Product Overview
When valve positioning accuracy and process uptime are critical, the ABB V18345-2020521001 Electro-Pneumatic Positioner delivers reliable performance. This TZIDC series positioner is built for maintenance engineers who value straightforward setup, robust construction, and easy serviceability. With an aluminum case rated IP 65 (NEMA 4X), it withstands harsh industrial environments while providing precise control for both linear and rotary actuators.
Technical Specifications Breakdown
The V18345-2020521001 operates on a two-wire 4...20 mA input signal with a nominal range of 4...20 mA. It supports split range configuration between 20% and 100% of the nominal range, giving flexibility for various process requirements. The input module includes a FSK module for HART communication, enabling remote configuration and diagnostics. For digital input, the control voltage is 24 V DC (12...30 V DC), with logical "0" at 0...10 V DC and logical "1" at 12...30 V DC, drawing a maximum of 4 mA. The digital output follows NAMUR (DIN 19234) standards: supply voltage 5...11 V DC, with current 2.0 mA for logical "1", both configurable.
Output range is 0...6 bar (0...90 psi), with air capacity at 1.4 bar supply of 5.0 kg/h (3.9 Nm³/h, 2.3 scfm) and at 6 bar supply of 13 kg/h (10 Nm³/h, 6.0 scfm). The positioner supports double-acting actuators with fail freeze in case of electrical power failure. Shut-off values are adjustable: end position 0 % = 0...45 % and end position 100 % = 55...100 %. For rotary actuators, the angle of rotation range is 25...120° (optionally 270°), and for linear actuators, 25...60°. Weight is 1.7 kg.
Industry Applications
This positioner excels in applications requiring precise valve positioning in chemical processing, oil and gas, power generation, and water treatment. The double-acting fail freeze feature ensures the actuator holds its last position during power loss, critical for safety-instrumented functions. Maintenance engineers appreciate the robust aluminum housing and IP 65 rating, which reduce downtime from environmental exposure. The HART communication simplifies loop checks and remote troubleshooting, aligning with reliability-focused maintenance programs.
Installation & Setup Guidance
Mount the V18345-2020521001 to linear actuators per DIN/IEC 534/NAMUR or to rotary actuators per VDI/VDE 3845. Connections include cable thread 1/2-14 NPT and air pipe thread 1/4-18 NPT. For setup, configure the split range and shut-off values using the HART interface or local controls. Ensure the input signal is within 4...20 mA and the supply air is clean and dry. The mechanical position indicator aids visual confirmation during commissioning.
Maintenance & Reliability
Routine inspection should focus on air supply quality, cable integrity, and the mechanical position indicator. The aluminum case resists corrosion, but periodic cleaning of the air filter (if fitted) is recommended. The plug-in analog position feedback module (4...20 mA) simplifies replacement without rewiring. For long-term reliability, verify that the supply pressure does not exceed 6 bar (90 psi) and that the ambient temperature stays within the unit's operating range. The fail freeze function requires no additional maintenance but should be tested during scheduled shutdowns.
Compatibility & Integration
The V18345-2020521001 integrates with any 4...20 mA control system, including DCS, PLC, and temperature controllers. The HART FSK module allows two-way digital communication over the same wires, compatible with standard HART handhelds or asset management software. The digital output follows NAMUR, making it compatible with most PLC digital input modules. For analog feedback, the plug-in module provides a 4...20 mA signal to the control system.
Selection Guide & Purchasing Advice
Before ordering, verify the actuator type (linear or rotary) and mounting kit requirements. The V18345-2020521001 includes a mechanical position indicator and analog position feedback module. If digital position feedback is needed, an optional mechanical kit (not included) must be ordered separately. Confirm that the input signal is 4...20 mA and that the supply air pressure meets the actuator's requirements. SpareTechPLC stocks this model and can advise on compatible accessories for your specific application.
Frequently Asked Questions
Q: What is the input signal range for the V18345-2020521001?
A: The nominal input signal is 4...20 mA, with a maximum of 25 mA at 30 V. The minimum start current is 3.8 mA.
Q: Does this positioner support HART communication?
A: Yes, the V18345-2020521001 includes a two-wire FSK module for HART communication, allowing remote configuration and diagnostics.
Q: What happens if electrical power is lost?
A: The positioner is configured for double-acting fail freeze, meaning the actuator holds its last position when power is lost.
Q: What is the IP rating of the housing?
A: The aluminum case is rated IP 65 (NEMA 4X), providing protection against dust and water jets.
Q: Can I use this positioner with a rotary actuator?
A: Yes, it supports rotary actuators with an angle of rotation range of 25...120° (optionally up to 270°).
