Product Description:

The Bently Nevada 172045-01 (also referred to as the 3500/25 Enhanced Keyphasor Module) is a half-height, two-channel module designed for use in 3500 Machinery Protection Systems. It provides redundant or non-redundant phase reference signals to other monitor modules within the 3500 rack, ensuring accurate monitoring of machine health by measuring rotational speed, phase angle, and vibration data. This module is specifically engineered for vibration diagnostics in high-speed machinery such as turbines and compressors, where precise timing and signal processing are critical.

The Enhanced Keyphasor version offers superior signal processing capabilities compared to older Keyphasor modules, making it ideal for high-speed machinery applications that require rapid data analysis and reliable operation in harsh environments. It receives input from proximity probes or magnetic pickups that detect notches or projections on rotating shafts. The module then converts these pulses into digital timing signals that are used to calculate various parameters, including shaft RPM, phase angle, and vector data for advanced vibration analysis.

Key Features & Functions:

1. Redundant Operation:
   The 172045 module can be installed in a dual configuration for redundancy, providing backup phase reference signals if the primary module or sensor fails. This ensures that vector-based protection systems and other phase-dependent monitoring capabilities remain active.

2. Buffered TTL Pulse Output:
   The front panel features coaxial (BNC) connectors for buffered pulse outputs. These outputs provide raw pulse signals that can be sent to diagnostic instruments, such as an oscilloscope or Bently Nevada ADRE data acquisition system, without interrupting the system’s protective monitoring functions.

3. High-Speed Data Processing:
   With the ability to handle multiple notches or gear teeth on the rotating shaft, the Enhanced Keyphasor module allows for high-resolution speed data while simultaneously delivering clean Once-Per-Turn signals for advanced vibration analysis, such as orbits, Bode plots, and polar plots.

4. Automatic Threshold Adjustment:
   The auto-thresholding feature adjusts the triggering threshold dynamically, compensating for changes in gap voltage due to machine movement or temperature variations. This ensures that critical speed signals are maintained even during transients, preventing data loss.

Technical Specifications:

Installation & Configuration:

• The 172045 module is a half-height unit and must be installed in a dedicated slot, typically located in the left-most section of the rack (next to the power supplies).

• Transducer Supply: The module provides -24 VDC to power the Proximitor sensors directly.

• I/O Modules: The module requires either the 125800-01 (Internal Termination) or 126648-01 (External Termination) I/O module for the rear of the rack.

• Configuration: The Bently Nevada 3500 Rack Configuration Software is used to configure settings such as Events per Revolution and module orientation.

Applications:

The Bently Nevada 172045-01 Enhanced Keyphasor Module is primarily used in vibration monitoring systems for industrial machinery, particularly in high-speed applications where accurate phase and speed data is critical. Key use cases include:

• Turbines and Compressors: Monitoring rotating machinery in power plants or oil & gas facilities.

• Advanced Vibration Analysis: Generating orbits, Bode plots, and polar plots for comprehensive machine health diagnostics.

• Phased Migration Systems: Transitioning from older monitoring systems while maintaining accurate real-time vibration data.

Frequently Asked Questions (FAQ):

Q: What does the Bently Nevada 172045-01 Keyphasor module do?
A: The 172045-01 is a phase reference signal generator used in vibration monitoring systems. It converts signals from proximity probes or magnetic pickups into digital timing data, which is used to monitor machine speed, phase angles, and vibration parameters.

Q: Can I use this module for redundant setups?
A: Yes, the 172045-01 can be configured in a redundant setup to ensure continuous operation. If one module fails, the system automatically switches to the backup, ensuring reliable phase-dependent protection.

Q: How do I configure the 172045-01 Keyphasor module?
A: Configuration is done using the Bently Nevada 3500 Rack Configuration Software, where you define parameters like Events per Revolution and sensor orientation.

Q: What is the typical power consumption of the 172045-01?
A: The typical power consumption of the 172045-01 is 3.2 Watts.