UPS uninterruptible power supply FAQ and exclusion method1. When there is a city time, the UPS output is normal, and the buzzer is long, no output.
Fault Analysis: From the phenomenon, it is determined that the battery and the inverter partial fault can be checked by:
- Check the battery voltage and see if the battery is charged. If the battery is charged, it is checked whether the battery itself is or the charging circuit fault.
- If the battery operating voltage is normal, check whether the inverter drive circuit work is normal, if the drive circuit is output, the inverter is damaged.
- If the inverter drive circuit is not working properly, check that the waveform generating circuit has a PWM control signal output. If there is a control signal output, the fault is in the inverter drive circuit.
- If the waveform generating circuit does not have a PWM control signal output, check whether its output is blocked due to the protection circuit, and if there is, it identifies the protection causes;
- If the protection circuit does not work, the operating voltage is normal, and the waveform generating circuit has no PWM waveform output, the waveform generating circuit is corrupted.
The order of the above tributics can also be dowed, sometimes it can be discovered faster.
2, the battery voltage is low, but the boot charging is more than 10 hours, the battery voltage is still not filled.
Fault Analysis: Judging from the phenomenon as a battery or charging circuit fault, you can check:
- Check whether the input and output voltage of the charging circuit is normal;
- If the charging circuit is input is normal, the output is not normal, disconnect the battery and then measure, if it is still not normal, it is a charging circuit fault;
- If the charging circuit input is turned off, the output is normal, and the output is not damaged by the cause of long-term uncharged, overplay, or has arrived in life.
3. Inverter power level pair of power amplifier transistors, after replacing the same model transistor, the reason for running for a period of time is too large, and the cause of excessive current is:
- Exposer overcurrent protection. When the inverter outputs an overcurrent, the overcurrent protection circuit does not work;
- Pulse width modulation (PWM) component fault, output two complementary waveforms are asymmetrical, one turn-on time is long, and the other turning time is short, so that the two arms work unbalanced, even the two arms are simultaneously turned on, resulting in two Damage damage;
- The power tube parameter is large, even if the symmetrical waveform is input, the output will also be asymmetrical, the waveform is output transformer, which causes a bias, which is unbalanced, and the accumulation causes the transformer to be saturated, and the current increases. Power tube, and a burning, the other is also burning.
4, after the UPS is turned on, there is no display on the panel, and the UPS does not work.
Fault Analysis: Judging from the fault phenomenon, its fault is in the mains input, battery and market electrical testing part and battery voltage detection loop:
- Check if the city's electric input fuse is burned;
- If the main input fuse is intact, check whether the battery insurance is burned, because some UPS will close all the output and display of the UPS when the battery is not in the battery voltage;
- If the battery insurance is in good condition, check whether the operation of the city's electricity detection circuit is normal. If the market is not working properly and the UPS does not have a market-free function, the UPS will also turn off all output and display.
- If the city test circuit is working properly, check whether the battery voltage detecting circuit is normal.
5. In the case of accessing the mains, each time the UPS is opened, he heard the repeated action sound of the relay, the UPS panel battery voltage is too low, and the buzzer is long.
According to the above fault phenomenon, it can be judged that the fault is too low by the battery voltage, resulting in unsuccessful UPS startup. Remove the battery, advance to the balance charging (all batteries are connected in parallel), if it is still unsuccessful, only the battery is replaced.
6, 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 has output, the final type driving circuit is basically normal, and the transformer has noise indicates that the two arm of the push-pull circuit is asymmetric, the testing steps are as follows:
- Check whether the power is normal;
- If the power is normal, check if the pulse wide output circuit output signal is normal;
- If the pulse width output circuit outputs normally, check whether the output of the drive circuit is normal.
7. Turn on the UPS when the power supply is normal, the inverter works indicator flashes, the buzzer makes an intermittent call, and the UPS can only work in the inverter, and cannot be converted to the mainstay of the mains.
Fault Analysis: The inverter power supply is not possible to supply power supply to the market, indicating that the inverter power supply has failed to the market power supply conversion section, and it is necessary to focus on:
- Marine input fuse is damaged;
- If the market is in good condition, check whether the output of the city electricity stream filter circuit is normal;
- If the city electric rectification filter circuit outputs is normal, check whether the city's electrical detection circuit is normal;
- If the mains detecting circuit is normally, check whether the inverter power supply is normal to the market power supply conversion control output.
8. When the load is close to the full load, the electric power supply is normal, while the battery fuse is fed when the battery is powered.
Fault Analysis: The battery fuse is blown, indicating that the battery supply current is too large, and the test steps are as follows:
- Does the inverter breakdown;
- Whether the battery voltage is too low;
- If the battery voltage is too low, it will detect whether the battery charging circuit is normal;
- If the battery charging circuit is normally, it is detected whether the battery voltage detecting circuit is working properly.
9. UPS can only be powered by the main electricity and cannot be turned to inverter.
Fault Analysis: The market is not possible to supply power conversion, indicating that the market is faulty, and it is necessary to focus on test:
- Whether the battery voltage is too low, whether the battery fuse is intact;
- If the battery part is normal, check whether the battery voltage detecting circuit is normal;
If the battery voltage detecting circuit is normal, then check whether the output of the market is normal inverter. Recommend: LiFePO4 Battery Manufacturer Energy storage battery Manufacturer Integrated machine energy storage battery series Manufacturer Lead lithium battery Manufacturer Outdoor Backup Battery Manufacturer Portable outdoor power supply Manufacturer Power battery Manufacturer Powerwall LiFePO4 Battery Manufacturer Battery rack Manufacturers Telecom LiFePO4 Battery Manufacturer Wall mounted battery storage Manufacturer China Lifepo4 Battery
