ACE919CA SCHNEIDER

ACE919CA SCHNEIDER Input module

Brand：SCHNEIDER Model number：ACE919CA

Country of origin: France Product weight：0.55kg

HS code：853710119

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Product Details：

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The ACE919CA is a RS-485 interface specifically engineered for Sepam series 20, 40, and 80 protection relays. Its primary function is to enable the connection of these relays to a communication network using the Modbus RTU protocol. The "CA" designation indicates that this module is designed for AC/DC power supply flexibility, allowing it to be powered by the same auxiliary sources used for the relays themselves. It provides high-level electrical isolation between the communication network and the relay circuitry, which is essential for protecting sensitive electronics against common-mode noise and surges typically found in power distribution environments.

Product Parameters

Product Range: Sepam series (Series 20, Series 40, Series 80)
Communication Interface: 2-wire RS-485 (half-duplex)
Protocol: Modbus RTU
Auxiliary Power Supply: 24 VDC to 250 VDC or 110 VAC to 240 VAC
Galvanic Isolation: $2000 \text{ Vrms}$ for 1 minute between the communication port and power supply/relay interface
Mounting: Standard $35 \text{ mm}$ DIN rail mounting or direct attachment depending on the Sepam base version
Connection Type: Screw-clamp terminals for RS-485 and power supply; 9-pin Sub-D connector for the Sepam base connection
Transmission Rate: Configurable via Sepam settings, typically up to $38.4 \text{ kbps}$
Internal Termination: Includes a switchable line termination resistor ( $120 \text{ \Omega}$ )

Product Advantages

A major advantage of the ACE919CA is its Universal Power Supply, which simplifies inventory management and installation since it can be integrated into virtually any auxiliary power scheme. The module provides Superior Noise Immunity through its high-voltage galvanic isolation, ensuring that communication remains stable even during high-voltage faults or heavy switching in the substation.

The Compact DIN Rail Mounting makes it easy to install within standard protection cabinets without requiring significant space. Additionally, the Seamless Integration with the Sepam series allows for "plug-and-play" functionality; once the hardware is connected, the relay's diagnostic data, measurements, and fault logs become immediately accessible to the SCADA system without complex gateway programming.

Important Considerations and Precautions

When installing the ACE919CA, it is vital to observe the Correct Polarity of the RS-485 Lines (A and B). Swapping these lines is a common installation error that prevents all devices on the segment from communicating. Because RS-485 is a bus topology, you must ensure that the Termination Resistor is enabled only on the physical end-of-line devices to prevent signal reflections.

Another critical precaution is to Avoid Routing Communication Cables in the same tray as high-voltage power cables to minimize induced electromagnetic interference. Before powering up, double-check that the Auxiliary Voltage matches the wide-range limits of the module to avoid damage. Finally, ensure that the CCA612 or CCA613 connection cord (linking the ACE919CA to the Sepam relay) is securely seated and not under mechanical tension, as intermittent connections here can lead to frequent communication timeouts in the SCADA system.

Product Applications

The Schneider ACE919CA is an essential component in modern digitized power systems where relay data must be centralized.

Substation Automation: Connecting multiple Sepam relays to a central Gateway or RTU for remote monitoring of voltage, current, and trip statuses.
Industrial Power Management: Integrating protective relays into a Plant Management System (PMS) to monitor energy consumption and peak demand.
Renewable Energy Plants: Linking wind turbine or solar farm protection units to a central SCADA for real-time grid compliance monitoring.
Data Centers: Ensuring high-reliability monitoring of medium-voltage switchgear to prevent unplanned outages.
Oil and Gas Facilities: Providing isolated communication for relays located in hazardous areas where electrical separation is a safety requirement.

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