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UPS—Uninterruptible power supply
UPS Systems
Uninterruptible power supply (UPS) system is an energy storage device with a inverter as the main component, constant voltage-frequency output power protection equipment.The two mainly functions in computer and network systems applications: First, emergency use, to prevent a sudden power failure affecting the power grid properly work,and cause damage to the computer system; 2 is to remove the mains line surge, transient high-voltage, instantaneous low-voltage, transient over-voltage, wire noise and frequency offset, "the power pollution", to improve power quality, provide high-quality power to the computer system.
UPS classification
(1) back-up type (off line) UPS in the past, back-up UPS using the more common type. In the normal electricity supply, the electricity output by the UPS directly or through shunt coupling transformer output, the inverter does not work. At this point, UPS is equivalent to a poor regulator performance, non-exchange regulator function regulator, the utility voltage amplitude fluctuations only improved the frequency of the electricity grid instability, waveform distortion and other "electronic pollution "does not make any adjustments. When the city electricity abnormal or interrupted, UPS switches to battery power status, battery inverter Inverter DC to 220V by the stability of AC output. UPS power back-up style is always in the back-up power inverter state, it has a high utilization rate, noise are low, low price and so on, but the supply of poor quality.
(2)On-line UPS.Currently on-line UPS uses were more common. Whether the power normal or not, online style UPS power supply inverter is always in working condition. Inverter has the role of regulator and pressure regulator, so-line UPS power supply can act as a "cleansing" effect, but also has overload protection and strong anti-interference ability, stable and reliable supply of quality, but prices are expensive.
(3) Online Interactive UPS.line interactive UPS is based on-line UPS developed a new technology, the batteries, inverters and the output is always connected state. Electricity supply in the state, the inverter of phase for battery charging; City anomaly when the switch is disconnected, provided by the battery output. The UPS inverter and the output is always in a connected state, on the power play the role of filtering and clipping, has superior power protection. Online interactive UPS with voltage regulator precision, stable, intelligent, and security protection features.
UPS's use
Use the UPS Scientific and rational, so that UPS is in good working condition, prolong its service life, lower operating failure rate.
(1) fluctuations in the mains voltage range should be consistent with UPS input voltage range requirements. If the utility voltage fluctuations, and should be increased in most other former UPS protection measures (such as voltage regulators, etc.).
(2) To prevent the parasitic capacitive coupling interference, protection and personal safety equipment, UPS must be grounded and the grounding resistance of less than 4Ω.
(3) UPS working environment should be kept clean to avoid the harmful dust from internal components of the UPS corrosion. Work, the ambient temperature requirements for O ℃ ~ 40 ℃, humidity 1O% ~ 90%.
(4) UPS power supply in the initial use or after a long period of time put to use, you must first access to electricity, using UPS's own charge circuit to float on the UPS battery charge, charging time is normally 10 hours or more (large UPS needs The charging time longer). When the battery voltage reaches saturation only after put into normal use.
(5) UPS boot steps must be correct. sony vgp-bps5 battery UPS devices have a certain power within the rated operating current, surge current is too large, will shorten the life of the power devices and even burn. Therefore, the boot, the city should open the UPS power switch, and then open them one by one load. First open a big impact on the current load (such as monitors, printers, etc.), then opened a small impact on current load, and finally open the UPS front panel switch to UPS at the inverter working condition. Boot, can not load the same time open to all, can not start with a set.
(6) UPS shutdown sequence must be correct. Shutdown, shut down one by one before the load, and then close the UPS front panel switch, and finally close the UPS mains switch, can not be set off with.
(7) Note the use of backup UPS. Electrical work in the city state, UPS power supply through the bypass, the inverter does not work, UPS power supply fuse to protect equipment alone. If the UPS overload operation, when the market anomalies and transformed into electrical storage oil supply, because the inverter overload protection, UPS will break out due to overload, resulting in unnecessary losses. Therefore, to avoid overload UPS backup type to run.
(8) for standard UPS, when the abnormal electricity supply to UPS, it should promptly shut down the load; can not use an external battery pack to extend the time to avoid damage to the machine and battery.
(9) UPS for charged capacitive load, rather than for charged inductive loads. In exceptional circumstances, on-line UPS can take the appropriate inductive load, however, to increase the UPS capacity.
(10) UPS should not be a long time under full load or light load operation, the former will cause UPS inverter and rectifier filter is damaged, which is easy to damage the UPS batteries. With the appropriate load for the UPS rated capacity should be 50% -80%. 3 battery for use and maintenance of UPS batteries currently used mainly maintenance-free sealed lead-acid batteries. In practice, due to battery failure caused the proportion of UPS does not work more than 30%.
Therefore, proper use and maintenance battery is essential.
(1) every 4 to 6 months battery checked each battery terminal voltage and internal resistance, if a single battery terminal voltage below the minimum threshold voltage or when the battery internal resistance is greater than 80mΩ, should be replaced or balanced charge.
(2) Avoid over-current charging and over-voltage charge. The former may damage the internal positive and negative battery plates, the battery is decreased; which will a lot of battery electrolyte water electrolysis, so that the electrolyte concentration was increased, resulting in shortened battery life, and even burn.
(3) Avoid fast charger, which can cause the battery in a "transient over-current charge" and "transient over-voltage charging" state, causing the battery down or even damage the battery power available. Should be used with constant current and constant voltage charger role.
(4) to avoid short circuit discharge or excessive discharge. Otherwise, it will seriously damage the rechargeable dell xps m1530 battery capacity and charge storage capability, reduced service life. After discharge the battery to recharge in time.
(5) UPS long-term electricity supply in the state, shall from time to time on UPS power supply for a man to UPS power supply in the inverter mode of operation for some time to activate the battery charge and discharge capacity, extending the use of life.
(6) UPS long when not in use from time to time to recharge once. Battery charging time interval is closely related with the ambient temperature, the higher the temperature, the shorter the charging time interval.
(7) A battery should be O ℃ to 30 ℃ ambient temperature use. Ambient temperature is too high, will shorten its service life; too low, the release of the power will be greatly reduced.
(8) UPS in battery mode, the battery voltage is too low for automatic shutdown, boot time can not continue to use to avoid battery damage due to excessive discharge.
(9) UPS is in battery mode, the battery discharge current is not too small, otherwise it will result in the rapid shortening battery life and battery internal resistance anomaly increases.
UPS's purchase
(1) to confirm the type of UPS needed for financial, securities, telecommunications, transportation and other important industries, should be selected high performance, high security on-line type UPS; for network users, in addition to consider the options-line UPS, it can also select the line Interactive UPS; For home users the option of back-up type UPS.
(2) to determine the power needed to calculate UPS UPS dell inspiron e1505 battery power is: UPS power = power × safety factor of the actual equipment. Among them, the safety factor is the launch power of large equipment, the general election 1.5.
(3) to consider development outside the margin takes into account the actual load, but also considering the future increase in equipment capacity increase caused by the problem, so UPS power should be based on the existing load to increase to 15% margin.
(4) Select the best choice for the brand and after-sales service warranty long time and thoughtful after-sales service UPS. In this way, suppliers can easily carry out its maintenance and repair products in a timely manner, thus ensuring the user's normal use.
About the Author
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