This FAQ has been written for NEAL (North East Africa and Levant) region. If you are looking for information for another region, please select the correct country from the top-left dropdown in the page and 'Navigate to Browse FAQs' in the Support menu.
Issue:
Why do I measure voltage on the outputs of my UPS even though the output is turned off?
Why do I measure voltage on the input when the UPS is on battery?
Product Line:
Smart-UPS
Environment:
All models, All Serial Numbers
Cause:
Phantom voltage can sometimes be detected with a voltmeter on the output of the UPS even though the UPS output is switched off.
This voltage is not actually present, and If a resistive load (such as an incandescent lightbulb) were to be applied, the voltage will immediately collapse.
This behavior is normal and to be expected.
This same phenomenon can be seen on the input of a UPS when it is on battery. This would also collapse if any load were to be applied. All Smart-UPS incorporate backfeed protection and meet UL specifications for such.
Resolution:
This is normal operation and will not affect any equipment connected to the UPS.
Released for:Schneider Electric Egypt and North East Africa
