Siemens 3RA2712-1CA00 AS-i Star-Delta Function Module Original Brand New

Overview

The Siemens 3RA2712-1CA00 is a crucial component in modern industrial automation, specifically a SIRIUS function module designed for seamless integration into communication-capable Siemens 3RT20 power contactors (e.g., 3RT20…-….-0CC0). This front-snap-on module provides the necessary control logic and interface for implementing a star-delta (wye-delta) starter directly via the AS-Interface (AS-i) fieldbus system. It features screw terminals for reliable, secure wiring of the control circuit. This module significantly simplifies wiring, reduces panel space, and enhances the diagnostic capabilities of your motor control circuits.

Benefit

• Simplified Installation and Wiring: The front snap-on design allows for quick, tool-free mounting onto the contactor, eliminating extensive control wiring traditionally required for star-delta circuits.
• AS-Interface Integration: Enables direct control and status feedback of the star-delta starter via the AS-i network, offering decentralized intelligence and robust communication.
• Space-Saving Design: Integrates star-delta control logic into a compact function module that mounts directly to the contactor, saving valuable space in control cabinets compared to discrete timer and relay solutions.
• High Reliability: Part of the proven Siemens SIRIUS industrial control system, ensuring long-term operational reliability and performance in demanding industrial environments.
• Compatibility: Specifically designed for use with communication-capable SIRIUS 3RT20 contactors (sizes S00, S0, S2, S3), providing a perfectly coordinated system solution.

Function

The 3RA2712-1CA00 AS-i function module performs the complete control sequence for a star-delta (wye-delta) motor starting circuit. Its primary functions include:

1. AS-i Control Interface: Receives start, stop, and direction commands directly from the AS-i master.
2. Star-Delta Sequencing: Manages the timed switching sequence of the three contactors (main, star, and delta) necessary to initially connect the motor windings in a “star” configuration for reduced starting current, and then switch to a “delta” connection for normal operation.
3. Timing Control: Incorporates the required timing logic for the transition period between star and delta connection.
4. Status Feedback: Transmits the operational status of the starter (e.g., Run, Fault, Star position, Delta position) back to the AS-i master for centralized monitoring and diagnostics.
5. Screw Terminal Connection: Provides secure, standard electrical connection points for the control wiring.

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