Series 7400 Single Phase 1+N UPS

Bypass

 

 

 

 

Supply

 

 

 

 

Mains

(a.c)

(d.c)

(a.c)

STATIC

Supply

RECTIFIER

 

INVERTER

SWITCH

 

 

 

 

 

(d.c)

 

 

 

 

BATTERY

 

 

UPS

Output Supply

1.2.27400 Module Design

Figure 1: Series 7400 UPS Single Module Block Diagram

As previously mentioned, each of the two modules forming the one-plus-onesystem is basically a standard single module 7400 series UPS. This section describes an individual module’s operating principles - the effects of the additional parallel control facilities on the standard module are described later.

The UPS basically operates as an AC-DC-AC converter (see figure 1). The first conversion stage (from AC to DC) uses a 3 Phase, fully-controlled SCR bridge rectifier to convert the incoming mains supply into a regulated 432V DC busbar.

The DC busbar produced by the rectifier provides both battery charging power and power to the inverter section -which is of a transistorised / IGBT based pulse width modulation (PWM) design and provides the second conversion phase; i.e. reconverting the DC busbar voltage back into an AC voltage waveform.

During normal operation both the rectifier and inverter sections are active and provides regulated load power whilst simultaneously float charging the battery. In the event of a mains power failure, the rectifier becomes inoperative and the inverter is powered solely from the battery. Critical load power is maintained under these conditions until the battery is fully discharged, whereupon the UPS shuts down. The end of battery discharge is assumed when the battery voltage falls to 320Vdc. In case of 80 to 125 kVA, 1 PH models the end of discharge is taken as 330Vdc.

The period for which the load can be maintained following a mains power failure is known as the system’s ‘Autonomy Time’ and is dependent upon both the battery A/Hr capacity and the applied percentage load. It is usual in larger installations to provide an alternative UPS input power source from a stand-by generator when the mains supply fails. Once such a generator has been brought on-line, and the UPS input power has been re-established, the batteries immediately begin to recharge. Modern generators can be started and brought on-line very quickly and where such a facility is incorporated into the UPS installation it results in short battery discharge periods and correspondingly rapid recharge times.

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Emerson user manual 2 7400 Module Design, Series 7400 UPS Single Module Block Diagram
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7400 specifications

The Emerson 7400 is a state-of-the-art control system designed for industrial applications, offering enhanced performance and reliability in process automation. This robust device is a part of Emerson's larger DeltaV system, known for its scalability and flexibility in various operational environments.

One of the main features of the Emerson 7400 is its advanced control capabilities, which enable precise management of complex industrial processes. The system is built to support a wide range of control strategies, including PID control, advanced control algorithms, and model predictive control, allowing for optimized performance tailored to specific operational requirements. This versatility makes it suitable for industries such as oil and gas, chemical processing, pharmaceuticals, and more.

The Emerson 7400 utilizes cutting-edge technologies to ensure seamless integration and communication with other components within a facility. Its open architecture supports a wide array of field devices, enhancing the interoperability of the entire control system. The integration of Ethernet-based communication protocols is another notable characteristic, facilitating high-speed data transfer and real-time monitoring, streamlining operations, and improving decision-making processes.

With a focus on safety and reliability, the Emerson 7400 is designed with built-in redundancy features. These include dual power supplies and network interfaces, ensuring continuous operation even in the event of component failure. This redundancy is crucial for industries where downtime could result in substantial financial losses or safety hazards.

The user interface of the Emerson 7400 is another highlight, combining intuitive design with powerful analytics capabilities. The system offers advanced visualization tools and customizable dashboards, providing operators with critical insights into process performance and enabling proactive management of potential issues.

Furthermore, the Emerson 7400 supports industry 4.0 initiatives through data analytics and cloud integration. This allows for predictive maintenance, improving equipment longevity and reducing operational costs. The system’s data collection and analysis capabilities empower organizations to leverage big data for enhanced productivity and efficiency.

In summary, the Emerson 7400 is a sophisticated control system that brings together advanced technologies, robust features, and a commitment to operational excellence. Its reliability, adaptability, and integration capabilities position it as a leading choice for industries seeking to enhance their automation processes while ensuring safety and efficiency.
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