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Key Concepts
continued
Low Battery
signal
The Interface Expander generates a Low Battery signal
when it detects a Low Battery condition at the UPS, regard-
less of whether the UPS is on battery. The Interface
Expander generates a Low Battery signal under certain
other conditions according to the configured shutdown
mode (see “Configuring the Interface Expander” on page
19), when it may force a Low Battery signal and an On Bat-
tery signal, causing the servers to shut down.
Scheduled
shutdowns
When a server connected to the (Advanced) computer inter-
face port on the UPS is running UPS-monitoring software
such as PowerChute plus, you can execute scheduled or
supervised UPS shutdowns for the servers connected to the
Interface Expander. The Interface Expander intercepts the
shutdown signal and sends the following messages to all
attached servers or devices:
• On Battery and Low Battery signals (for the low-bat-
tery duration set in the UPS)
• Shutdown commands (e.g., Sleep, Turnoff, etc., as
requested by PowerChute plus)
The servers connected to the Basic ports to shut down
gracefully before they lose power when the UPS output is
turned off—a feature normally available only to servers
using PowerChute plus and smart signaling.
Continued on next page