The Carel PC01002CS0 is a pCO1 series programmable microprocessor controller, specifically a Medium size variant in the pCO1 family. This is an older-generation (early 2000s era) controller designed for cost-effective, reliable control in HVAC/R applications, including small-to-medium refrigeration packs, air conditioners, fan coils, small chillers/heat pumps, and basic compressor management. Key Specifications • Platform: pCO1 (16-bit microprocessor, flash memory up to 2 MB). • Size: Medium configuration (higher I/O count than Small pCO1 models). • Power Supply: Typically 24 V AC/DC or 230 V AC variants exist in the family; check the exact label on your unit (the photo shows standard pCO1 power terminals). Max consumption is low, suitable for DIN-rail mounting. • I/O Configuration (Medium pCO1 typical): • Analogue Inputs (AI): Up to 8, configurable via dip-switches (not software like later pCO5+). Supports common standards: NTC/PTC probes, 0-1 Vdc, 0-5 Vdc ratiometric, 0-20 mA / 4-20 mA, ON/OFF. Includes provisions for PT1000 in some setups. • Digital Inputs (DI): Up to 14 (24 Vac/Vdc or free contact). • Analogue Outputs (AO): Up to 4 (mainly 0-10 Vdc; some PWM options). • Digital Outputs (DO): Up to 13 (relays: SPST/SPDT; some models include SSR for frequent switching like fans or valves). • Analogue Selection and Serial Card sections visible in your photo for probe/output configuration and communication. • Real-Time Clock (RTC): Built-in or via optional Clock Card (clearly labeled in the top section of your image). • Display & Interface: Supports built-in or external terminals (pGD-style or 4x20 character LCD with buttons). The photo shows the main board without a front-panel display attached. • Connectivity: • pLAN port for local terminals (J10/J11 area). • Optional Serial Card for BMS/FieldBus (Modbus, Carel protocol, or expansions like LonWorks/BACnet via add-ons). • Programming via Carel EasyTools software or hardware programming key. • Other Features: Dip-switch configuration for analogue inputs (visible “Analog Selection” label), multi-language support in applications, alarm management, and compatibility with Carel probes/sensors. Plastic enclosure for mechanical protection and ESD resistance. DIN rail mounting. • Dimensions: Compact for Medium size (around 315 mm width in the pCO family table for similar units). • Top: Clock Card with J9/J10/J11 terminals and power indicators. • Middle: Main pCO1 board with “pCO1” embossing and Carel logo. • Bottom: Analogue Selection area (dip-switches for input types), Serial Card section, and lower I/O terminals (J1 power/GND, J2 analogue, etc.). This modular card design (Clock + Serial) was common in pCO1 for flexibility without over-specifying the base board. Primary Uses • Refrigeration & Compressor Control: Small compressor packs, cold rooms, or display cases (staging, defrost, pressure/temperature regulation). • Basic HVAC: Fan coils, small AHUs, or rooftop units with simple modulation and alarm handling. • OEM Equipment: Cost-sensitive applications where full pCO2/pCO3 features weren’t needed but programmable logic and serial connectivity were required. • Often loaded with standard Carel application software (e.g., for modular chillers, air-conditioners, or compressor packs).
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