximitors sensors can be connected to these channels. Similar to the previous circuits, each channel provides a current-limited -24 V power supply to the connected sensors. No jumper configuration is necessary for these circuits, as they are designed specifically for Proximitors sensors.
  • One Reference Probe (Keyphasor) or Position (Circuit 13): Circuit 13 of the TVBA is designed to accommodate either a Reference Probe (Keyphasor) or a position sensor. The TVBA provides the required signal processing and power supply (-24 V, current-limited) for the connected sensor. No jumper configurations are needed for this circuit, allowing flexibility in choosing between a Reference Probe or a position sensor based on the specific application requirements.
  • One Reference Probe (Keyphasor) or Position (Circuit 14): Similar to Circuit 13, Circuit 14 is also dedicated to accommodating either a Reference Probe (Keyphasor) or a position sensor. it ensures proper signal interface and processing for the connected sensor. This circuit also benefits from a current-limited -24 V power supply to meet the power requirements of the sensor. The flexibility provided by the TVBA allows users to select either a Reference Probe or a position sensor for this circuit, depending on the specific needs of the application.

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What is IS230TVBAH6A?
It is a Vibration Input terminal board manufactured and designed by General Electric

How does the component provide signal suppression and EMI protection?
The module incorporates features that suppress unwanted noise and disturbances in the input signals, ensuring signal quality. It also includes EMI protection measures to shield the signals from electromagnetic interference.

What is the purpose of the pull-up bias?
The pull-up bias allows for open circuit detection in the input signals. It helps identify if there is an open circuit in the signal path, which can indicate a fault or failure in the connected sensors.

How does the product achieve redundancy in TMR applications?
In TMR applications, the TVBA duplicates the signal and sends it to three I/O packs. This redundancy ensures that even if one I/O pack fails, the system can continue to receive and process the signals from the remaining packs, improving system reliability.