Bently 126648-01 vibration monitoring system preamplifier

The 126648-01 is a half-height, two-channel I/O module (Input/Output module) that connects to the 3500/25 Enhanced Keyphasor Module in the main 3500 rack.

• Core Function: It receives raw input signals from proximity probes or magnetic pickups (transducers) mounted on rotating machinery. It converts these signals into a precise, synchronous digital pulse called a Keyphasor signal.

• Purpose of Keyphasor Signal: This once-per-turn or multiple-event-per-turn pulse is the essential timing reference for the entire 3500 system. It allows other monitor modules to accurately measure:

• Shaft Rotative Speed (RPM)

• Vector parameters like 1X vibration amplitude and phase (crucial for diagnostic analysis of machinery health).

• Isolation Feature: The "Isolated" designation means this module is specifically designed for applications where the Keyphasor signal must be simultaneously connected to multiple devices (e.g., the 3500 system and an external control system like a DCS/PLC) and requires electrical isolation to prevent signal interference.

⚙️ Product Specifications (Product Parameter)

✨ Product Advantages (Product Advantages)

• Superior Signal Integrity & Isolation: The primary advantage is the electrical isolation, which prevents grounding issues and electrical noise from external systems (like control systems) from corrupting the critical Keyphasor signal used by the 3500 monitoring system.

• Enhanced Compatibility: It's compatible with both magnetic pickups (its intended design focus) and proximity probes, offering flexibility.

• High Precision: Provides the high-accuracy timing pulse required for advanced vibration and phase analysis, ensuring reliable machinery diagnostics.

• Downward Compatibility: The Enhanced Keyphasor Module (3500/25) maintains functional compatibility with older Bently Nevada systems, simplifying upgrades.

• TMR Support: The Keyphasor modules can be configured in a paired (redundant) arrangement for Triple Modular Redundancy (TMR) applications, maximizing system reliability.

⚠️ Important Considerations (Notes/Precautions)

• I/O Module Type: This is the External Terminations I/O module. This means a separate External Termination Block and Cable must be ordered to connect field wiring to the 3500 rack. It cannot be used with Internal Termination modules.

• External Power for Proximitors: When used with proximity probes (Proximitors), an external power supply is required to provide the necessary isolation.

• Configuration Complexity: Utilizing the expanded signal processing features of the Enhanced Keyphasor Module may involve complex configuration settings, and consulting a qualified Bently Nevada representative is recommended.

• TMR Configuration: For redundant (TMR) applications, two Keyphasor modules are required to provide primary and secondary Keyphasor signals to the other modules in the rack.