JP3869563B2 - Air conditioning system - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an air conditioning system in which operations of a plurality of indoor units are centrally controlled by a central control device.
[0002]
[Prior art]
In recent years, in air conditioning systems used for cooling and heating in large stores, office buildings, and the like, the operation of a plurality of indoor units is centrally controlled by a centralized control device. At this time, each indoor unit operates based only on the control signal designating itself from the central control apparatus, and ignores the control signal designating other indoor units.
[0003]
[Problems to be solved by the invention]
As described above, since there are a large number of indoor units that are centrally controlled by one centralized control device, each indoor unit requires a large amount of time to determine that periodic communication from the centralized control device has been interrupted. Resulting in.
[0004]
For example, when 64 indoor units are connected to one centralized control device, and this centralized control device performs regular communication with one indoor unit at intervals of 4 seconds, the centralized control device It takes 64 × 4 (seconds) = 4 minutes and 16 seconds to complete communication with the indoor unit. Therefore, after 4 minutes and 16 seconds have elapsed, each indoor unit determines that communication has been interrupted due to a failure of the central control device when communication with respect to itself has not been transmitted from the central control device.
[0005]
Moreover, the centralized controller any indoor unit, when it is carried out centralized control of remote operation prohibition, when the centralized controller had failed, the control of the remote operation prohibition of the indoor unit It will not be released. For this reason, after the control of the remote controller operation prohibition is canceled by shutting off the power supply of the indoor unit, the power must be turned on again to restart the operation. In this way, complicated work is required when the central control apparatus fails.
[0006]
The subject of this invention is made in view of the above-mentioned situation, and is providing the air conditioning system which can determine rapidly that communication from the centralized control apparatus to the indoor unit was interrupted.
[0007]
[Means for Solving the Problems]
The invention according to claim 1 is an air conditioning system in which the operation of a plurality of indoor units can be controlled by a centralized control device, and the indoor unit communicates from the centralized control device to itself and other indoor units. It is always received , the indoor unit itself detects that the communication has not been transmitted for a certain period of time, determines the failure of the centralized control device, and changes to the operation content preset by the centralized control device It is configured to be possible .
[0009]
The invention described in claim 1 has the following action.
[0010]
Each indoor unit is configured to receive communication from the central control device to itself and other indoor units and to determine the operation status of the central control device. When communication to be performed is not performed for a certain time or more, it can be quickly determined that communication has been interrupted due to a failure of the central control apparatus.
[0011]
The invention according to claim 2 has the following effects.
[0012]
The indoor unit is configured so that it can be changed to the operation content preset by the central control device when communication with the central control device is interrupted. For example, even when the remote control operation prohibition control is performed by the apparatus, complicated work such as releasing the control by the central control apparatus by turning off the power supply and restarting the operation by turning on the power supply again becomes unnecessary. As a result, the corresponding operation of the indoor unit when communication with the central control device is interrupted can be quickly performed.
[0013]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the drawings.
[0014]
FIG. 1 is an overall configuration diagram showing an embodiment of an air conditioning system according to the present invention.
[0015]
The air conditioning system 10 shown in FIG. 1 includes a plurality of (for example, four) outdoor units 11 and 12, a plurality of indoor units 13, 14, and 15, these outdoor units 11 and 12, and an indoor unit 13, And a centralized control device 16 that performs centralized control of 14 and 15.
[0016]
The outdoor unit 11 is a main outdoor unit, and the outdoor unit 12 is a sub outdoor unit. A built-in compressor is driven by an electric motor or an engine. The outdoor units 11 and 12 and the indoor units 13, 14 and 15 are connected by a refrigerant pipe (not shown), and the indoor units 13, 14 and 15 cool or heat the room.
[0017]
The outdoor units 11 and 12 and the indoor units 13, 14, and 15 each include a control device (not shown). Among these, the indoor unit 14 can be controlled by inputting a control signal from the remote controller 17 to the built-in control device, and the indoor unit 15 is controlled by a control signal from the remote controller 18. Can be controlled.
[0018]
Further, the outdoor units 11 and 12 and the indoor units 13, 14 and 15 are connected to the central control device 16 by a non-polar two-wire operation line 19. The centralized control device 16 periodically communicates with the outdoor units 11 and 12 and the indoor units 13, 14 and 15 via the operation line 19, so that these outdoor units 11 and 12 and the indoor units 13 and 14 are communicated. And 15 can be centrally controlled.
[0019]
That is, the centralized control device 16 includes an address code for designating the outdoor unit 11 or 12 or the indoor unit 13, 14 or 15, and control data for controlling the outdoor unit 11 or 12 or the indoor unit 13, 14 or 15. A control signal having the following is output. Then, each control device of the outdoor unit 11 or 12 or the indoor unit 13, 14 or 15 takes in this control signal when the control signal to which the address code indicating itself is transferred is transferred, and performs this control. Controls its own operating state based on the control data in the signal. In this way, the outdoor units 11 and 12 and the indoor units 13, 14 and 15 are configured to be centrally controlled by the central control device 16.
[0020]
On the other hand, the control devices of the indoor units 13, 14, and 15 always receive communication from the central control device 16 to itself and other indoor units while the central control is performed by the central control device 16. The operating status of the centralized control device 16 is determined. That is, the control device of each indoor unit 13, 14, 15 always receives a control signal addressing itself and other indoor units from the central control device 16, and when this control signal has not been transmitted for a certain period of time, It is determined that communication from the centralized control device 16 has been interrupted, and it is determined that the centralized control device 16 has failed and is not in operation.
[0021]
Further, in the control device of each indoor unit 13, 14, 15, the operation content when communication from the central control device 16 is interrupted is preset by the central control device 16. Therefore, when the communication from the central control device 16 is interrupted, the control device of each indoor unit 13, 14, 15 is immediately changed to the operation content (immediate stop or reduction of the driving capability) preset by the central control device 16. Configured to be.
[0022]
Therefore, according to the above embodiment, the following effects (1) and (2) are achieved.
[0023]
(1) Since each indoor unit 13, 14, 15 is configured to receive communication from the central control device 16 to itself and other indoor units and determine the operating status of the central control device 16, When communication from the central control device 16 to itself and other indoor units has not been performed for a certain period of time, it can be quickly determined that communication has been interrupted due to the failure of the central control device 16.
[0024]
(2) The indoor units 13, 14, and 15 are configured to be able to be changed to the operation content preset by the central control device 16 when communication with the central control device 16 is interrupted. Even when the central control device 16 is controlled to prohibit the remote control operation, for example, before the communication is interrupted, the control by the central control device 16 is canceled by turning off the power, and the operation is resumed by turning on the power again. Such complicated work is not required. As a result, when the communication with the central control device 16 is interrupted, the corresponding operation (such as an immediate stop or a decrease in driving ability) of the indoor units 13, 14, 15 can be quickly performed.
[0025]
As mentioned above, although this invention was demonstrated based on one Embodiment, this invention is not limited to this.
[0026]
【The invention's effect】
As described above, according to the air conditioning system of the present invention, each indoor unit receives communication from the central control device to itself and other indoor units, and determines the operating status of the central control device. Since it is configured, it can be quickly determined that communication from the central control device to the indoor unit has been interrupted.
[Brief description of the drawings]
FIG. 1 is an overall configuration diagram showing an embodiment of an air conditioning system according to the present invention.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 10 Air conditioning system 11 Outdoor unit 12 Outdoor unit 13 Indoor unit 14 Indoor unit 15 Indoor unit 16 Centralized controller 19 Operation line

Claims (1)

In an air conditioning system that enables operation of a plurality of indoor units to be controlled by a centralized control device,
The indoor unit constantly receives communication from the centralized control device to itself and other indoor units , detects that the indoor unit itself has not transmitted the communication for a certain period of time, and performs the centralized control. An air-conditioning system configured to be able to change the operation content preset by the centralized control device while determining whether the device has failed .

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