Bently Nevada 3300 Series Modules – 3300/14 DC Power Supply

Technical Dossier

Product Details And Specifications

Bently Nevada 3300 Series Technical Notes

The Evolution of 3300 Series Architecture

The 3300 Series was developed during the late 1980s and entered widespread deployment through the 1990s as a direct response to industry demand for a modular, rack-based alternative to the earlier 3100 and 7200 Series panel-mount instruments. The core architectural principle is a passive backplane carrying a proprietary parallel bus, into which individual transducer interface, signal conditioning, and power supply modules are inserted. Early revisions of the platform used discrete analog signal chains with relay-based alarm outputs. Subsequent hardware revisions introduced programmable setpoints, 4–20 mA analog outputs, and RS-232/RS-422 serial communication ports for integration with early DCS and SCADA systems. The 3300 Series operates in parallel with the later 3500 Series, which introduced a fully digital, networked architecture with Modbus and Ethernet connectivity. Many facilities continue to operate 3300 Series racks alongside 3500 Series systems, creating mixed-generation compatibility challenges that require careful attention to transducer wiring standards, power supply voltage rails, and alarm relay logic. The 3300 Series is now classified as a mature/end-of-life platform by Bently Nevada (a Baker Hughes company), meaning new production of certain modules has been discontinued. Long-term maintenance support, including tested surplus and refurbished modules, is therefore essential for facilities committed to extending the operational life of existing installations.

3300 Series Full Catalog & Functionalities (SKU List)

The following SKUs represent the core module range of the Bently Nevada 3300 Series, organized by functional category. Each entry reflects a distinct hardware module with a defined measurement or power function within the rack system.

Power Supply Modules

• 3300/14: DC input power supply module; converts external DC source to regulated internal rack voltages for 3300 Series backplane.
• 3300/15: AC input power supply module; provides regulated power from 115/230 VAC mains to the 3300 Series rack bus.
• 3300/16: Dual-input redundant power supply; supports automatic switchover between two independent power sources for high-availability installations.

Proximity (Eddy-Current) Transducer Interface Modules

• 3300/20: Single-channel proximity transducer interface; conditions raw eddy-current probe signal for shaft radial displacement measurement.
• 3300/25: Dual-channel proximity monitor; simultaneous X-Y radial vibration measurement for a single bearing plane.
• 3300/46: Thrust position monitor; measures axial shaft displacement using a single proximity probe channel with configurable alert/danger setpoints.
• 3300/47: Differential expansion monitor; tracks relative thermal growth between rotor and casing using two proximity probe inputs.
• 3300/48: Eccentricity monitor; measures shaft bow at slow-roll speeds prior to turbine startup sequences.

Velocity Transducer Interface Modules

• 3300/50: Single-channel velocity monitor; interfaces with seismic velocity transducers for casing vibration measurement.
• 3300/55: Dual-channel velocity monitor; simultaneous two-axis casing vibration measurement from velocity-type sensors.

Accelerometer Interface Modules

• 3300/60: Single-channel accelerometer monitor; conditions piezoelectric accelerometer signals for high-frequency bearing defect detection.
• 3300/65: Dual-channel accelerometer monitor; two independent accelerometer inputs with independent alarm relay outputs per channel.

Speed and Phase Reference Modules

• 3300/93: Tachometer/speed monitor; processes once-per-revolution keyphasor signals for rotational speed measurement and phase reference.
• 3300/95: Dual-speed monitor; supports two independent tachometer inputs for multi-shaft or redundant speed measurement configurations.

Communication and System Modules

• 3300/10: System monitor and communication interface; provides rack-level diagnostics and serial data output to host DCS or data acquisition systems.
• 3300/12: Relay output module; provides additional dry-contact relay outputs for alarm and shutdown logic beyond the capacity of individual monitor cards.