KS2702 | BECKHOFF | 2-Channel Solid State Relay Output Terminal

Product Overview

The KS2702 (KS2702) is a 2-channel digital output terminal designed for the Beckhoff Bus Terminal system, featuring solid state relay (SSR) technology. Configured with two independent make contacts, this terminal is engineered to switch both AC and DC voltages ranging from 0 to 230 V. Because it utilizes electronic switching rather than mechanical contacts, the KS2702 offers significantly faster switch-off times (down to 0.05 ms) and a much higher service life, making it ideal for high-cycle applications such as controlling small solenoids, contactor coils, and signal indicators. The "KS" designation indicates a pluggable wiring level, allowing for rapid module replacement without disconnecting the individual field wires—a critical feature for minimizing downtime in continuous manufacturing processes.

Technical Configuration

The hardware architecture of the KS2702 is optimized for versatile power switching. It supports a steady load current of 0.3 A per channel and can handle brief peak currents up to 1.5 A (100 ms) to accommodate the inrush characteristics of inductive loads. The terminal provides superior electrical safety with 2500 V AC isolation (1 minute) and integrated surge voltage protection that triggers at 400 V AC. For system diagnostics, the module is designed for "plug-and-play" integration into the K-bus process image as two output bits, requiring no manual addressing. Its magnesium and polycarbonate construction is validated by DNV GL and ATEX certifications, ensuring reliable performance in marine, offshore, and hazardous industrial environments.

Technical Specifications

Technical FAQs

What are the advantages of the KS2702 over a standard mechanical relay terminal?

The KS2702 uses electronic switching, which eliminates mechanical wear and contact arcing. This results in an almost unlimited number of switching cycles and much faster switch-off times (0.05 ms compared to several milliseconds for mechanical relays), which is vital for high-speed automated sequences.

Does the KS2702 require a minimum load to function?

No, unlike some AC-only Triac outputs, the solid state technology in the KS2702 can switch very small loads down to the micro-ampere range, making it suitable for interfacing with high-impedance electronic inputs as well as power loads.

What is the benefit of the pluggable wiring level?

The KS-series terminals allow the entire wiring block to be removed from the terminal housing. If a module needs to be replaced, the technician can simply unplug the wires as a single block and plug them into the new module, eliminating the risk of wiring errors and significantly speeding up maintenance.

Engineering & Installation Guide

• Inductive Load Protection: While the terminal is rated for inductive loads and includes 400 V surge protection, switching large inductive loads (like large solenoid valves) can still generate significant heat and EMI. For long-term reliability, it is best practice to install an external RC snubber (for AC) or a freewheeling diode (for DC) directly across the load.

• Thermal Management: With a typical contact resistance of 2.1 Ohms, the terminal generates heat when carrying the maximum 0.3 A current ($P = I^2 \times R$). Ensure the control cabinet has sufficient vertical airflow, especially when multiple KS2702 modules are mounted side-by-side and operating at high duty cycles.

• Wiring and Stripping: Use the spring-actuated terminals for a vibration-proof connection. Strip the wires to exactly 9–10 mm. For stranded wires, the use of ferrules (0.14 to 1.5 mm²) is highly recommended to ensure all strands are securely captured in the pluggable connector.

• Hazardous Area Compliance: For ATEX Zone 2 ("Ex nA") applications, ensure the terminal is installed in an IP54-rated enclosure. The pluggable wiring level must be secured, and the system must be de-energized before removing or inserting the terminal to prevent sparking.