Frequently Asked Question
Last Updated 4 years agoAn online UPS is designed to work in a double conversion technology. This means output frequency and voltage are isolated from input and generated by internal electronics from DC voltage. Nevertheless, you might notice that frequency (not the voltage) is changing within a small range. This effect is caused by intentional synchronizing of the output voltage to the input voltage.
As a benefit, whenever you switch between bypass and line mode, the synchronized will minimize transfer effect.
As a drawback, the frequency is not fully stable, but follows the input frequency, which not always is a desired outcome. In normal circumstances small changes within a narrow limit are causing no negative effect to the load.
If you want to disable synchronization of the frequency, please turn on the Converter Mode (CVCF). For more details, please check the corresponding manual.