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The UPS goes on battery when the input voltage is not in range or cannot be corrected by the AVR of the SMX unit I suggest check your input voltage if the voltage is different from the set output of the UPS reduce sensitivity the SMX units is normally on the highest sensitivity by default
You can also change the High and low transfer point when using the advance menu type
User Guide See page 8-12 of the user guide
Also refer to this article
Video: What are the different sensitivity settings of a Smart-UPS?
https://www.apc.com/us/en/faqs/FA156514/
If the voltage is normal and you already have the lowest sensitivity and other UPS are working normally on the same circuit the UPS may have faulty sensors and may need to be replaced
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