Table of Contents

Control Software for Wood Dry kiln

Drying program:
In a general way, the MEC dry kiln control system allows the climate control in PID mode or standard mode according to the progression of the wood moisture. The PID mode allows a better regulation and precision. The drying schedule can be adapted according to various specie types and ranges of wood moisture. Moreover, it controls the drying cycle in standard mode (by scale), in VIP or time what offers much flexibility and alternative to the user. The drying schedule allows to choose the control variables wanted: fan, vent, humidification and heating according to the stages of drying. The moisture wood probes can be controlled according to the average of the probes or by the number of higher probes.

Operating system (Windows XP or 2000) & internet :
The operating system used is Windows XP or 2000, it can be connected on any type of company network allowing a best follow up as well as a better breakdown service by MEC dry kiln. Updates will be available from the FTP server of MEC dry kiln. The basic image of the principal screen is your kiln, so it is very easy to determine the site of the probes in your kiln.

PLC, inputs and outputs cards :
The MEC dry kiln control system is controlled by an (CPU) PLC of Allen-Bradley or Omron mark. This PLC is very robust because it is designed for industrial sector. If an electric breaking occurs, the components are easily replaceable. The PLC is installed and connected in an industrial control panel. The inputs and outputs cards used are industrially recognized. (They are not slotted cards together whose availability is difficult).

Temperature sensor :
The reading of the dry and wet wood temperature and outside temperature is took with RTD Pt-100 3 drivers Class A type sensors. This kind of probe allows precision at 0.0035% what allows a better precision for dry kiln application. This kind of probes is standard in CANADA with easy availability. The cable used between the probes and the junction box will be covered up with silicone and resistant to a temperature of 200ºC (392ºF). Two (2) dry temperature sensors and one (1) wet temperature sensor will be installed by drying zone and/or by kiln according to the case. On request, it will be possible to have two (2) wet temperature sensors by zone of kiln and/or by kiln according the case.

Wood moisture sensor :
The reading of the wood moisture is carried out with a wood moisture analog transmitter manufactured by Delmhorst but adapted with a multiplexer to allow the reading of several wood moisture sensors. Since this one is gauged at 70ºF with douglas fir, it will be possible to bring factors of correction in the drying schedule according to species to dry. It is important to mention that the wood moisture showed will be corrected according to the temperature of the wood. The cable used between the probes and junction boxes will be covered with silicone and resistant to a temperature of 200ºC (392ºF). Eight (8) probes of wood moisture will be installed by kiln. On request, it will be possible to install sixteen (16) probes of wood moisture by kiln.

Current failure and safety :
If a current failure occurs, the system will start by sequence the kiln already running. The positioning sequence of each kiln will be the one before the breakdown so no manual handling at the time of current failure. Forty-eight (48) messages of alarm are available to ensure the kiln correct operation as well as ensuring the people safety. Alarms are classified under two categories, critical alarms and no-critical alarms. No-critical alarms will occur when an abnormality arrived and will show a message on the screen. Critical alarms will stop the kiln (fans system and humidification will be stopped, the evacuating and the heating will be closed), they will also show a message on the screen. A pager, mail & text message management system for events and alarms is incorporated in the system to ensure you a better follow up. This system allows you to call by priorities a list of pager number defined by the user by definite interval times.

Additional Information
For additional information or to obtain a version of our demo, please contact Tony Nadeau

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