A:This problem and the problem of cannot create shm area are due to the fact that the shared memory key that apcupsd wants to use is already in use. This happens most frequently when there is an old zombie apcupsd process still in the system. The solution is to remove the old process. You can often see what is going on by doing a: ipcs command as root when apcupsd is not running. If you see a segment with the key 0x10feed01, you can be sure there is some old apcupsd process still using it. If you cannot kill the old process, you can try using ipcrm (see the man pages). Recent versions of apcupsd starting with apcupsd-3.8.2Beta6 should no longer have this problem as they will automatically try using a different key.

Q:I get the following error: “Starting apcupsd power management. Mar 20 21:19:40 box apcupsd[297]: apcupsd FATAL ERROR in apcserial.c at line 83. Cannot open UPS tty /dev/cua01: No such file or directory.” What is the problem?

A:The two most likely causes of your problem are: 1. You have the wrong serial port device name in the apcupsd.conf file. 2. The device name is not defined on your system. Suggestions for proceeding:For the first item, check what your serial port device should be named. You might be able to find the name with an:

ls /dev

Normally there will be hundreds or even thousands of names that print. If that doesn’t produce anything useful, you can try step 2. Perhaps your device is not defined. To get more information on your devices try man MAKEDEV or find / -name MAKEDEV. It is often located in /dev/MAKEDEV. Looking at the documentation may tell you what the correct name is, or at least allow you to create the device.

Q:How do I ensure that the slaves shutdown before the master?

A:There are several strategies for getting the slaves properly shutdown before shutting down the master. The first is to make the master wait a period of time for the slaves to shutdown before doing its own shutdown. Currently, the master always waits 30 seconds be- fore starting its own shutdown. If this is insufficient, you can add additional time by putting an appropriate sleep shell command in the /etc/apcupsd/apccontrol file just before the actual system shutdown command is executed (there are something like 3 places). The second strategy is to put a TIMEOUT value in the apcupsd.conf file on the

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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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