JP3402802B2 - Centralized control device - Google Patents

Abstract

PURPOSE: To make it possible to control locally on an indoor equipment side even when a power source of a main controller is subjected to a power failure. CONSTITUTION: This invention relates to an integrated control device which is provided with a plurality of devices intended to be controlled and a plurality of other devices intended to be controlled, which are connected to a power source of a different system and a main control device 2-1 , which controls the above devices intended to be controlled by way of a communication line LM. The main control device 2-1 is provided with a voltage detection means 36 which detects the voltage of the power source PW and outputs a voltage detection signal and a prohibition release means 34 which outputs a local control enable signal which enables local control by way of the communication line LM at least, for the devices to be controlled, whose local control is in a prohibited state in case when the voltage of the power source fails to exceed a specified voltage based on the voltage detection signal.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a centralized control device,
In particular, it relates to a centralized control device for centrally controlling a plurality of air conditioners.

[0002]

2. Description of the Related Art Conventionally, a common outdoor unit and a common main controller are provided to connect a plurality of indoor units, and the main controller controls the entire system.
There is an air-conditioning centralized control system in which a sub-controller provided in each indoor unit on the side of each user locally controls the indoor unit (hereinafter referred to as local control).

In such a centralized heating and cooling management system, the cost and the installation area, etc. are compared with the case where an outdoor unit and an indoor unit are individually provided in order to obtain the same cooling and heating capacity (hereinafter referred to as an individual management system). It was advantageous from the point.

By the way, in the individual management system,
The power supply to which the individual management system is connected is generally common to all the individual management systems, but in the above centralized management system, the power supply of the main controller depends on the installation location, power capacity, etc. In some cases, a common outdoor unit power source and each indoor unit power source were provided separately.

[0005]

In the above-mentioned individual management system, when the power supply to which the individual management system is connected fails, the whole system becomes inoperable, so no problem occurs. In the management system, only the power supply of the main controller sometimes went into a power failure state.

When such a situation occurs, the main controller has already ordered each indoor unit to prohibit local control (hereinafter referred to as local control prohibition command).
However, there is a problem in that the local control prohibition command cannot be canceled in each indoor unit, and the uncontrollable state occurs until the power of the main controller is restored.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a centralized control device capable of locally controlling indoor units even when the power supply on the main controller side falls into a power failure state.

[0008]

In order to solve the above problems, the invention according to claim 1 is characterized in that a plurality of controlled devices and the plurality of controlled devices are connected to a power source of a different system, and A central control device comprising: a main control device that controls a plurality of controlled devices via communication lines, wherein the main control device detects a voltage of the power supply and outputs a voltage detection signal. And a local control permission signal that enables local control to at least the controlled device in which local control is prohibited when the voltage of the power source becomes equal to or lower than a predetermined voltage based on the voltage detection signal. And a prohibition releasing means for outputting via the communication line.

According to a second aspect of the present invention, the plurality of controlled devices are connected to a power source of a different system from the plurality of controlled devices, and the plurality of controlled devices are controlled via a communication line. A central control device including a main control device,
The main control device detects a voltage of the power supply and outputs a voltage detection signal, and at least local control is performed when the voltage of the power supply becomes equal to or lower than a first voltage based on the voltage detection signal. To the controlled device in the prohibited state, a prohibition releasing means for outputting a local control permission signal for enabling local control through the communication line, and a voltage of the power supply after the local control permission signal is output. Prohibition setting means for outputting a local control prohibition signal via the communication line to at least the controlled device to be set to the local control prohibition state when the voltage becomes equal to or higher than the second voltage higher than the first voltage. , Prepare and configure.

[0010]

According to the invention described in claim 1, the voltage detecting means detects the voltage of the power source and outputs the voltage detection signal to the prohibition releasing means.

The prohibition canceling means enables local control to at least the controlled device whose local control is prohibited when the voltage of the power source becomes a predetermined voltage or less based on the voltage detection signal. The signal is output via the communication line.

Therefore, when the power supply voltage on the main control unit side becomes equal to or lower than a predetermined voltage, each controlled device is brought into a locally controllable state.

According to the second aspect of the invention, the voltage detecting means detects the voltage of the power source and outputs a voltage detection signal to the prohibition releasing means.

The prohibition canceling means allows local control to allow local control to at least the controlled device whose local control is prohibited when the voltage of the power source becomes a predetermined voltage or less based on the voltage detection signal. The signal is output via the communication line.

The prohibition setting means sets at least the controlled device to be set to the local control prohibition state when the voltage of the power source becomes equal to or higher than the second voltage higher than the first voltage after the local control permission signal is output. On the other hand, the local control prohibition signal is output through the communication line.

Therefore, when the power supply voltage on the main controller side becomes equal to or lower than the first voltage, each controlled device is brought into a locally controllable state, and the power supply voltage on the main controller side is equal to or higher than the second voltage. At this stage, at least the controlled device that should be set to the local control prohibited state again becomes the local control prohibited state.

[0017]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT A preferred embodiment of the present invention will now be described with reference to the drawings.

FIG. 1 shows a schematic block diagram of a centralized control type cooling and heating system.

The cooling and heating system 1 is roughly divided into a power source P.
A plurality of communications that function with a main controller 2 that is connected to W and controls the entire system 1 and a terminal processing control device that is connected to the main controller 2 via a two-wire main communication line LM that uses a multiplex transmission method. Adapter 3 _{-1 to} 3
_-3 and a power source (not shown) of a system different from the power source PW, and connected to each of the communication adapters 3 _{-1 to} 3 _-3 through a 2-wire type sub communication line like the main communication line. And a control device group UG.

As shown in FIG. 2, the main controller 2 is roughly divided into a controller body 2 for performing various controls.
_-1 , a display unit 2 _-2 for displaying various setting data, the operating state of the controlled device, etc., and a printer 2 _-3 for printing out various data.

The controller main body 2-1 includes a RAM 30 for temporarily storing various data, a non-volatile RAM 31 for updating data at the time of start-up or recovery from power failure, a control program and a control program. A ROM 32 in which data is stored, a communication control board 33 having a configuration similar to that of a communication adapter to be described later, a control board 34 for mounting various controls including a CPU (not shown), a display unit _2-2 and a printer 2 _-3 , an interface unit 35 that performs an interface operation, a voltage detection unit 36 that detects the voltage of the power supply PW, and an input operation unit 37 that sets and inputs various data to the control board 34. It is configured.

The communication adapter 3 _-1 , as shown in FIG.
A CPU10 which controls the entire communication adapter 3 _-1, control program, and ROM11 which data, etc. are stored, a RAM12 for storing temporarily various data, an interface unit 13 which performs interface operations with the outside,
The CPU 10, the ROM 11, and the R
The AM 12 and the interface unit 13 are connected via a bus. Furthermore the indoor unit, the controlled device U ₁ ~U _n of the outdoor unit, etc., are connected via the interface unit 13 and the bus. The same applies to the other communication adapters 3 _{-2 to} 3 _-3 .

Although various modes of the controlled device group UG are conceivable, one example thereof will be described below with reference to FIG.

The first communication adapter 3 _-1 has a sub communication line L.
The plurality of indoor units 20 and the outdoor unit controller 21 are connected via S ₁ , and the plurality of outdoor units 22 are further connected via the outdoor unit controller 21.

[0025] The second communication adapter _3-2, a plurality of indoor units via the first sub communication line LS21 20 and one outdoor unit 22
Is connected to the first controlled device group, and the second controlled device group to which a plurality of indoor units 20 and one outdoor unit 22 are connected is also connected via the second sub communication line LS22. There is.

The sub communication line L is connected to the third communication adapter 3 _-3.
A plurality of indoor / outdoor unit sets 24 in which one outdoor unit is connected to one indoor unit 20 are connected via S ₃ , and further, via a group control communication line GL which is a control line of one remote controller 25. Multiple indoor / outdoor unit set 26
Are connected.

Further, all the indoor units 20 and the outdoor units 22 are provided with a current detection circuit CT which detects a power supply current of the device and outputs current detection data.

Next, the operation will be described with reference to FIGS. 2, 4 and 5.

The controller unit 2 _-1 control board 34 reads out the data representative of a controlled device local control from the non-volatile RAM31 is prohibited, as well as transferred to the local control inhibition target device data LCL,
Data (flag) indicating whether the local control prohibition command is valid is transferred from the nonvolatile RAM 31 to the local control prohibition release flag FRG (step S1). In this case, it is assumed that the initial value of the local control prohibition release flag FRG is set to "0" (= the local control prohibition command is valid).

Next, the control board 34 determines whether or not the local control prohibition release flag FRG is set to "1", that is, whether or not the local control prohibition command is set to invalid (step S2). .

In the determination of step S2, when the local control prohibition release flag FRG is "1", that is, when the local control prohibition command is set to be invalid,
The control board 34 refers to the local control prohibition target device data LCL, transmits a local control prohibition signal to the controlled device whose local control is prohibited through the communication control board 32, and sets the local control prohibition release flag FRG. It is set to "0", the data of the local control prohibition release flag FRG is transferred to the non-volatile RAM 31 (step S9), and the process shifts to the normal process.

More specifically, when the maximum number of controlled devices that can be controlled by the main controller 2 is 8, the local control prohibition target device data LCL is represented by 8 bits.

For example, the local control prohibition target device data LCL = "01100010" means that "0" represents the local control permission state, "1" represents the local control prohibition state, and its bit position is Each corresponds to a controlled device. That is, the local control prohibition target device data LCL = “01100010” is the second,
The third and seventh controlled devices are in the local control prohibited state, and the first, fourth to sixth and eighth controlled devices are in the local control permitted state.

In the determination of step S2, if the local control prohibition release flag FRG is "0", that is, if the local control prohibition command is set valid,
The control board 34 refers to the local control prohibition target device data LCL and counts the number of controlled devices for which local control is prohibited (step S3). More specifically, the number of "1" s in the above-mentioned local control prohibition target device data LCL is counted.

Next, it is determined whether or not the number of controlled devices for which local control is prohibited is greater than 0 based on the count result of step S3 (step S4).

When the number of controlled devices for which local control is prohibited in the determination in step S4 is 0, that is, when the local control prohibition target device data LCL is all "0", the local control prohibition is released. Flag F
RG is set to "0" (step S10), and the process shifts to normal processing.

When the number of controlled devices for which local control is prohibited in the determination in step S4 is greater than 0, that is, local control prohibition target device data LCL.
If at least one bit of the local control prohibition target device data LCL is "1"
Transfer to AM31 (step S5).

Next, the first reference voltage V, which is a local control prohibition release voltage having a detection voltage V of the power source PW detected by the voltage detection unit 36, which is higher than the reset voltage VRST of the microcomputer in the main controller by a predetermined voltage.
It is determined whether it is lower than ref1 (see FIG. 5), that is, whether the power supply voltage is normal (step S6).

In the determination of step S6, the detected voltage V
Is equal to or higher than the first reference voltage Vref1, that is, when the power supply voltage is normal, the local control prohibition release flag FR
G is set to "0" (step S10), and normal processing is started. As a result, the local control prohibition command is effectively set, and the controlled device for which the local control is prohibited based on the local control prohibition target device data LCL cannot perform the local control.

In the determination of step S6, the detected voltage V
Is less than the first reference voltage Vref1, that is, when the power supply voltage is abnormally lowered due to a power failure, a momentary power failure, etc., the control board 34 refers to the local control prohibition target device data LCL, and the local control is performed. A local control permission signal is transmitted to the prohibited controlled device via the communication control board 32, the local control prohibition release flag FRG is set to "1", and the local control prohibition release flag FRG is stored in the nonvolatile RAM 31. Transfer (step S7).

Next, the power source P detected by the voltage detector 36 again
A second detection voltage V of W is a local control inhibition set voltage
Is higher than the reference voltage Vref2 (see FIG. 5), that is, whether the power supply voltage has returned to normal (step S8).

In the determination of step S8, the detected voltage V
Is higher than the second reference voltage Vref2, the control board 34 controls the local control prohibition target device data LC.
Referring to L, the local control prohibition signal is transmitted via the communication control board 32 to the controlled device whose local control is prohibited, and the local control prohibition release flag F is sent.
RG is set to "0" and the local control prohibition release flag F
RG is transferred to the non-volatile RAM 31 (step S
9), shift to normal processing.

As a result, as shown by the alternate long and short dash line in FIG.
If the power supply voltage changes due to a momentary power failure, that is, if the power supply voltage drops below the first reference voltage Vref1 but does not reach the reset voltage VRST, the local control inhibit command is invalidated. The operation can be performed normally without

In the determination of step S8, the detected voltage V
Is less than or equal to the second reference voltage Vref2, the process directly shifts to the normal process.

As described above, according to this embodiment, the power source voltage of the power source PW is the first reference voltage Vref1 due to a power failure or the like.
When it becomes lower than the above, the controlled device in the local control prohibited state becomes the locally controllable state, and even if the main controller becomes inoperable, each controlled device side can control.

[0046]

According to the first aspect of the invention, the prohibition canceling means is such that at least the local control is in the prohibited state when the voltage of the power source becomes equal to or lower than a predetermined voltage based on the voltage detection signal. In contrast, since a local control permission signal that enables local control is output via the communication line,
When the power supply voltage on the main controller side falls below a predetermined voltage, each controlled device becomes a local control enabled state and can operate on each controlled device side, and the main controller side falls into an inoperable state. If you do so, the entire system will not go down.

According to the second aspect of the invention, the prohibition canceling means is provided for at least the controlled device in which the local control is prohibited when the voltage of the power source becomes equal to or lower than a predetermined voltage based on the voltage detection signal. The local control permission signal for enabling the local control is output via the communication line, and the prohibition setting means outputs the local control permission signal, and the voltage of the power supply becomes equal to or higher than the second voltage higher than the first voltage. In this case, at least the local control prohibition signal is output to the controlled device which should be set to the local control prohibition state through the communication line. Therefore, when the power supply voltage on the main control device side falls below the first voltage, The controlled device is brought into the local control enable state, and at the stage when the power supply voltage on the main control device side becomes equal to or higher than the second voltage, at least the local control prohibited state is set again. Control device, a local control disabled.

Therefore, the power supply voltage continuously decreases,
When the main controller becomes inoperable, each controlled device can operate, and when the main controller becomes inoperable, the entire system does not go down.

On the other hand, if the power supply voltage drops momentarily,
It is possible to return to the state in which the controlled device controls the controlled device again, and systematic control can be performed.

[Brief description of drawings]

FIG. 1 is a schematic configuration block diagram of a centralized control device according to an embodiment.

FIG. 2 is a schematic configuration block diagram of a main controller.

FIG. 3 is a schematic block diagram of a communication adapter.

FIG. 4 is an operation flowchart of the embodiment.

FIG. 5 is a diagram for explaining the operation in the embodiment.

[Explanation of symbols]

1 heating and cooling system 2 main controller 2 _-1 controller unit _2-2 display unit 2 _-3 printer 3 _-1 to 3 _-3 communication adapter 4 sub-controller 5 receiving section 6 _-1 to 6 _-3 indoor unit 7 wireless remote controller 10 CPU 11 ROM 12 Nonvolatile RAM 13 Interface Unit 20 Indoor Unit 21 Outdoor Unit Controller 22 Outdoor Unit 23 Outdoor Unit 24 Indoor / Outdoor Unit Set 25 Remote Controller 26 Indoor / Outdoor Unit Set 30 RAM 31 Nonvolatile RAM 32 ROM 33 Communication Control Board 34 Control Board 35 interface unit 36 voltage detection unit 37 an input operation unit LM main communication line _{LS 1, LS 21, LS 22} , LS 3 sub communication line PW power UG the control unit group U ₁ ~U _n controlled device V _ref1 first reference Voltage V _ref2 Second reference voltage V Detection voltage V _RST Reset voltage

Claims (2)

(57) [Claims] 1. A plurality of controlled devices, and a main control device that is connected to a power source of a system different from the plurality of controlled devices and that controls the plurality of controlled devices via a communication line. In the central control device, the main control device detects a voltage of the power supply and outputs a voltage detection signal, and the voltage of the power supply is below a predetermined voltage based on the voltage detection signal. And a prohibition canceling means for outputting a local control permission signal for enabling local control to the controlled device at least when the local control is in a prohibited state via the communication line. Central control device. 2. A plurality of controlled devices, and a main control device which is connected to a power source of a system different from the plurality of controlled devices and which controls the plurality of controlled devices via a communication line.
In the centralized control device, the main control device detects a voltage of the power supply and outputs a voltage detection signal, and a voltage of the power supply is first based on the voltage detection signal. Prohibition releasing means for outputting, through the communication line, a local control permission signal enabling local control to at least the controlled device in which the local control is prohibited at least when the voltage becomes lower than the voltage; When the voltage of the power source becomes equal to or higher than the second voltage higher than the first voltage after the signal output, at least the local control prohibition signal is sent to the controlled device to be set to the local control prohibition state through the communication line. A centralized control device comprising: a prohibition setting unit that outputs via a terminal.