ABB V18345 TZIDC Intelligent Electro-Pneumatic Positioner

ABB V18345 is the base ordering code associated with the TZIDC intelligent electro-pneumatic positioner. The TZIDC is a configurable valve positioner designed to control the position of pneumatic linear and rotary actuators in industrial process control systems. ABB documentation identifies V18345 as the main model code and provides a structured ordering system in which additional characters define mounting arrangement, input and communication functions, explosion protection, actuator action, connections, feedback options, and product design configuration. :contentReference[oaicite:1]{index=1}

The TZIDC positioner combines electronic signal processing with pneumatic actuator control. A 4–20 mA control signal can be used as the primary command for valve positioning, while the positioner regulates the pneumatic output according to the required actuator position. Depending on the selected V18345 configuration, HART communication, position feedback and hazardous-area approvals can also be incorporated.

Product Identification

ABB V18345 is not a single fixed configuration in the same way as a complete extended ordering code. It represents the base model of the TZIDC positioner family. ABB’s ordering documentation shows V18345 followed by additional characters that define individual product options. This means that a complete identification should normally include the entire V18345 ordering string rather than stopping at V18345 alone. :contentReference[oaicite:2]{index=2}

• Manufacturer: ABB
• Base product reference: V18345
• Product family: TZIDC
• Product type: Intelligent electro-pneumatic positioner
• Input technology: 4–20 mA two-wire technology
• Configuration: Intelligent and configurable
• Operator interface: Indicator and operator panel
• Actuator compatibility: Linear and rotary actuators
• Linear mounting standard: DIN/IEC 534 and NAMUR
• Rotary mounting standard: VDI/VDE 3845
• Communication options: Configuration-dependent, including HART
• Explosion protection: Configuration-dependent

TZIDC Positioner Function

The principal function of the ABB V18345 TZIDC is to convert an electronic position command into controlled pneumatic actuator movement. In a typical valve control application, the process control system generates a 4–20 mA signal representing the desired valve position. The TZIDC receives this signal and determines the pneumatic output required to move the actuator toward the requested position.

The positioner also uses feedback from the actuator or valve mechanism to determine the actual position. The electronic control system compares the commanded position with the measured position and regulates the pneumatic output accordingly. This closed-loop arrangement allows the valve to follow the requested position rather than relying only on an open-loop pneumatic command.

Because the TZIDC is configurable, the detailed operating behavior depends on the specific V18345 option code and the actuator arrangement connected to the positioner.

4–20 mA Two-Wire Input

The ABB V18345 family is designed around 4–20 mA two-wire input technology. ABB’s technical documentation identifies the basic TZIDC V18345 as an electro-pneumatic positioner for 4–20 mA two-wire applications. :contentReference[oaicite:3]{index=3}

The 4–20 mA signal is widely used in industrial process control because it provides a standardized analog method of transmitting a process command between control equipment and field devices. In a valve positioner application, the signal can represent the required actuator or valve position.

The two-wire configuration combines the signal path and power supply arrangement through the same pair of conductors, depending on the selected electrical configuration. This allows the positioner to be integrated into conventional process-control loops while maintaining a relatively simple field wiring arrangement.

Intelligent Positioning Control

The TZIDC is described by ABB as an intelligent and configurable positioner. Its electronic architecture allows the positioner to process the input command and regulate the pneumatic actuator through an internal control algorithm.

Position control is based on feedback from the mechanical movement of the actuator. When the actual position differs from the requested position, the positioner adjusts its pneumatic output to reduce the difference. This creates a feedback-controlled positioning loop.

The intelligent architecture also allows configuration parameters to be adapted to the actuator and valve application. Depending on the selected model and installed options, the positioner can provide additional diagnostic, communication or feedback functions.

Linear Actuator Installation

ABB documentation specifies V18345 configurations for mounting to linear actuators according to DIN/IEC 534 and NAMUR. These standards are widely associated with industrial control valve and actuator mounting arrangements. :contentReference[oaicite:4]{index=4}

For a linear valve, the actuator typically produces a straight-line mechanical movement that changes the position of the valve stem or related operating element. The positioner monitors this movement and regulates the pneumatic output required to achieve the commanded position.

The mechanical mounting arrangement must correspond to the actuator geometry and selected TZIDC configuration. Correct linkage installation is important because the position feedback system depends on accurate mechanical transmission of the actuator movement.

Rotary Actuator Installation

The V18345 family also supports configurations for rotary actuators according to VDI/VDE 3845. ABB’s ordering documentation specifically lists this mounting standard for TZIDC configurations. :contentReference[oaicite:5]{index=5}

Rotary actuators are commonly used with valves such as ball and butterfly valves, where the valve element rotates through a defined angular range. The positioner controls pneumatic pressure to the actuator so that the required angular position can be reached and maintained.

The mechanical feedback arrangement must be correctly matched to the rotary actuator. The exact mounting hardware depends on the selected V18345 configuration and actuator design.

HART Communication

Selected ABB V18345 configurations include HART communication. ABB documentation identifies ordering variants with a 4–20 mA two-wire input and an FSK module for HART communication. :contentReference[oaicite:6]{index=6}

HART communication allows digital information to be exchanged over the analog current loop. This can provide access to configuration information, operating parameters and diagnostic data while maintaining the underlying 4–20 mA signal architecture.

The exact HART functionality depends on the selected V18345 option configuration. Therefore, the presence of HART should be confirmed from the complete product code rather than inferred from the base V18345 designation alone.

Indicator and Operator Panel

ABB describes the TZIDC V18345 as an intelligent, configurable electro-pneumatic positioner with an indicator and operator panel. The local interface provides a way to interact with the positioner during configuration and operation. :contentReference[oaicite:7]{index=7}

A local indicator can provide useful information about the positioner state and actuator position, while the operator interface can be used for configuration functions supported by the selected product version.

The availability and exact functionality of individual local operating features should be verified against the complete TZIDC configuration and corresponding operating documentation.

Explosion Protection Options

The V18345 ordering system includes several explosion-protection configurations. ABB documentation lists variants associated with ATEX, IECEx, FM/CSA and other certification systems depending on the selected product code. :contentReference[oaicite:8]{index=8}

For example, ABB documentation identifies V18345 configurations with ATEX II 2 G Ex ib IIC T6/T4 Gb and IECEx protection options. The exact certification marking depends on the selected ordering code and product version. :contentReference[oaicite:9]{index=9}

This is particularly important when the positioner is installed in a hazardous area. The complete certification, electrical entity parameters, temperature class and installation conditions must correspond to the intended hazardous-area application.

Pneumatic Actuator Control

The TZIDC controls pneumatic actuator movement by regulating its pneumatic output. Depending on the selected configuration, the positioner can be used with different actuator operating arrangements.

The pneumatic circuit must be connected according to the selected positioner configuration and the requirements of the actuator. Air quality, supply pressure, tubing arrangement and actuator characteristics all influence the behavior of the complete positioning system.

A positioner cannot be evaluated independently from the actuator because the required pneumatic output depends on the actuator volume, spring arrangement, operating direction and valve mechanical characteristics.

Single-Acting and Double-Acting Applications

The ABB V18345 ordering structure includes configurations for different actuator operating arrangements. Product documentation and individual product configurations show both single-acting and double-acting actuator options. :contentReference[oaicite:10]{index=10}

In a single-acting actuator, pneumatic pressure is typically used in one direction while a spring or another mechanical force provides the return movement. In a double-acting actuator, pneumatic pressure is used to control movement in both directions.

The correct positioner configuration must therefore correspond to the actuator type. The complete V18345 ordering code should be checked before installation to determine the intended output and fail-position arrangement.

Fail Position Function

Some V18345 configurations specify the actuator’s safe position in the event of electrical power failure. Product configurations can include single-acting fail-safe or double-acting fail-freeze arrangements. :contentReference[oaicite:11]{index=11}

The fail-position behavior is an important part of process valve design because the valve may need to move to a predetermined state when the control signal or power supply is interrupted.

The appropriate fail position depends on the process safety requirements. The V18345 base designation alone does not identify the fail action, so the complete ordering code and actuator arrangement must be examined.

Position Feedback

The TZIDC family supports optional position-feedback configurations. ABB ordering documentation includes variants with plug-in modules for analog position feedback and other configurations for digital position feedback. :contentReference[oaicite:12]{index=12}

Analog position feedback can provide a 4–20 mA signal representing the measured valve or actuator position. This signal can be returned to a control system for monitoring or process-control purposes.

Digital position feedback configurations can use additional mechanical or switching components depending on the selected option. The precise feedback arrangement must be identified from the complete V18345 ordering code.

Industrial Process Applications

ABB V18345 TZIDC positioners are designed for applications where pneumatic control valves require electronic position regulation. Typical process industries can include chemical processing, oil and gas, power generation, water treatment, pulp and paper, and general industrial process control.

The positioner can be applied to control valves that regulate flow, pressure, temperature or other process variables. The process controller determines the desired valve position, while the TZIDC converts the electrical command into pneumatic actuator movement.

The actual application depends on the valve type, actuator, process conditions, hazardous-area classification and selected positioner configuration.

Electrical and Pneumatic Integration

A complete TZIDC installation combines an electrical control loop with a pneumatic actuator circuit. The electrical side provides the position command and, where applicable, communication or feedback signals. The pneumatic side provides the energy required to move the actuator.

The positioner acts as the interface between these two systems. Its electronic control section processes the electrical command and position feedback, while the pneumatic section regulates the actuator.

Correct installation therefore requires both electrical and pneumatic considerations. Wiring, grounding, signal configuration, air connections and mechanical linkage should all correspond to the selected V18345 variant.

Model Code and Configuration

One of the most important characteristics of ABB V18345 is its configurable ordering structure. ABB documentation shows that individual positions in the ordering code define different characteristics, including case and mounting, input and communication port, explosion protection, output and safe position, connections, feedback modules and design options. :contentReference[oaicite:13]{index=13}

This means that two products beginning with V18345 can have substantially different electrical, mechanical or pneumatic configurations. For technical identification, the complete extended ordering code should therefore be retained whenever it is available.

For example, ABB product documentation identifies V18345-001 as an electro-pneumatic positioner and provides a complete long description for the corresponding configuration. :contentReference[oaicite:14]{index=14}

Maintenance Considerations

Maintenance of an ABB V18345 positioner should consider the electronic, pneumatic and mechanical sections together. The electrical input loop, pneumatic connections, actuator linkage and position feedback mechanism all contribute to the overall positioning performance.

The positioner should be checked for correct signal response, stable pneumatic regulation and accurate position feedback according to the applicable ABB service documentation. Pneumatic tubing and fittings should also be inspected for leakage or mechanical damage.

Where the positioner is installed in a hazardous area, maintenance procedures must additionally comply with the applicable hazardous-area requirements and the certification conditions for the specific product configuration.

Technical Identification

ABB V18345 should be identified using the complete model and ordering code shown on the product identification label. The base code confirms the TZIDC family, while the following characters define the specific configuration.

ABB’s current TZIDC documentation continues to use V18345 as the base model identifier and provides ordering variants for different certifications and functional configurations. :contentReference[oaicite:15]{index=15}

For procurement, maintenance documentation and engineering records, retaining the complete V18345 code is preferable to using only the base reference because the extended code contains important information about the positioner’s mechanical and electrical configuration.

Typical Applications

ABB V18345 TZIDC positioners can be used in applications including:

• Industrial control valves
• Pneumatic linear actuators
• Pneumatic rotary actuators
• Process flow control
• Pressure control systems
• Temperature control loops
• Water and wastewater process systems
• Chemical process equipment
• Power generation process control
• Oil and gas process applications
• General industrial automation

The exact suitability of a particular V18345 unit depends on its complete ordering configuration, actuator type, process requirements and installation environment.

Conclusion

ABB V18345 is the base model designation for the TZIDC intelligent electro-pneumatic positioner. The product is designed to receive a 4–20 mA two-wire control signal and regulate the pneumatic movement of compatible linear or rotary actuators. ABB documentation specifies mounting arrangements based on DIN/IEC 534 and NAMUR for linear actuators and VDI/VDE 3845 for rotary actuators. :contentReference[oaicite:16]{index=16}

The V18345 family provides a broad configuration structure covering communication options such as HART, hazardous-area protection, actuator action, pneumatic connections and position-feedback modules. Because these options are encoded into the extended ordering reference, the complete V18345 product code is important for accurate technical identification.

For industrial process-control applications, ABB V18345 TZIDC provides an integrated interface between electronic control signals and pneumatic valve actuation. Its intelligent positioning architecture allows the commanded position to be compared with actual actuator movement and corrected through regulated pneumatic output, making the TZIDC family suitable for a wide range of automated valve-control systems.