Bently Nevada 323174-01 Emergency Shutdown Device – Hardwired Trip Protection for Critical Machinery

The Bently Nevada 323174-01 is an Emergency Shutdown Device designed to provide fast, hardwired trip action when a machine exceeds safe limits. From my experience, this type of ESD is typically installed alongside vibration/overspeed monitoring to give you a deterministic, no-software path to safe shutdown. You might notice that it’s built for plants where a few milliseconds and clear relay logic make all the difference—compressors, steam turbines, pumps, and similar rotating assets.

Company’s Order Placement Process and Guarantees

Key Features

• Hardwired shutdown logic – Provides a deterministic trip path without relying on PLC or network latency.
• Fail-safe relay design – Typically arranged de-energized to trip, so loss of power drives to a safe state.
• Works alongside Bently Nevada monitoring – Pairs with machine condition monitoring to implement final trip action on high vibration, overspeed, or other critical events.
• 24 VDC control power – Common plant supply simplifies panel integration and maintenance.
• Clear I/O status – Indicator LEDs and labeled terminals (in most cases) make commissioning and troubleshooting faster.
• Industrial temperature range – Suitable for control cabinets in harsh sites when installed per standard practices.

Technical Specifications

Brand / Model	Bently Nevada 323174-01
Product Type	Emergency Shutdown Device (ESD), hardwired trip relay module
HS Code	90328900 (Automatic regulating or controlling instruments and apparatus)
Power Requirements	24 VDC nominal (typically 18–30 VDC range)
Operating Temperature	-20 to +60 °C (industrial, non-condensing; cabinet installation recommended)
Signal Inputs	Discrete trip logic input (dry contact or 24 VDC logic, depending on configuration)
Signal Outputs	Hardwired safety relay contacts (Form C / normally de-energized fail-safe)
Communication Interfaces	Hardwired I/O; no fieldbus required for shutdown function
Installation Method	DIN-rail or panel mounting inside a protected control cabinet

Application Fields

Plants deploy the 323174-01 wherever a verified final trip is required. Typical use cases include:

• Compressors and steam/gas turbines – final trip on high vibration, overspeed, or thrust position alarms.
• High-head pumps and blowers – shutdown on mechanical protection limits to avoid seal and bearing damage.
• Refining and petrochemical skids – independent, hardwired trip to satisfy process hazard analysis recommendations.
• Power generation packages – segregated trip layer complementing the control system or PLC.

A maintenance supervisor told us they “moved the trip function out of the PLC for the critical compressor, and the ESD made proof testing simpler while keeping the logic crystal clear.”

Advantages & Value

• Reliability – Hardwired relays with fail-safe behavior reduce dependence on software and networks.
• Compatibility – Integrates cleanly with Bently Nevada monitoring chains and standard plant interlocks.
• Lifecycle cost – Straightforward proof testing and spare strategy tend to lower operational overheads.
• Support – We help with pre-shipment checks, wiring guidance, and replacement planning to minimize downtime.

Installation & Maintenance

Quality & Certifications

• CE marking and RoHS conformity are commonly applied to Bently Nevada control/monitoring hardware.
• UL/cUL compliance where applicable for control equipment intended for industrial panels.
• Manufacturer’s warranty: typically covered; we provide a 365-day warranty on supply.
• Traceable serial numbers and test documentation available on request.

Frequently Paired Components (for a complete protection chain)

• Bently Nevada 3500 series monitoring rack and modules (e.g., vibration/temperature monitors)
• Bently Nevada 3300 XL proximity probe systems (probes, extension cables, Proximitor sensors)
• Keyphasor sensors for speed/phase reference
• Redundant trip solenoids and valve interposers for final element actuation