Automatic Control Unit for Wood dryers MC-904

Serbian version

Russian version

Wood dryers (drying kilns) catalogue (.PDF 4MB)

ESP/ENG Catalogo secadores de madera / Wood dryers (drying kilns) catalogue (.PDF 4MB)

GER/FRA Katalog Holztrocknung / Catalogue de Séchoirs à bois (.PDF 5MB)

Measurement & control equipment catalogue (.PDF 2.8MB)

Since 1990

CONTROL OF THE DRYING PROCESS

Automatic control unit used for drying process control in dehumidifying and combined wood dryers (kilns)

MC-904

Wood dryers:
Conventional kilns
Dehumidifying dryers
Mini (Low-cost) kilns (NKS)
Heat pumps
Additional equipment
Power electric switch board

Catalogues and manuals:
Wood dryer catalogue (.pdf 3.7MB)
NIGOS dryers (.pdf 956KB)
User manuals
Measurement&controll equipment catalogue (.pdf 2.8MB)

Automatic controllers for wood drying:
MC-411R, MC-412, MC-900R, MC-502R,
MC-600, MC-2000
Automation of existent conventional kilns

Archive (obsolete products no longer produced):
(MC-100RM, MC-500R, MC-100R, MC-1000)

Wood MC meters:
Portable moisture meter RVD-904
Nondestructive moisture meter DVD-240

Other:
Control unit for steaming chambers PD-02
ISPM-15 wood pallet sterilization unit MKS-05

Used in dehumidifying and conventional dryers
Automatic control, semi-automatic control and control from a distance
ON/OFF type of control
Drying of all types of wood regardless of the starting moisture content
12 invariable and 8 variable (user) drying regimes
2 inputs for air temperature measurement
2 inputs for EMC measurement
1 control input
Wood moisture content measurement in 6 points
8 relay outputs
Data recording every 3 hours (up to one month)
Alarm
Communication

MC-904 Automatic Control Unit for Wood dryers is a device that automatically controls drying process in dehumidifying and combined kilns mounted by "NIGOS-elektronik". Device achieves optimal drying conditions in the chamber through air temperature and humidity control.

Automatic control unit can control drying process based on the data retrieved from a measurement probes in automatic, semiautomatic and remote (via PC computer) control mode. Air temperature and EMC are measured in 2 points, while wood moisture content is measured in 6 points.

In automatic control mode, user must enter type of wood, thickness, desired wood moisture content at the end of drying as well as whether he wants certain drying stages or not. Then, based on this values and measured values the device on its own chooses appropriate drying program. Automatic control unit uses its relay outputs in order to control equipment installed in the kiln such as heaters, flow fans, heat pumps, atomizers (sprinklers) etc., and achieve optimal condition in the chamber.

In semiautomatic control mode, user can set desired setpoints for air temperature and humidity based on the personal experience, and the automatic control unit only maintain those values inside the kiln at the desired point.

Since MC - 904 has a built-in communication port, it can be connected to a PC computer, which enables control of a drying process from a distance (office or suitable operating room). Also, up to 15 kilns can be connected to a single PC.

LCD display show parameters and current stage of drying process, while LED displays are constantly showing air temperature, humidity and current/average wood moisture content.

During drying process some irregular (alarm) situations can occur. They are detected and displays show adequate warning. There are 2 types of alarm situations which are:

warnings - drying process continues, but error notification is shown
alarms - drying process is interrupted because an equipment malfunction is detected

All relevant data of a drying process are recorded in MC - 900R's internal memory. Data samples are taken every 3 hours. Internal memory can hold such data for a period of up to 1 month.

After a power failure has occurred, if the drying was already started, it will automatically continue starting from the measured wood moisture content upon power supply reconnection.

Technical data of a MC - 904 automatic control unit are given in the following tables:

Main characteristics
	Power supply	220 Vac; 50/60Hz; 300mA
	Number of inputs	19
	Number of outputs	8
	Displays	4 - rows x 20 - characters LCD; tripled, 4 - digit x 7 - segment LED
	Operating conditions	T: 0 ÷ 50 °C; RH: 5 ÷ 90%
	Storage	T: - 40 ÷ 85 °C; RH: 5 ÷ 90%
	Dimensions (WxHxD)(mm)	250 x 115 x 135
	Mounting hole (WxH)(mm)	252 x 117
	Weight	1000g

Inputs
Temperature inputs	Number of inputs	2
Temperature inputs	Range	0 ÷ 100 °C; 10mV / °C
Humidity inputs	Number of inputs	2
Humidity inputs	Range	2.7 ÷ 30 % EMC (UGL)
Wood moisture content inputs	Number of inputs	6
Wood moisture content inputs	Range	5 ÷ 150 %
Control inputs for temperature	Number of inputs	1
Control inputs for temperature	Range	-20 ÷ 200 °C; 10mV / °C
Digital inputs	Number of inputs	8

Outputs
Relay	Number of inputs	8
	Characteristics	3-pin; 8A / 250 Vac, uninterupted load 3A max
	Number of outputs and application	1 output for electrical heating
		1 output for water heating
		2 outputs for flow fans control
		1 output for drying
		1 output for cooling
		1 output for humidifying
		1 alarm output

Communication
Digital	Communication standard	EIA 485
	Protocol	S-NIGOS

Wood dryers - home page

User manuals

18000 Nis • Srbija • Borislava Nikolica - Serjoze 12
Phone/fax. +381 18 211-212, 217-468 • E-mail: office@nigos.rs