ABB V18345-2017121001 TZIDC Intelligent Electro-Pneumatic Positioner

V18345-2017121001 TZIDC Intelligent Electro-Pneumatic Positioner Architecture

The V18345-2017121001 is an advanced, configurable electro-pneumatic valve controller from the ABB TZIDC Series. Designed for precise positioning of linear and rotary pneumatic actuators, this microprocessor-based instrument receives a standard 4 to 20 mA loop signal and modulates pneumatic output pressure between 0 and 6 bar. Engineered with an aluminum varnished enclosure (IP65 / NEMA 4X), it features an integrated local display and operator panel, ATEX intrinsic safety certification, and a plug-in analog feedback module for demanding process control loops.

Part Number Nomenclature & Configuration Breakdown

• V18345-2017121001 Suffix Tree:
  • Base Series (V18345): TZIDC intelligent electro-pneumatic positioner with local indicator and operator panel.
  • Case & Mounting (2): Varnished aluminum housing, IP65 / NEMA 4X protection, with mechanical position indicator for linear (DIN/IEC 534 / NAMUR) or rotary (VDI/VDE 3845) actuators.
  • Input / Communication (1): 4 to 20 mA two-wire input with connector plug for LKS adaptation tool.
  • Explosion Protection (7): ATEX Ex II 2 G EEx ia II C T6 intrinsic safety rating.
  • Output / Safe Position (1): Single-acting pneumatic output, fail-safe venting on electrical power failure.
  • Connections (2): 1/2-14 NPT electrical conduit thread and 1/4-18 NPT pneumatic air pipe threads.
  • Feedback Option (1): Plug-in module for 4 ... 20 mA two-wire analog position feedback.
  • Digital Feedback Kits (0 & 0): Supplied without optional digital feedback or mechanical limit switch kits.
  • Design Code (1): Standard electrostatic epoxy resin varnish (Black RAL 9005 matte case, Pantone 420 cover).

Comprehensive Technical & Metrology Specifications

Warranty Protection & Global Express Logistics

• 12-Month Hardware Warranty: Every V18345-2017121001 positioner is backed by a comprehensive 12-month warranty covering mechanical integrity, pneumatic block performance, and electronic calibration.
• Expedited Worldwide Dispatch: Fast, secure global shipping via premier logistics partners including FedEx, UPS, and DHL, packaged in shock-absorbing industrial containers.

Engineering FAQ & Application Selection Guide

Q1: How does the single-acting fail-safe function behave during an unexpected plant power outage?

A1: Upon electrical power failure, the internal pneumatic relay exhausts air pressure from the actuator diaphragm (V18345-2017121001 output Y1), allowing the valve spring to drive the valve safely to its mechanical fully open or closed limit.

Q2: What precautions must instrument technicians take when configuring travel limits on high-vibration compressors?

A2: Adjust the dead band parameter between 0.5% and 2.0% to prevent continuous spool hunting caused by compressor harmonic vibrations while maintaining loop control tightness.

Q3: Can the onboard analog feedback module transmit valve position independently to a DCS?

A3: Yes, the integrated plug-in module provides a dedicated two-wire 4 to 20 mA analog signal proportional to actual stem or shaft travel, isolated from the control setpoint loop.

Q4: Why is instrument air quality critical for the internal pilot valves of this positioner?

A4: Micro-nozzle clearances inside the pilot stage require clean, dry, oil-free air (to ISO 8573-1 Class 3 reliability) to prevent particulate clogging and erratic pneumatic modulation.

Q5: How do process engineers select between linear and equal percentage characteristic curves during commissioning?

A5: Select linear curves for standard proportional control valves, or configure equal percentage profiles when managing high-pressure drop liquid services to linearize inherent valve gain.

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