Air Conditioning Controls
CAREL Controls - Air Conditioning controllers
CAREL pCO Sistema
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 CAREL 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 CAREL 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.
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CAREL pCO3 Programmability
The CAREL pCO air conditioning 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.
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.
Hardware architecture
The structure of the pCO sistema controllers features:
- the 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, also managed by a 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.
The power of the application software means that the user terminal allows:
- the initial programming of the unit, with password-protected access;
- the possibility to modify, at any time, the fundamental operating parameters, optionally protected by password;
- the display and audible signalling (by buzzer) of any alarms;
- the display of the active functions, using the LEDs;
- the display of all the values measured.