Solution

Atekon Technology Co., Ltd.

Metro MCC System Solution

Release date:

2025-02-10

I. Introduction to the Application Background

The Motor Control Center (MCC), short for Motor Control Center, is a control system specifically designed for motor equipment. It is divided into two types: traditional MCC and intelligent MCC. Traditional MCC uses hard-wired remote I/O interfaces to enable remote monitoring of motor control circuits, while intelligent MCC communicates with smart components controlling the motors via a fieldbus, thereby achieving advanced motor equipment monitoring capabilities. In subway station applications, the intelligent MCC system centers around ventilation and air-conditioning control. Each end of the station—specifically in the ventilation and air-conditioning control rooms—houses a PLC control cabinet, enabling centralized management of equipment such as station fans, air dampers, tunnel fans, and track exhaust fans. These control cabinets are strategically placed at both ends of the station. For jet fans located farther away from the control rooms, local electrical control boxes are installed on-site. These boxes are connected to the nearest ventilation and air-conditioning control room's PLC control cabinet via fiber-optic communication links. Each ventilation and air-conditioning control room is equipped with a PLC control cabinet, along with frequency converter cabinets, soft starter cabinets, and additional distribution panels for various fans and air dampers. The PLC control cabinets communicate seamlessly with the station’s BAS system through dedicated communication interfaces, receiving commands to manage ventilation and air-conditioning operation modes. Based on these mode instructions, the PLC precisely controls the corresponding fans, air dampers, and other equipment. Additionally, each PLC control cabinet features a 15-inch color touchscreen display, providing real-time visibility into the operational status of equipment at both ends of the station, as well as diagnostic information from devices linked to the fieldbus network. This interface also allows on-site operators to perform local control operations directly from the touchscreens.

 

Advantages:

1. Enhance comfort: Adjust parameters such as air temperature, humidity, airflow velocity, and cleanliness to provide a cozy and pleasant driving environment.

2. Ensure Safety: Real-time monitoring of environmental parameters inside stations and tunnels to prevent safety hazards such as fires and smoke, thereby safeguarding the lives and property of passengers.

3. Energy Conservation and Environmental Protection: Utilizing high-efficiency, energy-saving air conditioning equipment and advanced air purification technologies to effectively reduce energy consumption and emissions.

4. Intelligent Management: By analyzing data, we can predict trends in environmental changes and proactively make adjustments to enhance operational efficiency.

 

II. Introduction to the Control System Solution

Each end of the station is equipped with a set of PLC control systems in the ventilation and air-conditioning electrical control rooms. Each room includes one PLC control cabinet, along with several motor control cabinets housing equipment such as fans, electric dampers, and other components. The PLC control cabinet for the ventilation and air-conditioning equipment features a built-in PLC, a touch screen, and a UPS power supply (available only at section substations). Meanwhile, the motor control cabinets are fitted with distributed I/O modules, variable-frequency drives, soft starters, intelligent motor protectors, as well as contactors, relays, and other devices essential for motor start/stop control and protection.

The PLC control cabinet is equipped with the ATO NA400 series CPU401-0431 controller, which features a program memory space of 32MB and uses permanent-type storage—data and programs are saved via Flash ROM, ensuring long-term retention without the need for batteries. On the PLC rack, three independent CMM401-0205 Ethernet modules are configured for communication with BAS and intelligent electromechanical maintenance systems. Additionally, a 4-channel independent DeviceNet master module, model CMM401-0106, is installed on the main rack to facilitate seamless communication with smart devices such as variable frequency drives, motor protectors, and soft starters—at a communication rate of 500 Kbps—fully meeting the requirements of field operations. Furthermore, a serial communication module, model CMM2001-0118, enables Modbus-based data exchange with multifunctional meters, allowing real-time upload of various meter parameters.

 

In the PLC cabinet, an industrial Ethernet switch NADS2210-2GS is installed. This switch features 2 Gigabit optical ports and 8 100-Mbps electrical ports. The PLCs and touch screens at both ends of the station are connected via this switch to enable seamless information exchange, ensuring that any touch screen can monitor and control the remote ventilation and air-conditioning equipment. The industrial switch in the PLC cabinet uses fiber-optic communication. For stations equipped with tunnel jet fans, a dedicated remote substation is set up in the control cabinet of the tunnel jet fan system, connecting to the nearby PLC control cabinet at the station through the NADS2102-SC optoelectronic converter.

 

III. Introduction to Solution Selection

 

Introduction to the Selection of NA400 Series PLC Modules >>>

 

Introduction to the NA2000 Series Substation Module Selection >>

 

 

Aoto Technology has always been committed to providing advanced automation solutions for the rail transit industry. The intelligent MCC system, with its high reliability, smart management capabilities, and energy-saving and environmentally friendly features, has become an outstanding solution for subway environmental control systems.

The future is here—smart control is now!

Aoto Technology, working with you to jointly create a new era of green and intelligent metro operations!

 

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