Bently Nevada 128718-01 Keyphasor Interface Connector

Product Overview

The Bently Nevada 128718-01 functions as a high-integrity External Termination Block (ETB) designed specifically for the Keyphasor monitoring modules within a 3500 Series rack. This component facilitates the secure connection between field-mounted proximity sensors and the 3500/25 Keyphasor I/O module. We supply this unit as 100% Brand New and Original, ensuring reliable phase reference and speed data transmission for critical turbomachinery protection.

Technical Specifications

Engineering Advantages

• Streamlined Signal Routing: The 128718-01 eliminates the need for complex, direct-to-rack wiring. It centralizes field connections at the terminal block, allowing maintenance teams to troubleshoot sensor leads without disturbing the primary 3500 rack backplane.

• Enhanced Signal Integrity: This termination block maintains the precise voltage pulses required for Keyphasor timing. By providing low-resistance contact points, it prevents pulse distortion that could lead to inaccurate phase angles or RPM readings.

• Rugged Industrial Termination: Engineered for high-vibration and electrically noisy environments, the terminal screws provide a vibration-proof grip on shielded twisted-pair cables. This ensures a consistent electrical path for the Keyphasor's once-per-turn reference signal.

• Rapid System Deployment: The ETB utilizes a standardized pinout that matches the 3500/25 I/O interface. This reduces wiring errors during system commissioning and shortens the downtime required during sensor replacement or system upgrades.

FAQs

1. Does the 128718-01 require a specialized cable to connect to the 3500 rack?

Yes. You typically use a multi-conductor shielded cable with a 25-pin D-sub connector to interface this termination block with the 3500/25 Keyphasor I/O module located at the rear of the rack.

2. Can I use this termination block for standard vibration probes?

The 128718-01 specifically serves Keyphasor (speed/phase) signals. For standard 4-channel vibration monitors, you must use the corresponding Proximitor/Seismic External Termination Blocks to ensure correct impedance and signal mapping.

3. Is this unit compatible with both internal and external termination I/O modules?

This block works specifically with "External Termination" style I/O modules. If your 3500 rack uses internal termination (where field wires connect directly to the back of the rack), this ETB is not required.

4. What is the benefit of using an External Termination Block?

ETBs allow you to locate the field wiring terminals up to 300 meters away from the 3500 rack. This simplifies cabinet layout and protects the rack electronics from potential wiring mishaps during field maintenance.