Core specifications and technical points for the design of PLC cabinet components

Standard PLC cabinet is the core control carrier of industrial automation systems, integrating various electrical functional modules to achieve automated control and operation protection of production processes. Its protection level directly determines the cabinet's adaptation scenario and the service life of internal components.

The international standard IEC 60529 is commonly used in the Application cabinet industry to calibrate the protection capability of cabinets through IP protection codes. The IP code consists of "IP" and two digits, with the first digit representing the level of protection against solid foreign objects, blocking the intrusion of dust, tools, and other foreign objects, while preventing personnel from coming into contact with live parts; The second digit represents the liquid protection level, which can resist liquid damage such as water droplets, splashing water, high-pressure water spray, etc. The larger the numerical value, the stronger the corresponding protection ability, the better the overall protection performance, and the more stringent the working environment it is suitable for.

PLC cabinet components are mainly divided into two categories based on their structural forms: welding cabinets and profile bending modular cabinets. Each type of cabinet has significant differences in structure, performance, and applicable scenarios. The welding cabinet is formed using an integral welding process, with the frame and outer cladding welded together as a non removable whole. The door panels are sealed with glue, which has the advantages of low initial manufacturing costs and structural rigidity guaranteed by the welding process.

The disadvantages are that the cabinet is prone to deformation, limited sealing performance, protection level of IP54 or below, and cannot be reconstructed or expanded. The convenience of maintenance and upgrading in the later stage is poor, making it suitable for non critical working conditions with ordinary environmental requirements, limited budget, and fixed control circuits.

The profile bending Modular PLC cabinet is made of high-quality cold-rolled steel plates that have been bent multiple times to form a frame. It is assembled through bolt splicing without welding, and has a high degree of modularity. It can be installed in multiple cabinets and has good grounding continuity. The protection level can reach IP55 or above, and the load-bearing capacity is positively correlated with the structural complexity. It is currently the mainstream selection for industrial automation integration and is suitable for most conventional and medium to harsh industrial environments.

Automation control cabinets with different IP protection levels correspond to different working environments, and the selection should be accurately matched with the on-site dust, humidity, and water flow contact conditions. IP20 grade cabinets do not have waterproof capabilities and can only block large-sized solid foreign objects and prevent personnel from electric shock.

They are suitable for dry, dust-free, temperature and humidity controlled indoor environments such as distribution rooms, central control rooms, and clean laboratories; IP54/IP55 is a general industrial mainstream protection level that can cope with conventional dust, water vapor, and multi angle splashes. It is suitable for ordinary industrial workshops, processing and assembly production lines, automation equipment interiors, and shielded outdoor non direct shower environments. It is the most commonly used level for factory interiors;

IP65 rated Electric cabinets PLC panel cabinets achieve complete dust prevention and can withstand low-pressure water spray. They are suitable for workshops such as food, pharmaceutical, chemical, etc. that require regular flushing, as well as high dust processing scenarios and outdoor installation scenarios with shielding; IP66/IP67 has a higher protection level and can withstand strong water spray and brief immersion. It is suitable for harsh outdoor environments such as unshielded outdoor, port terminals, wind and photovoltaic projects, and is suitable for long-term exposure to wind and rain.

The design of Industrial panel cabinet is centered on meeting basic protection and ensuring operational safety. The minimum protection level for conventional industrial scenarios needs to reach IP54, and the design phase needs to focus on controlling the three core details of sealing, opening, and wiring.

Foam sealing strips should be installed at the sheet metal joints and door panel positions of the Dustproof PLC cabinet. The compression amount of the sealing strips should be controlled at 25% -30% to ensure the sealing effect. Random openings are prohibited at the top of the cabinet to prevent water and dust from seeping into the cabinet; Special waterproof cable joints must be used for cable import and export, and unused holes must be sealed with blind plugs. The interface between the cable tray and the cabinet must be sealed synchronously. The cable tray adopts a fully enclosed design, and the cable tray cover is equipped with sealing strips to prevent foreign objects and liquids from entering in all directions.

In addition, export Stainless steel PLC cabinets need to comply with international certification requirements. Exposed components such as touch screens, operation buttons, and industrial control computers inside the cabinet need to rely on high protection cabinets to achieve protection standards, meet the dual standards of mechanical and electrical safety, and ensure the dual safety of equipment operation and personnel operation.

If you have any related needs for PLC cabinet components customization, protection level selection, design optimization, or engineering matching, please feel free to contact us at any time for communication. We can provide compliant, professional, and highly adaptable solutions based on your actual working conditions and usage requirements, to assist in the efficient implementation of projects.