What the ABB V18345-1010251001 Positioner Delivers
The ABB V18345-1010251001 is a TZIDC-120 intelligent positioner with a 4...20 mA two-wire input and a single-acting fail-freeze output. Its aluminium case carries IP 65 protection, so the unit suits linear actuators to DIN/IEC 534 / NAMUR and rotary actuators to VDI/VDE 3845.
From a maintenance standpoint, the design prioritises stable control and straightforward service access. The indicator and operator panel allow local configuration, while the plug-in analog position feedback module supports condition monitoring without extra wiring. Because the A/D conversion resolves more than 4000 steps, small setpoint changes translate into precise valve movement.
Key Specifications and Control Behaviour
- Input signal: 4...20 mA, two-wire, with connector plug for LKS adapter.
- Output action: Single acting, fail freeze on electrical failure.
- Supply pressure: 1.4...6 bar (20...90 psi).
- Air consumption: Less than 0.03 kg/h / 0.015 scfm, independent of supply pressure.
- Characteristic curves: Linear or equal percentage 1:25, 1:50, 25:1, 50:1, plus 20-point free configuration.
- Connections: Cable thread M20 x 1.5; air pipe thread 1/4-18 NPT.
- Resolution: More than 4000 steps at a 20 msec sample rate.
- Ambient temperature influence: ≤ 0.5 % per 10 °C change.
The fail-freeze output holds the last position when the electrical signal is lost. This behaviour supports safe process shutdowns where a defined valve stroke is not desired.
Reliability and Serviceability in the Field
Vibration influence stays within ±1 % up to 10 g and 80 Hz, and mounting orientation has no effect on performance. These traits simplify installation on skids and near rotating equipment. Seismic requirements meet DIN/IEC 68-3-3 Class III for strong and strongest earthquakes, which adds confidence in geologically active plants.
For routine maintenance, inspect the air supply for moisture and particulates. The low air consumption reduces demand on the compressor, yet clean supply pressure remains essential. Verify the cable gland at M20 x 1.5 and the 1/4-18 NPT air connection for tightness during scheduled checks. Because the positioner is configurable, record the characteristic curve and tolerance band settings for each valve. This record shortens troubleshooting if a replacement becomes necessary.
Integration and Commissioning Notes
The two-wire 4...20 mA input connects directly to standard control loops. Configuration occurs through the indicator and operator panel, with direct action mapping 4...20 mA to 0...100 % position and reverse action mapping 20...4 mA to 0...100 %. The plug-in analog position feedback module provides a 4...20 mA signal for remote position monitoring. Always confirm that supply pressure does not exceed the actuator's maximum operating pressure.
Availability & Condition at AutoDCSTech
| Part Number | V18345-1010251001 |
|---|---|
| Availability | In Stock |
| Condition | New |
| Warranty | One Year |
| Origin | Switzerland |
