Schneider ACE919CA RS485 Communication Interface Module

Product Detailed Description

The ACE919CA serves two critical roles in a communication network:

1. Network Interface: It connects a master station (central computer) equipped with a standard RS 485 serial port to a 2-wire RS 485 network of Sepam relays.

2. Distributed Power Supply: It provides the necessary 12 V DC or 24 V DC power to drive the communication interfaces of the relays (such as the ACE949-2, ACE959, or ACE969).

The "CA" version is specifically designed to be powered by an AC supply, distinguishing it from the "CC" (DC-powered) model.

Technical Parameters

Product Advantages

• Flow Control-Free: Performs network polarization and impedance matching automatically without requiring manual flow control signals from the master computer.

• Simplified Wiring: By providing a distributed power supply, it eliminates the need for separate power runs to each communication interface module in the chain.

• System Reliability: Enhances signal integrity on long RS 485 buses by ensuring proper line termination and biasing (polarization).

• Galvanic Isolation: Protects the central control equipment from electrical transients or ground loops occurring on the field communication bus.

Important Considerations & Precautions

• Station Limits: When using the ACE919CA for a distributed power supply, the number of connected stations is typically limited to 12 Sepam relays due to voltage drop and power consumption limits.

• Cable Specifications: Use high-quality shielded twisted-pair cables. To ensure electromagnetic compatibility (EMC), the shield must be correctly grounded at both ends.

• Termination: Ensure that impedance matching resistors are only enabled at the two physical ends of the RS 485 bus to prevent signal reflections.

• Voltage Selection: Verify that the output voltage (12V or 24V) matches the requirements of the specific ACE9xx interface modules being used in the network.

Product Applications

The ACE919CA is widely deployed in medium-voltage (MV) and high-voltage (HV) electrical substations:

• Substation Automation: Linking a central SCADA or HMI system to multiple Sepam protection relays for remote monitoring and control.

• Industrial Power Management: Integrating protection relays in large plants (oil & gas, mining, manufacturing) into a unified Modbus or JBus communication network.

• Retrofitting: Adding communication capabilities to existing relay panels where only AC power is readily available for the interface hardware.

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