SIEMENS 6XV1871-2F Programmable controller

Siemens Valve Positioners Overview

Siemens offers a comprehensive range of valve positioners designed for precise and reliable control of pneumatic and electric actuators, ensuring accurate positioning of control valves in various industrial processes. These positioners are critical components in automation systems, enabling efficient and optimized flow control.

Product Detailed Description

• Function:

• Receives a control signal (e.g., 4-20 mA, PROFIBUS, PROFINET) from a control system (DCS, PLC).

• Compares the received signal with the actual valve position (feedback).

• Actuates the valve actuator (pneumatic or electric) to move the valve to the desired position.

• Provides precise control of valve opening/closing, ensuring accurate flow regulation.

• Many advanced models offer diagnostic functions, partial stroke testing (PST), and local operation capabilities.

• Features:

• Digital control for high accuracy.

• Integrated intelligence and communication.

• Easy setup and parameterization.

• Modular design, easy to mount on various actuators.

• Automatic commissioning/self-tuning.

• Extensive diagnostic capabilities for predictive maintenance.

• Available with various communication protocols (HART, PROFIBUS PA, Foundation Fieldbus).

• Can be operated locally via pushbuttons and display.

• Robust aluminum or stainless steel housing options.

• Electropneumatic Positioners (e.g., SIPART PS2 series): Convert an electrical input signal into a pneumatic output pressure to control pneumatic actuators.

• Electric Positioners (e.g., SIPART PS100 series): Designed for direct control of electric actuators.

• High Performance and Reliability: Designed for harsh industrial environments, ensuring long-term stable operation.

• User-Friendly Interface: Local display and pushbuttons for easy commissioning and status monitoring.

Product Parameters

Given the wide range of Siemens valve positioners, specific parameters vary by model. Here are some typical parameters:

• Input Signal:

• Analog: 4-20 mA (with/without HART protocol)

• Digital Fieldbus: PROFIBUS PA, Foundation Fieldbus, PROFINET (for electric positioners)

• Output Signal (for Electropneumatic):

• Pneumatic pressure to actuator (e.g., 0-6 bar, 0-10 bar).

• Power Supply:

• Typically 24 V DC (for analog and fieldbus versions)

• Actuator Type:

• Linear actuators (globe valves, gate valves)

• Rotary actuators (ball valves, butterfly valves)

• Stroke/Rotation Range:

• Configurable based on actuator type and application (e.g., 3 mm to 200 mm for linear, 0 to 90 degrees for rotary).

• Accuracy:

• Typically < 0.2% of full scale (highly precise).

• Protection Class (IP):

• Typically IP66 / IP67

• Ambient Temperature:

• Operating range: e.g., -30 °C to +80 °C (or wider for specific models).

• Certifications:

• ATEX, IECEx (for hazardous areas), SIL (Safety Integrity Level) ratings (e.g., SIL 2/3), CE, EAC, etc.

• Diagnostics:

• Advanced diagnostics for valve performance, friction, sticking, etc.

• Local Display:

• LCD or OLED display with multi-language support.

• Material:

• Aluminum housing, stainless steel housing (for specific models).

Product Advantages

• High Control Accuracy: Ensures precise and stable valve positioning, leading to optimal process control and product quality.

• Enhanced Reliability and Robustness: Built to withstand harsh industrial environments, offering long service life and minimizing downtime.

• Advanced Diagnostics: Predictive maintenance capabilities reduce unplanned shutdowns and lower maintenance costs. Features like partial stroke testing (PST) allow for testing safety instrumented functions during operation.

• Easy Commissioning and Operation: Automatic commissioning, self-tuning functions, and user-friendly interfaces simplify setup and reduce installation time.

• Versatile Communication Options: Supports standard analog signals and various digital fieldbus protocols, ensuring seamless integration into diverse control systems.

• Safety Certifications (SIL): Many models are certified for use in safety instrumented systems, enhancing overall plant safety.

• Energy Efficiency: Optimizes valve movement, potentially reducing air consumption for pneumatic actuators.

• Global Service and Support: Backed by Siemens' worldwide service network.

Precautions

• Correct Selection: Choose the appropriate positioner based on the actuator type (pneumatic/electric), valve size, process media, required accuracy, communication protocol, and hazardous area classifications.

• Proper Installation: Follow Siemens' detailed installation instructions, ensuring correct mounting on the actuator, proper pneumatic/electrical connections, and secure fastening. Incorrect installation can lead to inaccurate control or damage.

• Calibration and Commissioning: Perform the automatic commissioning and calibration procedures as described in the manual to ensure optimal performance. Manual adjustments may be required for specific applications.

• Power Supply: Ensure the power supply meets the specified voltage and current requirements.

• Pneumatic Supply (for Electropneumatic): Ensure clean, dry instrument air supply within the specified pressure range. Contaminated air can damage internal components.

• Environmental Conditions: Operate the positioner within its specified ambient temperature, humidity, and vibration limits. Protect from excessive dust, moisture, and direct sunlight.

• Firmware and Software: Keep the device firmware updated and use the correct engineering software (e.g., SIMATIC PDM) for configuration and diagnostics.

• Safety Regulations: Adhere to all relevant safety regulations and guidelines, especially when working with devices in hazardous areas or in safety-instrumented systems.

Product Applications

Siemens valve positioners are widely used across various industries for precise control of final control elements:

• Oil & Gas:

• Flow control in pipelines, refineries, and offshore platforms.

• Control of wellhead valves, compressor stations.

• Chemical & Petrochemical:

• Reactors, distillation columns, heat exchangers, where precise temperature and flow control are crucial.

• Safety instrumented functions (SIF) applications.

• Power Generation:

• Boiler feedwater control, steam turbine control, cooling water systems.

• Flue gas desulfurization (FGD) systems.

• Water & Wastewater Treatment:

• Flow regulation in pumping stations, filtration, and distribution networks.

• Pharmaceutical & Biotech:

• Precise flow control in sterile processes, fermentation, and mixing.

• Food & Beverage:

• Temperature and flow control in pasteurization, brewing, and filling lines.

• Pulp & Paper:

• Stock preparation, pulp washing, drying processes.

• HVAC (Heating, Ventilation, and Air Conditioning):

• Controlling valves in large building management systems for temperature and humidity regulation.

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