Constant temperature and humid PLC control system
Description:
Constant temperature and humid PLC control cabinet widely used in workship, exhibition, archive room, laboratory, network room need constant temperature and humid.
Xiangke constant temperature & humid system saved much energy, reduced compressor working time and extended service life compared with traditional air conditional. it has good stable, Strong anti-interference ability.The system fixed warm humidity transmitter as digital transmission.long transmission distance, free of electrostatic interference. Control precision.
System hardware structure:
The core of system is Siemens PLC, touch screen as human-computer interface. the temperature and humility transfer by sensor, It is processed into digital signal by single chip, via RS485 wire transfer to PLC, and data processing, and controlled via PID. Keep constant temperature and humility controlling compressor, humidificatin valve,fan valve.
The procedure of control for constant temperature and humid:
There are 5 method from PLC controlling.
- monitor status. The system only reads the temperature and humidity of the environment,without controlling.
- Hand control status.when compressor forced operation need hand control.You can touch compressor 1, compressor 2 for start.
- Automatic humidification, When start this method, the system will work according fixed upperlimit & lowerlimit.
- Automatic temperature control. When start this method, the system will work according fixed upperlimit & lowerlimit.At the same time, monitor the outdoor temperature is less than 14 ℃
- Circulation working: combination method 3 & method 4. Temperature controlling then humidification controlling.
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