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Operation
Modes of Operation
The UPS has five modes of operation, indicated by the LEDs (see Figure 2-3):
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Standby Mode
— When utility is present and output is off, the Utility LED (1) flashes slowly.
— Power is not available at the UPS output.
— The UPS monitors and charges batteries, if required.
Operate Mode
— The Utility LED (1) is solid green.
— The UPS is supplying power to the loads.
— The UPS monitors and charges batteries, if required.
Bypass Mode
— The Utility LED (1) and Battery LED (2) are off.
— The Bypass LED (3) is solid amber, and an audible alarm is active.
— The Alarm LED (4) is solid red.
— The utility is bypassing the unit and going directly to the load.
— The UPS monitors and charges batteries, if required.
Battery Mode
— The Battery LED (2) is solid amber.
— The Alarm LED (4) is solid red.
— Utility power is not present.
— The UPS does not charge the batteries.
— Power is available at UPS outputs.
Redundant Mode
— The Redundant LED (5) is solid green.
— At least one electronics module of the load can be in a redundant state (two or more
electronics modules working).
— All electronics modules share the load, but there is enough power to allow an
electronics module to go out of service.
2-4 HP Uninterruptible Power System R12000 XR Models User Guide
HP CONFIDENTIAL Codename: Sierra Part Number: 146316-002 Last Saved On: 1/24/03 10:14 AM