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Troubleshooting 31
1.
If the Overload LED is illuminated, remove one or more load devices to reduce the power
requirements.
2. Power down the UPS ("Powering down the UPS" on page 22).
3. Verify the batteries are connected.
4. Allow the UPS batteries to charge for 24 hours.
5. Initiate a self-test ("Initiating a self-test" on page 22).
6. During extended power outages, save your work, power down the load devices, and then power
down the UPS ("Powering down the UPS" on page 22) to conserve battery power.
UPS cannot communicate with the host computer
Action:
• Verify only one communications port is connected to the host computer ("Connecting the host
computer" on page 17).
• If an option card is installed, verify the host computer is only connected to the option card. Installing
an option card automatically disables the built-in serial and USB communications ports.
UPS emits a slight clicking noise
Action: The UPS is automatically correcting high or low AC voltage on the utility line. No action is
required.
Site Wiring Fault LED is red
Action: Contact a qualified electrician to be sure that:
• The utility power receptacle is grounded.
• There is a ground wire in the UPS power cord.
• The line and neutral wires are not reversed in the wall outlet.