EL
BG
DE
ES
FR
ITFrequently Asked Questions · UPS
Can a system shut down or restart while connected to a UPS?
There are two scenarios: 1) UPS overload → degraded operation; avoid it by choosing the right specifications and watching the indicators. 2) Battery discharge → reduced runtime. Charge for 8-9 hours before first use, then for 4-6 hours, and recharge immediately after a full discharge.
Yes, it can, and the cause is usually one of the two mentioned. When the total load exceeds the rated power, the UPS protects itself: either it switches to bypass, so the load is fed directly from the mains without protection, or, when running on battery, it cuts the output. A typical example is a laser printer or a heater on the same outlets as the computer, causing a momentary current peak.
The second scenario is that the batteries do not deliver the expected runtime, because they are not fully charged or because they have aged. Then, during a power cut, the unit shuts down much sooner than you expect.
To avoid this:
- Connect only critical devices to the battery-backed outlets and ideally keep the load below about 70–80% of the rated power.
- Check the load and battery status indicators periodically.
- Install the management software so that the computer or server shuts down gracefully before the battery runs out.
A common mistake is blaming a UPS fault for a shutdown that is really caused by overload or aged batteries.
