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- NRAO01
- Analog Output Termination Unit
- Sweden (SE)
- 300 × 35 × 120 mm
- 0.82 kg
- Xiamen, China
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Product Overview
The ABB Bailey NRAO01 INFI 90 Analog Output Termination Unit is a termination component used in compatible ABB Bailey INFI 90 distributed control system installations. It provides a designated connection interface for analog output circuits, supporting the wiring between the control system’s output hardware and the associated field devices.
In an industrial process control environment, analog output signals allow a control system to communicate continuously varying commands to field equipment. These commands may be used for applications such as regulating a control valve, adjusting a variable-speed drive reference, or setting the output of another compatible process actuator. The control system generates the required output value, and the associated output hardware delivers the corresponding electrical signal through the configured wiring path.
The NRAO01 is relevant to installations where the analog output wiring must follow a defined termination arrangement. By providing the specified termination point, it helps organize connections between the control-system hardware and field circuits. Correct identification of the termination unit, associated output module, and terminal assignments is necessary to preserve the intended signal path and avoid wiring errors during installation or replacement.
For maintenance teams working with established INFI 90 systems, the NRAO01 model designation is important when identifying replacement hardware. Termination units may share similar physical appearances while serving different signal functions or using different connection arrangements. The full model number should therefore be checked against the equipment documentation before the unit is installed, and the associated output hardware and field wiring must be verified before the system is returned to operation.
Technical Specifications
| Parameter | Specification |
|---|---|
| Brand | ABB Bailey |
| Model Number | NRAO01 |
| Product Series | INFI 90 |
| Product Type | Analog Output Termination Unit |
| Functional Category | Analog output signal termination |
| System Application | Compatible ABB Bailey INFI 90 control systems |
| Primary Function | Provides a termination interface for analog output wiring |
| Signal Direction | Control-system output toward the designated field circuit |
| Connected Equipment | Verify the compatible analog output hardware against system documentation |
| Terminal Assignment | Refer to the applicable wiring diagram and product documentation |
| Output Signal Type | Confirm from the associated output module and system configuration |
| Field Device Compatibility | Determined by the output module, signal requirements, and approved wiring arrangement |
| Installation Environment | Industrial control cabinet or approved equipment installation |
| Maintenance Application | Inspection, replacement, and restoration of compatible analog output termination hardware |
| Dimensions | 300 × 35 × 120 mm |
| Weight | 0.82 kg |
Product Features
- Analog output termination: The NRAO01 provides a designated termination interface for analog output circuits within a compatible INFI 90 installation. It supports the physical wiring arrangement between the associated output hardware and the intended field circuit.
- INFI 90 system integration: The unit is identified as part of the ABB Bailey INFI 90 product family. Its installation must match the control system’s established hardware configuration, including the specified output module, termination arrangement, and field wiring assignments.
- Organized output wiring: A dedicated termination point helps technicians arrange output conductors according to the cabinet wiring plan. Clear identification of output connections can simplify commissioning, circuit tracing, inspection, and later maintenance.
- Support for analog command signals: Analog output circuits are commonly used to communicate continuously varying control commands to compatible field equipment. The NRAO01 supports the termination path for these circuits, while the exact signal range and electrical characteristics depend on the associated output hardware and documented system configuration.
- Interface between control hardware and field circuits: The termination unit forms part of the physical connection between the control system and the devices receiving its output signals. Correct termination is necessary for the intended output wiring arrangement to function as specified.
- Model-specific replacement identification: The NRAO01 designation helps maintenance and procurement personnel identify the required component when an existing termination unit needs replacement. The part number should be verified against the installed equipment and system documentation.
- Support for maintenance and troubleshooting: The termination interface gives technicians a defined point for checking wiring assignments and connection conditions when investigating an abnormal output signal or suspected field-circuit problem.
- Compatibility-focused selection: Output termination components must be matched to the associated control hardware and intended signal path. Verifying the module type, terminal assignment, and output requirements helps prevent incorrect substitutions.
- Support for established control installations: In facilities continuing to operate compatible INFI 90 systems, using the correct termination hardware helps maintain the existing cabinet wiring architecture and documented equipment configuration.
- Improved component traceability: Recording the NRAO01 model in maintenance schedules, equipment lists, and spare-parts inventories helps ensure that future replacement work uses the correct termination unit.
Working Principle
The ABB Bailey NRAO01 functions as a termination interface for analog output circuits in a compatible INFI 90 control-system configuration. The control system determines the output command from its configured control logic, process measurements, operator commands, or other application-specific inputs. The associated analog output hardware generates the corresponding electrical output signal.
That signal is then routed through the designated output connection path toward the field circuit. The NRAO01 provides the termination interface specified for the installation, allowing the output wiring to connect according to the system’s intended arrangement. The field device receives the signal and responds according to its own electrical characteristics and control function.
For example, in a process loop that regulates a valve position, the control system may calculate an output command based on the difference between the measured process value and the desired setpoint. The associated output module produces the required signal, which is routed through the configured termination and field wiring to the compatible valve positioner. The positioner then adjusts the valve according to the received command. The NRAO01 supports the physical output connection path where specified by that system configuration; the actual control calculation and signal generation are performed by the relevant control and output hardware.
The termination unit should not be assumed to generate, scale, isolate, or independently regulate analog output signals unless those functions are explicitly documented for the particular hardware. Its primary role is associated with the termination and connection of the output wiring.
During commissioning and troubleshooting, technicians should verify the output module, field device requirements, terminal assignments, and cable connections. If a field device does not respond as expected, the investigation may include checking the control-system command, output-module status, termination connections, field wiring continuity, and the receiving device. Each part of the signal path must be checked against the applicable equipment documentation.
Role in an ABB Bailey INFI 90 Control Architecture
| System Element | Relationship to the NRAO01 |
|---|---|
| Control Logic | Determines the required output command from process conditions, configured logic, operator inputs, or other application-specific requirements. |
| Analog Output Hardware | Generates the electrical output signal according to the command from the control system. The exact compatible module must be verified from the system documentation. |
| Analog Output Termination | The NRAO01 provides the designated termination interface where specified by the installed INFI 90 configuration. |
| Field Wiring | Carries the output signal from the termination interface to the designated field circuit. Correct conductor identification and routing are necessary to maintain the intended signal path. |
| Control Valves and Actuators | May receive analog commands through a compatible output circuit when the system design specifies such an application. The actual signal requirements depend on the connected device. |
| Variable-Speed Drives | May use analog references to adjust operating parameters when supported by the drive interface and the configured control system. Compatibility must be confirmed before connection. |
| Process Control Loops | Supports the physical output connection path used to communicate controller commands to field equipment. The control calculations are performed by the associated control-system hardware. |
| Operator Monitoring | Correct output wiring helps the control system deliver the intended command to field equipment. Output status and feedback monitoring depend on the wider system configuration. |
| Maintenance and Troubleshooting | Provides an identifiable termination point for checking output wiring and connection conditions when investigating abnormal field-device behavior. |
| Spare Parts Management | Recording the NRAO01 designation helps ensure that replacement termination hardware matches the documented installation. |
Industrial Applications
| Application | Role of the NRAO01 |
|---|---|
| Process Control Systems | Provides the termination interface for analog output circuits in compatible ABB Bailey INFI 90 installations where the system configuration specifies this unit. |
| Control Valve Positioning | Supports the output wiring path to a compatible valve positioner when the configured control loop uses an analog command signal. The signal range and terminal arrangement must be verified against the output hardware and positioner requirements. |
| Flow Regulation | May be used in a control loop where the control system sends an analog command to compatible flow-control equipment. The NRAO01 serves the termination function rather than independently calculating or regulating flow. |
| Pressure Control | Supports the connection path for output signals used by compatible pressure-control equipment, provided the installed system design specifies the required termination arrangement. |
| Temperature Regulation | Can form part of the output wiring arrangement for compatible temperature-control applications, such as systems that send an analog command to a regulating device. The specific application depends on the output module and receiving equipment. |
| Variable-Speed Drive Control | May support the termination of an analog reference circuit routed to a compatible drive when required by the control-system design. The drive’s input requirements and the output module’s electrical characteristics must be checked before connection. |
| Industrial Control Cabinets | Provides a defined termination point for output wiring, helping technicians organize conductors and maintain an identifiable connection layout inside the cabinet. |
| Distributed Control System Maintenance | Allows maintenance personnel to identify and inspect a specific analog output termination component during scheduled maintenance, cabinet refurbishment, or fault investigation. |
| Legacy Control System Support | Helps facilities maintaining compatible INFI 90 installations preserve the existing output wiring architecture when the NRAO01 is confirmed as the correct component. |
| Spare Parts Replacement | Supports model-specific inventory planning for termination hardware used in existing control cabinets. The replacement must match the installed configuration and not be selected solely by product family. |
Installation and Maintenance
- Verify the product identification. Confirm that the component is marked ABB Bailey NRAO01 and that the model matches the installation requirement. Do not substitute another termination unit based solely on similar dimensions, appearance, or a general INFI 90 designation.
- Confirm system compatibility. Review the applicable INFI 90 hardware documentation to establish whether the NRAO01 is specified for the intended application. Identify the associated analog output module and verify the required termination arrangement before starting the installation.
- Review the output wiring diagrams. Obtain the relevant cabinet drawings, terminal schedules, and field connection information. Identify the output channels, terminal assignments, and destination field circuits so that the wiring can be connected according to the approved configuration.
- Follow site isolation procedures. Determine the required maintenance state before disconnecting or replacing the termination unit. Consider the process consequences of interrupting the affected output signals, particularly where the connected equipment controls a valve, actuator, drive, or other process device.
- Inspect the termination unit. Examine the accessible terminals, connector areas, mounting points, and insulating surfaces for visible damage, contamination, corrosion, or signs of overheating. Check the unit before installation and do not use hardware that appears damaged or unsuitable for service.
- Identify and label output conductors. Before disconnecting an existing unit, verify conductor identification against the wiring drawings and label the conductors where necessary. Correct identification helps prevent output channels from being crossed or connected to the wrong field devices during reconnection.
- Verify the output interface requirements. Confirm the associated output module, required signal type, terminal assignment, and field-device input requirements. Do not assume that an analog output termination unit supports every output range or is interchangeable with other termination models.
- Mount the unit in the designated location. Install the NRAO01 using the approved mounting arrangement and verify that it is properly supported. Ensure that the installation does not obstruct adjacent components, wiring ducts, cabinet covers, or access required for future maintenance.
- Reconnect the field wiring. Connect each conductor to its documented terminal and check that the connections are secure. Follow the applicable instructions for conductor preparation and terminal tightening. Do not guess terminal assignments or apply undocumented tightening values.
- Inspect routing and mechanical protection. Confirm that the output conductors follow the approved cabinet wiring route and are not pinched, excessively bent, or placed under tension. Maintain the required separation from other circuits and protect the wiring from sharp edges, heat, and mechanical interference.
- Verify output operation. After completing the wiring checks and following the approved procedure for returning equipment to service, confirm that the associated output channel and field device respond as expected. If the output is abnormal, check the control command, output-module status, terminal connections, field wiring, and receiving-device requirements.
- Document the installation or replacement. Record the NRAO01 model, the associated output channels or field circuits, and the reason for the maintenance work. Update equipment records and spare-parts information so future technicians can identify the installed component and trace the relevant output wiring.
Compatible System Components
| Component Category | Compatibility and Selection Considerations |
|---|---|
| ABB Bailey INFI 90 Control Hardware | Confirm that the NRAO01 is specified for the installed system configuration. The INFI 90 family designation alone does not establish compatibility with every control-system component. |
| Analog Output Modules | Verify the exact output-module model and its documented termination requirements. Confirm the supported output signal characteristics and connection arrangement before installing the NRAO01. |
| Control Valves and Positioners | May be connected through a compatible analog output circuit when specified by the control-system design. Check the field device’s input requirements and the output module’s signal characteristics. |
| Variable-Speed Drives | Some drive configurations accept analog reference signals from control systems. Verify the required input type, signal range, and wiring arrangement before including a drive in the output circuit. |
| Field Actuators and Final Control Elements | Confirm that the receiving device is compatible with the associated output module and configured signal path. The termination unit alone does not establish electrical compatibility with a field device. |
| Field Wiring and Instrument Cables | Conductors must be identified and routed according to the approved drawings. Check conductor condition, terminal suitability, and the connection between the termination unit and the receiving device. |
| Control Cabinet Termination Hardware | Confirm mounting and connection requirements when integrating the NRAO01 into an existing cabinet. Ensure the installed wiring arrangement matches the system documentation. |
| INFI 90 System Wiring Documentation | Wiring diagrams, terminal schedules, and equipment manuals are essential for verifying output-channel assignments and compatible component combinations. |
| Replacement Termination Units | Select by exact model number and documented function. Do not substitute an analog input termination unit or another termination model without verified compatibility. |
| Maintenance and Diagnostic Equipment | Appropriate electrical test instruments and system diagnostic tools may be used to investigate output-circuit problems, following the site’s approved procedures and equipment instructions. |
Recommended Related Models
| Model or Product Group | Product Description | Relationship |
|---|---|---|
| ABB Bailey NRAO01 | INFI 90 Analog Output Termination Unit | Exact model for identification, replacement planning, and maintenance inventory. |
| ABB Bailey NRAI02 | INFI 90 Analog Input Termination Unit | Related INFI 90 termination hardware serving an analog input application. It is not a functional substitute for the NRAO01 because the signal direction and intended application differ. |
| ABB Bailey INFI 90 Analog Output Modules | Analog output hardware for compatible INFI 90 configurations | Associated output hardware may use a termination interface. The exact module and termination pairing must be verified from the system documentation. |
| ABB Bailey INFI 90 Analog Input Modules | Analog input hardware for compatible INFI 90 configurations | Related control-system components used for acquiring field measurements. These modules serve an input function and should not be treated as interchangeable with output hardware. |
| ABB Bailey INFI 90 Termination Units | Termination components used within compatible control-system installations | Related product category. Confirm each unit’s signal function, terminal arrangement, and supported hardware before selecting a replacement. |
| 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 NRAO01 connects to the wider control system. |
Key Advantages
- Dedicated analog output termination: Provides a defined connection interface for analog output wiring in compatible INFI 90 installations.
- Model-specific identification: The NRAO01 designation helps maintenance and procurement teams identify the required termination unit.
- Organized field connections: Supports structured routing and termination of output conductors between control hardware and the designated field circuits.
- Support for control-system maintenance: Gives technicians a specific component to inspect when investigating wiring problems or abnormal output behavior.
- Preservation of existing wiring architecture: Helps maintain the established connection arrangement when the NRAO01 is confirmed as the correct replacement.
- Improved component traceability: Recording the model and associated output circuits supports maintenance records, spare-parts management, and future troubleshooting.
- Integration with process control applications: Supports the physical output signal path used by compatible control systems to command field devices.
- Clear distinction between input and output functions: The NRAO01’s analog output designation helps technicians distinguish it from termination hardware intended for incoming measurement signals.
Technical FAQs
1. What is the ABB Bailey NRAO01 INFI 90 Analog Output Termination Unit used for?
The ABB Bailey NRAO01 is an analog output termination unit used in compatible ABB Bailey INFI 90 control-system installations. It provides the designated termination interface for output wiring between the associated analog output hardware and the intended field circuit. The exact connected equipment and terminal assignments should be verified from the applicable system documentation.
2. Which analog output modules are compatible with the NRAO01?
The exact compatible analog output modules must be identified from the relevant INFI 90 technical documentation and the installed system wiring diagrams. The product-family designation alone is not sufficient to confirm compatibility with every output module. Verify the module model, termination requirements, output signal characteristics, and terminal arrangement before installation.
3. Can the NRAO01 be used as a replacement for the NRAI02 Analog Input Termination Unit?
The NRAO01 and NRAI02 have different stated functions: the NRAO01 is an analog output termination unit, while the NRAI02 is an analog input termination unit. They should not be treated as interchangeable merely because they belong to the same product family or have similar physical specifications. Select the unit specified for the required signal direction and installed hardware configuration.
4. What should be checked if a field device does not respond to an analog output command?
First, verify the control-system command and the status of the associated analog output module. Then check the NRAO01 terminal assignments, connector and conductor condition, field wiring continuity, and the receiving device’s input requirements. Confirm that the installed termination unit matches the approved system configuration before replacing components or changing wiring.