Browse FAQs



Why are the Overload and On-Line LEDs flashing on my APC Back-UPS?
Back-UPS CS, Back-UPS PRO, Back-UPS USB , Back-UPS LS, Back-UPS NS/XS ...
Why might the LEDs on my Back-UPS or Smart-UPS SC be flashing?
Back-UPS Pro, Back-UPS USB , Back-UPS LS, Back-UPS CS, Back-UPS NS/XS ...
Configuration of an APC USB UPS and Multiple USB Devices
Product Line: Back-UPS and Back-UPS PRO
Communication is Interrupted to USB Devices
Product Line: Back-UPS , Back-UPS PRO, Back-UPS ES,
Back-UPS is detected as an ""Unknown Device"" in Device Manger
Towards the bottom, you should see, "" Universal Serial Bus controllers"" ... and "" USB Root Hub"".
Why is my Mac OS not a supported system for PowerChute Personal Edition v3.1?
Environment: Mac OS X attached to APC Back-UPS via USB cable
Native serial shutdown on Microsoft Windows OS
For Back-UPS use USB or if the Back-UPS is compatible with serial communications use USB to Serial converter.
Why is my Back-UPS ES giving a Constant tone with the Power on LED flashing?
Verify that the UPS is not being overloaded: - The Back-UPS ES 350 can support 350va or 200watts on the battery powered outlets.


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