The temperature of PLC control cabinet is related to the ambient temperature of electronic devices, which is generally within the range of 5 ℃ ~ 40 ℃. On the other hand, in the natural cooling control box of non-forced cooling, the cabinet itself is miniaturized because of the space saving and miniaturization of the machine equipment and system, so the internal structure temperature of the cabinet is sometimes 10 ℃ ~ 15 ℃ higher than the outside of the cabinet. Therefore, the following preventive measures must be taken for the heating of the set site and cabinet. In order to ensure that the temperature in the cabinet does not exceed the application environment temperature of the unit, a good temperature margin should be maintained as much as possible so that the application can be within the allowable ambient temperature.

Common problems of PLC control cabinet

① It is not necessary to connect the cables to each other according to the connection between the terminals.

The terminals of multi-core cables should be properly supported and fixed to prevent the end support force.

③ When the series of movable components, one end of the PLC control cabinet wire is fixed on the fixed component, and the other end is fixed on the theme movable component, and the flexible cable is used to prevent the damage of the cable due to the power switch of the door.

The cable end should use crimp terminal. When connecting with the terminal, use a torque screwdriver to tighten the screw with appropriate pressure to achieve connection. In particular, when connecting a terminal to which an alternating current unit is introduced, it is desirable to apply a U-shaped crimping terminal instead of a ring-shaped crimping terminal in order to ensure this.

⑤ In the routing link of PLC control cabinet, when the dust cover is installed at the program controller module, the dust cover cannot be removed before the routing is carried out to prevent the routing debris from entering. In addition, the dust cover needs to be removed after wiring, because the ambient temperature of the internal structure will rise sharply during operation, resulting in a decline in function.

The PLC control cabinet switching power supply circuit wiring selection of five types of twisted pair

⑦ PLC control cabinet will also reduce the effect of noise filter, so do not tie the primary side and secondary side of the noise filter together.

The birth of the control cabinet has greatly improved our daily life and production speed, saved a lot of manpower and material resources, and the control cabinet is also defective. Often subject to environmental hazards, endangering operational efficiency. It is a component of the isolating switch set in the control cabinet, which is directly connected with the incoming line of the power supply and plays an important role in the disconnection of the power supply circuit of the control cabinet. Moreover, when the power circuit in the frequency converter and the control box produces a short circuit or load, the isolating switch can also play a protective role. The fundamental reason is that the isolating switch protects the person of the operator when the operator repairs the equipment. Let's take a look at the control cabinet in the factory production in the use of matters needing attention:

Under 1. continuous high temperature conditions:

1. Blow refrigeration. Forced ventilation. Forced circulation. Refrigeration of the entire room.

2. under ultra-low temperature environment:

plc control cabinet manufacturers propose that if the ambient temperature is less than zero, you can also assemble a small-capacity indoor space electric heater in the cabinet to heat the indoor space in the cabinet to the operating temperature, and then maintain the heating according to the requirements of the power supply.

3. vibrations and factors:

1. Residential structure and cabinet contact area should be shock absorption solution.

2. Separate the program controller control box from the host power supply.

The role of the air environment:

1. In the dust-free soil, acid and alkali vermicelli or organic solution floating area, the application of internal structure temperature control effect is better large and medium-sized sealing cabinet.

2. In the area without corrosive gas, the control cabinet must cause gas to increase the pressure of the internal structure, and the corrosive gas should be placed outside and enter.

3. When there is flammable gas control cabinet to minimize in this place, assemble explosion-proof electrical equipment.