ABB V18345-2020521001 TZIDC Electro-Pneumatic Positioner

Description

Product Introduction

The ABB V18345-2020521001 is an electro-pneumatic positioner. ABB makes this device as part of the TZIDC family. It controls linear or rotary actuators. The positioner receives a 4-20 mA signal. It moves the valve to the correct position.

Model Number Breakdown

• V18345-2020521001 = TZIDC Electro-Pneumatic Positioner
• 2 = Aluminum case, IP65 (NEMA 4X), mechanical position indicator
• 0 = Not used
• 2 = 4-20 mA input, two-wire, FSK for HART communication
• 0 = No explosion protection
• 5 = Double acting, fail freeze on electrical power failure
• 2 = Cable: 1/2-14 NPT thread, Air pipe: 1/4-18 NPT thread
• 1 = Analog position feedback module (4-20 mA)
• 0 = No mechanical kit for digital feedback
• 0 = Not used
• 1 = Standard varnish/coding

Key Features

• Aluminum case with IP65 protection – weather resistant
• 4-20 mA input with HART – easy integration
• Double acting output – controls large actuators
• Fail freeze position – holds last position on power loss
• Analog position feedback – 4-20 mA output
• Mechanical position indicator – local viewing

Technical Specifications

• Brand: ABB
• Model: V18345-2020521001
• Series: TZIDC
• Type: Electro-Pneumatic Positioner
• Weight: 1.7 kg
• Case material: Aluminum, varnished
• Protection rating: IP65 (NEMA 4X)
• Mounting: Linear actuators (DIN/IEC 534 / NAMUR) or rotary actuators (VDI/VDE 3845)

Electrical Input Specifications

• Nominal signal: 4-20 mA (two-wire)
• Maximum current: 25 mA at 30 V
• Minimum start current: 3.8 mA
• Minimum operating current: 3.4 mA (without feedback) or 3.5 mA (with feedback)
• Load voltage at 20 mA: 8.7 V DC
• Impedance at 20 mA: 435 ohms
• Split range: Configurable between 20% and 100% of nominal range
• HART communication: FSK module built-in

Digital Input & Output

• Digital input control voltage: 24 V DC (range 12-30 V DC)
• Logical 0: 0-10 V DC
• Logical 1: 12-30 V DC
• Digital input max current: 4 mA
• Digital output (NAMUR): Supply voltage 5-11 V DC
• Logical 0 output: Current below 1.0 mA
• Logical 1 output: Current above 2.0 mA
• Output direction: Configurable as normally 0 or normally 1

Pneumatic Output Specifications

• Output pressure range: 0-6 bar (0-90 psi)
• Output function: Double acting, fail freeze on power loss
• Air capacity at 1.4 bar (20 psi): 5.0 kg/h = 3.9 Nm³/h = 2.3 scfm
• Air capacity at 6 bar (90 psi): 13 kg/h = 10 Nm³/h = 6.0 scfm
• Booster option: Available on request for higher flow

Travel & Angle Specifications

• Rotary actuators range: 25-120° (optional 270°)
• Linear actuators range: 25-60°
• Shut-off end position 0%: 0-45%
• Shut-off end position 100%: 55-100%

Installation Guidelines

• Mount on linear actuators per DIN/IEC 534 or NAMUR.
• Mount on rotary actuators per VDI/VDE 3845.
• Use 1/2-14 NPT threads for electrical cables.
• Use 1/4-18 NPT threads for air pipes.
• Keep air supply clean and dry.
• Need help? Contact us on WhatsApp +86 158 8020 0923

Debugging & Maintenance

• Check 4-20 mA input signal first.
• Verify air supply pressure between 1.4 and 6 bar.
• Watch the mechanical position indicator for local feedback.
• Use HART communication for remote diagnostics.
• No routine calibration needed under normal use.
• Clean external surfaces with dry cloth only.

Compatibility

• Works with linear actuators from most brands.
• Works with rotary actuators per VDI/VDE 3845.
• HART communication works with any HART master.
• Compatible with 4-20 mA control systems.
• Also works alongside 3300 XL 11 mm Proximity Probes for complete machine monitoring.

Certifications

• IP65 (NEMA 4X) environmental protection.
• No explosion protection on this model (option 0).
• Meets industrial standards for electro-pneumatic positioners.

Packing List

• One ABB V18345-2020521001 positioner
• Mechanical position indicator (built-in)
• Analog position feedback module (built-in)
• Mounting kit not included – order separately

Warranty & Shipping

• 12-month warranty against defects
• Ships via FedEx, UPS, or DHL worldwide

Typical Applications & Diagnostic Ability

• Control valves in chemical plants
• Steam turbine valve positioning
• Pump recirculation valves
• Diagnose via HART communication
• Monitor position feedback in real time
• Detect valve sticking or air supply issues

Professional FAQ

• What does “fail freeze” mean on this positioner? The actuator holds its last position when electrical power fails. Air pressure stays trapped.
• Can I use this positioner with single acting actuators? No. This is double acting only (option 5). Choose a different version for single acting.
• Does this model work with HART handheld communicators? Yes. The FSK module supports standard HART communication.
• Experience: My positioner vibrates and hunts near setpoint. Check air supply pressure first. Then adjust the dead band settings using HART.
• Selection guide: Should I choose fail freeze or fail safe? Pick fail freeze to hold position on power loss. Pick fail safe to vent air and move to a safe position.

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