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Bently Nevada 125680-01 4-Channel Proximitor Internal Termination I/O Module

The Bently Nevada 125680-01acts as the primary hardware interface link mounted on the rear bulkhead of the 3500 machinery protection rack. It is purpose-built to pair with the 3500/40 and upgraded 3500/40M Proximitor Monitors.The module processes non-contacting eddy current proximity probe voltage inputs, converting gap movements into critical machine health metrics including radial shaft vibration, axial thrust position, eccentricity, differential expansion, and high-frequency REBAM rolling element bearing diagnostics.

The core advantage of the 125680-01 PWA is its independent Internal Termination layout. Heavy-duty, high-retention Euro-style screw terminals are integrated directly onto the back faceplate of the board. Field technicians can bring multi-conductor field cables straight into the rack housing, terminating signal (+), power (-24 Vdc supply), and common (COM) connections per channel alongside isolated shield ground points. This makes it an ideal, self-contained solution for standard field enclosures where space optimization and direct wire management are paramount.

• Point-to-Point Termination Efficiency: Features built-in screw terminal blocks directly on the module backplate, completely bypassing the need for separate external terminal blocks or marshalling accessories.

• Dedicated Shield Isolation: Provides individual, ground-isolated shield termination points for each of the 4 channels, ensuring optimal noise rejection and signal grounding.

• Short-Circuit Protected Outputs: Built-in current limiting circuitry prevents a field sensor short or wiring fault from damaging the 3500 rack's internal power distribution network.

• Pure Dynamic Throughput: Routes raw sensor waveforms directly across the system backplane to ensure uncompromised data fidelity for downstream orbit, cascade, and spectrum diagnostics.

• Rugged Mechanical Retaining: Equipped with durable board-retaining screws that lock the card securely into the chassis frame, resisting industrial machine-deck vibration profiles.

• Standard Industrial Machinery Cabinets: The default choice for localized control enclosures where field instrumentation wires land directly in the primary monitoring rack cabinet.

• Steam Turbine Bearing Vibration Monitoring: Direct landing point for proximity probes tracking radial shaft dynamics across steam turbine generator sets.

• Centrifugal Gas Compressor Protection: Captures axial thrust and radial vibration trends to protect critical high-speed compressor stages.

• Balance of Plant (BOP) Fan Protection: Direct terminal interface for accelerometers or Velomitors tracking mechanical housing stress on forced-draft fans or cooling tower assemblies.

Q1: Can I use the 125680-01 I/O module with seismic sensors like accelerometers or velocity probes?

A: No. The 125680-01 is explicitly designed to interface with Bently Nevada proximity transducer systems (such as the 3300 XL series). For seismic or casing vibration sensors, you should use the 3500/42M monitor paired with its corresponding I/O modules, like the 128229-01.

Q2: What is the primary operational difference between the 125680-01 and external termination variants?

A: The 125680-01 features built-in screw terminals for direct, localized wire landings. External termination variants use a high-density multi-pin connector to bridge out to a separate terminal block located elsewhere in a marshalling panel via a pre-fabricated multi-core cable.

Q3: Is the transducer power supply provided by the 125680-01 card protected against field shorts?

A: Yes. Every channel's -24 Vdc output includes independent short-circuit protection. A short-to-ground event at a single proximity probe will lock out power to that specific sensor loop without dropping the entire card or affecting adjacent channels.

Q4: Do I need to reconfigure the 125680-01 hardware when upgrading from a 3500/40 card to a 3500/40M card?

A: No hardware modification is necessary. The 125680-01 acts as a pass-through connection interface. Any software or configuration changes required for the 3500/40M upgrade are handled entirely within the front-plane monitor card using the 3500 Rack Configuration Software.

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