8.Secondary faults caused by improper maintenance
Regular maintenance of UPS is necessary, but there should be a strict management procedure in place. Those who are irresponsible and do not follow the prescribed requirements for regular or irregular maintenance are important causes of machine malfunctions. In addition, maintenance can also cause malfunctions, such as when using a multimeter probe to measure the potential of a circuit board, the probe short circuits two points, leading to malfunctions. When a user is discharging a battery, they remove the battery from the UPS and then reconnect it to release the device, resulting in an explosion of current. For example, when an engineer was replacing a centrifugal fan, he accidentally slipped his wrench and hit the control board. He didn’t pay attention at the time, and after replacing the fan, it couldn’t be turned on. Upon inspection, it was found that one of the component legs was broken……
9 Malfunctions caused by static electricity
A certain computer room was shut down for maintenance as usual, but after maintenance, it could not be turned on. After inspection, it was found that a component had voltage breakdown. Recalling the maintenance process, it was discovered that the control board had been cleaned of dust with a plastic toothbrush. Plastic can generate thousands of volts of frictional electrostatic voltage on the surface of drying devices. Due to the use of MOS devices in the small signal circuit of the machine, these devices have low voltage resistance and are most afraid of static electricity. After measurement, a regular plastic bag can generate an electrostatic voltage of 3000V by rubbing it with a circuit board. So it’s best to wear a grounding ring around your wrist when inspecting these circuit boards.
10 Malfunctions Caused by Overconfidence
Confidence in doing things is the foundation of success, but overconfidence can sometimes lead to mistakes. For example, an international bank should update its equipment after 8 years of UPS operation, and the manufacturer has repeatedly reminded it. Due to the rarity of problems with the UPS in the past 8 years, the user manager repeatedly answered ‘no need to update’. As a result, several months later, the UPS stopped supplying power for two hours due to aging faults, causing a two-hour interruption in global business and significant losses.
According to international statistical data, the maximum nominal battery service life of 5 years should not exceed 3 years. Normally, it should be replaced after 2 years without regular maintenance. The battery in the waiting hall of a certain airport was originally equipped with 4 hours, but it was not replaced after 3 years. During an external power outage, the UPS backup time was only 4 hours, resulting in losses due to the power outage……