Shing Shing Battery Battery 12V100AH ??parameters Symptom 2: mains work with the normal working hours of a serious shortage of reserve load. Detection and Analysis: From Symptom analysis, fault may be: 1. The battery voltage is too low, not enough. 2. Inverter control circuit is faulty. 3. Battery partially damaged. The charger circuit is faulty. 5. Output patch damp dust intrusion caused by leakage phenomenon. First check: 1. output connectors make clear, remove possible leakage. 2. UPS for a long time after charging, boot failure still exists. 3. Use a multimeter to check the battery voltage of 48V is normal. 4. Check the charging circuit, normal. 5. Check the inverter control circuit is normal. 6. The electrical performance multimeter and an ammeter connected in the following figure to check the battery and found that the battery pack electrical performance degradation, specifically caused by the battery internal resistance increases. 50 without resistance when the battery voltage is measured at 48V. After the resistor, the current is 800mA, the voltage across the resistor is 40V. Test data indicate that the battery internal resistance increases, the voltage drop across the internal resistance of the 8V power consumption is 6.4W, such as battery-powered resistance increases linked to the same time of 30 minutes, proof battery performance. Results: replace the battery, boot normally, can achieve long-UPS backup time. Battery cost is high, accounting for more than 30% UPS total cost. Therefore, in order to save money, part of the performance can decrease battery charging machine force, charging successful, can still be used. This failure is sometimes caused by damage to the cooling fan control circuit of the inverter, please note that when you introduce users to maintain UPS uninterruptible power supply UPS power failure which troubleshooting methods 1, when there is electricity UPS output is normal, no electricity when bee buzzer sounding, no output. Failure Analysis: judge from the phenomenon of the battery and the inverter part of the fault, according to the following procedure to check: Check the battery voltage, battery NP105-12 see whether champion charging less, if the battery charging less, will have to check the battery's own fault or charging circuit failure. If the battery working voltage is normal, check the inverter drive circuit is working properly, if the driver circuit output is normal, indicating that the inverter is damaged. If the inverter drive circuit is not working properly, check the PWM control signal output waveform generator circuit or without, if the control signal output, indicating a fault in the inverter drive circuit. If the waveform generator circuit without PWM control signal output, check its output is a result of the protection circuit and the blockade, if it is to identify the cause of protection; if the protection circuit did not work and the working voltage is normal, and no PWM waveform output waveform generation circuit is illustrated waveform generator circuit damage. Therefore, the discharge order can be reversed were sometimes able to quickly find faults. Our network traffic jam never forge ahead in unity, innovation, hard work and progressive reputation-based service is the root, supports and encourages young talent, dedication wing group love party patriotic, law-abiding, pragmatic and pioneering spirit of honesty and trustworthiness, flexibility, perseverance, courage innovation and enthusiasm, changing concepts, enhance knowledge, to meet the challenges of our management philosophy: humane, systematic, scientific, international and our business philosophy: to advanced technology and services to customers - creating value, creating a win-win our service concept : to all of our customers to grow as a fundamental style: passion, unity, integrity, win-win, dedication, responsibility to our market outlook: the customer's suggestions and comments as the subject of study and research