Sub-station

Nine common malfunction analysis - UPS uninterruptible power supply

by:KEBO      2020-04-19
, UPS output when the mains is normal, and there is no mains buzzer as sirens no output failure analysis: judging from phenomenon to battery and inverter fault, according to the following program check: 1, check the battery voltage, to see if the battery charging, if the battery is not enough, is to check the battery failure or charging circuit failure itself. 2, if the battery voltage is normal, check whether the inverter driving circuit work normally, if the output driver circuit is normal, that damage of inverter. 3, if the operation of the inverter drive circuit, the circuit check waveform output PWM control signal, if there is control signal output, to show that the fault inverter drive circuit. 4, if no PWM control signal output waveform generating circuit, check whether its output because of the protection circuit and the blockade, if have, identify the cause of protection; 5, if the protection circuit has no job and working voltage is normal, no PWM waveform output circuit and waveform shows waveform generating circuit damage. The above troubleshooting sequence can also be the other way around, sometimes quicker to find fault. Second, the battery voltage is low, but the boot charging more than ten hours, the battery voltage is not filling up failure analysis: judging from phenomenon to battery or charging circuit malfunction, according to the steps below to check: 1, check whether the charging circuit input and output voltage is normal; 2, if the normal charging circuit input, the output is not normal, disconnect the battery test again, if still is not normal for charging circuit fault; If 3, disconnect the battery charging circuit input and output are normal, after the battery charged due to the long term, which have not been, discharge or has been damaged to longevity and so on reasons. Three, inverter power level of a pair of power amplifier transistor is damaged, replacement of the same model of transistor, after running for a period of time and burn out because of too much electricity, and the causes of excessive current there is 1, the over-current protection failure. When the inverter output over current occurs, over-current protection circuit doesn't work; 2, pulse width modulation ( 脉宽调制) Component failures, the output of two complementary waveform asymmetric road, a conduction time is long, and the other a conduction time is short, make the two arms work don't balance, even at the same time conduction, two arms two pipe damage; 3 and the parameters of the power tube comparatively large difference, even if the input symmetric waveform, the output will be asymmetric, the waveform output transformer, cause bias, namely the flux imbalance, accumulation down lead to surge current transformer saturation, burning power tube, and a burn out, the other one is burn out. Four, UPS after startup, there is no any display panel, UPS do not work failure analysis: judging from fault phenomenon, its failure in the mains input, storage battery and battery voltage detection circuit and mains detection parts: 1, check whether the mains input the fuse is burned; 2, if the mains input fuse in good condition, check whether the battery insurance is burned, because some UPS when self-checking less than battery voltage, will close UPS of all output and display; 3, if the battery insurance in good condition, check whether the mains detection circuit work normally, if the mains detection circuit work is not normal and UPS does not have no mains start function, UPS will also close all output and display. 4, if detection circuit work is normal, check the battery voltage detection circuit is normal. Five, in the case of connected to the mains, each open UPS, then at the sound of action relay repeatedly, UPS panel battery low voltage indicator light and buzzer long nights. According to the fault phenomena can be judged that the fault is by the battery voltage is too low, resulting in start UPS is not successful. Remove the battery, first equalizing charge ( All the battery recharged in parallel) , if you don't succeed, still only replace the battery. Six, a backup UPS have grid work, there is no mains inverter output, but the output voltage on the low side, at the same time, larger noise transformer fault analysis: inverter has a basic normal output level at the end of the drive circuit, transformer noise that push-pull circuit asymmetry of two arms work, test steps are as follows: 1, check whether the power is normal; 2, if the power is normal, check output circuit output signal pulse width is normal; 3, if the output pulse width and output circuit is normal, check the output of the driving circuit is normal. Open when the mains supply is normal, UPS, inverter working indicator light flashing, buzzer a discontinuous cries, UPS can only work in the inverter state, you cannot convert to grid work condition. Failure analysis: not to convert the inverter power supply to the mains power supply, inverter power supply to the mains power supply conversion part malfunctioned, focus on detection: 1, mains input the fuse is damaged; 2, if the mains input fuse in good condition, check the mains output rectifier filter circuit is normal; 3, if the mains output rectifier filter circuit is normal, check whether the mains detection circuit is normal; 4, if the mains detection circuit is normal, and then check whether the inverter power supply to the mains power supply switch control output is normal. Eight, the backup type UPS when the load is close to full load, mains power supply is normal, and when the battery power battery blown fuse. Failure analysis: blown fuse battery, battery power supply through the large, test steps are as follows: 1, whether inverter breakdown; 2, the battery voltage is too low; 3, if the battery voltage is too low, then test battery charging circuit is normal; 4, if the battery charging circuit is normal, then detect the battery voltage detection circuit is normal work. Nine, UPS can only from the mains power supply rather than to inverter power supply failure analysis: not to convert the mains to the inverter power supply, the grid to the inverter power supply conversion part fails, to focus on detection: 1, the battery voltage is too low, the battery fuse are in good condition; Part 2, if the battery is normal, check whether the battery voltage detection circuit is normal; 3, if the battery voltage detection circuit is normal, check the utility to inverter power supply control output is normal.
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