Introduction
The Bently Nevada 3500/50 Tachometer Module, combined with its matching I/O module, is a key component of the 3500 Machinery Protection System, providing precise and dependable rotational speed measurement for critical rotating equipment. This module set is engineered to process pulse-based speed signals with high accuracy, supporting protection, monitoring, and control functions across a wide range of industrial applications.
Focused on protection-critical measurements, the 3500/50 delivers stable speed and reference data required for overspeed detection, startup supervision, and correlation with other condition monitoring parameters. Its design prioritizes signal integrity, system reliability, and long-term operational consistency.
Technical Specifications
| Item | Description |
|---|
| Product Configuration | Tachometer Module with dedicated I/O Module |
| System Platform | Bently Nevada 3500 Series |
| Monitoring Function | Rotational speed and tachometer measurement |
| Sensor Interface | Pulse-based speed and reference sensors |
| Channel Capability | Multi-channel pulse processing |
| Measurement Outputs | Speed, acceleration, and rotational reference |
| Signal Processing | Real-time pulse detection and conversion |
| Diagnostic Features | Continuous self-monitoring and fault detection |
| System Integration | 3500 backplane communication |
| Installation Format | Rack-mounted modules |
| Dimensions | 241.3 × 24.4 × 241.8 mm |
| Weight | 0.82 kg |
Applications
• Rotational Speed Monitoring for Turbomachinery
Applied in steam turbines, gas turbines, and compressors to deliver accurate shaft speed data for safe operation and system protection.
• Overspeed Detection and Protective Logic Support
Provides reliable speed input for overspeed alarms and trip mechanisms, reducing the risk of mechanical failure during abnormal events.
• Reference Signal Generation for Condition Monitoring
Supplies stable rotational reference signals that support synchronization and correlation across vibration and displacement monitoring modules.
Advantages
• Accurate and Stable Pulse Signal Processing
Optimized for precise detection of speed sensor pulses, ensuring dependable measurement across varying operating conditions.
• Dedicated I/O Module for Improved Signal Integrity
Separating I/O functions enhances wiring clarity and minimizes electrical interference, improving overall measurement reliability.
• Engineered for Continuous Protection Duty
Designed for uninterrupted operation, the module combination supports critical protection functions without compromising system performance.
Technical FAQs
1. What is the main function of the 3500/50 module?
It measures and processes rotational speed signals for machinery protection and monitoring.
2. Why is an I/O module used with the tachometer module?
The I/O module provides proper sensor interfacing and reliable signal routing to the tachometer module.
3. What types of sensors are compatible with this configuration?
Pulse-based speed sensors and rotational reference sensors are supported.
4. Can this module be used for overspeed protection?
Yes. It supplies essential speed data for overspeed detection and protective actions.
5. Is continuous operation supported?
Yes. The module is designed for continuous use in critical industrial environments.
6. Does the 3500/50 provide a rotational reference signal?
Yes. It generates reference information for system-wide synchronization.
7. Can the module operate outside the 3500 system?
No. It must be installed within a Bently Nevada 3500 rack.
8. How does it integrate with other monitoring modules?
Speed and reference data are shared via the backplane for coordinated monitoring and protection.
9. Which industries commonly deploy the 3500/50 module?
Power generation, oil and gas, petrochemical processing, and heavy industrial sectors.
10. What differentiates the 3500/50 from other 3500 modules?
Its specialization in pulse-based rotational speed and reference measurement distinguishes it from vibration and displacement modules.
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