 |
 |
 |
 |
 |
         |
||||
|
||||
|
               
Serbian version
Russian version
|
 |
|
 |
 |
|||||||||||||||||||||||||||||||||||||||||||||||||||||||
|
CONTROL OF THE DRYING PROCESS |
|
||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
|
Automatic control unit used for drying process control in small capacity dehumidifying and conventional wood dryers (kilns)
Automatic control unit MC-411R is a device that automatically controls drying process in small capacity dehumidifying and conventional kilns mounted by "NIGOS - elektronik". Device achieves optimal drying conditions in the chamber through air temperature and humidity control. Automatic and semiautomatic control mode are supported. Drying of the wood always pass through several stages. When powered-up automatic control unit starts with measurement stage immediately, regardless of the chosen control mode. In semiautomatic control mode this stage last about 20 seconds in order to moderate the measurement. In automatic control mode this stage lasts until average wood moisture content is calculated. Heating stage follows after, in case the temperature in the drying chamber is lower than the drying temperature needed. During this stage, temperature in the drying chamber is increased following heating gradient until minimal required drying temperature is reached, when drying stage starts. Automatic control unit starts to control temperature/humidity/moisture in this stage. In automatic control mode MC-411R follows chosen drying regime and drying diagrams included in it. In semiautomatic control mode, these drying diagrams have no influence on drying, because user sets values for air temperature and humidity manually, and automatic control unit only act to maintain these values inside the drying chamber. Transition from automatic to semiautomatic control mode and reverse is possible at any time. When such transition is made, drying process starts from a beginning. If automatic-to-semiautomatic control mode transition is made in the middle of drying, values for temperature and humidity that are measured in that moment become setpoint values for semiautomatic control mode until user change them manually. In reverse situation (semiautomatic-to-automatic control mode transition), automatic control unit measures average wood moisture content in that moment, and uses this value to calculate setpoint values for air temperature/humidity according to a chosen regime. After a power failure has occurred, drying process is interrupted and upon power supply reconnection MC-411R continues with drying starting from the drying point determined after measurement stage is finished. Technical data of a MC - 411R automatic control unit are given in the following tables:
|
|||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
- heating (2-pin; 8A / 250 Vac)
- dehumidifying drying (2-pin; 8A / 250 Vac)
- cooling/conventional drying (3-pin;8A / 250 Vac)
- humidifying (2-pin; 8A / 250 Vac)
|
|
|
 ©2011 NIGOS-elektronik |
 |
18000 Nis • Srbija • Borislava Nikolica - Serjoze 12 Phone/fax. +381 18 / 211-212, 217-468 • E-mail: office@nigos.rs |
 |
