Uninterruptible power supply: Difference between revisions
quip about replacing battery pack |
→Delay UPS Shutdown: fix formatting |
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During the system shutdown, systemd service unit runs the command | During the system shutdown, systemd service unit runs the command | ||
upsdrvctl shutdown. This tells the UPS that it is to shut down | <code>upsdrvctl shutdown</code>. This tells the UPS that it is to shut down | ||
offdelay seconds later. The system powers down before offdelay seconds | offdelay seconds later. The system powers down before offdelay seconds | ||
have passed. Wall power returns before the UPS shuts down Less than | have passed. Wall power returns before the UPS shuts down. Less than | ||
offdelay seconds have passed. The UPS continues it's shutdown | offdelay seconds have now passed. The UPS continues it's shutdown | ||
process. | process. | ||
After offdelay seconds the UPS shuts down, disconnecting it's | After offdelay seconds the UPS shuts down, disconnecting it's | ||
outlets. The beeping stops. With some UPS units, there is an audible | outlets. The beeping stops. With some UPS units, there is an audible | ||
clunk. An interval of ondelay | clunk. An interval of ondelay minus offdelay seconds later: After ondelay | ||
seconds the UPS turns itself on, and repowers it's outlets. The system | seconds the UPS turns itself on, and repowers it's outlets. The system | ||
BIOS option Restore Power on AC return has hopefully been selected and | BIOS option Restore Power on AC return has hopefully been selected and | ||