Fault Analysis and Maintenance
Battery voltage is low, but start charging more than 10 hours of battery charge voltage is still not up.
Failure Analysis: Phenomenon judged from the battery or charging circuit failure, according to the following steps to check:
- Check the charging circuit input and output voltage is normal;
- If the charging circuit input is normal, the output is not normal, disconnect the battery
Then measured, if not normal, compared with the charging circuit fault;
- After disconnecting the battery charging circuit if the input and output are normal, then the battery is not charged due to long-term, over-discharge or other reasons, to the life of the damage.
inverter online offline ups amplifier transistor pair is damaged, replace the same type of transistor, running for some time because they burn too much current, caused by excessive current reasons:
- Overcurrent failure. When the inverter output overcurrent, the overcurrent protection circuit does not work;
- Pulse Width Modulation (PWM) component failure, the two complementary output waveform asymmetry, a long lead-time, on-time and short the other, so that the work of unbalanced arms, even the arms are turned on simultaneously, resulting in two tube is damaged;
- Power difference between the larger tube parameters, then even if the input waveform symmetry, the output will be asymmetrical, the waveform is output transformer, causing magnetic bias, ie the flux imbalance, leading to the accumulation of down transformer saturation current surge, burn power tube, and a burn, the other also will burn.
Battery voltage is low, but start charging more than 10 hours of battery charge voltage is still not up.
Failure Analysis: Phenomenon judged from the battery or charging circuit failure, according to the following steps to check:
- Check the charging circuit input and output voltage is normal;
- If the charging circuit input is normal, the output is not normal, disconnect the battery
Then measured, if not normal, compared with the charging circuit fault;
- After disconnecting the battery charging circuit if the input and output are normal, then the battery is not charged due to long-term, over-discharge or other reasons, to the life of the damage.
inverter online offline ups amplifier transistor pair is damaged, replace the same type of transistor, running for some time because they burn too much current, caused by excessive current reasons:
- Overcurrent failure. When the inverter output overcurrent, the overcurrent protection circuit does not work;
- Pulse Width Modulation (PWM) component failure, the two complementary output waveform asymmetry, a long lead-time, on-time and short the other, so that the work of unbalanced arms, even the arms are turned on simultaneously, resulting in two tube is damaged;
- Power difference between the larger tube parameters, then even if the input waveform symmetry, the output will be asymmetrical, the waveform is output transformer, causing magnetic bias, ie the flux imbalance, leading to the accumulation of down transformer saturation current surge, burn power tube, and a burn, the other also will burn.
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