Component Description
The part number 3500/33 184631-01+149986-01 refers to a specific configuration of modules for the Bently Nevada 3500 Monitoring System.
3500/33: This designates a Dual-Channel Speed Module. This module is a critical component for monitoring the rotational speed (RPM) and phase reference of machinery. It processes signals from proximity probes, magnetic pickups, or other speed sensors to determine shaft speed, provide a Keyphasor® reference, and monitor for overspeed and zero-speed conditions.
184631-01: This is a specific hardware revision or assembly number for the Speed Module.
149986-01: This is a Relay Module. This module provides physical relay outputs that are actuated based on alarm statuses received from other monitoring modules within the 3500 rack, such as the Speed Module.
In summary, this part number represents a Dual-Channel Speed Module paired with a Relay Module. This combination provides comprehensive speed monitoring (including overspeed protection) and the ability to execute protective actions (like initiating a turbine trip) through relay outputs, all within a single unit of a Bently Nevada 3500 rack.
Key Parameters
The following table outlines the key parameters for this module configuration.
| Parameter | Specification |
|---|---|
| System | Bently Nevada 3500 |
| Primary Function | Speed Monitoring & Protective Relay Output |
| Speed Inputs | Two independent channels. |
| Input Types | Accepts signals from proximity probes, magnetic pickups, and other speed sensors. |
| Keyphasor Function | Provides a once-per-turn pulse signal for phase reference. |
| Monitoring Capabilities | RPM measurement, Overspeed detection, Zero-speed detection, and Rate-of-change. |
| Relay Outputs | Typically 4 or 6 independent, configurable Form-C relays (dependent on the specific relay variant). |
| Relay Contacts | SPDT (Single Pole Double Throw), often rated for 2A @ 30VDC or 250VAC. |
| Mounting | Slides into dedicated slots in a 3500 rack. |
| Dimensions (H x W x D) | Approx. 193 mm x 55 mm x 200 mm (7.6 in x 2.16 in x 7.87 in) per module |
| Weight | Approx. 0.5 - 0.7 kg (1.1 - 1.5 lbs) per module |
Application Scenarios
This module configuration is deployed in scenarios where precise speed monitoring and immediate protective action are paramount for machine safety and operation.
Overspeed Protection for Turbines:
Application: Gas and Steam Turbines.
Function: The Speed Module continuously monitors turbine RPM. If the speed exceeds a predefined dangerous setpoint, the integrated Relay Module is immediately activated to trip the turbine by closing the steam or fuel valves, preventing catastrophic mechanical failure.
Zero-Speed Monitoring for Coal Crushers & Large Mills:
Application: Power generation and heavy industry.
Function: Monitors for a "zero-speed" condition to ensure equipment like coal crushers or rotary mills has completely stopped before allowing maintenance or inspection, ensuring personnel safety.
Sequencing and Control for Compressors & Pumps:
Application: Critical compressor and pump trains.
Function: The Speed Module provides vital speed signals for control systems during startup and shutdown sequences. The relays can be used to initiate the startup of auxiliary systems (like lube oil pumps) once a certain turning gear speed is reached or to activate anti-surge controls.
Keyphasor Source for Vibration Monitoring:
Application: Any machinery with vibration monitoring systems.
Function: Serves as the primary Keyphasor signal source for an entire 3500 rack, providing the essential timing reference for all vibration and position modules to measure phase lag, which is critical for rotor dynamics analysis and balancing.
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