the slaves to perform a shutdown then apcupsd will sleep for 30 sec- onds before issuing the shutdown of its own computer. If you need the master to wait additional time before shutting down (to allow for shutdown of slower slaves or of slaves running software that requires more time to shutdown – e.g. databases), you can do so by adding additional sleep() commands to /etc/apcupsd/apccontrol in each case that causes a shutdown.

TIMEOUT, BATTERYLEVEL, and MINUTES can be set to- gether without problems. apcupsd will react to the first case or test that is valid. Normally SmartUPS users will set TIMEOUT to zero so that the system is shutdown depending on the percentage bat- tery charge remaining (BATTERYLEVEL) or the remaining bat- tery runtime (MINUTES).

KILLDELAY <time in seconds> If killdelay is set, apcupsd will con- tinue running after a shutdown has been requested, and after the spec- ified time in seconds, apcupsd will attempt to shut off the UPS the power. This directive should normally be disabled by setting the value to zero, but on some systems such as Win32 systems apcupsd cannot regain control after a shutdown to force the UPS to shut off the power. In this case, with proper consideration for the timing, the KILLDE- LAY directive can be useful. Please be aware, if you cause apcupsd to kill the power to your computer too early, the system and the disks may not have been properly prepared. In addition, apcupsd must con- tinue running after the shutdown is requested, and on Unix systems, this is not normally the case as the system will terminate all processes during the shutdown.

Configuration Directives used to Control System Logging

STATTIME<time> This directive supplies the time interval between writes to the STATUS file. If set to zero, the STATUS file will not be written. Please note that in a future version of apcupsd the STA- TUS file code will disappear since its functionality has been replaced by the Network Information Server and by apcaccess status, as a consequence, it is normally disabled by setting it to zero.

STATFILE <file> This directive specifies the file to be used

when writing the STATUS information. The default is /etc/apcupsd/apcupsd.status.

DATATIME<time> This directives supplies the time interval between writes of PowerChute&tm; like data information to the log file. See

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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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