onbattery This event is generated 5 or 6 seconds after an initial pow- erfailure is detected. It means that apcupsd definitely considers the UPS to be on batteries. The onset of this event can be delayed by the ONBATTERYDELAY apcupsd.conf configuration directive.

Default — does a printf ‘‘Power failure. Running on UPS batteries.’’ wall then exits.

offbattery This event is generated when the mains return only if the onbattery event has been generated.

Default — does nothing.

powerout This event is generated immediately when apcupsd detects that the UPS has switched to batteries. It may be due to a short power- failure, an automatic selftest of the UPS, or a longer powerfailure. In many cases, you may want to inhibit the normal message sent/emailed by this event to avoid being annoyed by short power failures.

Default — does a printf ‘‘Warning power loss detected.’’ wall then exits.

remotedown This event is generated on a slave machine when it detects either that the master has shutdown, or that a onbattery situation exists and the communications line has been severed. Despite the name, you should never reboot the machine — instead always shut it down.

Does a shutdown -h now

restartme This event is depreciated and should not be used.

Terminates the currently running apcupsd and then restarts it.

runlimit This event is generated when the MINUTES value defined in the apcupsd.conf file expires while in a power fail condition. The MINUTES is the remaining runtime as internally calculated by the UPS and monitored by apcuspd.

Does a printf ‘‘UPS battery runtime percent reached. Doing shutdown.\n’’ wall then exits. After completing this event, apcupsd will immediately initiate a doshutdown event.

timeout This event is generated when the TIMOUT value defined in the apcupsd.conf file expires while in a power fail condition. It indicates that the total time in a power failure has been exeeded and the machine should be shutdown. Normally, with smart UPSes, this value is not used, but rather one relies on the remaining runtime (MINUTES) or the battery level (BATTERYLEVEL) values specified in the conf file.

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UPS control system specifications

APC UPS (Uninterruptible Power Supply) control systems are vital components for ensuring uninterrupted power supply and protecting critical equipment from power interruptions, surges, or fluctuations. Designed by Schneider Electric, APC UPS systems are renowned for their high quality and reliability. They utilize advanced technologies and features to suit diverse applications, from home offices to large industrial settings.

One of the main features of APC UPS systems is the ability to provide backup power during outages. This is achieved through a battery system that activates immediately when the mains power fails. This seamless transition minimizes downtime and ensures that electronic devices continue to operate, protecting data integrity and equipment lifespan.

Another significant characteristic of APC UPS systems is their intelligent management capabilities. Most models come with PowerChute software, which provides users with real-time monitoring of power conditions and the status of the UPS. This software allows for graceful shutdowns of connected devices during extended outages, thereby preventing data loss and damage to devices.

APC UPS systems also incorporate advanced technologies such as Automatic Voltage Regulation (AVR). AVR technology ensures that the output voltage remains stable by correcting minor fluctuations without switching to battery mode. This not only prolongs the battery life but also provides a consistent power supply to the connected equipment.

Thermal management is another critical aspect of APC UPS control systems. The design often includes efficient cooling systems that prevent overheating, ensuring optimal performance and longevity of the unit. Some models feature EcoMode, which reduces energy consumption and lowers operational costs by working at high efficiency only when battery backup is not required.

APC UPS systems are designed with scalability in mind. Users can easily add more batteries or connect additional UPS units to accommodate growing power needs. Features such as hot-swappable batteries and modular design facilitate easy upgrades and servicing without interrupting power supply.

In terms of connectivity, APC UPS products often feature multiple options including USB, RS-232, and network management capabilities. This enables users to connect remote management tools and integrate the UPS with existing IT infrastructure.

In summary, APC UPS control systems deliver reliability, efficiency, and advanced technology features that cater to a wide array of power protection needs, making them a trusted choice for individuals and businesses alike.
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