Name: Carel pCO3 series
Brand: Carel
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pCO Sistema

Code: +030220336 - rel. 1.5 - 22/12/10

INTRODUCTION

pCO sistema: the CAREL range of programmable controllers.

This consists of programmable controllers, user interfaces, gateways and communication and remote management interfaces to offer the HVAC/R market a control

system that is powerful, flexible and easy to interface with the more commonly-used building management systems. pCO sistema is very reliable and can be easily

customised to differentiate the controller on the manufacturer’s own air-conditioning or refrigeration unit.

1. GENERAL FEATURES

All versions of these controllers use a 16-bit microprocessor and up to 4 Mbytes of memory to ensure high performance in terms of speed and memory space. The

pCO sistema controllers also come in different sizes according to the number of inputs and outputs so as to always offer the best cost/performance ratio. Given the

increasing demand for integration, the pCO sistema family can communicate using some of the most commonly-used communication serial standards, and with the

addition of optional boards can be integrated into the most widely available BMS systems.

The pCO

family features the possibility to connect ratiometric sensors, the integration of a Built-In terminal, an upgraded programming key and a serial port for

connection to the controlled field devices (valves, I/O expansions, electronic valve drivers…). All these features ensure our controllers a level of excellence in

responding to the needs of the HVAC/R market.

1.1 Programmability

The CAREL pCO sistema controllers can be programmed using the EasyTools development system, with the following advantages:

• transfer of the software to different types of CAREL hardware. The applications developed for the pCO can simply and quickly transferred from one hardware

platform to another (and vice-versa), simply adapting only the inputs and the outputs;

• rapid development, at competitive costs, of custom programs;

• reliability guaranteed by the use of standard routines, tested in the field.

The use of EasyTools, moreover, ensures the customer the maximum level of privacy and self-management when developing new programs on their own. The

possibility to use the same hardware for different applications allows standardisation, with the clear advantages of being able to feature in-circuit and functional testing

and burn-in procedures on all of the products and consequently reach a high level of reliability, both overall and in terms of the individual electronic components.

EasyTools: exclusive CAREL development software, easy to use, for the programming, simulation, supervision and definition of pLAN networks using CAREL terminals

and pCO programmable controllers.

1.1.1

1.1.11.1.1

1.1.1 Applications

ApplicationsApplications

Applications

The programmability of the pCO sistema controllers ensures the absolute flexibility of the applications.

The same standard hardware can be used to control:

• chillers and heat pumps;

• roof-top units;

• air-conditioners;

• small / medium air handling units (upon request);

• showcases (upon request and to specifications);

• cold rooms (upon request and to specifications);

• seasoning rooms;

• compressor packs;

• universal circuit-closing switches.

Other types of programs can be developed to specific customer requirements.

1.1.2

1.1.21.1.2

1.1.2 Hardware architecture

Hardware architectureHardware architecture

Hardware architecture

The structure of the pCO sistema controllers features:

• the pCO controller

pCO controllerpCO controller

pCO controller, fitted with a 16-bit microprocessor for running the control program, and the set of terminals required for connection to the controlled

devices (for example: valves, compressors, fans). The program and the parameters are saved permanently in the flash memory, preventing data loss in the event

of power failure (without requiring a backup battery).

The pCO can also be connected to pLAN networks made up of a maximum of 32 pCO controllers and terminals. Each board can exchange information without

the need for additional hardware (any variable, digital or analogue, according to the application software) at high transmission speeds. The connection to the

supervisor/telemaintenance serial line, based on the RS485 standard, is made using the optional serial boards (PCOS004850) and the CAREL communication

protocol.

• The terminal

terminalterminal

terminal, also managed by microprocessor, fitted with display, keypad and LEDs to allow the programming of the control parameters (set point, differential

band, alarm thresholds) and basic functions by the user (ON/OFF, display of the controlled values, optional printing).

The terminal does not have to be connected to the pCO for normal operation, but can be used for the initial programming of the fundamental parameters.