Bently Nevada 176449-01+125680-01 3500/40M Proximitor Monitor and I/O Module

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Manufacturer: Bently Nevada
Product No.: 176449-01+125680-01
Country of origin:United States
Product Type: Vibration Monitoring Modules
Payment: T/T, Western Union
Weight: 320g
Shipping port: Xiamen
Warranty: 12 months

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Description

Executing continuous machinery protection functions within the 3500 rack system, the Bently Nevada 176449-01+125680-01 pairs a four-channel 3500/40M Proximitor Monitor with a 125680-01 internal termination I/O module. This combination processes high-frequency inputs from proximity transducers to provide precise measurements of radial vibration, thrust position, eccentricity, and differential expansion. By embedding terminal connections directly onto the 125680-01 I/O card, the assembly eliminates the need for external terminal blocks, reducing cabinet footprint and simplifying complex field wiring in demanding environments.

Features

Four-Channel Architecture: Independent channel configuration supports simultaneous tracking of radial vibration, axial thrust, and shaft position.
Internal Terminations: The 125680-01 backplane card incorporates dedicated termination blocks directly on the module, streamlining loop wiring.
On-Board Signal Conditioning: Integrates high-accuracy analog-to-digital conversion and dynamic signal processing to calculate peak-to-peak and average values.
Flexible Alarm Profiles: Independent configuration of Alert and Danger thresholds for each channel with selectable time delays.
Comprehensive System Diagnostics: Continuous monitoring of transducer circuits, power supplies, and internal operations to trigger instant OK relay status transitions.

Applications

Steam and gas turbine bearing housing vibration and rotor position monitoring.
High-pressure centrifugal compressor rotor dynamic analysis.
Industrial gearbox, blower, and heavy-duty fan vibration tracking.
Critical rotating machinery protection in oil and gas, power generation, and petrochemical processing.

Technical Specifications

Parameter	Specification Value
Manufacturer	Bently Nevada
Monitor Module Part Number	176449-01 (3500/40M)
I/O Module Part Number	125680-01 (Internal Terminations)
System Compatibility	Bently Nevada 3500 Monitoring System
Number of Channels	4 independent channels
Input Transducer Support	Proximitor Transducers (including 3300 XL series)
Signal Range	-24 VDC nominal loop supply; standard proximity probe outputs
Termination Type	Internal Terminal Strips (Screw-clamp)
Operating Temperature	-30 to +65 degC
Country of Origin	United States of America (USA)
Shipping Weight	10.0 kg (including packaging and modules)

Connections and Interfaces

Terminal Block Label	Signal Assignment / Function
Ch 1 PROX / COM / SIG	Channel 1 Transducer Power, Ground, and Signal Return
Ch 2 PROX / COM / SIG	Channel 2 Transducer Power, Ground, and Signal Return
Ch 3 PROX / COM / SIG	Channel 3 Transducer Power, Ground, and Signal Return
Ch 4 PROX / COM / SIG	Channel 4 Transducer Power, Ground, and Signal Return
SHLD Terminals	Common instrumentation shield ground points (isolated from chassis)

Alternative Models & Compatibility

The 125680-01 I/O module utilizes screw-type internal terminals, making it mechanically incompatible with racks configured for external termination blocks (which utilize different cable assemblies and the 125680-02 external termination I/O). When hot-swapping or replacing older 3500/40 units, ensure the firmware revision of the 176449-01 matches the version programmed in your 3500 Rack Configuration software to prevent slot mismatch errors and module inhibit states.

Application Pitfalls & Engineering Notes

Because internal termination cables attach directly to the 125680-01 card at the rear of the rack, direct mechanical stress is placed on the card's backplane connector. Implement robust wire-tie and cable tray strain reliefs within the panel to decouple external weight. Ensure the total load on the -24 VDC transducer power loop does not exceed the system specifications when using non-standard extension cables or custom-length proximity sensor runs.

Commissioning & Wiring Tips

Always ground the sensor cable shields at the dedicated SHLD terminals on the 125680-01 module. Never ground the shield at both ends, as this introduces ground loops that corrupt low-voltage proximity measurements with 50/60 Hz industrial noise. Prior to active commissioning, verify that the configured transducer scale factor (e.g., 7.87 V/mm / 200 mV/mil) aligns precisely with the calibrated scale factor of the installed Proximitor sensor.

Installation Guidelines

CRITICAL WARNING: SAFETY FIRST De-energize the entire 3500 rack system prior to inserting or removing the 125680-01 I/O card. Hot-swapping backplane components under load risks transient electrical faults that can trigger false machinery trip commands. Ground yourself via an ESD wrist strap during the installation procedure.

Insert the 176449-01 monitor module into the chosen slot on the front of the 3500 rack. Ensure the ejector tabs lock firmly into position.

Align the 125680-01 internal termination I/O module with the matching rear slot guide rails and push firmly until the board seats fully into the backplane connector. Tighten the rear thumbscrews.

Connect the field wires to the internal screw terminals, securing the shield drain wire to the designated SHLD terminal for each respective channel.

Apply system power, establish connection with the 3500 Rack Configuration Software, upload the correct slot profile, and perform a loop check across all active transducer channels.

Key Features:

What is the difference between the 125680-01 and the 125680-02 I/O modules?

The 125680-01 module features internal screw-type terminations directly on the board for direct field wiring. The 125680-02 module utilizes external terminations, requiring an external termination block and multi-conductor interface cables.

Does the 176449-01 monitor module support hot-swapping in a live 3500 rack?

Yes, front-facing 3500/40M monitor modules can be hot-swapped. However, the rear I/O card (125680-01) must never be inserted or removed while power is applied to the rack, as this can corrupt adjacent module data or cause false trips.

Can this assembly be used for thrust position and radial vibration simultaneously?

Yes, each of the four channels on the 3500/40M monitor can be programmed independently for different measurement types, such as radial vibration, thrust position, or eccentricity, using the 3500 Rack Configuration software.

How should the transducer shield wire be grounded on the 125680-01 terminal strip?

The transducer cable shield must be terminated at the designated 'SHLD' terminal of the 125680-01 I/O module. Ensure the sensor-end shield is left floating and insulated to prevent ground loop noise.

Global Express Shipping

Standard Delivery: 4-6 Business Days via DHL, FedEx, and UPS.
Express Dispatch: Same-day dispatch for in-stock orders placed before 2:00 PM (GMT+8).
Worldwide Coverage: Serving over 150 countries, including rapid delivery to Saudi Arabia and UAE.

Returns & Warranty

30-Day Guarantee: Returns accepted for in-stock products in original, factory-sealed packaging.
12-Month Warranty: Every industrial component is backed by our professional technical warranty.

Orders are processed and delivered Monday-Friday (excluding public holidays).

For full eligibility, restocking fees, and international return details, please view our official Refund & Return Policy .

TECHNICAL SPECIFICATIONS

Country of origin

Bently Nevada 176449-01+125680-01 3500/40M Proximitor Monitor and I/O Module