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- ABB Bailey
- NRAI02
- Analog Input Termination Unit
- Sweden (SE)
- 300 × 35 × 120 mm
- 0.82 kg
- Xiamen, China
- New & In Stock
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Product Overview
The ABB Bailey NRAI02 INFI 90 Analog Input Termination Unit is a termination component used in compatible INFI 90 distributed control system installations. It forms part of the interface between field wiring and the associated control-system hardware, providing a designated connection point for analog input circuits within the configured system architecture.
In industrial process control applications, analog signals are commonly used to represent measured variables such as pressure, temperature, flow, and liquid level. These signals originate from field instruments and must be routed through the appropriate termination and interface hardware before the control system can use them for monitoring, process calculations, alarms, or closed-loop control. A correctly matched termination unit helps maintain the intended wiring arrangement between field circuits and the associated input electronics.
The NRAI02 is relevant to INFI 90 system installation, maintenance, and replacement work where the existing termination arrangement must be preserved. During cabinet construction or equipment servicing, technicians need to confirm the unit’s model designation, its connection arrangement, and its compatibility with the associated system hardware. These checks are particularly important when maintaining established control systems, where replacing a component with a visually similar but electrically different unit may introduce wiring or signal-interface problems.
For maintenance planning, the NRAI02 should be identified by its complete part number and verified against the installed system documentation. The exact terminal assignments, supported signal types, and associated input-module compatibility should be confirmed before connecting field wiring.
Technical Specifications
| Parameter | Specification |
|---|---|
| Brand | ABB Bailey |
| Model Number | NRAI02 |
| Product Series | INFI 90 |
| Product Type | Analog Input Termination Unit |
| Functional Category | Analog input signal termination |
| System Application | Compatible ABB Bailey INFI 90 control systems |
| Primary Function | Provides a termination interface for analog input wiring |
| Signal Path | Field analog circuits to the designated control-system interface |
| Connected Equipment | Verify the compatible input hardware against system documentation |
| Terminal Assignment | Refer to the applicable wiring diagram and product documentation |
| Supported Signal Types | Confirm from the system configuration and technical documentation |
| Installation Environment | Industrial control cabinet or approved equipment installation |
| Maintenance Application | Inspection, replacement, and restoration of compatible termination hardware |
| Dimensions | 300 × 35 × 120 mm |
| Weight | 0.82 kg |
Product Features
- Analog input termination: The NRAI02 serves as a termination unit within a compatible INFI 90 control-system installation. It provides the designated interface for connecting analog input wiring to the associated control-system hardware.
- INFI 90 system integration: The unit belongs to the ABB Bailey INFI 90 product family. Its use should follow the system’s established hardware configuration, including the specified input modules, termination arrangement, and wiring assignments.
- Organized field wiring: A dedicated termination point helps technicians arrange incoming instrument wiring according to the control cabinet’s connection plan. Clear wiring organization can simplify inspection, signal tracing, and maintenance activities.
- Support for analog signal paths: Analog input circuits carry continuously varying electrical signals from field instrumentation. The NRAI02’s termination role supports the physical connection of these circuits to the designated input interface; the exact supported signal ranges must be verified from the relevant documentation.
- Maintenance and replacement suitability: When an existing termination unit requires replacement, the NRAI02 model designation helps technicians identify the intended component. The original wiring arrangement and connected hardware should be checked before the replacement is installed.
- Compatibility-focused installation: Correct use depends on matching the unit to the specified INFI 90 equipment and connection scheme. Verifying the model number, terminal assignments, and interface requirements helps avoid wiring errors.
- Support for established control installations: In facilities operating INFI 90 systems, retaining the correct termination hardware can help maintain the original control cabinet layout and established field wiring practices.
- Clear component identification: Recording the NRAI02 part number in equipment schedules, maintenance records, and spare-parts inventories helps technicians distinguish the unit from other termination components used in the same control system.
Working Principle
The ABB Bailey NRAI02 operates as a termination interface for analog input circuits in a compatible INFI 90 control-system configuration. Field instruments generate electrical signals corresponding to measured process variables. Those signals are routed through the plant’s field wiring and connected to the designated termination points according to the system wiring design.
Once the field conductors are connected, the termination unit provides the physical connection between the incoming wiring and the specified control-system interface. The associated input hardware receives the signal through the configured connection path and performs the functions assigned to that hardware. Depending on the system architecture, these functions may include signal acquisition, conversion, scaling, monitoring, and transfer of measurement values to control logic.
The termination unit itself should not be assumed to perform analog-to-digital conversion, signal isolation, calibration, or control calculations unless those functions are explicitly documented for the particular hardware. Its role is to support the correct electrical termination and connection of the analog input circuits within the larger control system.
During commissioning or troubleshooting, technicians verify that each field conductor is connected to the correct terminal and that the associated input hardware matches the intended signal type. If a process measurement is missing, unstable, or inconsistent with the field instrument, the investigation may include checking the field device, wiring continuity, terminal connections, input-channel configuration, and associated module diagnostics.
Role in an ABB Bailey INFI 90 Control Architecture
| System Element | Relationship to the NRAI02 |
|---|---|
| Field Instruments | Supply analog measurement signals representing process variables such as pressure, temperature, flow, or level. The signals must be connected to the appropriate termination points. |
| Field Wiring | Carries instrument signals from the process area to the control cabinet. Correct identification and routing are necessary to maintain the intended signal path. |
| Analog Input Termination | The NRAI02 provides the designated termination interface where specified by the installed INFI 90 configuration. |
| Analog Input Hardware | Receives signals through the configured termination arrangement. The exact compatible input-module models must be confirmed from system documentation. |
| Control-System Processing | The associated control hardware uses acquired measurement data for monitoring, alarms, process calculations, or control functions. These functions are performed by the relevant system components rather than assumed to be performed by the termination unit. |
| Operator Monitoring | Correct field-signal connections help the control system obtain the measurements required for operator displays and process supervision. |
| Maintenance and Troubleshooting | The termination unit provides an identifiable inspection point when technicians trace field wiring or investigate suspected connection problems. |
| Spare Parts Management | Recording the NRAI02 designation helps ensure that replacement hardware is matched to the existing termination arrangement. |
Industrial Applications
| Application | Role of the NRAI02 |
|---|---|
| Process Measurement Systems | Provides a termination interface for analog input circuits associated with field instruments in compatible INFI 90 installations. |
| Temperature Monitoring | Supports the wiring arrangement for temperature measurement circuits when the associated input hardware and system documentation specify a compatible connection. |
| Pressure and Flow Monitoring | Can form part of the termination path for pressure or flow instrumentation in a configured control system. Actual signal compatibility depends on the connected equipment. |
| Liquid Level Monitoring | Supports the field wiring interface for level measurement signals where the installed INFI 90 configuration uses the NRAI02. |
| Industrial Control Cabinets | Provides a designated termination point that helps organize field conductors and their connections to the control-system input hardware. |
| Distributed Control System Maintenance | Allows technicians to identify and inspect a specific analog input termination component during scheduled maintenance or fault investigation. |
| Legacy Control System Support | Helps maintenance teams retain the established wiring arrangement in facilities continuing to operate compatible ABB Bailey INFI 90 equipment. |
| Control Cabinet Refurbishment | May be used when restoring a cabinet’s termination hardware, provided the part number, connection arrangement, and associated input equipment have been verified. |
| Instrumentation Troubleshooting | Provides an accessible point for checking wiring identification and terminal connections when investigating missing or abnormal measurement signals. |
| Spare Parts Replacement | Supports model-specific inventory planning for facilities that need to maintain existing INFI 90 termination assemblies. |
Installation and Maintenance
- Verify the product identification. Confirm that the component is marked ABB Bailey NRAI02 and that its designation matches the replacement or installation requirement. Do not select a termination unit solely because its physical appearance resembles the existing component.
- Confirm system compatibility. Review the applicable INFI 90 hardware documentation to establish whether the NRAI02 is specified for the intended installation. Check the associated input hardware and termination arrangement before beginning work.
- Review the wiring documentation. Obtain the relevant cabinet drawings, terminal schedules, and connection information. Identify the field circuits, terminal assignments, and associated input channels before disconnecting any existing conductors.
- Follow equipment isolation procedures. Determine the required maintenance state for the affected equipment and follow the site’s approved isolation procedures. Consider the process consequences of interrupting measurement signals before removing or replacing the termination unit.
- Inspect the termination unit. Examine the accessible terminals, connector areas, mounting points, and insulating surfaces for visible damage, contamination, corrosion, or signs of overheating. A damaged component should be assessed before being installed or returned to service.
- Identify and label field conductors. Before disconnecting existing wiring, verify the conductor identification against the wiring drawings and label the conductors where necessary. Accurate identification helps prevent crossed signals or incorrect terminal assignments during reconnection.
- Check terminal and interface requirements. Confirm that the field conductors, connectors, and associated hardware match the intended termination arrangement. Use the specified connection information rather than assuming that terminals or interfaces are interchangeable with those of another unit.
- Mount the unit securely. Install the NRAI02 in the designated location using the approved mounting arrangement. Ensure that the unit is properly supported and that the installation does not interfere with adjacent components, wiring ducts, or cabinet covers.
- Reconnect the field wiring. Connect each conductor to its documented terminal and check that the connection is secure. Follow the applicable requirements for conductor preparation, terminal tightening, and wiring separation; do not guess at terminal assignments or torque values.
- Inspect wiring routing and separation. Check that field conductors follow the cabinet’s wiring plan and are not pinched, excessively bent, or placed under mechanical strain. Maintain the separation and routing practices specified for the installed control system.
- Verify signal operation. After the wiring has been checked and the equipment is ready for operation, follow the approved commissioning procedure to confirm that the associated input channels receive the expected signals. Investigate abnormal readings by checking the field instrument, wiring, termination points, and input-module configuration.
- Document the maintenance work. Record the installed model, affected circuit or channel references, and the reason for replacement or inspection. Update the cabinet records and spare-parts information as necessary so future maintenance personnel can trace the component and its associated wiring.
Compatible System Components
| Component Category | Compatibility and Selection Considerations |
|---|---|
| ABB Bailey INFI 90 Control Hardware | Confirm the NRAI02’s use against the specific installed system configuration. Membership in the INFI 90 family alone does not establish compatibility with every module or interface. |
| Analog Input Modules | Verify the exact input-module model and its documented connection requirements before pairing it with the NRAI02. Confirm the supported signal types and channel arrangement. |
| Field Instrumentation | Includes transmitters and other instruments that supply analog measurement signals. Each instrument’s electrical output must match the connected input hardware and system configuration. |
| Field Wiring and Instrument Cables | Conductors must be identified, routed, and connected according to the approved drawings. Check conductor condition and terminal suitability during installation or replacement. |
| Control Cabinet Termination Hardware | Confirm mounting, connection, and wiring arrangements before integrating the NRAI02 into an existing cabinet. |
| INFI 90 System Wiring Documentation | Wiring diagrams, terminal schedules, and equipment manuals are essential for establishing correct terminal assignments and compatibility. |
| Replacement Termination Units | Select by exact part number and documented function. A similar-looking termination component should not be substituted without confirmation of electrical and mechanical compatibility. |
| Maintenance and Diagnostic Equipment | Appropriate test instruments and system diagnostic tools may be used to investigate signal-path problems in accordance with site procedures and equipment instructions. |
Recommended Related Models
| Model or Product Group | Product Description | Relationship |
|---|---|---|
| ABB Bailey NRAI02 | INFI 90 Analog Input Termination Unit | Exact model for identification, replacement planning, and maintenance inventory. |
| ABB Bailey INFI 90 Analog Input Modules | Analog input hardware for compatible INFI 90 configurations | Associated input hardware may use a termination interface, but the exact module pairing must be verified from the system documentation. |
| ABB Bailey INFI 90 Termination Units | Termination components used within compatible control-system installations | Related product category. Confirm each model’s function, terminal arrangement, and compatible hardware before selecting an alternative. |
| ABB Bailey INFI 90 Control System Components | Control-system hardware used in INFI 90 architectures | Relevant when checking the complete installation configuration and determining how the termination unit connects to the broader system. |
| ABB Bailey Field Interface Components | Hardware associated with field signal connections | Potentially related to the signal path; selection depends on the specific field interface and documented wiring arrangement. |
Key Advantages
- Model-specific identification: The NRAI02 designation supports accurate identification in maintenance records and spare-parts inventories.
- Dedicated analog input termination: Provides a defined termination interface for analog circuits in compatible INFI 90 configurations.
- Organized field wiring: Supports structured connection of field conductors to the designated control-system interface.
- Maintenance support: Gives technicians a specific component to inspect when investigating wiring or connection problems.
- System configuration continuity: Helps preserve the existing termination arrangement when the model is confirmed as the correct replacement.
- Traceable component management: Recording the part number and associated circuit information improves replacement planning and maintenance documentation.
- Integration with industrial instrumentation: Supports the physical signal path between field measurement circuits and the designated input hardware.
Technical FAQs
1. What is the ABB Bailey NRAI02 used for?
The ABB Bailey NRAI02 is an INFI 90 Analog Input Termination Unit. It provides a termination interface for analog input wiring in a compatible control-system configuration. Its exact connection points and associated input hardware should be verified using the applicable system documentation.
2. Which input modules are compatible with the NRAI02?
The exact compatible input-module models should be confirmed from the relevant ABB Bailey INFI 90 documentation and the installed system wiring diagrams. The INFI 90 series designation alone is not sufficient to establish compatibility with every analog input module.
3. What should be checked when replacing an NRAI02 termination unit?
Confirm the full model designation, the required termination arrangement, the associated input hardware, and the field wiring assignments. Inspect the terminals and mounting arrangement, label conductors before disconnection, and verify signal operation after the installation has been completed according to site procedures.
4. Can the NRAI02 process or convert analog signals independently?
The NRAI02 is identified as an analog input termination unit. Its documented role is associated with the termination and connection of analog input wiring; signal conversion, processing, scaling, and control functions should not be attributed to it unless the specific technical documentation explicitly identifies those capabilities.