Uninterruptible power supply is UPS. Many friends have purchased the uninterrupted power supply for a period of time and there will always be problems and failures. At present, UPS has two major categories, external and built-in. According to the nature of its work, it is divided into backup and online. In the process of uninterrupted power supply maintenance , the most difficult problem to solve is the lack of drawing materials. Sometimes it takes a lot of trouble to find the drawings, and the physical object may not be able to meet, so in the uninterrupted power supply maintenance , blindly It is unrealistic to rely on drawings or surveying lines. Uninterruptible power supply 1. When the grid voltage is normal, the mains voltage is supplied to the load through the UPS regulator. The good UPS itself is a good AC regulator and improves the quality of the power supply. At the same time, it also charges the battery inside the UPS. Reserve energy. 2. When the grid voltage is abnormal (undervoltage, overvoltage, power failure, interference, etc.) The inverter of the UPS converts the DC power of the battery into AC power to maintain the power supply to the load. 3. The UPS automatically switches between grid power supply and battery power supply to ensure uninterrupted power supply to the load. And you can choose the acceptable switching time according to the precision of the equipment. Uninterruptible power supply features UPS is aimed at the reliability requirements of China's power grid environment and network monitoring and network systems, medical systems and other power supplies, overcomes the increasingly severe problems of the power supply grid environment caused by the centralized power supply of large and medium-sized computer network systems, and is developed with new digital technologies. The third generation of industrial frequency pure online intelligent UPS. The DC power supply is a device that maintains a constant current in the circuit. Such as dry batteries, batteries, DC generators. UPS and DC power supply are important power supply support devices for enterprises. The traditional maintenance management includes: 1 The appearance of daily inspections, regular replacement of battery, filter capacitors, fans and other consumables, and battery activation during major repairs; 2 Renovation or replacement of equipment Use advanced tools to test battery performance. This kind of management method has high input costs for enterprises and large workload for maintenance personnel. It is not easy to grasp equipment operation status and key data in real time, and equipment accident prevention capability is low. The implementation of online maintenance management can avoid the deficiencies of the traditional methods and gain good benefits. UPS in Chinese means "uninterruptible power supply", which is the abbreviation of "UninterruptiblePowerSystem/UninterruptiblePowerSupply" in English. It can ensure that the computer system will continue to work for a period of time after the power outage so that the user can save the data in an emergency so that the user will not affect the work or lose due to the power outage. data. Uninterruptible power supply applications Uninterrupted power supply is now widely used: mines, aerospace, industrial, communications, defense, hospitals, computer business terminals, network servers, network equipment, data storage equipment, UPS uninterruptible power supply, emergency lighting systems, railways, shipping, transportation, Power plants, substations, nuclear power plants, fire safety alarm systems, wireless communication systems, program-controlled switches, mobile communications, solar energy storage conversion equipment, control equipment and their emergency protection systems, personal computers and other fields. Uninterrupted power supply repair How to repair UPS without drawing information How do uPs be overhauled in this situation? The author believes that adopting a focused census method is a good method. The key census method is to find the fault directly on the circuit board according to the fault frequency of the components. Another prerequisite for using census inspections is that it must master the test data of common components in UPs (preferably with corresponding spare parts). The main difficulty is that the quality of integrated circuits is not easy to judge (because many digital integrated circuits in uPS depend on Tests on road resistance or open circuit resistance sometimes do not reflect good or bad). However, there are not many kinds of integrated circuits in uPs. If you can prepare common models, you can use the comparison method or replacement method when troubleshooting. Commonly used integrated circuit models are: SG3524, LM339, LM393, NE555, NE556, LM317 (337), 78, 79 series of three-terminal regulator (mainly 7812, with a microprocessor UPS to 7805), LM324, uA74l , uA4558 and so on. If conditional can prepare some 4000 series and 74Ls series of digital integrated circuits, mainly MC140ll, MCl4069, MCl4013, MCl4066, SN74LS00, SN74LS02, SN74LS04 and SN74LS74 and so on. According to statistics made by a large number of maintenance practices, the components in the UPS are ranked in descending order of frequency of failures: batteries (ie, maintenance-free lead-acid batteries in the battery, including false positives due to over-discharge or charging circuit failures. Damage), AC line into the circuit (including fuses, varistors, power switches, etc.), inverter tube (including push tube), power resistance, sampling transformers, small and medium power two, transistor, integrated circuit, adjustable resistance, relays, Electrolytic capacitor, low power resistor, main power transformer. Therefore, when repairing a damaged uPS, if you cannot find the circuit drawing, you can directly go to the machine to find a fault. In the census, you must also pay attention to the inspection of some false and false welding faults. Can generally use the contrast method (compared with good components) and replacement method (replace with good components) to judge, as long as the UPS has no artificial fault (such as the adjustment of the adjustable components, etc.) and adjustment failure, generally can be compared Solve the problem quickly. [Example 1] Symptoms The sTKuPs-500 uPs can be put into the regulation state after the AC power is turned on, but it cannot be reversed after the power failure. Only when the internal relay of the unit is sounded for a few times, there is no movement. Analysis and overhaul First check the battery voltage inside the machine, normal, no obvious damage to the components on the circuit board, four MJ4502 inverter tube is also no exception. It is also normal to test the Vcc supply of each integrated circuit after power-on, but there is no sign of reversal, and it is suspected that the IC is damaged. Because it is difficult to find the maintenance drawings of the aircraft, it is difficult to find faults by using the road measurement judgment method. Therefore, a replacement method is used to find faults. The first to replace is the control core Icl (sG3524) of the inverter circuit. The KA3524 produced by Samsung is used for direct test exchange. The inverter is normal immediately after power on, which proves that the fault of the aircraft is SG3524 damage. After renewal of Icl, troubleshooting. Uninterrupted power supply maintenance tips Maintenance of some common faults of UPS 1. Mains power is completely normal. Immediately after power on, the inverter enters the inverter state. Most of the reasons for this failure are that the utility power fails to be sent to the uPS. You should first check whether the power fuse (usually 3-5A) is behind the machine. If it is normal, you should check the inverter again. AC line into the circuit, including power switches, circuit boards, connectors, varistors, sampling transformers. [Example 2] Symptoms The UPSs of the SKs-500 can't enter the regulated state after being connected to the AC, but are in the inverter state. After analysis and inspection of the inspection machine, it was found that the power fuse was replaced by a bolt (the UPs had many fuses of φ6×30mm, while the commercially available fuses were generally φ5×20mm, and many of the users were injured when the fuse was blown. Can not buy a suitable insurance tube, like to use some other metal objects instead), then check the internal circuit, found that the connection between the power switch and the circuit board plug has been black, unplug the check plug and plug the following two-sided Circuit board copper foil has been burned. Dig out the burned parts, remove the damaged plugs, solder the power switch leads directly to the corresponding solder joints of the circuit board, replace the 3A power fuse, and work normally after turning on the power supply. 2. No reaction inside the machine after power on. There is no response to access to the mains. This kind of failure phenomenon indicates that the low-voltage circuit (mainly the control circuit) in the machine cannot work. The most common reason is that the power supply of the low-voltage circuit inside the machine is abnormal, and this abnormal power supply is generally caused by the machine. Internal battery damage (or overdischarge), low voltage fuse damage (20-40A blade type fuse). For the battery, it can be judged by measuring whether there is 12V voltage across the battery (for models using two or two batteries in series, each battery should be 12V). If the voltage across the battery is low or there is no voltage, there is a problem with the battery (note that it is sometimes caused by spurious damage due to over-discharge). [Example 3] Symptoms The SANTAK UPS-500 UPs have no response after being listed on the market. They are neither stable nor reversed, just like no electricity. Analysis and Maintenance Upon inquiry, the user was informed that the UPS had been working normally but could not work because it was put in the warehouse for more than one year. It was suspected that the battery had no electricity, but plugging in the power plug for a long time did not work. Check the low-voltage fuse inside the machine is normal, the battery is only less than 5v voltage at both ends, replace it with a new battery, insert the power plug into the mains, normal immediately after boot, in the case of power (pay attention to safety) will unplug the new battery and the original The electromechanical flask was connected and charged for about 10 hours. The machine was normal and it proved that the original battery was not damaged, but was falsely damaged by natural discharge due to long-term storage. Why is it that the user does not have the effect of self-charging? This is because in the UPS circuit, the control circuit itself also consumes power, and this part of the power often needs to be provided by the internal battery. When the battery voltage inside the battery is insufficient or even without power, the control circuit will not work properly. At this time, even if normal power is connected, the control circuit in the battery cannot be switched to the state of the utility voltage, and the battery cannot be charged. , unless you first use a normal battery to "start", wait until the UPS enters the mains voltage regulator state, after the battery has entered the charging state (at this time the battery disconnect does not affect the UPS's work), and then replace the original battery in order to Electricity charge. What needs to be reminded is that the failure phenomena of UPS batteries of different models (or pseudo-damage) are not exactly the same. What happens depends entirely on the design of the circuit. In addition to the above-mentioned more common phenomena, there are also inversions. The maintenance time is too short (even if one goes to the inverter state and fails immediately). After the mains power is switched on, the internal relay emits a “click†sound, the working status is chaotic, the indicator light flashes, and the internal relays are constantly stopped. "Sound and so on, of course, there are also very few models that can automatically enter the mains voltage regulator state after the battery is turned on (I have only encountered one type of trademark "$" shaped). For the case of low-voltage fuse inside the machine is generally accompanied by a breakdown of the inverter tube short-circuit, this time should be measured through the resistance to find out the damaged inverter tube, so as not to change the fault after replacing the new fuse. [Example 4] Symptom sANTAKTwinGuard-500 Ultra-small high-frequency inverter UPS cannot be turned on. Analysis and Maintenance This is a high-frequency inverter model newly developed by Shante Company in recent years. It is very popular on the market. The UPS uses a microprocessor to control the whole machine and uses a low-voltage booting method (press and hold the power switch. More than 3 seconds to open, shut down). Check that the battery voltage inside the battery is normal, but the low-voltage fuse has blown. Further inspections of the inverters revealed that all the poles of Q09 and Q10 (IRF740) had been punctured. They were replaced with new ones, replaced with 30A low-voltage fuses, and turned on. They worked properly. 3. The mains voltage regulator is normal, but there is a strong communicative sound in the inverter. At the same time, the inverter output voltage is low (below 150V). This type of fault is typical of a single-ended inverter. The inverter of a UPS is completed by two (or two groups of) inverters in a push-pull operation. Only (or two groups) inverter tubes each assume a positive and negative half-cycle inverter task. If one of them (or one group) shows open circuit damage, then the UPS can often be reversed, but the inverter output voltage is very high. Low, and the internal transformer will emit a loud "click" sound. A common cause of this type of fault is the inverter tube or push-opening of the tube. Sometimes one of the two inverting signal output pins (10 and 10 pins) of the SG3524 has a problem (note that internal circuits or external circuits may cause this Class faults). [Example 5] Failure Symptom The FuPA500W type uPs can enter the mains voltage regulation state, but the inverter output voltage is only about 100V, and there is a sharp "click" sound in the machine at the same time. Analysis and overhaul of the machine's inverter tube using Motorola's high-power Darlington tube MJll0l6, measured after the two inverter tubes in the road between the resistance of the foot, found that there are obvious differences, further measurement under welding , Found that one of the base and emitter resistance between the forward and reverse have been very large and completely consistent, indicating that the tube has been open-circuit state of the emitter junction, the measured resistance is actually the resistance of the compound inside the protective resistor Value (the resistance is connected between the base and emitter of the tube), the bad tube is renewed, the inverter is normal after starting, and the output voltage of the inverter is measured as 250V (note that the inverter output of a normal UPS is a 50-Hz square wave voltage, When using an ordinary multimeter's AC voltage level measurement, reading high is normal and do not adjust the adjustable resistance inside the UPS. Uninterruptible power supply tips Uninterrupted Power Supply - How to extend the UPS's power supply time? There are two ways to extend the power supply time of an uninterruptible power system: 1. External large-capacity battery pack: According to the required power supply time, externally connect the battery pack with the corresponding capacity, but it should be noted that this method will cause the relative increase of the battery pack charging time, and it will also increase the floor space and maintenance costs. Carefully evaluate. 2. Buy an uninterrupted power system with a large capacity: This method not only reduces the maintenance cost, but also increases the capacity of the uninterruptible power system when it encounters the expansion of load devices. UPS power system on and off 1. First boot (1) Switching on in the following sequence: Energy storage battery switch → Automatic bypass switch → Output switch is placed in turn "ON". (2) Press UPS start panel "ON" key, UPS power supply system will start slowly, "inverter" indicator light, after a delay of 1 minute, "bypass" lights go out, UPS power supply to inverter, complete boot. After about 10 minutes of no-load operation, the load is started in the order of the load power from the largest to the smallest. 2. Daily boot Simply press the UPS panel “ON†button and after about 20 minutes, you can turn on the computer or other instrument. Normally, the load device power switch can only be turned on after the UPS starts to enter stable operation (Note: The manual maintenance switch is in the "OFF" state when the UPS is operating normally). 3. Shutdown Turn off the computer or other instruments first, and let the UPS run for 10 minutes without load. After the heat in the standby is exhausted, press the panel “OFF†key again. Editor's summary: In the process of using UPS, pay attention to good ventilation, facilitate heat dissipation, and keep the environment clean. After it is maintained and maintained, its service life will be longer and its performance will be more stable. For more information, please continue to pay attention to our website, follow-up will show more exciting content. Mobile Power Brand Power Air Switch Charging Po Mobile Power Transformer led Fluorescent Power Uninterruptible Power Supply Maintenance
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