JPS6317338A - Operation protecting device for air-conditioning machine - Google Patents

Abstract

PURPOSE:To permit the stop of operation as well as the indication of an abnormality, by a method wherein the protecting operation of an air-conditioning machine is effected based on the output of a receiving means, which receives an information on the abnormality from a receiving abnormality transmitting means. CONSTITUTION:When an indoor micro-computer 15 is started, signals to be transmitted to an outdoor unit 2 are assembled and it is decided whether a signal from the outdoor unit is received or not. When a signal does not come for a given period of time or in a case, in which the length of a bit is wrong, it is decided that an abnormality is occurred. When it is normal, it is decided whether the outdoor units is causing a receiving abnormality or not. When it is decided that an abnormality present, an electric source main relay 17 is disenergized, the contact 17a thereof is opened and the operation of an air-conditioning machine is stopped in order to prevent the abnormal operation of the air-conditioning machine. An outdoor micro-computer 19 is treated in the same manner and when it is decided that an abnormality present, a bit for abnormal receiving is put ON and is transmitted into the indoor unit 1. An indicating lamp 23 for abnormal stopping is provided whereby the cause of the abnormality may be indicated clearly.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention provides an air conditioner in which operating information is exchanged between an indoor unit and an outdoor unit via a communication means, when a reception error occurs. The present invention relates to an air conditioner operation protection device that prevents abnormal operation of the air conditioner.

[Conventional technology]

FIG. 5 is a block diagram showing a conventional communication system between indoor and outdoor units disclosed in, for example, Japanese Unexamined Patent Publication No. 59-46439. In the figure, l is an indoor unit,
An indoor control microcomputer (hereinafter referred to as an indoor microcomputer) 3, a transmitting/receiving circuit 4 connected thereto, and a thermistor 5 for room temperature control connected to the indoor microcomputer 8.
It is equipped with In addition, 2 is an outdoor unit, a microcomputer for outdoor control (hereinafter referred to as an outdoor microcomputer) 6
, and a transmitting/receiving circuit 7 connected thereto, and the indoor transmitting/receiving circuit 4 and the outdoor transmitting/receiving circuit 7 are connected by a serial signal line 8. 9 is a compressor controlled by the outdoor microcomputer 6.

Next, the operation will be explained.

The indoor microcomputer 3 compares the temperature detected by the room temperature thermistor 5 with a preset room temperature, and turns on the compressor 9 if the temperature is below the set temperature or abnormal.
Or, it is determined whether to turn it off or not, and a serial signal is assembled by the program of the indoor microcomputer 3. This serial signal is sent out through the indoor transmitting/receiving circuit 4 through a serial signal line 81. The serial signal sent outdoors through the signal line 8 is received by the outdoor transmitter/receiver circuit 7, analyzed by the program of the outdoor microcomputer 6, and turns on the compressor 9.
Or make it F.

[Problem that the invention seeks to solve]

Conventional internal/external communication devices are configured as described above, so if the serial signal cannot be received correctly, the air conditioner may malfunction, and it is not possible to determine the cause of the malfunction. There were problems such as the inability to protect the air conditioner from abnormal operation.

This invention was made in order to solve the above-mentioned problems, and provides an operation protection device for an air conditioner that can stop operation or display an abnormality display to protect the operation when there is an abnormality in signal reception. The purpose is to obtain.

[Means for solving problems]

In the operation protection device for an air conditioner according to the present invention, the operation signal receiving means of the outdoor unit is provided with a means for determining a signal reception abnormality and a signal transmission means for indicating that abnormal reception has been received, and further, the indoor unit is provided with a signal transmission means for transmitting a signal to the outdoor unit. The apparatus is provided with means for transmitting operation signals and receiving abnormalities in reception from the outdoor unit, and also provided with operation protection operation means.

[Effect]

In this invention, when the reception abnormality receiving means determines that a reception abnormality has occurred in the operating information transmitted from the indoor unit to the outdoor unit through the transmission and reception means, the abnormality determination result is transmitted to the indoor unit through the transmission and reception means, The operation protection means will be activated, stopping the operation of the air conditioner and displaying the abnormal stoppage. This prevents the air conditioner from operating abnormally during a reception error.

〔Example〕

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 is a diagram showing the basic structure of an air conditioner operation protection device according to the present invention. A means 10 for assembling an operation signal and transmitting the signal based on input signals from the indoor temperature sensor 5, etc.
Sends the signal serially. Then, the above serial signal is received by the operation signal receiving means 11 on the outdoor side.
Analyze to determine whether the signal was received correctly. In the case of an abnormality, the reception abnormality transmitting means 12 transmits abnormality information to the reception abnormality receiving means 13 on the indoor unit side,
Distinguishing the abnormal signal signal by the reception abnormality means 13 in the room,
The operation protection operation means 14 performs the protection operation.

FIG. 2 is an electric circuit block diagram showing a specific embodiment based on the principle configuration shown in FIG. 1 above. In the figure, l is an indoor unit, and this indoor unit 1 is equipped with an indoor microcomputer 15, an indoor temperature sensor 5 connected to this, and a transmitting/receiving circuit 16, and a main unit for operation protection connected to the indoor microcomputer 15. It has a power supply relay 17, and this contact 1
7a is the commercial power AC of indoor unit 1 and outdoor unit 2
It is connected in series to a power supply line 18 connecting the two.

Further, in the outdoor unit 2, the contact 21a of the outdoor microcomputer 1921 is connected in series to the power supply circuit of the compressor 9, and the transmitting/receiving circuits 16 and 20 are further connected by a signal line 22.

In FIG. 2, the indoor microcomputer 15 and the transmitting/receiving circuit 16 correspond to the operating signal transmitting means 10 and the reception abnormality receiving means 13 in FIG. The receiving means 11 corresponds to the operation signal receiving means 11 and the abnormal reception transmission operation 12 in FIG. 1, and the relay 17 corresponds to the operation protection means 14 in FIG.

Next, the operation of the above embodiment will be explained based on the flowcharts of FIGS. 3(a) and 3(b). FIG. 3+al is a flowchart showing the processing procedure of the indoor microcomputer.

First, when the indoor microcomputer 15 starts, step 4
In step 1, a signal to be transmitted to the outdoor unit 2 is assembled, and in the next step 42, the signal transmission processing is executed. Then, in the next step 43, a signal reception process from the outdoor unit is performed, and in step 44, it is determined whether the signal has been received. Here, a case where no signal is received for a certain period of time, an error in the bead/node length, etc. are determined to be abnormal.

In step 45, if normal, it is determined whether the outdoor unit has caused a reception abnormality based on the presence or absence of a determination bit in the received bit string, and if normal, the process returns to the beginning. If it is determined that there is an abnormality in steps 44 and 45, the process proceeds to step 46, in which the main power relay 17 is deenergized and its contacts 17a are opened to prevent the air conditioner from operating abnormally. Stop the machine's operation.

FIG. 3 fb) is a flowchart showing the processing procedure of the outdoor microcomputer 19. First, in step 51, a signal reception process from the indoor unit 1 is performed, and it is determined in step 52 whether a signal has been received. Here, as in the case of the indoor unit, a case where no signal is received for a certain period of time, an error in the via length, etc. are determined to be abnormal. If normal, a signal to be transmitted to the indoor unit is assembled in step 53, and the signal is transmitted in step 54, and the process returns to the beginning. If it is determined that there is an abnormality in step 52,
Turn on the error reception bit and transmit to the indoor unit 1.

In addition, in the above embodiment, the operation was stopped in the event of an abnormality, but in order to clarify the cause of the stoppage,
As shown in FIG. 4, an indicator light 23 for abnormal stop is provided, and the cause of the abnormality can be clearly indicated by lighting or blinking the indicator light 23. Step 47 in FIG. 3(a) shows this state. In addition, the indicator light 23 does not need to be specially provided for abnormal stop, and may blink an existing indicator light connected to the output port of the microcomputer, or may sound a buzzer or the like.

〔Effect of the invention〕

As described above, according to the present invention, when an abnormality occurs in signal reception, the air conditioner is stopped or the cause is displayed, so abnormal operation can be prevented. Moreover, if all the operations are performed by a program, no special additional parts are required, and the device can be manufactured at low cost.

[Brief explanation of the drawing]

Figure 1 is a program diagram showing the basic configuration of this invention.
FIG. 2 is a process diagram showing an embodiment of the present invention, FIG. 3(a) is a flowchart showing the processing procedure of the indoor unit, FIG. The figure is a block diagram showing another embodiment of the present invention, and Fig. 5 is a block diagram of a conventional example. 1... Indoor unit, 2... Outdoor unit, 5...
- Indoor temperature sensor, 9... Compressor, 10... Operating signal transmitting means, 11... Operating signal receiving means, 12...
Reception abnormality transmitting means, 13... Reception abnormality receiving means, 1
4... Driving protection means, 15... Indoor microcomputer, 16
．． 20... Transmission/reception circuit, 17... Relay, 19...
・Outdoor microcomputer. Note that the same reference numerals in the figures indicate the same or equivalent parts. Representative Masa Ookun (and 2 others) Fig. 1 1...Indoor unit 2...Outdoor unit 5...Indoor temperature sensor Fig. 5

Claims (3)

[Claims] (1) An operation signal transmitting means for transmitting an operation signal according to indoor temperature information, an operation receiving means for receiving an operation signal from this transmitting means and controlling an outdoor unit, and an operation signal transmitting means for controlling an outdoor unit by receiving an operation signal from this transmitting means; A receiving abnormality transmitting means that performs control and transmits the abnormality to the indoor unit; a receiving means located on the indoor unit side that receives abnormality information from the receiving abnormality transmitting means; A control device for an air conditioner, comprising an operation protection means for operating the conditioner in a protective manner. (2) The operation protection device for an air conditioner according to claim 1, wherein the air conditioner is stopped when a reception error occurs and the operation protection means is activated. (3) The operation protection device for an air conditioner according to claim 1, wherein when a reception error occurs and the operation protection means is activated, an abnormal stop is displayed.