What is the load on the unit? How old is it?
The symptom can occur if the load is too large. It will also happen when the unit reaches a certain age.
I've found that the low-end consumer UPS's should be replaced when the battery fails. The charging circuitry usually fails to charge the battery even with a new battery soon after the replacement.
The way I check if the battery or the UPS charging system has failed is with a voltmeter to give the current voltage and a variable DC power supply (whatever is appropriate for the battery) to attempt to charge the battery. I can watch the battery discharge with an oscilliscope if I want a full trace of the unit.) Charge the battery fully then watch the unit over time. If the battery itself is bad, you won't get the full charge or it will discharge as soon as it is removed from the power supply.
I hope this helps.
Cindy Wells
(the server UPS's tend to be a better choice if you want to replace the battery and keep the UPS.)
193 views
Usually answered in minutes!
×