The British witten IVC1 - 1614 mat1 series PLC and touch screen in the control system of the circulation fan applications - Industrial control -

One, the main application profile circulation fan control system to detect the temperature at which the fan operation, vibration, main motor machine core temperature measuring point, through these points start-stop, regulation, protection of fan. Through a given throttle opening size control flow rate of fan, through a given frequency control its speed. System is mainly composed of PLC, the British witten British witten HMI hardware composition and so on. PLC is installed on the top cabinet, it is the core part of the system, an intelligent logic, when necessary to provide accurate protection signal. Touch screen image shows the system's running status and value of measuring points and highly interactive function.

this system has high flexibility and reliability, easy to maintain, modular structure graphical display intuitive, simple and convenient operation, is an important guarantee for the safe operation of the fan.

2, application design and implementation of the project adopts the British witten DI 16 points, 14 points DO, 2 AI ( Demand at 7 AI) 1 point, AO ( AO needs 2 point) PT100 signal (4 o 'clock, Demand PT100 signal at 7) PLC controller and HMI man-machine screen, according to project requirements, as PLC wiring diagram, FIG. 1) 。 Figure (

1)

main logic PLC program overview: 1, collect fan, motor bearing temperature, fan bearing vibration, the throttle opening, feedback, frequency feedback speed 2, the local/remote control of the electric heater 3, the local/remote control of the circulation fan ( Start condition is not met, prohibit to start the fan) 4, the throttle opening local/remote control ( According to the required flow freely within the range 0 ~ 100%) given 5, speed (local/remote control According to the required speed within 0 ~ 50 hz freedom given) 6, when the temperature reaches set the alarm or stop value, the system alarm or shutdown. Figure (

2)

subroutine calls ( PT100 signal operation, 4 - 20 ma signal operation)

control object, Electric heater) , divided into local control and remote control

circulation fan start conditions ( Condition is met before start fan)

control object fan ( Rev. , 2 s stop signal output pulse)

4 - 20 ma yun operator program

PT100 signal arithmetic ( Part list)

HMI screen description

this picture surveillance system of each measuring point parameters, alarm, stop the value and range value, heater, fan control start/stop, speed for a given frequency, the throttle opening.

note: in case did not meet the conditions of the heater or the fan start/stop button will be displayed as 'gray', operation is prohibited.

system outage alarm, information will be shown here

3, the actual application icon ( Left) For the detection of the actual value of measuring points and graphic ( Upper right) For the status display area, graphic ( The lower right) For the control area ( Four buttons for 'gray', according to its not start/stop conditions) 。

element arrangement is illustrated below

the circulation fan control system control cabinet

4, application experience, the experience of the British witten PLC and the British witten HMI, although only a short time contact, but I have to understand and familiar with the basic application of it.

in addition to bringing the British witten PLC programming outlets, with a group of MODBUS communication port, it can communicate with a lot of PC to realize data exchange, the British witten PLC controller variety, comprehensive functions, users can choose appropriate CPU according to the project requirement.

the British witten HMI design closer to the actual application, you can talk with many PLC for data transmission, its various functions in the only reflect part of there will be more users slowly discover. The experience of the products in the circulation fan control system is in normal work.

generally speaking the British witten products cost-effective, content value, technical support is in place, with strong market competitiveness.

technology section of the British witten IVC2H type PLC application in the woodworking machinery equipment the British witten IVC1 - 1614 mat1 series PLC and touch screen in the circulation fan control system, the application of the letter the PLC control of the central air conditioning design the PLC controller and kingview, the letter in the new type wall material industry to realize the whole workshop equipment far program-controlled Mr More PLC in plastic processing plants to improve the application of injection molding machine manipulator
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