BECKHOFF KL2712 KL Series Bus Terminal

Product Overview

The KL2712 (KL2712) is a specialized 2-channel Triac output terminal from the Beckhoff KL series, engineered for the direct switching of AC loads up to 230 V. This terminal is specifically optimized for applications involving ohmic and inductive loads, with a unique capability to support motor reversing, making it the industry-standard solution for controlling AC blinds and shutter actuators. By integrating power switching and control logic into a compact DIN-rail mounted module, the KL2712 provides a robust, maintenance-free alternative to traditional electromagnetic relays, effectively eliminating mechanical wear and extending the operational lifespan of facility automation systems.

Technical Configuration

The KL2712 utilizes high-speed Triac technology to manage AC voltages ranging from 12 V to 230 V. With a nominal output current capacity of up to 0.5 A per channel and significant peak current tolerance, the module is well-suited for starting inductive loads such as AC motors. The terminal features robust electrical isolation, providing 3750 V AC dielectric strength to ensure safety in high-voltage control environments. Configuration is simplified through an address-free design, allowing for rapid field installation and integration into existing Beckhoff Bus Terminal nodes without the need for complex programming or physical DIP switch adjustments.

Technical Specifications

FAQs

Can the KL2712 be used to control standard LED lighting?

While the KL2712 can switch AC loads, ensure your LED lighting has a sufficient load profile. Due to the leakage current of 0.8 to 1.5 mA in the "OFF" state, some low-power LED lamps may exhibit faint glowing or flickering.

How does the motor reversing feature function?

The module is internally configured to allow safe switching for motor-driven applications like blinds. By controlling the two channels, the system can manage the forward and reverse directions of an AC motor, provided the motor wiring is correctly phased to the terminal outputs.

Is this terminal suitable for use in hazardous areas?

Yes, the KL2712 carries both ATEX and IECEx certifications (Ex ec IIC T4 Gc), making it suitable for deployment in Zone 2 hazardous locations.

Installation and Operational Recommendations

• Inductive Load Considerations: When switching inductive loads, verify that the load does not cause excessive voltage spikes that exceed the internal surge voltage protection (> 275 V AC). For very high-inductance motors, external transient suppression may be required to protect the Triac circuitry.
• Leakage Current Management: Be aware of the leakage current (typ. 0.8 mA). When designing circuits with multiple terminals in parallel or with sensitive electronic loads, account for this current to prevent unintended behavior in the powered devices.
• Thermal Dissipation: Although the terminal is compact, ensure adequate cabinet ventilation, especially if multiple KL2712 modules are mounted side-by-side and operating at or near the 0.5 A current capacity. Consistent airflow ensures the components operate within the rated temperature range, maximizing the MTBF (Mean Time Between Failures).