Installation, Operation, and Jumper Configuration
The board accepts 14 sensor inputs, which are directly connected to two 24-point I/O terminal blocks. Each block is held together by two screws that accept wires up to 12 AWG.
Each terminal block has its own shield termination attachment point. Only 13 of the 14 channels can be processed by the I/O pack. The 14th channel is routed to the buffered output stage, where it is used by Bently Nevada equipment (with TVBAH2A, H2B, S2A, or S2B)
Installation
The installation process for the TVBA (Transducer Voltage Bias Assembly) involves various components and connections to ensure the system functions correctly. Here's an in-depth explanation of the installation procedure:
Sensor Inputs:
The TVBA accepts a total of 14 sensor inputs.
These sensor inputs are wired directly to two I/O terminal blocks, with each block securely fastened using two screws.
Each terminal block is equipped with 24 terminals designed to accept wires as large as #12 AWG, ensuring the capacity to handle a variety of wire sizes.
Adjacent to each terminal block, a shield termination attachment point is provided.This point plays a crucial role in grounding and electromagnetic shielding, maintaining signal integrity
Input Channels 1-8:
These channels support various sensors, including Proximitors, Seismics, Accelerometers (only in channels 1, 2, and 3), and Velomitors.
A current-limited -24V power supply is allocated per channel, ensuring that sensor components receive stable power.
JPxA jumpers are available for configuring open circuit checks and providing a constant 3mA current feed for Velomitors.
JPxB configurations are available to set the JA1 and JB1 outputs for compatibility with the Bently Nevada 3500 rack.
JPxC configurations enable PR0xL to be set as Open for true differential input or connected to PCOM for a -24V return
Input Channels 9-12:
These channels exclusively support Proximitors sensors.
Each channel is equipped with a current-limited -24V power supply.
No jumper configuration is required for these channels
Input Channel 13:
Channel 13 supports Proximitors or Keyphasor proximity sensors.
Similar to other channels, it features a current-limited -24V power supply,
No jumper configurations are necessary for this channel.
-28V Power Supply Board (WNPS):
The WNPS board plays a vital role in the installation, converting the +28V power supply from the PVIB (Proximitor/Velomitor Interface Board) to the -28V power
required by the current-limited -24V outputs.
There is one WNPS board allocated per PVIB.
Each WNPS board is equipped with independent +28V inputs and a common -28V bus shared among all three WNPS boards.