UPS is an uninterruptible power supply, which is an important part of the information technology field. It is a high-tech power supply equipment integrating power technology, control technology, signal detection and communication technology. It is widely used in computer and network systems, telecommunications/mobile communications and various automatic production assembly lines and other application fields. Computer technology is developing rapidly, local area network and its applicationsIt is becoming more and more popular, but people have not yet paid enough attention to the power supply systems and power configuration of LANs. According to investigations by relevant departments, the most common problems in LANs are often caused by power outages and power abnormalities. According to test statistics from professional institutions, a computer encounters various power problems more than 120 times a month on average. In order to ensure the safe operation of the LAN, UPS must be installed in more important applications to prevent data loss and errors caused by sudden power outage. Therefore, how to properly configure and select uninterruptible power supply devices (UPSs) in the LAN has become one of the key factors in the normal operation of the LAN.
In a local area network, the main purpose of configuring UPS is to provide stable, reliable and high-quality power supply to all types of power equipment in the local area network. It is mainly reflected in the following three aspects:
(1) Provide backup power for all types of power consumption equipment to prevent sudden power outages from causing damage to the local area network and affecting normal operation;
(2) It can eliminate the phenomenon such as surge, harmonic interference, frequency drift, intermittent waveform, excessive or low voltage generated in the power supply system, improve the power quality, and prevent the electronic components of various equipment in the local area network from destructive damage;
(3) UPS can also suppress clutter such as high-frequency signals generated by other power equipment in the power grid, so as to avoid failures such as data transmission failure caused by clutter and improve network reliability.
1 Functions and features of UPS >
1.1 The role of UPS
The main functions of UPS are as follows:
(l) When the mains power is interrupted, the battery it carries can be used to convert DC power into 220V AC power through the inverter circuit to supply power to the computer and network system to ensure that the computer and network system can operate normally.
(2) It has a voltage stabilization effect on the mains electricity and can stabilize the voltage when the power grid voltage fluctuates.
(3) It can suppress power pollution such as power harmonic interference, instantaneous voltage drop, high-voltage surge, voltage waveform distortion, electromagnetic interference, etc., and provide computers and other equipment with stable voltage and pure waveform power supply, ensuring the normal operation of computers and network systems and the data is not disturbed.
1.2 Features of UPS
For a high-quality UPS power supply system, it should have the following characteristics:
(l)High reliability
The system should have the power supply capacity that can provide 365×24 continuous high-quality UPS inverter power supply. This means that during the operation of the UPS power supply system, no instantaneous power supply interruption/power outage accidents are allowed, nor are there any situations where ordinary mains power supply directly to the user's load via AC bypass. To this end, the UPS power supply system is required to meet the following requirements:
Due to the low failure rate of the UPS stand-alone machine itself, the average fault-free working time (MTBF) of large UPS products is currently 200,000 to 400,000 hours.
The "N+1" UPS redundant parallel system with high fault tolerance functions is used to further improve the reliability of the UPS power supply system (the typical MTBF value of the "1+1" redundant parallel system can reach 1.4 million to 2 million hours).
In the entire UPS power supply system, there should be no single point bottleneck failure risk.
It allows maintenance and maintenance operations without power outage under continuous power supply of UPS inverter power supply.
In case of a short circuit failure on the user equipment side, the impact of the failure should be reduced to the smallest possible range.
(2) High anti-interference
UPS power supply systems can enable Internet devices to obtain high "utilization rate" and create an excellent operating environment for them.
A large number of operational practices have shown that power interference is one of the important reasons for the decline in the "availability" of Internet devices. It should be noted here that power interference not only comes from ordinary mains power grids, but also comes from the imperfectly designed UPS itself and the user's Internet equipment itself. This is because servers, disk array machines and switches configured in IDC and MDC rooms are built-in switching power supplies. This rectified filtered nonlinear load will reflect 3 to 23 low harmonic interference to the UPS power supply system, which may lead to bad consequences of reducing voice quality. Practice has proved that power interference occurs in too large and over-frequency, in mild cases, it will lead to implicit failures such as the reduction in the Internet transmission rate and the increase in the packet loss rate of the network server, which will lead to the forced Internet equipment being "derating the amount" state, which will lead to the network paralysis in severe cases.
It can be seen that the rapid development of high-speed information network technology has put forward stricter requirements on the power quality that UPS power supply systems can provide.2 UPS classification>
UPS is divided into three types: backup, online and online interactive.
(1) Backup UPS
When the mains power is normal, the mains power supplies power to the load equipment, andRecharge the battery floating. When the mains voltage fluctuates more than the specified value, the inverter circuit will be started when converting the DC power of the battery into a stable AC power output to supply power to the load. Since the backup UPS is usually powered directly by the mains power supply to the load, it is impossible to eliminate the electrical pollution such as surges, peaks, frequency drifts on the mains power grid, and the capacity is relatively small. However, its technology is simple, low cost, and relatively low price, and is used in many occasions where voltage stability is not high.
(2) Online UPS
The online UPS has always kept its inverter in working state. When the mains are normal, it first converts the mains AC to DC through the circuit, and then converts the DC to sine wave AC through the inverter to power the load. Under power supply, it can also regulate the output and prevent electromagnetic interference, and also charge the battery floatingly through the charging circuit. When power is outage, the DC power of the battery is used, so there is no switching time for the inverter, so it is suitable for occasions where there are high requirements for power supply.
(3) Online interactive UPS
This is an intelligent UPS. In addition to the function of an online UPS, it can also automatically detect the voltage of mains and provide high-precision sine wave alternating current output. Online interactive UPS also has the function of communicating with computers. Some can also connect to the Internet and manage the UPS through the network. It can automatically adjust the working status and output status of the UPS itself according to the working status of the computer and network system. When the UPS fails, it can notify the computer system to start a redundant backup power supply, so it is called an intelligent UPS. It is generally used in network systems where servers, routers, switches of large backbone networks, and some workstations have high power requirements. It will greatly improve the reliability of computer systems.
3 Development and application of UPS technology >
3.1 Intelligent UPS
With the continuous development of electronic technology, many new technologies and new components are constantly applied to UPS products. Therefore, the development of UPS products has taken the old path of blindly pursuing high electrical performance and has begun to pursue high reliability and stability of products.
Current online interactive UPSs have the function of communicating with computers through the RS232/RS485 or Ethernet network interface. With the corresponding software, the UPS can be monitored locally/remotely, greatly improving the usability of UPS. Driven by the rapid development of computer networks and communications industries, today's UPS has developed into an intelligent UPS based on the large number of microprocessor monitoring technologies. The so-called "intelligent UPS" refers to adding a communication interface to the UPS host, using it to connect it with the corresponding communication interfaces on computer servers, routers, gateways and other devices through a dedicated communication cable or modem, establishing a two-way communication regulation and management function, and installing power monitoring software that can adapt to various operating platforms to manage the operation and operation of the UPS, and improving the UPS efficiency. Intelligent UPS can monitor the UPS input and output voltage, input and output frequency, output current, battery voltage, UPS host temperature and other operating parameters in real time, and automatically archive the data in the computer after a UPS failure or battery power supply specified time, exit and close the system, and can notify system administrators through paging, E-mail, etc. For networked smart UPS, it is also necessary to configure the corresponding network card and include UPS management into the network management system.
3.2 Intelligent management of UPS
In order to achieve the purpose of UPS protecting the entire LAN system, the intelligent management function of UPS is particularly important. Therefore, intelligent UPS with internal configuration of microprocessors is a new trend in the development of UPS today. It combines the internal hardware and software of UPS, and uses interfaces or network-specific adapters to remotely and intelligently control the operating status of UPS by the system administrator to greatly improve the functions of UPS. For example, it can be used to monitor the output voltage frequency, mains voltage frequency, battery status, and fault recording of the UPS. It can also detect the battery through software, automatically charge and discharge, and switch on and off the battery remotely.
3.3 UPS monitoring technology
To realize UPS management, an effective power management system must be established, that is, establishing a physical information transmission interface, logical communication protocol, and management of UPS information database. A complete power management system is usually composed of power management software and smart accessories. In other words, the monitoring of smart UPS is composed of hardware and software monitoring.
General UPS monitoring technology can be divided into the following types:
(1) Monitoring technology based on serial communication method
Serial communication is a traditional UPS software/attachment communication method, mostly used in small and medium-power UPS solutions. Its advantages are safety, reliability and simple installation. However, the limitation of this communication method is that it is short communication distance, which is mainly used for monitoring UPS in the local area network and the security protection of the connected computers.
(2) Web-based monitoring technology
Web-based software/attachment monitoring technology was born with the development of the Internet, and the attachments are mainly Web/SNMP Management Card. In data centers or large computer networks, UPS usually protects multiple computers. Communication with computers and UPS through TCP/IP, and the system administrator monitors UPS distributed in the WAN range through a web browser, and regularly generates UPS status reports.
(3) Monitoring technology based on SNMP
SNMP-based software/attachment monitoring technology is closely related to the development of network management products, and is mainly used in enterprise-level networks with a large number of UPSs and a wide distribution. Apply a network card to the UPS or directly integrate the SNMP adapter into the UPS, and use the UPS as an independent node in the network for control and diagnosis.
(4) Monitoring technology based on Modem/telephone/paging network method
Dial-up Internet access, use an Internet browser to realize remote monitoring of UPS, display the working status of UPS in various ways, start/shut down, and self-test regularly, alarm in various ways in the case of failure, and cancel the shutdown action after recovery, and send corresponding information.
3.4 Development trends of UPS monitoring technology
The tight integration of UPS systems with Internet technology makes it more meaningful than ever to increase the ease of use of the entire information system. Although traditional technologies such as telephone dialing, SNMP, Telnet and others have enabled remote and centralized monitoring of UPS, these technologies usually require specific device configuration and operational skills. With the popularity of the Internet, monitoring UPS using browsers will become the mainstream of UPS monitoring technology.
Due to the widening and globalization of networks in the future, the complexity of networks will inevitably lead to the complexity of networks, and various forms of network systems will be connected together. As part of the network system, UPS is required to be able to monitor on various network platforms. Moreover, with the rapid development of the Internet, intranet and e-commerce, users' requirements for network availability will become higher and higher, allowing UPS to extend from the protection of network key devices to the protection of the entire network path. Therefore, in addition to providing complete monitoring and protection functions, monitoring software must also support mainstream operating systems, cross-platform operations and have plug-and-play functions; support mainstream databases and application software; integrate with mainstream server management tools; and integrate with mainstream network management systems.4 LAN UPS selection>
4.1 Principles of UPS selection
A typical LAN usually has a server, network switch, router, network management workstation, data storage, PC, and printer.and various other terminal devices. Since the number of nodes in the LAN and each node may be scattered in different locations, there will be multiple UPSs located in different locations that need maintenance. Therefore, the UPS used in the LAN has its own characteristics and must be paid attention to when selecting and configuring them.
Generally, the central computer room of the LAN should adopt a UPS centralized power supply method with a medium capacity of 10 to 20kVA, and use dual-machine hot backup or parallel power supply to ensure safe and reliable power supply. For many PCs, routers, printers and other equipment that cannot be set up in a centralized manner in the LAN, a decentralized small-capacity UPS should be set up on site to provide power guarantee, and an online UPS device that is not polluted to the power grid should be preferred. This is because backup or interactive UPS are both low-end products, and their technical performance such as reliability and failure rate are not as good as online UPS; in addition, when encountering a relatively harsh power grid environment, it is basically impossible to suppress the transmission of power grid interference to network equipment, which is easy to affect the normal operation of the local area network.
4.2 Things to note when choosing UPS
The layout of load equipment in the LAN should be reasonably set up, and a single large-capacity UPS centralized power supply method should be adopted as much as possible. In this way, not only can the investment expenses per unit power of UPS can be reduced, but the failure rate of UPS can also be reduced, and the utilization rate of the battery can be improved.
It is necessary to choose UPS models that allow a larger fluctuation range of the mains power supply, and consider the specific requirements of different power distribution systems of the LAN to adapt to their loading capabilities.
You should choose a UPS model with strong overload capability and anti-output short circuit capability, which can reduce the chance of UPS switching operation and reduce the failure rate of UPS.
In the LAN, appropriately configure the suppressor against transient surges to better protect network equipment, and use UPS models with low output neutral to ground potential to obtain the highest data transmission rate as possible and reduce the bit error rate of data transmission.
According to the requirements of centralized monitoring at different levels in the LAN, intelligent UPS models with different network control functions should be configured to meet the needs of network functions, and at the same time, investment waste can be avoided.
5 UPS maintenance >
UPS has been widely used now. UPS is a simple but easily damaged device. Scientific use and maintenance of UPS can improve the usability of UPS and extend the service life of UPS. The following points should be paid attention to under normal use:
(1) Do not use it to connect inductive loads, because the starting current of inductive loads is often 3 to 5 times the rated current during normal operation, which can easily cause instantaneous overload of the UPS and affect the life of the UPS.
(2) Do not run at full load. Using UPS for a long time will directly affect the life of the UPS. When choosing UPS, UPS is generally selected at 120% to 150% of the rated load power. For example, 1.5kW UPS is generally selected at 1kW load.
(3) Maintain the battery well. The batteries used in most UPSs are maintenance-free sealed lead-acid batteries. Although it is maintenance-free, if not properly maintained, the battery life will also be shortened. For UPS, especially backup UPS, if the local power outage is not out for a long time, it is necessary to manually interrupt the power supply regularly (usually three months) to discharge the battery to maintain the battery's storage performance. Of course, a dedicated person is responsible for this process.
(4) Pay attention to lightning protection, ensure effective shielding and good grounding of the UPS to protect the safety of the internal circuits and batteries of the UPS.
(5) Pay attention to electricity safety and do not disassemble and install and maintain UPS products at will to avoid safety accidents. Because the output of UPS is generally 220V AC, there is a risk of electric shock, so professional service personnel are generally required to repair it.
6 Conclusion >
Correct and safe use and maintenance of UPS will ensure that computers, networks and other devices powered by UPS will be protected safely, improve the reliability and stability of load equipment and data, and give users a reliable use environment to create good social and economic benefits. Article entry: aaadxmm Editor in charge: aaadxmm
In a local area network, the main purpose of configuring UPS is to provide stable, reliable and high-quality power supply to all types of power equipment in the local area network. It is mainly reflected in the following three aspects:
(1) Provide backup power for all types of power consumption equipment to prevent sudden power outages from causing damage to the local area network and affecting normal operation;
(2) It can eliminate the phenomenon such as surge, harmonic interference, frequency drift, intermittent waveform, excessive or low voltage generated in the power supply system, improve the power quality, and prevent the electronic components of various equipment in the local area network from destructive damage;
(3) UPS can also suppress clutter such as high-frequency signals generated by other power equipment in the power grid, so as to avoid failures such as data transmission failure caused by clutter and improve network reliability.
1.1 The role of UPS
The main functions of UPS are as follows:
(l) When the mains power is interrupted, the battery it carries can be used to convert DC power into 220V AC power through the inverter circuit to supply power to the computer and network system to ensure that the computer and network system can operate normally.
(2) It has a voltage stabilization effect on the mains electricity and can stabilize the voltage when the power grid voltage fluctuates.
(3) It can suppress power pollution such as power harmonic interference, instantaneous voltage drop, high-voltage surge, voltage waveform distortion, electromagnetic interference, etc., and provide computers and other equipment with stable voltage and pure waveform power supply, ensuring the normal operation of computers and network systems and the data is not disturbed.
1.2 Features of UPS
For a high-quality UPS power supply system, it should have the following characteristics:
(l)High reliability
The system should have the power supply capacity that can provide 365×24 continuous high-quality UPS inverter power supply. This means that during the operation of the UPS power supply system, no instantaneous power supply interruption/power outage accidents are allowed, nor are there any situations where ordinary mains power supply directly to the user's load via AC bypass. To this end, the UPS power supply system is required to meet the following requirements:
Due to the low failure rate of the UPS stand-alone machine itself, the average fault-free working time (MTBF) of large UPS products is currently 200,000 to 400,000 hours.
The "N+1" UPS redundant parallel system with high fault tolerance functions is used to further improve the reliability of the UPS power supply system (the typical MTBF value of the "1+1" redundant parallel system can reach 1.4 million to 2 million hours).
In the entire UPS power supply system, there should be no single point bottleneck failure risk.
It allows maintenance and maintenance operations without power outage under continuous power supply of UPS inverter power supply.
In case of a short circuit failure on the user equipment side, the impact of the failure should be reduced to the smallest possible range.
(2) High anti-interference
UPS power supply systems can enable Internet devices to obtain high "utilization rate" and create an excellent operating environment for them.
A large number of operational practices have shown that power interference is one of the important reasons for the decline in the "availability" of Internet devices. It should be noted here that power interference not only comes from ordinary mains power grids, but also comes from the imperfectly designed UPS itself and the user's Internet equipment itself. This is because servers, disk array machines and switches configured in IDC and MDC rooms are built-in switching power supplies. This rectified filtered nonlinear load will reflect 3 to 23 low harmonic interference to the UPS power supply system, which may lead to bad consequences of reducing voice quality. Practice has proved that power interference occurs in too large and over-frequency, in mild cases, it will lead to implicit failures such as the reduction in the Internet transmission rate and the increase in the packet loss rate of the network server, which will lead to the forced Internet equipment being "derating the amount" state, which will lead to the network paralysis in severe cases.
It can be seen that the rapid development of high-speed information network technology has put forward stricter requirements on the power quality that UPS power supply systems can provide.2 UPS classification>
UPS is divided into three types: backup, online and online interactive.
(1) Backup UPS
When the mains power is normal, the mains power supplies power to the load equipment, andRecharge the battery floating. When the mains voltage fluctuates more than the specified value, the inverter circuit will be started when converting the DC power of the battery into a stable AC power output to supply power to the load. Since the backup UPS is usually powered directly by the mains power supply to the load, it is impossible to eliminate the electrical pollution such as surges, peaks, frequency drifts on the mains power grid, and the capacity is relatively small. However, its technology is simple, low cost, and relatively low price, and is used in many occasions where voltage stability is not high.
(2) Online UPS
The online UPS has always kept its inverter in working state. When the mains are normal, it first converts the mains AC to DC through the circuit, and then converts the DC to sine wave AC through the inverter to power the load. Under power supply, it can also regulate the output and prevent electromagnetic interference, and also charge the battery floatingly through the charging circuit. When power is outage, the DC power of the battery is used, so there is no switching time for the inverter, so it is suitable for occasions where there are high requirements for power supply.
(3) Online interactive UPS
This is an intelligent UPS. In addition to the function of an online UPS, it can also automatically detect the voltage of mains and provide high-precision sine wave alternating current output. Online interactive UPS also has the function of communicating with computers. Some can also connect to the Internet and manage the UPS through the network. It can automatically adjust the working status and output status of the UPS itself according to the working status of the computer and network system. When the UPS fails, it can notify the computer system to start a redundant backup power supply, so it is called an intelligent UPS. It is generally used in network systems where servers, routers, switches of large backbone networks, and some workstations have high power requirements. It will greatly improve the reliability of computer systems.
3.1 Intelligent UPS
With the continuous development of electronic technology, many new technologies and new components are constantly applied to UPS products. Therefore, the development of UPS products has taken the old path of blindly pursuing high electrical performance and has begun to pursue high reliability and stability of products.
Current online interactive UPSs have the function of communicating with computers through the RS232/RS485 or Ethernet network interface. With the corresponding software, the UPS can be monitored locally/remotely, greatly improving the usability of UPS. Driven by the rapid development of computer networks and communications industries, today's UPS has developed into an intelligent UPS based on the large number of microprocessor monitoring technologies. The so-called "intelligent UPS" refers to adding a communication interface to the UPS host, using it to connect it with the corresponding communication interfaces on computer servers, routers, gateways and other devices through a dedicated communication cable or modem, establishing a two-way communication regulation and management function, and installing power monitoring software that can adapt to various operating platforms to manage the operation and operation of the UPS, and improving the UPS efficiency. Intelligent UPS can monitor the UPS input and output voltage, input and output frequency, output current, battery voltage, UPS host temperature and other operating parameters in real time, and automatically archive the data in the computer after a UPS failure or battery power supply specified time, exit and close the system, and can notify system administrators through paging, E-mail, etc. For networked smart UPS, it is also necessary to configure the corresponding network card and include UPS management into the network management system.
3.2 Intelligent management of UPS
In order to achieve the purpose of UPS protecting the entire LAN system, the intelligent management function of UPS is particularly important. Therefore, intelligent UPS with internal configuration of microprocessors is a new trend in the development of UPS today. It combines the internal hardware and software of UPS, and uses interfaces or network-specific adapters to remotely and intelligently control the operating status of UPS by the system administrator to greatly improve the functions of UPS. For example, it can be used to monitor the output voltage frequency, mains voltage frequency, battery status, and fault recording of the UPS. It can also detect the battery through software, automatically charge and discharge, and switch on and off the battery remotely.
3.3 UPS monitoring technology
To realize UPS management, an effective power management system must be established, that is, establishing a physical information transmission interface, logical communication protocol, and management of UPS information database. A complete power management system is usually composed of power management software and smart accessories. In other words, the monitoring of smart UPS is composed of hardware and software monitoring.
General UPS monitoring technology can be divided into the following types:
(1) Monitoring technology based on serial communication method
Serial communication is a traditional UPS software/attachment communication method, mostly used in small and medium-power UPS solutions. Its advantages are safety, reliability and simple installation. However, the limitation of this communication method is that it is short communication distance, which is mainly used for monitoring UPS in the local area network and the security protection of the connected computers.
(2) Web-based monitoring technology
Web-based software/attachment monitoring technology was born with the development of the Internet, and the attachments are mainly Web/SNMP Management Card. In data centers or large computer networks, UPS usually protects multiple computers. Communication with computers and UPS through TCP/IP, and the system administrator monitors UPS distributed in the WAN range through a web browser, and regularly generates UPS status reports.
(3) Monitoring technology based on SNMP
SNMP-based software/attachment monitoring technology is closely related to the development of network management products, and is mainly used in enterprise-level networks with a large number of UPSs and a wide distribution. Apply a network card to the UPS or directly integrate the SNMP adapter into the UPS, and use the UPS as an independent node in the network for control and diagnosis.
(4) Monitoring technology based on Modem/telephone/paging network method
Dial-up Internet access, use an Internet browser to realize remote monitoring of UPS, display the working status of UPS in various ways, start/shut down, and self-test regularly, alarm in various ways in the case of failure, and cancel the shutdown action after recovery, and send corresponding information.
3.4 Development trends of UPS monitoring technology
The tight integration of UPS systems with Internet technology makes it more meaningful than ever to increase the ease of use of the entire information system. Although traditional technologies such as telephone dialing, SNMP, Telnet and others have enabled remote and centralized monitoring of UPS, these technologies usually require specific device configuration and operational skills. With the popularity of the Internet, monitoring UPS using browsers will become the mainstream of UPS monitoring technology.
Due to the widening and globalization of networks in the future, the complexity of networks will inevitably lead to the complexity of networks, and various forms of network systems will be connected together. As part of the network system, UPS is required to be able to monitor on various network platforms. Moreover, with the rapid development of the Internet, intranet and e-commerce, users' requirements for network availability will become higher and higher, allowing UPS to extend from the protection of network key devices to the protection of the entire network path. Therefore, in addition to providing complete monitoring and protection functions, monitoring software must also support mainstream operating systems, cross-platform operations and have plug-and-play functions; support mainstream databases and application software; integrate with mainstream server management tools; and integrate with mainstream network management systems.4 LAN UPS selection>
4.1 Principles of UPS selection
A typical LAN usually has a server, network switch, router, network management workstation, data storage, PC, and printer.and various other terminal devices. Since the number of nodes in the LAN and each node may be scattered in different locations, there will be multiple UPSs located in different locations that need maintenance. Therefore, the UPS used in the LAN has its own characteristics and must be paid attention to when selecting and configuring them.
Generally, the central computer room of the LAN should adopt a UPS centralized power supply method with a medium capacity of 10 to 20kVA, and use dual-machine hot backup or parallel power supply to ensure safe and reliable power supply. For many PCs, routers, printers and other equipment that cannot be set up in a centralized manner in the LAN, a decentralized small-capacity UPS should be set up on site to provide power guarantee, and an online UPS device that is not polluted to the power grid should be preferred. This is because backup or interactive UPS are both low-end products, and their technical performance such as reliability and failure rate are not as good as online UPS; in addition, when encountering a relatively harsh power grid environment, it is basically impossible to suppress the transmission of power grid interference to network equipment, which is easy to affect the normal operation of the local area network.
4.2 Things to note when choosing UPS
The layout of load equipment in the LAN should be reasonably set up, and a single large-capacity UPS centralized power supply method should be adopted as much as possible. In this way, not only can the investment expenses per unit power of UPS can be reduced, but the failure rate of UPS can also be reduced, and the utilization rate of the battery can be improved.
It is necessary to choose UPS models that allow a larger fluctuation range of the mains power supply, and consider the specific requirements of different power distribution systems of the LAN to adapt to their loading capabilities.
You should choose a UPS model with strong overload capability and anti-output short circuit capability, which can reduce the chance of UPS switching operation and reduce the failure rate of UPS.
In the LAN, appropriately configure the suppressor against transient surges to better protect network equipment, and use UPS models with low output neutral to ground potential to obtain the highest data transmission rate as possible and reduce the bit error rate of data transmission.
According to the requirements of centralized monitoring at different levels in the LAN, intelligent UPS models with different network control functions should be configured to meet the needs of network functions, and at the same time, investment waste can be avoided.
UPS has been widely used now. UPS is a simple but easily damaged device. Scientific use and maintenance of UPS can improve the usability of UPS and extend the service life of UPS. The following points should be paid attention to under normal use:
(1) Do not use it to connect inductive loads, because the starting current of inductive loads is often 3 to 5 times the rated current during normal operation, which can easily cause instantaneous overload of the UPS and affect the life of the UPS.
(2) Do not run at full load. Using UPS for a long time will directly affect the life of the UPS. When choosing UPS, UPS is generally selected at 120% to 150% of the rated load power. For example, 1.5kW UPS is generally selected at 1kW load.
(3) Maintain the battery well. The batteries used in most UPSs are maintenance-free sealed lead-acid batteries. Although it is maintenance-free, if not properly maintained, the battery life will also be shortened. For UPS, especially backup UPS, if the local power outage is not out for a long time, it is necessary to manually interrupt the power supply regularly (usually three months) to discharge the battery to maintain the battery's storage performance. Of course, a dedicated person is responsible for this process.
(4) Pay attention to lightning protection, ensure effective shielding and good grounding of the UPS to protect the safety of the internal circuits and batteries of the UPS.
(5) Pay attention to electricity safety and do not disassemble and install and maintain UPS products at will to avoid safety accidents. Because the output of UPS is generally 220V AC, there is a risk of electric shock, so professional service personnel are generally required to repair it.
Correct and safe use and maintenance of UPS will ensure that computers, networks and other devices powered by UPS will be protected safely, improve the reliability and stability of load equipment and data, and give users a reliable use environment to create good social and economic benefits. Article entry: aaadxmm Editor in charge: aaadxmm