JPH06341693A - Electrical circuit for air conditioner - Google Patents

Abstract

PURPOSE:To prevent inoperativeness of an air conditioner due to a troubled micro-computer or its erroneous operation by a method wherein when protection devices for the conditioner are operated, its power source is directly turned off by an operation circuit so as to stop the operation of the air conditioner. CONSTITUTION:Protection devices 1 to 3 are connected in series with each other. Upon energization of any of the protection devices 1 to 3, a current of main circuit of each of the protection circuits is shut off and a current in a relay coil 7-1 within the main circuit is also shut off. In the case that each of the protection circuits 1 to 3 is operated, photo-couplers 4 to 6 connected to each of the protection circuits 1 to 3 detect operation of the protection circuits 1 to 3 and then the operation of the protection devices 1 to 3 is displayed for every classification of the protection devices. In turn, a relay contact point 7-2 is opened by a shut-off relay coil 7-1, a current in a solenoid contact coil 8-1 is shut off and a compressor is stopped. With such an arrangement as above, it is possible to prevent inoperation or erroneous operation caused by a troubled micro-computer.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electric circuit of an air conditioner.

[0002]

2. Description of the Related Art In a conventional device, a plurality of protective devices and a relay interrupted by the operation of the protective device are connected in series on an operation circuit, and if any of the protective devices operates, electromagnetic contact is made via a microcomputer. The air conditioner is stopped by shutting off the electric current of the air conditioner. On the other hand, since it is unclear which protection device has operated, the cause of the stop cannot be known and the service cannot be performed promptly. Therefore, Japanese Patent Application Laid-Open No. 63-318442 discloses a method of discriminating and displaying the type of the protective device that has been actuated based on the difference in the operation time of automatic recovery of the protective device.

[0003]

However, the above-mentioned method has a problem that it cannot be stopped or restored due to a failure of the microcomputer. Further, there is a drawback that the type of the protection device cannot be discriminated between the protection devices having a small difference in the operating time when the type of the protective device is determined by the difference in the operating time of the automatic recovery of the protective device.

The object of the present invention is not to perform the same processing for the means for surely interrupting the current of the electromagnetic contactor and stopping the air conditioner, and for the operation of any protective device, and is of high importance. Means to preferentially process the protective device and which protective device was the cause of the stop,
It is to provide a means that can be displayed clearly.

[0005]

The feature of the present invention is that the stop and restoration processing of the air conditioner by the operation of the protection device of the air conditioner is not performed through the microcomputer but directly on the operation circuit. Further, depending on the degree of importance of the protection device, a circuit for connecting the protection devices in parallel is provided so as to perform the processing separately for notifying only the abnormality and for immediately stopping the air conditioner. In addition, one detector is provided for each protection device, and a circuit for individually converting the operation of the protection device into a signal and sending the signal to a microcomputer for processing such as display is provided.

[0006]

Since the microcomputer is not used for stopping and restoring by the operation of the protective device, the malfunction or malfunction due to the failure of the microcomputer can be prevented.

By connecting the protective devices in parallel, individual circuits can be formed, and the highly important protective devices can immediately stop the air conditioner as well as display an abnormality.

By providing each detector and sending a signal according to the type of the protective device, the microcomputer can judge the signal and the abnormality due to the operation of which protective device can be clearly judged.

[0009]

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

(First Embodiment) As shown in FIG. 1, the electric circuit of the air conditioner in this embodiment has protective devices 1, 2, 3
The photocouplers 4, 5 and 6 are connected to the circuit constituted by the relay coil 7-1. Also, relay contact 7
The -2 circuit includes an electromagnetic contactor contact 8-2 for operating and stopping the compressor, an electromagnetic contactor coil 8-1, a push button switch 10 for operation, and a main switch 9.

The protection devices 1, 2 and 3 are connected in series,
When any of the protective devices operates, the current of this circuit is cut off, and the current of the relay coil 7-1 in the circuit is also cut off. A photocoupler 4 is connected to the protective device 1, a photocoupler 5 is connected to the protective device 2, and a photocoupler 6 is connected to the protective device 3. When each protective device is activated, each connected photocoupler detects the operation of the protective device. Send a signal to the microcomputer. The microcomputer to which the signal is sent discriminates which protection device is operating and displays it according to the type of protection device.

On the other hand, the relay contact 7-2 opens from the interrupted relay coil 7-1, and the electromagnetic contactor coil 8-1.
Current is cut off and the compressor stops. Furthermore, since this circuit is also a self-holding circuit, when restarting the operation, after the protective device is restored and the relay contact 7-2 is closed,
The operation is not performed unless the push button switch 10 is pressed and the electromagnetic contactor contact 8-2 is closed.

(Second Embodiment) In the first embodiment, when the operation processing of the protection device is of great importance, the protection devices 1, 2 and 3 are connected in parallel as shown in FIG. As in the first embodiment, the protection devices 1, 2 and 3 are provided with photo couplers 4, 4.
5 and 6 are connected to each other and a signal is sent to the microcomputer for each type of protection device.

The protection devices 1 and 2 connected in parallel do not need to stop the compressor immediately, but when the protection devices are activated, the photo couplers 4, 5 respectively connected thereto are connected.
Informs the microcomputer of the operation of the protection device, and the microcomputer determines whether the compressor is stopped. Further, since the protection device 3 is required to immediately stop the compressor unconditionally, the stop of the compressor is not based on the judgment of the microcomputer. Shut off the current of
Stop the compressor. Further, when the overcurrent breaker 11 is activated, the photocoupler 12 detects and stops the compressor. If no current is flowing through the circuit, photo coupler 1
3 detects.

[0015]

According to the present invention, in addition to detecting the operation of the protective device, the electromagnetic contactor can be directly shut off and the air conditioner can be immediately stopped to enhance the safety, in the case of the highly important protective device. It will be possible.

Further, the operation can be displayed according to the type of the protection device, and the service can be performed quickly.

[Brief description of drawings]

FIG. 1 is an electric circuit diagram of an air conditioner according to an embodiment of the present invention.

FIG. 2 is an electric circuit diagram of the air conditioner of the second embodiment of the present invention.

[Explanation of symbols]

1, 2, 3, ... Protecting device, 4, 5, 6, 12, 13, 13 ... Photo coupler, 7-1 ... Relay coil, 7-2 ... Relay contact,
8-1 ... Electromagnetic contactor coil, 8-2 ... Electromagnetic contactor contact,
9 ... Main switch, 10 ... Push button switch.

Claims (1)

[Claims] 1. A method for stopping the air conditioner when the protection device for the air conditioner is activated, wherein the operation of the protection device is temporarily taken into a microcomputer and is not processed, and the power is directly supplied by a direct operation circuit. An electric circuit of an air conditioner, characterized in that it is cut off to stop the operation of the air conditioner.