Pepperl+Fuchs KFD2-SCD-EX1.LK Smart Current Driver

KFD2-SCD-EX1.LK Analog Output Driver | Pepperl+Fuchs

Product Introduction

The Pepperl+Fuchs KFD2-SCD-EX1.LK stands as a high-performance SMART Current Driver specifically crafted for analog output signal transmission. This device accepts a control input and drives a precise 4-20 mA current loop to field actuators, valves, or other I/O devices. As part of the K-System, this unit offers basic insulation according to EN 50178, ensuring safety in industrial environments. Its SMART technology allows for advanced diagnostics and communication, making it more than a simple signal converter. The KFD2-SCD-EX1.LK is the ideal solution for engineers who require a reliable, accurate, and intelligent interface between their control system and field instrumentation.

Technical Specifications and Key Features

This section details the core technical parameters of the Pepperl+Fuchs KFD2-SCD-EX1.LK. The device operates with a rated supply voltage of 20 to 35 V DC. You can connect this power via the Power Rail or terminals 11+ and 12-. The unit consumes 1.3 W of power and loses 1.1 W at 20 mA into a 10 V (500 Ω) load. On the input side, you connect the driver through terminals 7- and 8+, which feature an input resistance greater than 100 kΩ. The voltage drop is approximately 4 V, which translates to an internal resistance of 200 Ω at 20 mA.

Furthermore, the output stage, accessible via terminals 1+ and 2-, delivers the standard 4 to 20 mA current. This output can drive a load ranging from 100 to 700 Ω, providing a voltage of 14 V at 20 mA. The signal type is clearly defined as an analog output, making the KFD2-SCD-EX1.LK a critical component for continuous process control. Additionally, the insulation between input and power supply meets basic insulation standards with a rated insulation voltage of 50 V AC, ensuring operational safety.

Mechanical Data and Environmental Conditions

Mechanically, the KFD2-SCD-EX1.LK features a robust build for demanding industrial use. Its compact housing type B1 measures approximately 2 x 11.5 x 11.5 cm. The unit carries an IP20 degree of protection per IEC 60529:2001, making it suitable for installation in clean control cabinets. Its lightweight design, weighing only 0.1 kg, simplifies handling and installation. You can mount the unit on a 35 mm DIN mounting rail according to EN 60715:2001, which ensures a secure and standardized fit within your cabinet infrastructure.

Installation and Wiring Guidelines

Installing the Pepperl+Fuchs KFD2-SCD-EX1.LK correctly is a simple process. First, snap the unit firmly onto the 35 mm DIN rail. Next, connect the power supply to either the Power Rail or terminals 11+ and 12-. Then, wire the input signal, such as from a PLC or DCS, to terminals 7- and 8+, taking care to observe the correct polarity. Finally, connect the output device to terminals 1+ and 2-. You must consider the wiring resistance in the field, as the input resistance is >100 kΩ only when the field wiring resistance is either less than 50 Ω or greater than 800 Ω at 20 mA. This consideration ensures proper functionality and signal integrity.

Packaging and Logistics

Your purchase of the Pepperl+Fuchs KFD2-SCD-EX1.LK includes the SMART Current Driver unit itself. The package comes with the necessary documentation for quick reference. For your convenience, we ship all orders using premium express courier services such as FedEx, UPS, or DHL. This ensures that your critical components arrive swiftly and safely for your project deployment.

Frequently Asked Questions (FAQ)

1. What is the primary function of the Pepperl+Fuchs KFD2-SCD-EX1.LK?

   • The KFD2-SCD-EX1.LK is a SMART Current Driver that converts a control signal into a 4-20 mA analog output for driving field devices.

2. What is the maximum load resistance I can connect to the KFD2-SCD-EX1.LK?

   • The device can drive a maximum load of 700 Ω while maintaining a 4-20 mA signal.

3. Can the KFD2-SCD-EX1.LK be mounted on a standard DIN rail?

   • Yes, it is designed for fast and secure mounting on a 35 mm DIN rail per EN 60715:2001.

4. What are the power supply requirements for this SMART Current Driver?

   • It requires a DC power supply ranging from 20 to 35 V, which you can connect via terminals or the Power Rail.

5. What is the significance of the "SMART" functionality in this device?

   • The SMART technology allows for enhanced diagnostics and digital communication, providing more insights into the loop's health beyond just the 4-20 mA signal.