Return to site

Analysis of grounding condition of asphalt mixing plant

broken image

In actual work, people find that in many cases, we encounter such a problem, when using the asphalt mixing plant, its control system often suffers some interference.

Therefore, in order to avoid the effects of these interferences, we have also taken many methods, such as grounding, isolation, and the use of twisted pairs.

Today, the main method is the first one.

In order to ensure the smooth progress of the work, the asphalt mixing plant usually sets up the necessary automatic control system. These systems mainly include industrial computer, PLC power supply line, and various types of signals, including: PLC Input and output switch signal; weighing instrument; micro-electric signal of industrial computer and instrument and other controller communication.

Therefore, in this case, various groundings are required.

For the sake of understanding, we will introduce the main content of grounding in detail.

First of all, the first common one is protective grounding, which is one of the important means to protect workers and equipment safety.

The protective earthing is to form a good conductive connection between the normally uncharged metal part of the control system of the asphalt mixing plant and the ground, or when the insulation breakdown and equipment damage, the protective grounding acts as a return path for current flow, thereby protecting The role.

In addition, the protective ground has a certain anti-static effect.

The second way is to ground the power system. This grounding method still has many advantages.

When the basic installation is carried out, the manufacturer will prepare a foundation map first, and then arrange a large ground net according to the requirements of this figure. Most of the time, the grounding of the control system of the entire asphalt mixing plant is with this place. The wires are connected together and are not directly grounded by the power system.

The last method is called lightning protection grounding. If it is subdivided, it can be divided into two ways. The specific contents are as follows: 1. Ground the metal cable tube or slot surface used for laying signal lines to prevent coupling interference; If the control system of the asphalt mixing plant is an overhead signal line, lightning protection measures should be taken at the input terminals of the computer to suppress interference.