title: A sustained event 27 Minute paralysis, Unveiled it "Dynamic holding UPS" True value 2019 year 7 moon, A cross-border e-commerce warehouse center in Shenzhen suffered a disaster during the evening rush hour. The transformer in the park tripped due to lightning strike, The backup diesel generator stalled due to impurities in the oil circuit during the third second of startup. Two power sources fail simultaneously, The entire three story three-dimensional warehouse WMS system, automatic sorting line, RF Handheld terminals all black screen. Guess what the result is? 27 The mains power will be restored in minutes, But the warehouse has fallen into chaos: 3000 Multiple scanned packages cannot confirm their destination, Cross border flights forced to reschedule, Customer complaint hotline breakthrough within one hour 200 through. Post event inventory, Direct economic losses 47 ten thousand yuan, The implicit loss of customer trust is difficult to estimate. Why are there also sudden power outages, Some factories can seamlessly switch production, But some other companies are paralyzed? The answer is hidden in UPS of "Dynamic holding ability" inside. so-called "Dynamic holding" , refers to UPS Faced with sudden load changes, Harmonics in the power grid, Dynamic retention capability of urban radio waves during operation. ordinary UPS Switching battery power supply after the drop in mains electricity, Technical indicators remain stagnant "uninterrupted power supply" This bottom line. But the real industrial scene is far more complex than this - When the automatic sorting line of the warehouse starts from static to full speed, Instantaneous current may soar up to six times the rated value; When the cold storage compressor frequently starts and stops, The power factor will be 0. 3 to 0. 9 Vigorously swinging between them. A machine lacking the ability to move and hold UPS, Will repeatedly enter bypass protection mode in this scenario, Equivalent to exposing the load to the instability of the power grid. Looking back at the warehouse center in Shenzhen. They are purchasing entry-level products from a certain brand UPS, label "8000VA/6400W" , The various indicators on the parameter table are so beautiful that no one can find any flaws. But the problem lies in a technical detail: This model is designed for offices IT load, The response speed of its rectifier topology to impulsive loads is only 200 millisecond. And the automatic sorting line motor in the warehouse starts with a current surge, The response window only has 30 millisecond. that 27 Minute paralysis, essentially UPS Prior to diesel engines "fall down" 了. I have seen a completely opposite case. A precision instrument manufacturer in Guangzhou, Industrial grade dynamic support is configured in the workshop UPS. They conducted an extreme test once: Simultaneously activate three units 22kW The servo motor, Simultaneously allowing the welding robot to perform high current arc welding. UPS The distortion rate of the output voltage waveform is always controlled at 3%below, When the load suddenly changes, the voltage drop does not exceed the nominal value 5%. frankly speaking, What industrial users really need is not "uninterrupted power supply" , but rather "Not stopping" . Power outage can be restored, But the semi-finished products currently circulating on the production line, Writing order logs to the database, The temperature and humidity environment being adjusted, Once interrupted, The loss is exponentially amplified. The enlightenment brought to us by these two cases is actually very direct. first, UPS Selection cannot be solely based on criteria VA Number and backup time, The load characteristics are the true screening criteria. Power type load, Rectification type load, Impact type load, The requirements for each type of dynamic holding ability vary greatly. second, The dynamic holding capability involves the dynamic response bandwidth of the rectifier, Control algorithm for inverter, Energy storage margin of filtering capacitor, These parameters are not included in the regular product manual, But it precisely determines the critical moment UPS is "comrade-in-arms" still "undercover" . third, Enterprises often make a mistake in the procurement process: turn UPS Compare prices as standard products, Neglecting the adaptation to working conditions. different industries, In different scenarios, Dynamic holding UPS The technical focus is completely different. so, Next time, when the supplier submits a beautifully crafted set of parameters UPS When planning, Why don't you ask one more question: your UPS During sudden load changes 30%time, What is the recovery time for output voltage? When the harmonic content exceeds 15%Under the power grid, Can it still maintain its design lifespan? These questions are not clear, What you may have bought is just one "Quiet backup power supply" , But not one "Reliable production guarantee" .