Basler Electric CEM-2020 Contact Expansion Module
The Basler Electric CEM-2020 is a compact contact expansion module that adds 20 digital inputs and 20 relay outputs to a generator control or protection system. It is designed to interface with Basler Electric digital relays and controllers, such as the DECS series or BE1-700, providing additional I/O capacity for monitoring more circuit breakers, auxiliary contacts, and controlling external devices. The CEM-2020 communicates with the host device via a high-speed serial link, reducing wiring complexity and panel space.
Key Features
20 optically isolated digital inputs for status monitoring
20 Form C relay outputs with high current rating
High-speed communication to host controller
LED status indicators for each input and output
Compact DIN-rail or panel mounting
Wide auxiliary power supply range
Built-in self-diagnostics
Hot-swappable for maintenance without system shutdown
Technical Specifications
The CEM-2020 operates on a 24 to 125 VDC or 120 to 240 VAC supply. Digital inputs are rated for 24 VDC or 120 VAC, with configurable wetting voltage. Relay outputs are rated at 5 A, 250 VAC/30 VDC. The communication interface is RS-485 using Modbus protocol. Response time is typically less than 10 milliseconds. Operating temperature range is -20 to +70 degrees Celsius. The module is housed in a rugged metal enclosure with IP20 rating.
Integration and Configuration
The CEM-2020 is configured through the host controller's software, where each input and output can be mapped to specific logical functions. Inputs can be used to monitor breaker positions, selector switch positions, or protection relay contacts. Outputs can control trip coils, alarm lights, fans, or other auxiliary equipment. The module automatically reports status changes to the host, enabling rapid response to events.
Applications
This expansion module is ideal for large generator control panels that require extensive I/O. It is also used in retrofits where adding new I/O points is needed without redesigning the entire control system. Applications include power plants, substations, and industrial automation systems requiring distributed I/O.
Reliability and Maintenance
The CEM-2020 is designed for continuous operation with high MTBF. It includes surge protection on all inputs and outputs. The module has no user-serviceable parts; however, front-panel LEDs provide quick status indication for troubleshooting. Periodic inspection is recommended to ensure proper connections.
Compliance
The module meets CE and FCC requirements for electromagnetic compatibility and safety. It is RoHS compliant and manufactured under Basler Electric's quality management system.
Conclusion
Basler Electric CEM-2020 contact expansion module provides a cost-effective and flexible solution for expanding I/O capacity in generator control systems. Its high channel count, robust design, and easy integration make it a valuable addition to any digital protection and control architecture.
