Uninterruptible power supply
An uninterruptible power supply provides a source of ac power if utility power should fail. Typically, an uninterruptible power supply has a finite backup time.
An uninterruptible power supply supplies power to the system and all associated disk unit controllers and devices during a utility power failure. The run time of the uninterruptible power supply should be sized appropriately for a power-loss controlled shutdown.
Three system values affect an uninterruptible power supply. These system values define the action the system takes in response to a change in the power supply signal when an uninterruptible power supply is attached:
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Controlled shutdown conceptsRelated concepts
Power-loss controlled shutdown Uninterruptible power supply delay time system value (QUPSDLYTIM) Weak battery condition signal from uninterruptible power supply