V18345-1010521001 ABB TZIDC Electro-Pneumatic Valve Positioner

Model: V18345-1010521001

Brand: ABB

Product Type: Intelligent Electro-Pneumatic Valve Positioner

Product Family: TZIDC

Positioner Designation: V18345

Input Signal: 4–20 mA DC, two-wire

Input / Communication Interface: LKS adapter connection

Enclosure: Varnished aluminum

Enclosure Protection: IP65 / NEMA 4X

Explosion Protection: None

Pneumatic Action: Double-acting

Failure Response: Fail Freeze

Electrical Connection: 1/2-14 NPT

Pneumatic Connection: 1/4-18 NPT

Analog Position Feedback: 4–20 mA, two-wire

Mechanical Position Indicator: Not included

Digital Position Feedback: Not included

Standard Design: Varnish / coding version 1

Product Introduction

 

The ABB V18345-1010521001 is a configured version of the TZIDC intelligent electro-pneumatic positioner. It converts an electrical control signal into a proportional pneumatic output, adjusting a pneumatic actuator to position a control valve according to the required setpoint.

 

This particular configuration combines a 4–20 mA two-wire input with a double-acting pneumatic output. Its fail-freeze arrangement is an important distinction: when electrical power fails, the pneumatic outputs are closed to hold the actuator and valve at their current position, rather than deliberately moving the valve to a predetermined open or closed position.

 

The unit also includes an analog position feedback module with a 4–20 mA signal output. This allows the actual valve position to be transmitted to a compatible control or monitoring system.

 

• Electro-Pneumatic Signal Conversion: Converts the incoming 4–20 mA command into pneumatic pressure adjustments for actuator movement.
• Valve Position Regulation: Uses internal position control to adjust actuator movement in response to the commanded setpoint.
• Double-Acting Actuator Control: Controls the pneumatic outputs required for actuators that use air pressure in both directions.
• Fail-Freeze Operation: Holds the current actuator position when electrical power fails by closing the pneumatic outputs.
• Analog Position Feedback: Provides a separate 4–20 mA signal representing actual valve position.
• Automatic Commissioning: The TZIDC platform supports automatic adjustment to the connected actuator, reducing manual parameter-setting requirements.
• Local Configuration and Monitoring: The built-in operator panel provides access to device configuration and operating information.

The V18345-1010521001 is intended for pneumatic control-valve installations where an electrical control signal must be translated into accurate mechanical valve movement.

• Process Flow Regulation: Controls pneumatic valves used to regulate liquid or gas flow in process pipelines.
• Pressure Control Systems: Positions control valves in pressure-regulating loops.
• Industrial Temperature Control: Operates pneumatic valves used to regulate heating or cooling media.
• Chemical and Process Plants: Supports automated valve positioning in process equipment where 4–20 mA control is used.
• Water and Utility Systems: Can be applied to compatible pneumatic valves in water treatment and industrial utility installations.
• Existing TZIDC Installations: Suitable for maintenance or replacement where the complete configuration matches the installed positioner and actuator arrangement.

The full ordering code identifies the specific hardware and functional arrangement. The important configuration details for this version are:

When replacing an installed unit, pay particular attention to the pneumatic action and failure response. A double-acting fail-freeze positioner is not automatically interchangeable with a single-acting or fail-safe version.

Also verify the actuator mounting arrangement, air connections, electrical cable entry and feedback wiring. The IP65 enclosure rating does not mean that every mounting or connection arrangement will provide the same protection after installation.

What does ABB V18345-1010521001 control?

It controls the position of a compatible pneumatic actuator and its connected control valve using a 4–20 mA electrical command.

What does Fail Freeze mean on this model?

When electrical power fails, the pneumatic outputs close, holding the actuator and valve at their current position. If the compressed-air supply itself fails, the actuator may depressurize; the final valve response depends on the actuator design.

Does this version provide position feedback?

Yes. It includes an analog feedback module with a 4–20 mA two-wire output.

Does it have a mechanical position indicator?

No. The specified configuration does not include the optional mechanical position indicator.

Is this model suitable for hazardous areas?

This particular ordering code specifies no explosion-protection option. It should not be selected for a hazardous-area installation on the assumption that other TZIDC variants' certifications apply.

What should be checked before ordering a replacement?

Match the complete model code, input signal, pneumatic action, failure response, connection threads, analog feedback and actuator mounting arrangement.

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