The current electric food tunnel furnace in the food processing industry is widely used to replace the power of gas to gas as energy for the power of the region has a great significance, can ease the power shortage in the region.

1 equipment parameters and equipment configuration
The gas-type food tunnel furnace length of 13 meters, is divided into three areas into the mouth area, the middle area, outlet area. Each zone is divided into fire area and fire area, the fire area and the fire area are equipped with a three-wire PT100 temperature sensor to detect the temperature of the area, a total of six temperature sensor sensors, which will be six areas of fire Temperature control in a certain range.
The food tunnel furnace requires that the baking time be set according to the different types of baked food.
According to the characteristics of the equipment and customer requirements, the device electrical configuration: a model for the DOP-A10TCTD man-machine interface; a DVP-60ES programmable controller; two DVP-04PT / S temperature measurement module; A VFD037M43A frequency converter, through the PLC programmable controller and man-machine interface program to complete the system to complete the system integration, equipment to achieve electrical control.

2 solution
Use the inverter to change the speed of the tunnel furnace chain motor to achieve the control of food from the mouth to the mouth of the time is the food baking time.
The parameter setting screen is shown in Fig. Different types of tunnel furnaces are first given by the length given, the speed ratio given, the sprocket syllabus given, which is a general parameter leaf, suitable for all types of tunnel furnaces. The parameter leaf can also monitor the set frequency and operating frequency of the frequency converter and set the exhaust time.
Baking time and delivery control screen shown in Figure 3. In the man-machine interface on the production of alternating button through the PLC program to complete the control of the inverter is running forward and reverse run start, positive and negative operation to start the above covered lantern, when the forward run is running when the text is running in the form of revolving To show, reverse is no different.
The frequency of the inverter is the man-machine interface through the RS485 and inverter communication to complete the frequency setting, through the numerical input component gives the baking time can be prepared by the previously prepared CLOCK macro should be set in the actual operation of the frequency Value, this value assigned to the inverter 2001H frequency set address to complete the operating frequency of the write.
Temperature setting and display screen shown in Figure 4. DVP-60ES and DOP-A10TCTD through RS232 communication, DVP-60ES and DVP-04PT through the RS485 communication through the temperature module 04PT read back to the temperature of the PT100 in order to come Complete the temperature feedback, through the PLC program to control the gas valve opening and closing, to achieve temperature closed-loop regulation, to achieve the baking interval process temperature control.