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UPS Network Management Card 2 User’s Guide36
• Voltage settings that determine the voltage at which the UPS begins to use automatic voltage
regulation or switches to battery operation and that determine how sensitive the UPS is to voltage
variation
• Bypass settings define conditions under which the UPS can switch to bypass mode
• Alarm thresholds based on available runtime and redundant power and on UPS load
The shutdown option
Setting Definition
Low Battery
Duration
How long the UPS can run on battery power after a low-battery condition occurs.
Note: This setting also defines the time available for PowerChute to shut down servers safely in
response to the Control option Signal PowerChute Network Shutdown Clients.
Maximum
Required
Delay
Reports the delay defined by the Maximum Required Delay setting, accessible through the
PowerChute option on the left navigation menu.
Note: For information about PowerChute features, including how Maximum Shutdown Time
is determined, see “PowerChute Network Shutdown configuration parameters” on page 45.
Shutdown
Delay
How long the UPS waits before it shuts down in response to a turn-off command.
Basic
Signaling
Shutdown
When enabled, provides safe system shutdown and notification, but without the advanced
features available with advanced signaling. Enable basic-signaling shutdown if your computer is
connected to the UPS by a basic-signaling cable, and the type of UPS either does not support
advanced signaling or is configured to communicate in basic signaling.
Basic Low
Battery
Duration
Available only for some UPS models. Defines the amount of available battery runtime at which
the UPS sends the signal for a low-battery shutdown if basic-signaling shutdown is enabled.
Sleep Time How long the UPS sleeps (keeps its outlet power turned off) when you use the Control option
Put UPS To Sleep.
Return
Runtime
Duration
Most APC UPSs support one of the following settings to ensure that the UPS batteries have time
to charge. Then, if input power fails soon after the UPS restarts, the UPS can perform a graceful
shutdown. (The UPS must also wait the time defined as Return Delay before it turns on.)
Return Runtime Duration: How long the UPS must be able to support the load by battery
power in order for the UPS to end its sleep time (or turn back on when rebooted) and resume
providing output power
Minimum Battery Capacity: The minimum battery capacity, as a percentage of full capacity,
required in order for the UPS to end its sleep time (or turn back on when rebooted) and resume
providing output power.
Minimum
Battery
Capacity
Return
Delay
How long the UPS waits before it turns on after a shutdown that was caused by a power failure
or after a scheduled shutdown.
N
OTE: The UPS must also have the capacity specified by the Minimum Battery Capacity
setting or the available runtime specified as Return Runtime Duration before it can turn on.