Overview
Configured for four-channel proximity transducer signal interfacing in the 3500 Series Machinery Protection System, the Bently Nevada 143488-01 (3500/40 Proximitor I/O Module) provides the physical and electrical interface between field transducers and the 3500/40M Proximitor Monitor. The module uses internal terminations and supports vibration and position measurements through compatible Bently Nevada proximity transducers.
Hardware Specifications
| Parameter | Specification |
|---|---|
| Model | 3500/40 |
| Part Number / Catalog Number | 143488-01 |
| Brand | Bently Nevada |
| Manufacturer | Bently Nevada, Baker Hughes |
| Product Series | 3500 Series Machinery Protection System |
| Module Type | Proximitor I/O Module with Internal Terminations |
| Number of Channels | 4 channels |
| Compatibility | 3500/40M Proximitor Monitor |
| Inputs | Up to 4 Bently Nevada proximity transducers |
| Transducer Power Supply | -24 VDC nominal |
| Input Impedance | 10 kOhm, standard I/O |
| Supported Measurements | Radial vibration, thrust position, differential expansion, eccentricity, REBAM |
| Outputs | Buffered transducer outputs through front-panel coaxial connectors |
| Output Impedance | Approximately 550 Ohm |
| Output Protection | Short-circuit protected |
| Operating Temp | -30 deg C to +65 deg C |
| Storage Temp | -40 deg C to +85 deg C |
| Relative Humidity | Up to 95%, non-condensing |
Eddy-Current Probe Signal Interface
The 143488-01 interfaces Bently Nevada eddy-current proximity transducers with the 3500/40M monitoring electronics. Each channel receives the transducer signal and provides the electrical interface required for machinery vibration or position measurement.
The -24 VDC nominal transducer supply supports the connected proximity sensing circuit. During commissioning, technicians should verify the probe gap voltage against the applicable Bently Nevada transducer and monitor configuration. A nominal -10 VDC gap target commonly serves as a field reference for compatible Bently Nevada proximity probe systems; however, the exact acceptance range must follow the installed probe and system documentation.
The module also provides buffered transducer outputs through front-panel coaxial connectors. These outputs allow technicians to access the conditioned transducer signal while maintaining the monitor channel connection.
Frequently Asked Questions (FAQ)
Q: How many proximity transducer channels does the 143488-01 support?
A: The module provides 4 channels and accepts signals from up to 4 compatible Bently Nevada proximity transducers.
Q: Does the 143488-01 provide transducer power?
A: Yes. The supplied data specifies a nominal -24 VDC transducer power supply for the connected sensing circuits.
Q: What should technicians verify before commissioning an eddy-current probe channel?
A: Technicians should verify wiring, polarity, shielding, probe gap, and the resulting gap voltage against the applicable Bently Nevada system documentation.
Field Installation Guidelines
- Install the 143488-01 in the designated 3500 Series rack position for the applicable I/O and monitor configuration.
- Confirm that the installed module matches the configured 3500/40M Proximitor Monitor channel requirements before connecting field wiring.
- Connect each proximity transducer to its assigned channel and maintain the specified signal polarity.
- Route probe cables separately from high-current power conductors and switching circuits where practical. This reduces electromagnetic interference and unwanted signal coupling.
- Terminate cable shields according to the approved 3500 system wiring documentation. Avoid creating unintended shield current paths through multiple grounding points.
- Inspect coaxial connections for correct mating and mechanical retention before energizing the system.
- Verify the -24 VDC transducer supply and probe gap voltage during commissioning. For eddy-current systems, compare measured values with the applicable probe and monitor specifications.
- Confirm channel scaling and measurement configuration before placing machinery protection functions into service.
- Do not apply unspecified external power or signal connections to the I/O terminals. Follow the applicable Bently Nevada installation and wiring documentation.
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