3. Correct operation
Due to the significant impact current of the load at the moment of startup, and the safe working area of the internal power components in UPS. If the starting surge current is large, the UPS will provide overcurrent protection and switch from inverter output to bypass output, which can seriously damage or even cause damage to power components. UPS is powered by mains electricity during bypass operation, and its capacity can be considered infinite with strong impact resistance. Therefore, this feature can be utilized to perform the following startup steps when starting up the UPS:
(1) First, turn on the static bypass input switch of the UPS to put it in the mains bypass power supply state.
(2) Turn on the loads one by one, starting with the load with the smaller impulse current, and then turning on the load with the larger impulse current.
(3) Turn on the rectifier input, then close the battery switch, and start the inverter to automatically switch the load from static bypass power supply to inverter power supply state.
Due to the large number of inductive energy storage components inside UPS, when the load suddenly shuts down, a momentary high voltage will be generated at both ends of the inductive components based on the magnitude of the current change rate; Especially under full load conditions, when the load suddenly shuts off, the instantaneous voltage generated will be higher. If the internal components of UPS are frequently subjected to high voltage shocks, their performance will decrease and there is a risk of breakdown. To minimize the impact of high voltage on components, the following shutdown steps can be taken:
(1) First, turn off the loads one by one
(2) Turn off the inverter to switch the UPS from inverter state to bypass state.
(3) Turn off the rectifier input switch, then turn off the static bypass input switch, then turn off the UPS output switch, and finally disconnect the input mains circuit breaker. Therefore, when using the Santak UPS power supply, it should work continuously and not frequently switch on/off, let alone switch on/off with load. 20% of failures in large and medium-sized UPS systems are caused during on/off operations.