PLC Control Electrical Cabinets – Structure, Functions and Applications

BTB Electric

• News
• Sep 25, 2024
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PLC control cabinets play an important role in modern automation systems, being the center for controlling and monitoring the operation of the whole electrical system. In the following article, you will learn with BTB Electric the structure of PLC electrical cabinets, functions and practical applications of this type of industrial electrical cabinet.

Definition of PLC Control Electrical Cabinet

PLC control electrical cabinet is an intelligent control electrical cabinet programmed by software and PLC controller to automatically control industrial machinery systems according to production requirements. Through PLC programming, humans can operate and operate remotely through the touch screen. Cabinets are installed in the control area of factories, warehouses, enterprises, large buildings,..

The introduction of PLC control electrical cabinets helps to free human labor, increase accuracy and increase production automation to he lp increase machine productivity. At the same time, the working time is also shortened thanks to modern technology on this control cabinet.

PLC Cabinet Specifications

The specifications of the PLC cabinet include:

• Size: Depending on the device to be controlled, the size of the PLC cabinet will be different
• Shell Material: Galvanized Steel, Waterproof Steel
• Voltage: 220VAC/ 24VDC
• PLC Controller
• Expansion modules: DO, DI, AO, AI…
• PLC Control Power: 24VDC
• Operation mode: Auto/ Manual
• Display: HMI Touch
• Connecting the remote control to the system

Functions of PLC Electrical Cabinet

With intelligent automatic control, the PLC control electric annealing machine has the following functions:

• Cut-off Control (On/Off) : Used in opening and closing pumps, motors, motors,..
• Counter Control: Use quantity counting.
• Timer Control: Use open and close over time, running sequentially on the island.
• Frequency Conversion Control (PID): Using advanced forms, frequency conversion to serve in domestic water treatment, wastewater treatment, motor and motor control,…

In addition to the on-site automatic control functions, the PLC electrical cabinet is connected to a remote monitoring and control system – SCADA that works with the pump or motor. This function is useful for hazardous chemical industries or working hazardous areas such as pits.

Structure of PLC control electrical cabinet

PLC electrical cabinets have the main structure including PLC programmers including components: RAM program memory, ROM; the CPU central processor is responsible for processing algorithms; signal input/output modules.

Along with that, the inside of the PLC electrical cabinet includes:

• HMI: The department displays all programs in the system and is in operation.
• PLC: Programmable Logic Controller
• CB cut-off: Depending on the electrical system, choose MCCB or MCB.
• Contactor: Circuit breaker and switcher.
• Thermal relay: Thermal induction electrical switchgear
• Intermediate relay: Electrical switchgear with low current.
• Transformer: The power supply unit for the PLC control circuit.
• Timer: The unit that controls the operating time of the PLC cabinet.
• Components: indicator lights, swing buttons, push buttons, bridges, wire trays, wires,…

The PLC controller has the function of receiving and producing analog signals. From there, the cabinet will work smartly, you can use a timer, PID, counting controls,.. The operator takes the signal through the intermediate relays, contactor contacts, and thermal relays. Then control the pumps and motors according to the requirements set by the electrical system.

The modern PLC cabinet has overcome most of the errors and upgraded the programming of the PLC set to meet the requirements well:

• Use a programming language that is easy to learn and handle.
• Compact PLC structure, convenient for repair and maintenance.
• Large memory capacity, can accommodate complex programs.
• High security, suitable for large systems.
• Communicate with PC, internet, and extended module.

Working Principle of PLC Electrical Cabinet

The PLC controller in the cabinet will operate in cycles including:

• Reading Input Signals
• Implementation of the program
• Internal Communication
• Hole self-test
• Send output signal updates

Through an input module, signals from peripheral devices (such as sensors, contacts, ,..) are fed into the CPU. After receiving the input signal, according to the pre-programmed program system, the CPU will process and proceed to send the control signals through the output module to output to external devices according to the pre-programmed program.

Benefits of Operating a PLC Electrical Cabinet

Compared with other types of control cabinets, PLC electrical cabinets have outstanding advantages such as:

• The circuit is compact and lightweight, easy to maintain and repair.
• Capable of performing complex algorithms with high accuracy.
• The programmed program can be changed as desired.
• The modular PLC structure allows users to replace, expand inputs/outputs and expand other functions.
• Good anti-interference ability, can work in harsh industrial environmental conditions.
• Ability to communicate and connect with other smart devices such as computers,..

Practical application of PLC electrical cabinet

PLC cabinets are considered the most perfect solution for controlling and controlling the intelligent electrical production and operation process. The PLC system connects the sensor signals and manually to simultaneously control, monitor and store. As a result, this industrial electrical cabinet can connect computer systems and remote monitoring control software, allowing for centralized and scientific operation.

Normally, PLC electrical cabinets will be installed in the control area of industrial buildings and industrial plants. Automatic production systems on the line need to use this type of industrial electrical cabinet to increase machine productivity, limit human labor, thereby improving production efficiency.

Many industries and many types of machines are now applying PLC control cabinets such as food processing machines, high-speed cutting machines, monitoring allocation systems in production lines, printing machines, threading machines, packaging machines,…

Use of BTB Electric Electrical Equipment for PLC Electrical Cabinet

BTB Electric is a manufacturer of industrial electrical equipment that meets European standards, providing many important electrical equipment in PLC control electrical cabinets such as CBs, contactors, thermal relays,… The equipment is manufactured according to EN, IEC quality standards,… have been applied in many industrial electrical cabinets in factories and workshops in Vietnam.