What is UPS? UPS power supply common fault analysis and maintenance skills introduction

　　Author ：Iflowpower – Portable Power Station Supplier

The UPS power supply is a power supply device containing the energy storage device, inverter, constant components, is one of the indispensable peripheral devices that cannot be powered off by communication devices, computer systems, etc., it In the case where the external interrupt is powered, it is timely supply to the computer and other devices, so as not to affect the interruption of communication, the loss of important data and the damage of hardware. However, while using the UPS power supply as the protection of other objects, there will be some faults, if the UPS power is faulty, it cannot be supplied to the load supply.

UPS Power Common Fault Analysis and Maintenance Skills Through the analysis processing of UPS power frequently fault phenomena: Question 1: UPS power output is normal when there is time, without market, buzzer long, no output. Fault Analysis: From the phenomenon, it is determined that the battery and the inverter partial fault can be checked: 1. Check the battery voltage.

If the battery is not charged, if the battery is insufficient, it is necessary to check whether the battery itself is faulty or charging circuit failure. 2. If the battery operating voltage is normal, check whether the inverter drive circuit work is normal, if the drive circuit outputs normally, the inverter is damaged.

3, if the inverter drive circuit is not working properly, check the waveform in which the waveform has a PWM control signal output. If there is a control signal output, the fault is in the inverter drive circuit. 4, if the waveform does not have a PWM control signal output, check whether its output is blocked due to the protection circuit, if there is a protection cause; 5, if the protection circuit does not work, the operating voltage is normal, and the waveform has no PWM The waveform output indicates that the waveform has circuit damage to the above-mentioned order, and it can be downgraped, sometimes it can be discovered faster.

Question 2: Inverter power level pair of power amplifier transistors, after replacing the same type of transistor, the reason for running for a period of time and burning is too large, and the cause of excessive current is: 1, overcurrent protection invalid. When the inverter outputs an overcurrent, the overcurrent protection circuit is not used; 2, pulse width modulation (PWM) component fault, output two complementary waveforms asymmetrical, one turn-on time, and another turn-on time Short, make the two arms work unbalanced, even the arms are turned on, causing two tubes damage; Gas magnetic, magnetic flux is unbalanced, accumulating to cause the transformer to saturate, the current increases, burns bad power tube, and one burning bad, the other also burns bad. Question 3: The battery voltage is low, but the battery voltage is still can't be charged for more than ten hours.

Fault analysis: Judging from the phenomenon as a battery or charging circuit fault, you can check: 1, check whether the input and output voltage of the charging circuit is normal; It is not normal to charge the charging circuit;. Question 4: After the UPS power is turned on, there is no display on the panel, the UPS power is not working. Fault Analysis: Judgment from the fault phenomenon, its fault is in the mains input, battery and market electrical testing part and battery voltage detection loop: 1.

Check if the city's electric input fuse is burned; Burning, because some UPS will close all the output and display of the UPS when the battery is not in the battery voltage; UPS does not have a market-free function, the UPS will also turn off all outputs and display. 4. If the city test circuit is working properly, check whether the battery voltage detection circuit is normal.

Problem 5: Turn on the UPS power supply when the power supply is normal, the inverter work indicator flashes, the buzzer makes an intermittent call, and the UPS power can only work in the inverter, and cannot be converted to the mainstay of the city. Fault Analysis: The inverter power supply is not possible to supply power supply to the city, indicating that the inverter power supply has failed to the market power supply conversion section, and it is necessary to test: 1. Whether the main input fuse is damaged; Check that the output of the market is normal; Is it normal?.

Question Six: A backup UPS is working properly, no market is output, but the output voltage is low, and the transformer has a large noise. Fault Analysis: Inverter Output Description The end-level driving circuit is basically normal, and the transformer has noise indicates whether the two arm of the push-pull circuit is asymmetrical. The detection steps are as follows: 1.

Check the power is normal; 2, if the power is normal, then check the pulse Wide output circuit output signal is normal; 3, if the pulse wide output circuit outputs normal, check whether the output of the drive circuit is normal. Question Seventh: In the case of accessing the mains, each time the UPS power is turned on, he heard the repeated action sound of the relay, the UPS power panel battery voltage is too low indicator light and the buzzer is long. According to the above fault phenomenon, it can be judged that the fault is that the battery voltage is too low, resulting in unsuccessful UPS startup.

Remove the battery, advance, balance charging (all batteries are connected in parallel), if it is still unsuccessful, only replaceable batteries. Question 8: The UPS power supply can only be powered by the main electricity and cannot be converted into inverter power supply. Fault Analysis: The market is not possible to supply power conversion, indicating that the city's electrical inverter power supply conversion section has failed, and it is necessary to test: 1, whether the battery voltage is too low, whether the battery fuse is intact; 2.

If the battery is normal, check Whether the battery voltage detecting circuit is normal; if the battery voltage detecting circuit is normal, then check whether the market-oriented inverter power conversion control output is normal. Question Nine: Backup UPS Power When the load is close to full load, the main electricity supply is normal, and the battery fuse is blown when the battery is powered. Fault Analysis: Battery fuse blows, indicating that the battery supply current is too large, the detection steps are as follows: 1, whether the inverter breaks through; 2, if the battery voltage is too low; 3.

If the battery voltage is too low, it will detect whether the battery charging circuit is normal. 4. If the battery charging circuit is normal, the operation of the battery voltage detection circuit is normal.