Uninterruptible power supply, uninterruptible power supply system and shutdown processing program product

1. An uninterruptible power supply connected to between an AC power supply and a load device(s), comprising:

a communication means that communicates with the load device to which the uninterruptible power supply itself feeds power, via a network;

a UPS storage means that stores a waiting time until the load device starts shutdown after it is notified of detection of power abnormality of the AC power supply; and

a notification means that causes said communication means to provide notification of a remaining time until start of shutdown, in a time period until a time period corresponding to the waiting time stored in said UPS storage means elapses after the power abnormality of the AC power supply is detected.

2. The uninterruptible power supply according to claim 1 ,

wherein said notification means repeatedly causes the communication means to provide notification of the remaining time until start of shutdown, in the time period until the time period corresponding to the waiting time stored in said UPS storage means elapses after the power abnormality of the AC power supply is detected.

3. The uninterruptible power supply according to claim 1 ,

wherein said communication means provides notification of the remaining time until start of shutdown by a packet which does not need retransmission control or a packet with limitation on a number of retransmissions or retransmission time.

4. The uninterruptible power supply according to claim 1 ,

wherein when the AC power supply is restored before the time period corresponding to the waiting time stored in said UPS storage means elapses, said notification means causes said communication means to provide notification of a shutdown suspension instruction.

5. The uninterruptible power supply according to claim 1 ,

wherein said UPS storage means stores shutdown time until the load device(s) terminates shutdown after it starts shutdown; and

wherein when the AC power supply is restored after the time period corresponding to the waiting time stored in said UPS storage means elapses after the power abnormality of the AC power supply is detected, said notification means causes said communication means to provide notification of an activation instruction to the load device(s), after the shutdown time elapses.

6. The uninterruptible power supply system, comprising:

said uninterruptible power supply according to claim 1 ;

a network to which said communication means of said uninterruptible power supply is connected; and

a shutdown processing means that is provided in a load device(s) to which power is fed by said uninterruptible power supply and which is connected to the network, and starts shutdown processing when a remaining time elapses, when it is notified of the remaining time until start of shutdown by said uninterruptible power supply.

7. The uninterruptible power supply system according to claim 6 , wherein said network uses the Internet protocol.

8. The uninterruptible power supply system according to claim 6 ,

wherein said network has a network device(s) which is operated by power feed, and transmits a remaining time until the shutdown is started.

9. The uninterruptible power supply system, comprising:

a plurality of said uninterruptible power supplies according to claim 1 ;

a network to which a plurality of said communication means of a plurality of said uninterruptible power supplies are connected;

a load storage means that is provided in a load device(s) to which power is fed by a plurality of said uninterruptible power supplies and which is connected to the network, and stores one shutdown mode of a power feed priority mode which starts shutdown when all of a plurality of said uninterruptible power supplies detect power abnormality of AC power supplies, and a shutdown priority mode which starts shutdown when one of a plurality of said uninterruptible power supplies detects power abnormality of the AC power supply;

a determination means that is provided in the load device(s), judges whether or not the shutdown mode stored by said load storage means is to be established when it is notified of remaining times until start of the shutdown by a plurality of said uninterruptible power supplies, and determines starting time of shutdown processing when the shutdown mode is to be established; and

a shutdown processing means that is provided in the load device(s), and starts shutdown processing at the starting time determined by said determining means.

10. The uninterruptible power supply system according to claim 9 ,

wherein said network uses the Internet protocol.

11. The uninterruptible power supply system according to claim 9 ,

wherein said network has a network device(s) which is operated by power feed, and transmits a remaining time until the shutdown is started.

12. A computer readable program product for shutdown processing, which causes a computer to which power is fed by an uninterruptible power supply and which is connected to a network that is notified of a remaining time until start of shutdown by the uninterruptible power supply to realize

a determining means that determines starting time of shutdown processing based on the remaining time of which it is notified; and

a shutdown processing means that starts shutdown processing at the starting time determined by said determining means.