Although the UPS power supply protects the normal operation of the IT equipment due to the duir, the fault is also difficult to avoid.According to statistics, the reason for the UPS uninterruptible power supply itself causes less than 30% of the fault, natural factors and human factors, causing a fault to 50% to 70% of the total number of faults.The cause of the fault or seemingly fault can be summarized.Here, all machine phenomena of people panic and alarm Changchun Hongbao manufacturers will become "fault."
First, suspect "fault"
The so-called suspected fault, as the name suggests, refers to the misunderstanding due to lack of basic analytical capabilities and not well reading instructions. There are some small-capacity UPS power supplies below 10kVA, mostly not using liquid crystal display, but use 4 ~ 5 light-emitting diode LED vertically to "rod" indicators to represent the percentage of battery voltages or loads, this According to the percentage, it is generally less accurate without further calibration during the installation. And most users have focused on the accuracy of the indication, but some have a big mistake. For example, in an important aircraft school fly, a test station suddenly exclaimed the UPS power supply not loaded! Because he found that the load indicator was not lit. This very much alarmed the superior leaders and suppliers, and the equipment powered by the UPS power supply is throwing in normal operation when people wait for "maintenance". A false reason is that the duty person finds that the load indicator is not bright. The random manual is clearly written, when the load is more than 30%, the lowermost indicator is lit.
In another example, a UPS power supply dual-machine redundancy is often running normally, the duty person suddenly discovers that there is two lamps on the control board of one UPS power supply, and there is only one point on the control board. Light, the difference between these two causing panic, so he urgently recruited Changchun Hongbao manufacturer repair. It turned out that the two-machine and llued, the host lit the two lamps and the secondary machine only lit a lamp, and it has been described in the product manual.
Second, the knowledge "fault"
The knowledge fault is mainly due to some machine administrators who have been self-employed and actually causes both the lack of basic theory but lack of practical experience. For example, there is a pair of 30kvaups power redundant parallel systems, and there is a communication machine. The communication machine is just a brief and smoked, and it has changed three, and it has changed three, which is normal. So the communication machine Changchun Hongbao manufacturer proposes that this fault is due to the zero drift of the UPS power three-phase output voltage caused this phase voltage too much, and the UPS power manufacturer immediately solves the problem. After the field measurement, the three-phase voltage of the UPS power supply is 220V, and the three currents are less than 10%. What is the zero drift? It is actually identified that the power supply of the communication machine manufacturer has quality problems.
In the conventional double transform UPS uninterruptible power supply in the early morning, since the three-phase reversal uses a unified control, zero drift is generated in the case of three-phase load extreme imbalance, so that the three phase voltages are very different. Later, after the three-phase phase voltage, the three-phase voltage, the method of unified control, and the case is greatly improved, and the imbalance of the three phase voltages can be 2%. The recent three-phase halfbrush inverter uses separately, and the three-phase voltage is completely independent under the control of the unified phase, and the three-phase voltages can be made without the three-phase load 100% imbalance. The balance is less than 1%, which provides a selection of space for the "non-three-in-one UPS power supply".
Third, the operation fault
1 In order to turn the UPS power is safe and reliable, various products have a set of operational procedures for their own "specific". The so-called "specific" is to say that the design ideas of various brands of UPS power supplies are different. They also have their own considerations and write it into a random "Operation Manual". According to the "Manual" program, you can fully guarantee the security, otherwise it may or will inevitably. However, some operators think that the power supply is very simple, and does not read the instructions, according to their own understanding, the results have caused losses.
2 unconscious operation. For example, during repair, when the device disassembled a firm device, accidentally changing the nearweeping device and did not discover, after the repair is completed, it has caused secondary fault.
3 When the charge checks the fault, measure the cavity of the caching probe to simultaneously touch the circuit or device to form a repetitive fault.
4 When connecting external batteries, it is mistaken to get the polarity, burned the inverter; some battery links have been tightened or the battery switch has been tightened or the battery switch is forgotten. When the electricity is connected, the UPS power supply cannot discharge due to battery Stop.
5 The input / output line link is not strong, which will make an AC power failure failure; the power supply bureau performs line maintenance or change the original phase prior, resulting in the UPS power supply; UPS power is powered, forget to start The inverter has always been bypass power supply, and the UPS power supply also stops power when there is a fault.
6 duty officers put food in the duty room near the machine room UPS or computer room UPS, and find the mouse bite the cable or drill into the machine to cause the fault.
7 unreasonable wiring. For example, there is a shielded remote signal line with the AC power line close to the trace. The partially controls the signal disorder, causing a fault.
Fourth, delay failure
1 The machine has been alarm, due to the negligence of the duty, there is no timely discovery, resulting in a later failure. In other words, if it is found in time, it can avoid subsequent failures. For example, in the uninterruptible power supply system in parallel in the aircraft dual-machine, the load is split to the two machines, and some UPS powerways sometimes cause an inverter shutdown due to the coincidence of a certain condition. The system is automatically The load of the failed UPS power supply is turned on another, which is a panel or monitor that will show alarms. The duty duty time or the market is longer, and the other UPS power will turn to the next or the electric power is turned off.
2 The battery is running in a non-ideal case, especially in the case of long-term no charge and discharge, it is necessary to strengthen monitoring. Once the discovery capacity is significantly reduced, it is immediately replaced. Because the speed of the battery is slow, some is instant, today’s measurement is good, it is likely to be completely broken tomorrow.
3 The fuse and connector of the car or carrier UPS power supply are easy to loosen in the constant seismic, thereby causing faults. The fuse runs for a long time in power-on, which will heat the softening process while being shaken, if it is not replaced in time, it may break, causing a fault.
V. Improper maintenance or failure caused in time
1 Regular maintenance of uninterruptible power supply UPS is necessary, and there should be a strict management program. Regular or irregular maintenance is not based on the requirements of regulations, which leads to an important reason for the fault of machine. For example, the UPS power supply causes the machine to operate unstable, stop, and cannot start and burn the components. On behalf of the casing, it was found that the dust of the conductive ion was filled with the whole machine, covering the circuit board, filled with an insulated air gap, mixing moist air destroying the normal operation of the circuit. These foreign matter cleaned these foreign matter with a hairdryer can be normal.
2UPS power supply is maintained, the engineer puts the mains input switch, and it is exactly to start the inverter. Once the market is powered out, the inverter does not work, causing the battery to discharge, resulting in the output of the UPS power supply simultaneously.
3 The battery running period has arrived, some batteries have failed, and they should be replaced according to the regulations, and the user will reserve the battery that will be used "in order to save, only the batteries that will never continue to use. The role of the new battery will not only get full, but it causes the machine to make a failure.
Six, experience fault
Experience failures is indispensable, it is not much wealth. But experience has its relative, that is, the experience gained on a UPS power is not necessarily suitable for the other, otherwise the fault will be caused.
1 As a person with a person with clicking operation experience, the UPS power supply is launched, and then the inverter is started after the inverter is activated, and the inverter is burned down. He didn’t know that it was first closed the output switch when it was on the centralized machine and then launched the inverter.
2 Some maintenance personnel have a few times when repairing a UPS power supply, and it is normal after replacement. It is precisely a serious continuous failure in a replacement. In fact, there are many reasons why the fuse is blown, and the quality of the fuse itself will be damaged in advance. The fever fuse will break, enter the rectifier and filter capacitance in the non-seismic, and the inverter is two power tubes. Tong and several strings can cause the input fuse to blow.
3 Some people are particularly familiar with a brand uninterruptible power supply UPS. When the UPS power cannot be started, it can use the Crane to smash the DC relay. When the same method is used in the same brand UPS power supply, the inverter is burned.
Seven, handover faults
The handover fault is mainly caused by the absence of the management personnel.
1 The actual management machine and untrusted personnel and personnel training from the manufacturer are not the same person.
2 The front value machine personnel do not explain the work of the machine. For example, when the front value machine moves the machine position, the outer battery assembly of the UPS power supply is disconnected, and when it is not explained to the later person, the result has caused the market and UPS failure.
Eight, environmental failure
The environmental failure is caused by the user who does not pay attention to the operating environment of the machine or has no capacity optimization environment.
1 Some users put the UPS power supply in an environment where both air conditioner and aerial, the summer temperature is up to 40 ° C, and the tide is wet, causing the battery to fail in advance.
2 Some local power conditions are very poor, not only the voltage fluctuations are large and often power outage. Working in this environment UPS power battery is often discharged, and the user does not raise a fast charge request to the supplier, so that the battery is in a loss of loss, and it will also cause early failure of the battery.
3 In places where the lightning or industrial interference is serious, the user does not configure a certain level of lightning protection or surge controller in the input distribution plate, causing the UPS power to be damaged.
Nine, selection failure
The styling fault is mainly caused by some confused concepts of the point. For example, the efficiency of the UPS power is used as the power factor, and the input power factor is used as a load power factor and the power is active as an active power. It is considered that the UPS uninterruptible power supply load power factor is, the better, and does not know the computer. The load is not only required to have powerful power, but also need reactive power, but not only. As a result, the UPS power capacity purchased is not too big, it is too small, and the selected UPS power supply will trip due to frequent overload.
Ten, business failure
Business failure is mainly due to excessive demanding suppliers in prices and other conditions.
1ups are uninterruptible, like other machines, it looks like a shell, the same internal circuit link, etc., but the material and components of the outer casing have a natural aid, so it is far from the difference. Both are not symservative in some functions and reliability. Some users don’t understand these differences, and the machines that require different grades of machines have the same price. The supplier has to reduce the quality of the components for business, and the result is reduced, and the failure rate is increased. Even the UPS power cripple is too embarrassed, and the capacity contract is a 100kVA machine that is 100KVA, the reason is that a manufacturer uses the same casing for both.
2 Some users requiring suppliers to resolve the battery for 3 to 5 years to do 3 years of free guarantees, this is a less suitable requirement, because in a sense, it is equivalent to unclear user Lifetime free guarantees in the case of the environment. For business, the supplier will certainly be able to perform the contract in the future. However, due to the continuous failure, the battery is constantly replacing, so that the UPS power is turned frequently, resulting in losses to the user.
Changchun Hongbao is an export-oriented enterprise specializing in research, development, production, sales and technical services in power field products.
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