YOKOGAWA VI451-10

Description

YOKOGAWA VI451-10 is a voltage-to-current converter or isolator, a signal conditioning module designed to convert a standard DC voltage input signal into an isolated proportional DC current output. This device from Yokogawa is part of their line of DIN-rail mounted signal interfaces, used to ensure compatibility and signal integrity between different types of control system devices. Detailed technical information can be found on the product page: YOKOGAWA VI451-10. The YOKOGAWA VI451-10 reliably translates voltage-based signals into the industry-standard current loop format for robust transmission and control.

Product Description

The YOKOGAWA VI451-10 is a compact, single-channel signal converter. Its primary function is to accept an analog DC voltage input (e.g., 0-10V, 1-5V) and convert it into a precisely proportional, galvanically isolated 4-20 mA output signal. This conversion allows devices that output a voltage signal—such as certain controllers, PLC analog output cards, or measuring instruments—to interface directly with field devices that require a current input, such as chart recorders, indicators, or the I/O cards of a control system that standardize on 4-20 mA. The VI451-10 provides essential isolation between the input and output circuits, breaking ground loops and protecting sensitive equipment from electrical noise, surges, and potential differences. It is a fundamental building block for creating flexible and noise-immune signal chains in industrial automation.

Product Parameters

• Brand and Manufacturer: YOKOGAWA.
• Product Type: Voltage-to-Current (V/I) Converter, Isolator.
• Input Signal: DC Voltage. The “-10” suffix often indicates a specific input range, most commonly 0-10V DC. It may also be configurable for other ranges like 0-5V or 1-5V.
• Output Signal: Isolated 4-20 mA DC two-wire signal.
• Isolation: High-performance galvanic isolation between input, output, and power supply circuits (typically 1500 V AC or higher).
• Accuracy: High accuracy class (e.g., ±0.1% of span).
• Linearity: Excellent linearity across the entire input/output range.
• Load Capacity: The output can drive a maximum load resistance (e.g., 600 Ω) while maintaining the 4-20 mA signal.
• Power Supply: Requires an external power supply, commonly 24V DC.
• Response Time: Fast response suitable for dynamic process signals.
• Ambient Temperature Range: Rated for standard industrial operating temperatures.
• Mounting: Standard DIN-rail mounting (TH35-7.5).

Advantages and Features

The key advantage of the YOKOGAWA VI451-10 is its ability to provide a clean, accurate, and robust interface between different signal standards, leveraging Yokogawa’s expertise in precision signal conditioning. Its robust isolation is critical for eliminating ground loops—a common source of measurement error and instability—and for protecting equipment in different electrical potentials. The module is known for its high reliability, long-term stability, and maintenance-free operation. A significant feature is its simplicity; it performs a single, critical function exceptionally well without requiring complex configuration. The compact DIN-rail design of the YOKOGAWA VI451-10 allows for easy and high-density installation in control panels.

Application Cases in Various Fields

• PLC Interface: Converting a 0-10V analog output from a PLC (e.g., for speed control) into a 4-20 mA signal to drive a variable frequency drive (VFD) that only accepts current input.
• Signal Standardization: Converting the voltage output from a non-standard sensor or analyzer into a standard 4-20 mA signal for input into a Distributed Control System (DCS) or data acquisition system.
• Ground Loop Elimination: Breaking a ground loop between a voltage source device and a current-receiving device located in different parts of a plant with different ground potentials.
• Signal Distribution: Taking one voltage signal and creating an isolated, duplicate 4-20 mA signal to send to a second recording or display device without loading the original source.
• Legacy System Integration: Modernizing a control loop by connecting a new voltage-output controller to existing field devices or chart recorders that operate on a 4-20 mA current loop.

Comparison with Competing Products

Compared to similar V/I converters from manufacturers like Phoenix Contact, Weidmüller, PR electronics, or Moore Industries, the YOKOGAWA VI451-10 is positioned as a high-accuracy, premium solution. While competitors offer functionally identical devices, the VI451-10 often excels in specifications for accuracy, long-term drift, and build quality associated with the Yokogawa brand. It is a strong choice for critical measurement and control points where signal fidelity is paramount. For less critical applications, competitors’ products may offer a cost-effective alternative. The YOKOGAWA VI451-10 is often preferred in installations with other Yokogawa equipment or where the highest signal integrity is required.

Selection Suggestions and Precautions

1. Confirm Input Voltage Range: Verify that the VI451-10 model is specified for your exact input voltage range (e.g., 0-10V, 1-5V). Using a 0-10V unit with a 0-5V signal will result in an incorrect output.
2. Check Output Requirements: Ensure the 4-20 mA output is the correct signal type for your receiving device and that the load resistance of your loop does not exceed the module’s specified maximum.
3. Provide Clean Power: Use a stable, well-filtered 24V DC power supply. Noisy power can affect the converter’s accuracy and performance.
4. Proper Wiring Practices: Use shielded twisted-pair cables for both input and output connections. Connect the shield to ground at one end only, typically at the system side, to prevent ground loops.
5. Calibration Verification: Although highly accurate, verify the input/output relationship during commissioning. Adjust zero and span potentiometers if available on the module.

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