Carel PCO5+ 500BAA000L0 Programmable Controller

The Carel PCO5+ 500BAA000L0 is a programmable electronic controller designed for HVAC/R (Heating, Ventilation, Air Conditioning, and Refrigeration) applications. This large version controller features a powerful configuration of inputs and outputs: 10 digital inputs, 10 analog inputs, and 18 outputs. The PCO5+ series builds upon the success of the PCO5 and is pin-to-pin compatible with earlier PCO3 and PCO5 controllers, protecting customer investments in software and wiring. The controller is suitable for applications including chiller management, air handling units, refrigeration racks, and heat pumps.

Technical Specifications

Digital inputs: 10 channels (voltage-free contacts). Analog inputs: 10 channels, configurable for a wide range of probes including NTC, PTC, PT100, PT500, PT1000, 0 to 1 V, 0 to 5 V, 0 to 10 V, 0 to 20 mA, and 4 to 20 mA. Analog input channels can also be configured as digital inputs (voltage-free) or analog outputs (PWM or 0 to 10 V). Outputs: 18 total, including relay outputs and analog outputs. Communication ports: built-in MODBUS Master, MODBUS Slave, and pLAN port. Optional communication: two additional serial lines configurable for MODBUS, BACnet, CAREL, CANbus, Konnex, or LonWorks, with physical support for RS485, Ethernet, CAN, Konnex, FTT-10. Versions are available with both Host and Device USB ports for connecting a USB drive or direct PC connection without serial converters. Power supply: 24 V AC or 115-230 V AC depending on model. Programming software: Carel pCO programmer (c.pCO) using IEC 61131-3 language.

Key Features

• 10 digital inputs, 10 analog inputs (configurable as digital or analog output)

• 18 outputs (relay and analog)

• Built-in MODBUS Master and Slave protocols

• Built-in pLAN port for connection to Carel pGD series terminals

• Up to 5 serial lines total (3 always available, 2 optional)

• Optional protocols: BACnet, CANbus, Konnex, LonWorks

• Optional physical interfaces: RS485, Ethernet, CAN, Konnex, FTT-10

• Host and Device USB ports for programming and data logging

• Integration of EVDEVO driver for electronic expansion valves with ultracap technology

• Pin-to-pin compatible with pCO3 and pCO5 controllers

• Flexible mounting: DIN rail (6 DIN modules) or panel mounting

HVAC/R Application Focus

The PCO5+ controller offers specific new functions for improving efficiency in HVAC/R systems. Analog input channels can be configured as digital inputs (voltage-free), analog outputs (PWM or 0 to 10 V), or probe inputs. The controller supports integration of the EVDEVO driver for control of electronic expansion valves with ultracap technology, guaranteeing stepper electronic expansion valve closure in the event of power failures (ultracap backup). The controller is programmable using Carel's c.pCO software, which supports ladder logic and function block diagram programming. The software includes pre-programmed libraries for HVAC applications, reducing development time.

Communication and Connectivity

The PCO5+ 500BAA000L0 provides extensive connectivity for building automation and industrial control. The built-in MODBUS Master port allows the controller to read data from MODBUS RTU slave devices (e.g., power meters, drives). The MODBUS Slave port allows a building management system (BMS) or SCADA to read controller data and modify setpoints. The built-in pLAN port connects to Carel pGD series display terminals for local operator interface. Optional communication cards expand connectivity to Ethernet (Modbus TCP, BACnet/IP), CANbus (for drive networks), or LonWorks for integration with specialized BMS systems. Up to 5 serial communication lines are available (3 always available and configurable, plus 2 optional lines) allowing the controller to serve as a gateway between different protocols.

I/O Configuration

The 10 analog inputs are highly configurable, supporting virtually all common HVAC sensors. All analog input channels can be configured as digital inputs (voltage-free) if analog sensing is not required. Outputs include both relay outputs for on/off control (compressors, fans, pumps) and analog outputs for modulating control (electronic expansion valves, variable frequency drives). The controller also provides PWM outputs for controlling actuators that require pulse width modulation. Versions with built-in drivers can control one or two electronic expansion valves directly. The controller is available in multiple sizes (small, medium, large, extra-large) with different I/O counts; the 500BAA000L0 is the large version with the full I/O complement.

Applications

The PCO5+ 500BAA000L0 is used in numerous HVAC/R applications including: chiller control (water temperature regulation, compressor staging), air handling units (temperature, humidity, pressure control), refrigeration racks (superheat control, defrost management), heat pump control (reversing valve, compressor speed), condensing unit management, and building management systems. The controller's compatibility with earlier PCO3 and PCO5 controllers makes it suitable for retrofitting existing installations with enhanced functionality.

Installation and Configuration

The controller mounts on a 35 mm DIN rail, occupying 6 DIN modules (106 mm width). Power the controller with the specified supply voltage (24 V AC for this variant). Connect sensors, actuators, and communication wiring using the removable terminal blocks. Programming is performed using Carel's c.pCO software (IEC 61131-3). The software runs on Windows and communicates with the controller via USB or serial connection. Programs can be downloaded, debugged, and monitored online. The controller supports upload of programs for backup and maintenance purposes. For HMI, connect a pGD series terminal (e.g., pGD0, pGD1) to the pLAN port. The controller can also be configured remotely via Ethernet or Modbus.

Environmental and Compliance

The PCO5+ is CE and RoHS compliant. Operating temperature: 0°C to 55°C (depending on model). Storage temperature: -20°C to 70°C. The controller is designed for installation in indoor control cabinets. It meets EMC immunity and emission standards for industrial and residential environments.

Conclusion

The Carel PCO5+ 500BAA000L0 programmable controller provides a versatile, high-capacity control solution for HVAC/R systems. Its extensive I/O configuration, multiple communication options, and compatibility with the broader Carel ecosystem make it a suitable choice for OEMs and system integrators in the building automation sector.