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- Bently Nevada
- 323174-01
- ADAPT ESD CPU Module
- USA
- 304.8 × 180 × 254 mm
- 8.8 kg
- Xiamen, China
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Product Overview
The Bently Nevada 3701/55 323174-01 ADAPT ESD CPU Module is the processing component of the ADAPT Emergency Shutdown Device used for safety-related protection of rotating machinery and industrial process equipment. It executes configured shutdown logic using speed, discrete and analog input information, then coordinates trip decisions through the system’s relay output architecture.
The ADAPT ESD platform uses a triple-modular-redundant (TMR) architecture with three CPU modules processing shared discrete and analog input information. Each CPU also processes two dedicated speed inputs. This arrangement supports comparison of independent processing results and voting strategies intended to reduce the risk of an incorrect shutdown decision or a missed trip.
The CPU receives its trip logic configuration through Bently Nevada Monitor Configuration software. The application can combine speed limits, process conditions and discrete status signals into shutdown logic with up to 500 logic steps. For maintenance teams, the important considerations are preserving the validated configuration, confirming the input assignments and verifying the complete shutdown path after a module replacement.
Technical Specifications
| Parameter | Specification |
|---|---|
| Manufacturer | Bently Nevada |
| System Model | 3701/55 |
| CPU Part Number | 323174-01 |
| Product Family | ADAPT ESD |
| Product Type | ADAPT ESD CPU Module |
| Primary Function | Emergency shutdown logic processing |
| System Architecture | Triple Modular Redundancy (TMR) |
| CPU Modules per System | 3 |
| Discrete Inputs Processed | 32 |
| Analog Inputs Processed | 12, configurable as discrete or 4–20 mA analog inputs |
| Speed Inputs | 2 per CPU module; 6 across the system |
| Recorder Outputs | 2 internally powered 4–20 mA outputs per CPU |
| Ethernet | Redundant Ethernet connections |
| Ethernet Data Rate | 10/100 Mbps |
| Network Protocol | TCP/IP |
| Maximum Logic Capacity | Up to 500 logic steps |
| Nominal Logic Processing Time | 2 ms |
| Relay Toggle Time | 8 ms |
| System Input Voltage | 18–36 V DC |
| Typical System Power Consumption | 24 W |
| Maximum System Power Consumption | 35 W |
| Operating Temperature | -30 to +65 °C |
| Storage Temperature | -45 to +85 °C |
| Humidity | 0–95% RH, non-condensing |
| Functional Safety | SIL 3 system capability, subject to the applicable safety configuration |
| Dimensions | 304.8 × 180 × 254 mm |
| Weight | 8.8 kg |
Product Features
- Triple-redundant processing architecture: Three CPU modules process shared input information to support redundant shutdown decision-making.
- Integrated speed processing: Each CPU processes two speed inputs, supporting overspeed protection applications.
- Discrete and analog input handling: Processes 32 discrete inputs and 12 analog inputs, with analog channels configurable for discrete or 4–20 mA signals.
- Configurable shutdown logic: Supports application logic containing up to 500 logic steps.
- Fast logic execution: Specifies nominal input-to-output logic processing of 2 ms, with an 8 ms relay toggle time.
- Redundant Ethernet connections: Supports network communication through redundant Ethernet interfaces.
- Powered recorder outputs: Provides two internally powered 4–20 mA recorder outputs per CPU.
- Configurable trip behavior: Supports application-specific relay control and voting arrangements, including independent and two-out-of-three voting where configured.
- Software-based configuration: Uses Monitor Configuration software to define shutdown logic and related settings.
- Safety-system integration: Operates as a processing element within a configured ADAPT ESD shutdown system rather than as a standalone replacement for the complete system.
Working Principle
The 323174-01 CPU processes the input information assigned to the ADAPT ESD system. Discrete inputs report equipment states, analog inputs carry supported 4–20 mA signals, and speed inputs provide rotational-speed information for protection functions. The configured logic evaluates these conditions against the application’s shutdown criteria.
The 3701/55 system distributes input processing across three CPUs. Each CPU processes the shared discrete and analog input array and its two unique speed inputs. The resulting decisions are used by the configured relay architecture, which can operate in independent or voting arrangements according to the application.
The CPU executes the logic configured through Monitor Configuration software. Logic can combine multiple conditions, interlocks and voting requirements before a trip command is issued. The nominal logic processing time is 2 ms, while the specified relay toggle time is 8 ms; actual shutdown performance depends on the complete system configuration and the connected trip devices.
The CPU also supports redundant Ethernet communication and provides two internally powered 4–20 mA recorder outputs. These interfaces support system communication and the recording of configured measurements. They do not replace the hardwired safety path or the physical relay output components required to execute a shutdown.
When replacing a CPU, technicians should restore the validated configuration, verify network assignments and confirm the correct input mapping. A successful power-up alone does not demonstrate that the safety function is correct. The complete configured shutdown path must be functionally tested before the protected machinery returns to service.
Role in a Bently Nevada ADAPT ESD Safety Architecture
The 323174-01 is the processing element that evaluates configured protection logic within the 3701/55 ADAPT ESD system. It works alongside the terminal base, input wiring and relay output modules to convert detected process or machinery conditions into defined shutdown actions.
| System Component | Function | Relationship to the 323174-01 CPU |
|---|---|---|
| ADAPT ESD CPU Module 323174-01 | Processes protection inputs and executes trip logic | Evaluates configured shutdown conditions |
| ADAPT ESD Terminal Base 289761-01 | Provides the system’s module mounting and electrical connection arrangement | Supports installation of the CPU and associated modules |
| ADAPT ESD Relay Output Module 323073-01 | Provides relay contacts for shutdown and status functions | Executes configured relay commands |
| ADAPT ESD Gold-Plated Relay Output Module 323073-02 | Provides the specified gold-plated relay option | Used only when the selected application and approvals permit |
| Discrete Input Circuits | Report switch, contact and equipment states | Supply status conditions to the shutdown logic |
| 4–20 mA Analog Input Circuits | Carry supported process measurements | Provide analog values for configured protection logic |
| Speed Input Sensors | Measure rotational speed | Supply speed information for overspeed protection |
| Industrial DC Power Supply | Powers the ESD system | Must satisfy the specified system supply requirements |
| Ethernet Network | Supports configured system communication | Connects the CPU’s redundant network interfaces |
| Monitor Configuration Software | Defines shutdown logic and configuration settings | Supplies the application configuration used by the CPU |
| External Trip Device | Stops or isolates the protected machinery or process | Responds to the configured shutdown output circuit |
Industrial Applications
| Application | Protection Requirement | Role of the 323174-01 CPU |
|---|---|---|
| Steam Turbines | Detect overspeed and configured abnormal operating conditions | Evaluates speed and other protection inputs to initiate shutdown logic |
| Gas Turbines | Execute high-speed protective trips | Processes configured speed inputs and trip criteria |
| Hydro Turbines | Protect rotating equipment against defined overspeed conditions | Evaluates speed information within the ESD logic |
| Industrial Expanders | Initiate shutdown when configured limits are exceeded | Processes the input conditions used by the trip application |
| Centrifugal Compressor Packages | Coordinate shutdown signals from machinery and process interlocks | Evaluates configured discrete, analog and speed-related conditions |
| Oil and Gas Facilities | Implement safety-related shutdown sequences | Executes validated trip logic within the ADAPT ESD architecture |
| Petrochemical Process Equipment | Respond to configured abnormal process conditions | Processes analog and discrete inputs used by the shutdown application |
| Power Generation Plants | Coordinate protective shutdown actions for rotating machinery | Supports redundant processing of safety-related trip conditions |
Installation and Maintenance
- Verify the CPU part number: Confirm that the replacement is 323174-01 and belongs to the 3701/55 ADAPT ESD system.
- Check the system architecture: Verify the installed CPU count and the intended TMR arrangement before removing or replacing a processing module.
- Follow approved isolation procedures: Apply the site’s safety and maintenance procedures before working on the shutdown system or its power connections.
- Inspect the terminal base: Check the 289761-01 terminal base and its connectors for damage, contamination or loose connections.
- Confirm input assignments: Verify the discrete, analog and speed input mapping against the approved application drawings.
- Check the power supply: Confirm that the system supply remains within the specified 18–36 V DC input range and meets the system’s power requirements.
- Verify network connections: Inspect both Ethernet connections, confirm the configured network settings and check for communication faults.
- Restore the validated configuration: Load or verify the approved Monitor Configuration settings and confirm that the correct logic version is in use.
- Inspect relay output modules: Confirm that the installed 323073 series relay modules and their relay options match the application design.
- Test input processing: Verify the expected response to simulated or approved test signals for discrete, analog and speed inputs.
- Perform a complete trip test: Validate the configured logic, voting behavior, relay actuation and external shutdown response using the approved proof-test procedure.
- Record commissioning results: Document the CPU reference, configuration version, network settings, test results and any outstanding faults before returning the system to service.
Compatible System Components
| Component | Function | Compatibility Consideration |
|---|---|---|
| Bently Nevada 289761-01 | ADAPT ESD Terminal Base Assembly | Confirm the required terminal base and system revision |
| Bently Nevada 323073-01 | ADAPT ESD 4-Channel Relay Output Module | Verify relay configuration and trip-circuit requirements |
| Bently Nevada 323073-02 | ADAPT ESD 4-Channel Gold-Plated Relay Output Module | Check application requirements and hazardous-area approval limitations |
| Bently Nevada 289036-01 | ADAPT ESD Spare Terminal Block | Match the terminal block to the installed base assembly |
| Bently Nevada 178487 / 178490 | ADAPT ESD Spare Relay Connectors | Confirm the required connector style and relay module arrangement |
| Bently Nevada 324343 | ADAPT ESD Weatherproof Enclosure | Verify enclosure suitability for the installation environment |
| Monitor Configuration Software | Configures the ESD application | Use the approved software version and validated configuration |
| Speed Sensors | Supply rotational-speed signals | Verify sensor type and signal compatibility with the ESD inputs |
| 4–20 mA Transmitters | Supply analog process measurements | Confirm input configuration, signal range and wiring |
| Industrial DC Power Supply | Powers the shutdown system | Check supply range, capacity and installation requirements |
Recommended Related Models
| Model | Product Type | Relationship | Selection Consideration |
|---|---|---|---|
| Bently Nevada 323174-01 | ADAPT ESD CPU Module | Exact CPU part number | Verify the complete system configuration and approved replacement procedure |
| Bently Nevada 3701/55 | ADAPT ESD Emergency Shutdown Device | Associated ESD system | Confirm the system version, redundancy arrangement and required approvals |
| Bently Nevada 289761-01 | ADAPT ESD Terminal Base Assembly | Associated mounting and connection component | Match the terminal base to the installed CPU and system configuration |
| Bently Nevada 323073-01 | ADAPT ESD 4-Channel Relay Output Module | Associated relay output component | Confirm contact ratings, trip logic and relay arrangement |
| Bently Nevada 323073-02 | ADAPT ESD 4-Channel Gold-Plated Relay Output Module | Alternative relay module option | Verify contact requirements and approval restrictions before selection |
| Bently Nevada 289036-01 | ADAPT ESD Spare Terminal Block | Related maintenance component | Match the terminal block to the installed assembly |
Key Advantages
- Executes configured shutdown logic within the 3701/55 ADAPT ESD system.
- Supports a triple-modular-redundant processing architecture.
- Processes discrete, analog and speed-related protection inputs.
- Supports configurable trip logic with up to 500 logic steps.
- Provides redundant Ethernet connections and powered 4–20 mA recorder outputs.
- Supports integration with the system’s relay output modules and external trip circuits.
Technical FAQs
What is the role of the 323174-01 CPU in a triple-modular-redundant ADAPT ESD system?
Each CPU independently processes the applicable input information and evaluates the configured trip logic. The three-CPU architecture supports redundant decision-making and configured voting strategies; the CPU is one part of the complete shutdown system, not a standalone ESD solution.
How are the 12 analog inputs used in the ADAPT ESD application?
The system processes 12 analog inputs that can be configured for discrete or 4–20 mA analog signals. The actual use of each channel depends on the approved application configuration, transmitter type and assigned shutdown logic.
What is the difference between the 2 ms logic processing time and the 8 ms relay toggle time?
The 2 ms figure describes nominal processing time for the input-to-output decision logic. The 8 ms figure describes relay toggle time. The complete time to achieve a physical shutdown also depends on the configured system, relay circuit and external trip device.
Why must the full shutdown function be tested after replacing a CPU module?
A CPU can start successfully while input mapping, network configuration, logic settings or relay behavior remain incorrect. A complete functional test verifies that the configured conditions produce the intended trip response and that the external shutdown path operates as required.