C&S ELECTRIC EC-RXA-V2, AMF RELAY DISPLAY OF GENERATOR PARAMETERS CONTROLLER 15:51

The C&S Electric EC-RXA-V2 is a sophisticated, microprocessor-based Automatic Mains Failure (AMF) controller and generator monitoring relay. It is a core component of the SEO (Smart Engine Operator) product series, designed to automate and supervise standby power generation systems.

Its primary function is to ensure a seamless and automatic transition from the mains (utility) power supply to an on-site generator set in the event of a power outage, and to switch back once mains power is restored.

Primary Function: Automatic Mains Failure (AMF)

The “AMF Relay” in its name signifies its core purpose:

1. Monitor: Continuously monitors the health of the mains supply (voltage, frequency).

2. Detect Failure: Automatically detects a mains failure (blackout) or significant deviation from acceptable parameters.

3. Initiate Start: Sends a start signal to the generator engine controller after a pre-set time delay (to avoid nuisance starts from short outages).

4. Transfer Load: Once the generator is running stably at the correct voltage and frequency, it commands the Automatic Transfer Switch (ATS) to disconnect from the mains and connect the load to the generator.

5. Monitor Return & Retransfer: Continuously monitors the mains supply for its restoration. Once mains power is stable for a pre-set time, it commands the ATS to switch the load back to the mains.

6. Cool Down & Stop: Initiates a generator cool-down run (to stabilize engine temperatures) before sending a stop signal.

Key Features and Capabilities

• Advanced Display: Features a clear, backlit LCD display (often a dot-matrix type) that provides a comprehensive, real-time view of all critical generator and mains parameters.

• Comprehensive Parameter Monitoring & Display:

  • Generator Parameters: 3-Phase Voltage (L-L, L-N), Current, Frequency, Power (kW), Power Factor (PF), KVA, KWH, and Engine parameters like Oil Pressure, Coolant Temperature, Engine Speed (RPM), and Battery Voltage.

  • Mains Parameters: 3-Phase Voltage, Frequency.

• Integrated Protection: Provides protection alarms and shutdowns for the generator engine, including:

  • Low Oil Pressure

  • High Coolant Temperature

  • Over-speed / Under-speed

  • Over-crank (failure to start)

  • Low Battery Voltage

• User-Friendly Interface: Equipped with push buttons for easy navigation through menus for parameter setting, viewing historical data (like run hours, number of starts), and testing.

• Programmable Logic: Highly configurable settings for start/stop delays, transfer/retransfer delays, voltage and frequency thresholds, and protection setpoints.

• Communication Capabilities: Typically comes with built-in communication ports (like RS-485) supporting standard protocols (e.g., Modbus RTU). This allows for integration into Building Management Systems (BMS) or remote monitoring solutions.

• Test Functions: Allows for manual testing of the entire system without a real power failure (Manual, Weekly, Monthly auto-test features).

• Event Logging: Records a history of alarms and key events (e.g., “Mains Fail”, “Generator Start”, “Overload Warning”), aiding in troubleshooting and maintenance.