What are the repair methods for UPS uninterruptible power supply
UPS uninterruptible power supply repair, method 1: First, check the voltage of the battery inside the machine, it is normal, there are no significantly damaged components on the circuit board, and there are no abnormalities in the four MJ4502 inverters. After starting up, measure the VCC power supply of each integrated circuit, which is also normal, but there is no sign of inversion. Therefore, it is suspected that a JCT is damaged. Due to the difficulty in finding maintenance drawings and data for the machine, it was difficult to identify faults using road measurement and identification methods. Therefore, the replacement method was used to search for faults.
The first replacement was the control core Icl (sG3524) of the inverter circuit, which was directly tested with the KA3524 manufactured by Samsung. After starting up, the inverter immediately returned to normal, proving that the fault of the machine was caused by damage to the SG3524. After replacing Icl, troubleshoot the issue.
UPS uninterruptible power supply repair, method 2: After starting up, there is no chemical reaction inside the machine, and there is no chemical reaction when connected to the mains power. This fault phenomenon indicates that the low-voltage circuit (mainly the control circuit) inside the machine cannot work. The most common reason is that the power supply of the low-voltage circuit inside the machine is abnormal, and this abnormal power supply is usually caused by damage to the internal battery (or over discharge) or damage to the low-voltage fuse (20-40A plug-in fuse).
UPS uninterruptible power supply repair, method 3: If there is information indicating that the inverter is not working or the inverter indicator light is flashing, then we need to delve into the circuit to thoroughly inspect the inverter output and inverter output switching circuit. This depends on the experience and practical skills accumulated in repair work. In actual damaged components, charge measurement is the most effective and easier way to identify the fault point.
UPS uninterruptible power supply repair, method 4: Check that the low-voltage fuse inside the machine is normal, and there is only a serious voltage of less than 5V on both sides of the battery. Replace it with a new battery, insert the power plug into the mains, and immediately start it up. In the case of charge (pay attention to safety), unplug the new battery and connect the original battery. After about 10 hours, everything is normal on the machine, which proves that the original battery is not damaged, but a false damage caused by long-term neglect and natural discharge.
UPS uninterruptible power supply repair, method 5. For the quality of the battery, it can be distinguished by measuring whether there is 12V voltage on both sides of the battery (for models that use two or three sets of batteries connected in series for power supply, each battery should be 12V). If the voltage at both ends of the battery is extremely low or there is no voltage, it indicates that there is a problem with the battery (note that sometimes false damage is caused by overdischarging).
