to Power On. This means that whenever the power is applied they are on. The only way to shut them off is to pull the plug or to have a special program that powers them off (/sbin/poweroff on Linux systems).

If after making all the changes suggested above, you cannot get your computer to automatically reboot, you might examine your halt script (/etc/rc.d/init.d/halt in the case of Red Hat Linux) and see if the final line that performs the halt or reboot contains the -p option for powering down the computer. It should not with the logic used by apcupsd, but if it does, the -p option could cause your computer to power off while the UPS is still suppling power (i.e. before the UPS kills the power). Depending on the setting of your BIOS, it may prevent your computer from restarting when the power returns. As already mentioned, this should not apply, but in case of problems it is worth a try.

Making sure apcupsd Is Running

The simplest way to invoke apcupsd is from the command line by entering:

/sbin/apcupsd

To do so, you must be root. However, normally, you will want apcupsd started automatically when your system boots. On some systems with in- stallation support (e.g. SUSE and Red Hat), the installation procedure will create a script file that you will be automatically invoked when your sys- tem reboots. On other systems, you will have to invoke apcupsd from your rc.local script.

On Red Hat systems, this script file that automatically invokes apcupsd on system start and stops is: /etc/rc.d/init.d/apcupsd

To start apcupsd manually (as you will probably do immediately following the installation), enter the following:

/etc/rc.d/init.d/apcupsd start

To understand how this file is automatically invoked at system startup and shutdown, see the man pages for chkconfig(8).

On SUSE systems, the script file that automatically invokes apcupsd on system start and stops is /etc/rc.d/apcupsd

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APC UPS control system manual Making sure apcupsd Is Running
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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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