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Function of the external transformer is to step up/down voltage, or derive a neutral source, or create a solid ground source for the ups. Not ideal to place motor load on ups as it will overload it during startup due to high in rush
Isolation of the inverter or electronic system in the inverter against inrush currents arising from industrial loads. Basically, it is for safety purposes of the UPS systems.
When normal power is lost, but normal power is fed thru ATS and you get normal power back within a couple of cycles; what are the sequence of the UPS? my understanding is to batterie power and back to normal after normal is restore to UPS
Ricardo. When you have an ATS feeding the normal power (rectifier/charger) to the UPS, when normal power is lost a standby generator will start. This generator usually takes around 30 seconds to 1 minute to start and get up to speed. After it is up to speed, the ATS will transfer power supplied to the rectifier/charger to the generator. During the 30 seconds to 1minute, there will be no power into the rectifier/charger. Therefore the battery will supply the inverter while the generator is starting. Once the generator is on and the ATS transfers, power will be returned to the charger/rectifier section of the UPS and the batteries will start to charge again. It should be noted that the ATS does not have anything to do with the load circuits. Only the input power to the rectifier charger section of the UPS.
