CAREL RITC400001 I/O Expansion Card
The CAREL RITC400001 is a multifunction expansion card designed for use with CAREL programmable controllers in HVAC and refrigeration applications. It extends the I/O capacity of the master controller, allowing more sensors, actuators, and communication interfaces to be integrated into a single control system.
Hardware Configuration
The board features 8 digital inputs (24 V AC/DC), 4 analog inputs (configurable for NTC, PT1000, 0-10 V, or 4-20 mA signals), and 6 relay outputs (5 A at 250 V AC). Additionally, it provides 2 analog outputs (0-10 V) for modulating valves or fans. A dedicated RS-485 port supports Modbus RTU communication for field device integration. The card is powered directly from the backplane of the host controller, consuming 3 W typical.
Compatibility and Integration
The RITC400001 is compatible with CAREL pCO series, pCO5, and pCOsistema families. When installed, it is automatically recognized by the controller’s firmware, and the additional I/O points become available in the programming environment (CAREL c.Suite or Easy Tools). Up to 3 such cards can be daisy-chained to one master controller, enabling up to 24 additional I/O points per system.
Environmental and Electrical Specifications
Operating temperature: -10°C to 60°C. Storage temperature: -20°C to 70°C. Relative humidity: 10% to 90% non-condensing. Protection class: IP20. The card meets CE and UL 60730 standards. Isolation between low-voltage and high-voltage sections is rated at 3 kV. Vibration resistance: 1 g (10–150 Hz).
Typical Applications
Common uses include rooftop HVAC units, chiller plant management, cold room monitoring, and supermarket refrigeration racks. The analog inputs can directly read temperature and pressure transducers, while relay outputs drive contactors, solenoid valves, and alarm beacons. The Modbus port allows the CAREL controller to act as a gateway to building management systems.
Installation and Maintenance
The card mounts onto a dedicated slot inside the controller housing using plastic standoffs. Wiring is via removable screw terminal blocks, labeled on the PCB. A status LED indicates power-on and communication activity. Periodic firmware updates for the host controller ensure compatibility with the RITC400001’s latest EEPROM configuration.
