Principles for determining the control plan

Update:18-11-2020

There are many electrical control methods for equipment, including relay contactor control, non-contact logic control, programmable controller control, computer control, etc. In short, the reasonable determination of the control plan is an important prerequisite for the realization of a simple, reliable, and economical power drag control system. The determination of the control plan should follow the following principles:

 

1. The control method and the dragging need to adapt to the control method is not the more advanced the better, but should be based on the standard of economic benefits. For the equipment with simple control logic and basically fixed processing procedures, it is more reasonable to use the relay contactor control method; for the equipment that often changes the processing procedures or the control logic is complicated, it is more reasonable to use the programmable controller.

 

2. The control method is compatible with the degree of generalization. Generalization refers to the degree of generalization of different objects in production machinery processing. Generalization and automation are two concepts. For some special machine tools that process one or several parts, the degree of generalization is very low, but it can have a higher degree of automation. This machine tool should use a fixed control circuit; for single parts, small batches and shapes can be processed Universal machine tools for complex parts are controlled by digital programs or programmable controllers, because they can set different processing programs according to different processing objects, so they have better versatility and flexibility.

3. The control method should meet the process requirements to the maximum. According to the processing technology requirements, the control circuit should have functions such as automatic circulation, semi-automatic circulation, manual adjustment, emergency fast retreat, protective interlock, signal indication and fault diagnosis, etc. Process requirements.

 

4. The power supply of the control circuit should be reliable and simple. The control circuit can directly use the power supply of the power grid; the control device with more components and more complicated circuits can isolate the voltage of the power grid to reduce the failure rate. For production equipment with a high degree of automation, DC power supply can be used, which helps to save installation space, facilitate connection with non-contact components, component movement is stable, and operation and maintenance are also safer. There are many factors that affect the determination of the plan. The technical level and economic level of the final selected plan depend on the designer's design experience and the flexible use of the design plan.

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