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UPS Function: (default = enabled)
When the sine wave is of good quality, the Inverter of the MultiPlus will hook up on it, thus allowing a synchronised and fast transfer when the generator stops.
Many generators have more or less ill-shaped sine waves, in particular during sudden load changes. In these situations, the MultiPlus will disconnect frequently or not connect at all. The UPS function must then be deactivated. The drawback is a slightly longer transfer time.
At UPS ON
If this is (just) before the voltage goes through the zero crossing the Multi does not real;I’ve the source is gone as its normal the voltage isn’t there at that moment, so then it takes until the first voltage top again before the unit realizes it gone. This can be up to 20-30ms. When the source is cut (just before) the voltage is at its top the reaction time can be less then 10ms
In real life it’s somewhere between these values.
At UPS OFF
its not trying to follow the sine-wave and allows to “miss “ about 20 sine-waves before reacting on it. Also when the voltage input is to low due to startup peaks it does allow it
At this setting it can be up to 1 sec before reacting , and therefore there can be a 1 sec gap
