Liebert Recent Questions, Troubleshooting Help & Support

How does it react when you simulate a power lose? Unplugg it from the wall to test it to see if it turns to battery power. If the unit goes to the battery backup normally then check to see if it has a reset button on the unit. Please let me know what size unit it is.

Yes, is the short aswer to your question. The battery should charge as you use the ups. If they don't then its likely the battery/s have failed. Lead acid batteries do not like being left discharged for any length of time. In a motor vehicle the battery gets a bit of shaking around, but in an ups they don't. If not used and left discharged, the plates quickly sulfate up reducing the efficiency to nearly zero. Test and replace any battery that cannot support a test load, such as a bright12v light or a 12v soldering iron connected to it. The length of time required to charge the battery/s depends on their capacity (in ampere/hours) and the charging rate. A 14.4 amp/hr battery charged at say 1 ampere will take 14-1/2hrs to charge.(just as a sample)

Very complicated these items. I have not been able to repair even apparently simple faults, manufacturers such as emerson/leibert do not release cct diagrams, so very difficult to fix as there are many different sections (pfc,rectifier,charger,upconverter,bypass,inverter) of the circuit all interconnected with a micro processor monitoring and controllling the whole thing. You have to be really lucky to sort out any problem particulary one with blown components.

Hope this helps

Thanks for using FixYa

Check on the back of the UPS to see if the input circuit breaker has tripped. Are you getting any lights on the front LED's? Also disconnect all loads and ensure nothing is plugged into the output receptacles. Also open UPS up and ensure the input fuse is not blown. You will need a meter to check this out.

It was not designed to do this.

go to google.com then type www.manualsonline.com