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What is the meaning of Output Frequency (sync to mains) shown from "", Technical Specification page?

The "Output Frequency (sync to mains)" shown from "", Technical Specification page

For example, SMT3000RMI2U have Output Frequency (sync to mains)  47 - 53 Hz for 50 Hz nominal, 57 - 63 Hz for 60 Hz nominal.

means that our UPS is designed to synchronize to either 50Hz or 60Hz frequency coming from the input. If the input source frequency is at 50Hz, the UPS should be able to operate within 47Hz to 53Hz otherwise, it will switch to battery operation. This is the same with having an input frequency of 60Hz.
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