JPH0571785A - Failure diagnosis device - Google Patents

Abstract

PURPOSE:To correctly estimate the cause of failure. CONSTITUTION:An alarm detecting unit 3 detects an alarm signal from a multichamber type air conditioning system 7. An operation condition storing unit 4 stores operation conditions of each unit at the system 7 when an alarm is detected. A stop means 22 stops the system 7 when the number of alarm detections by means of a count means 21 has reached a predetermined number 'Nx'. An operation condition corresponding to an item indicated by a display item indicating unit 5 based on an operation condition of each unit at the occurrence of failure stored in an operation condition storing unit 4 is displayed on a display unit 6 when cause of failure is investigated. In this manner, cause of failure can be correctly estimated based on the operation condition when a failure has occurred.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an improvement of a failure diagnosis device used for a failure diagnosis of a multi-room air conditioner or the like.

[0002]

2. Description of the Related Art Conventionally, as a failure diagnosing device used in a multi-room air conditioner, when investigating the cause of a failure, a switch is operated to digitally display operating conditions such as temperature of each part at the time of investigating the cause. There is something. The service engineer can estimate the cause of the failure from the digitally displayed operating condition.

[0003]

However, in the above-mentioned conventional failure diagnosis apparatus, since the operating state at the time of investigating the cause of the failure is digitally displayed, the operating state of each part at the time of failure cannot be reproduced. In many cases. Therefore, the conventional failure diagnosis device as described above has a problem that the cause of the failure cannot be accurately estimated in the case of a failure having poor reproducibility.

SUMMARY OF THE INVENTION An object of the present invention is to provide a failure diagnosing device capable of accurately estimating the cause of failure based on the operating state of each part when a failure occurs.

[0005]

In order to achieve the above object, the failure diagnosis apparatus of the present invention has a structure as shown in FIG.
An alarm detection unit 3 that detects an alarm signal from the failure diagnosis target system 7, and the operation of each unit in the failure diagnosis target system 7 at the time when the alarm detection unit 3 detects the alarm signal from the failure diagnosis target system 7. The operation state storage unit 4 that stores the state, the count unit 21 that counts the number of times the alarm detection unit 3 detects an alarm signal related to the same cause, and the number of times the alarm signal detected by the count unit 21 is detected is a predetermined number of times. In the case of the above, the stop means 22 that sends a stop signal to the failure diagnosis target system 7 to stop the failure diagnosis target system 7, and a display unit that displays the operating state stored in the operating state storage unit 4 6 and a display item designating section 5 for designating an item of the operating state to be displayed on the display section 6 There.

[0006]

When the alarm signal from the failure diagnosis target system 7 is detected by the alarm detection unit 3, the operating state of each part in the failure diagnosis target system 7 at the time when the alarm detection unit 3 detects the alarm signal. Are stored in the operating state storage unit 4. Further, the counting means 21
Thus, the number of times the alarm detection unit 3 detects an alarm signal related to the same cause is counted. When the number of detections of the alarm signal counted by the counting means 21 reaches a predetermined number, a stop signal is sent to the failure diagnosis target system 7 by the stopping means 22 to stop the failure diagnosis target system 7. To be done.

On the other hand, when investigating the cause of the failure of the system 7 to be diagnosed, the display item designating section 5 designates the item of the operating state to be displayed. Then, among the operation states of the respective parts in the failure diagnosis target system 7 at the time of alarm detection stored in the operation state storage unit 4, the operation state corresponding to the item designated by the display item designation unit 5 is the above-mentioned. It is displayed on the display unit 6. In this way, the cause of failure of the failure diagnosis target system 7 is investigated based on the operating states of the respective parts in the failure diagnosis target system 7 at the time when the failure diagnosis target system 7 issues an alarm signal.

[0008]

The present invention will be described in detail below with reference to the embodiments shown in the drawings. FIG. 1 is a block diagram when the failure diagnosis apparatus in this embodiment is used in a multi-room air conditioner. The alarm detection unit 3 in the failure diagnosis device 1 constantly monitors the multi-room air conditioning system 7 to detect an alarm signal sent from the multi-room air conditioning system 7. When the alarm detection unit 3 detects an alarm signal from the multi-room air conditioning system 7, the operation state storage unit 4 stores in the operation state of each unit in the multi-room air conditioning system 7 at that time (for example, compression Machine discharge pipe temperature, heat exchanger temperature, etc.) are stored.

On the other hand, when the service person investigates the cause of the failure of the multi-room air conditioning system 7, the display item designating section 5 designates the display item to be displayed on the display section 6. Then, the operating condition storage unit 4 is displayed on the display unit 6.
The operating state at the time of alarm occurrence corresponding to the above-mentioned designated display item stored in is displayed. In this way, the cause of the failure in the multi-room air conditioning system 7 is estimated based on the operating states of the respective parts when the alarm is displayed, which is displayed on the display part 6. The failure diagnosis control unit 2 controls the alarm detection unit 3, the operation state storage unit 4, the display item designation unit 5 and the display unit 6 to control the multi-room air conditioning system 7
The failure diagnosing operation is performed for the multi-chamber air conditioning system 7 and a stop signal is output as necessary to stop the multi-room air conditioning system 7.

FIG. 2 is a flow chart of a failure diagnosis processing operation for the multi-room air conditioning system 7 which is executed by the failure diagnosis control unit 2. The failure diagnosis processing operation will be described below with reference to FIG. In step S1, the content of the alarm detection count n is initialized to "0". In step S2, it is determined whether the alarm detection unit 3 has detected an alarm signal. If it is detected as a result, the process proceeds to step S3, and if not, the process waits until an alarm signal is detected.

In step S3, it is determined whether or not the number of alarm detections n is "0" (that is, whether the alarm detection is the first time). If the result is "0", the process proceeds to step S4, and if not "0", step S4 is skipped. In step S4, the operating state storage unit 4 stores the operating state of each unit such as the discharge pipe temperature of the compressor and the heat exchanger temperature in the multi-room air conditioning system 7. In step S5, the content of the alarm detection number n is incremented and the number of trouble occurrences is counted.

In step S6, it is determined whether or not the number of alarm detections n is a predetermined value "n _x " or more. If the result is "n _X " or more, it proceeds to step S8, and if it is smaller than "n _X ", it proceeds to step S7. In step S7, the rotation frequency of the compressor, the motor-operated valve opening degree, the fan tap, and the like are reset to initial values according to the load on the indoor unit side in the multi-room air conditioning system 7. Then, the process returns to step S2 to check again whether the alarm signal is detected. In step S8, the alarm signal is detected even if the above-mentioned values are reset to the initial values and the operation is repeated a predetermined number of times "n _X ", so it is determined that the above-mentioned malfunction is true, and the multi-room air conditioning system is determined. 7 is stopped to complete the failure diagnosis processing operation.

As described above, when the failure diagnosis control section 2 carries out the failure diagnosis processing operation and the multi-room air conditioning system 7 is stopped, the cause of failure is investigated by the service person. First, by operating the switches RS1 and RS2 provided on the display panel of the outdoor unit of the multi-room air conditioning system 7 as shown in FIG. It is displayed on the display unit 6.

At this time, the operating states of the respective parts displayed on the display section 6 are the operating states of the respective parts stored in the operating state storage section 4 in step S4 in the flowchart of the failure diagnosis processing operation. Therefore, in this embodiment, even when investigating the cause of a failure, it is possible to know the operating state of each part when a failure occurs.

FIG. 4 shows a list of display items displayed on the display unit 6, including the set value of the switch RS1 and the switch RS2.
The display item is determined by the combination with the setting value of. In FIG. 4, the horizontal column shows the set value of the switch RS1, while the vertical column shows the set value of the switch RS2, and the display section 6 displays the intersection of the set value of the switch RS1 and the set value of the switch RS2. Displayed items are described. That is, the combination of the set value of the switch RS1 and the set value of the switch RS2 is (switch RS1
And the setting value of the switch RS2), for example,
In the case of (0, 0), the content of the abnormality is displayed on the display unit 6 by a code.

Next, for example, when the switch RS1 is switched to (1, 0), the value of the output frequency of the inverter is digitally displayed. Next, for example, when the switch RS1 and the switch RS2 are switched to (F, 1), the piping / wiring connection error connecting the outdoor unit and the indoor unit of the room A in the multi-room air conditioning system 7 is incorrect. Whether or not is displayed by the code. Hereinafter, in the same manner, the operating state at the time of occurrence of a failure selected by the switch RS1 and the switch RS2 is displayed on the display unit 6. That is, the switch RS1 and the switch RS2 constitute the display item designation section 5.

Details of the abbreviations used in FIG. 4 are as follows. D _OT : Discharge pipe temperature D _CB1 : Outdoor heat exchanger temperature DE: Refrigerant saturated vapor temperature D _EA : Refrigerant temperature before accumulator D _DB2 : Outdoor high pressure equivalent saturated vapor temperature Outdoor mode: Heating / cooling mode D _OA : Outdoor air temperature EV: each room electric expansion valve D _G1 to D _G7: the chambers of the indoor heat exchanger immediately before / after the gas refrigerant temperature D _L1 to D _L7: each chamber of the indoor heat exchanger immediately before / after the liquid refrigerant temperature D _{C1 to} D _C7 : Condensing temperature of the indoor heat exchanger in each room D _{A1 to} D _A7 : Evaporating temperature of the indoor heat exchanger in each room EV ₀ : Motorized valve for superheat control

When frequency, current, temperature, or opening is selected as the display item, the display unit 6 displays the values of frequency, current, temperature, angle, etc. as they are in three-digit numbers. It When "relay output" is selected as the display item, each digit of the display unit 6 displays the output state of one relay, and when the relay is "on", "1" is displayed. On the other hand, if "OFF", "0" is displayed. Furthermore, when another display item is selected, a code corresponding to the display content of the display item is displayed.

Next, an example of the display on the display section 6 will be described in detail together with the estimated cause of failure. Figure 5
An example of failure diagnosis by the failure diagnosis device 1 in the present embodiment will be shown. In FIG. 5, the set values of the switches RS1 and RS2, the display items on the display unit 6, the display contents of the display unit 6 and the probable cause are displayed for each abnormality content. That is, FIG. 5 (a) is a failure diagnosis example in "overload operation stop", FIG. 5 (b) is a failure diagnosis example in "output overcurrent stop", and FIG. 5 (c) is "indoor heat exchange". It is an example of failure diagnosis in "temperature abnormality".

First, the combination of the switch RS1 and the switch RS2 is set to (0, 0) and the display item "abnormality content" is selected. Then, when the abnormality content code “E5” is displayed on the display unit 6 as shown in FIG. 5A, it is understood that the abnormality content is “overload operation stop”.
Further, when the abnormality content code "L5" is displayed as shown in FIG. 5B, the abnormality content is "output overcurrent stop", and the abnormality content code "A5" is as shown in FIG. 5C. If it is displayed, it can be understood that the abnormality content is "indoor heat exchange temperature abnormality".

After that, another display item corresponding to the obtained abnormality content is selected and displayed by the switches RS1 and RS2, and the cause of the failure may be estimated from the displayed content. Hereinafter, "stopping the overload operation" will be described with reference to FIGS. For example, the combination of the switch RS1 and the switch RS2 is set to (3,0) and the display item "D _OT : discharge pipe temperature" is selected. In that case, the discharge pipe temperature “137” is displayed on the display unit 6.
If C is displayed, the cause of the failure can be inferred if the discharge temperature of the compressor in the multi-room air conditioning system 7 is abnormally increased.

Further, the switch RS1 and the switch RS2
When the display item "DE: Saturated steam temperature of refrigerant" is selected by setting the combination of (5, 0) and the low pressure equivalent saturated steam temperature "5" ° C is displayed on the display unit 6. Furthermore, the combination of switch RS1 and switch RS2
When the display item "D _EA : Refrigerant temperature before accumulator" is set to (6, 0) and the accumulator inflow refrigerant temperature "-3" ° C is displayed on the display unit 6. Then, from these two display contents, for example, a thermistor for detecting saturated vapor temperature provided in the pipe between the receiver and the accumulator inlet in the multi-room air conditioning system 7, and the accumulator provided in the accumulator inflow pipe. The cause of the failure is presumed to be due to a misplacement with the thermistor for detecting the inflowing refrigerant temperature.

Further, the combination of the switch RS1 and the switch RS2 is set to (F, 1) and the display item "wrong pipe A room" is selected. In this case, if the display unit 6 displays the incorrect piping code "P", the piping related to room A /
The wiring is presumed to be normal. Also, the switch R
When the combination of S1 and switch RS2 is set to (F, 2) and the display item "wrong piping B room" is selected, it is assumed that the wrong piping code "E" is displayed on the display unit 6. Similarly, the combination of switch RS1 and switch RS2
It is assumed that the wrong piping code "E" is displayed on the display unit 6 when the display item "wrong piping C room" is set to (F, 3). Then, regarding Room B and Room C, it is presumed to be incorrect piping / miswiring.

The combination of the switch RS1 and the switch RS2 is set to (1, C) and the display item "relay output" is selected. In that case, it is assumed that the display unit 6 displays the relay on / off code “000”. In this case, when the combination of the switches RS1 and RS2 is set to (1, C), the first digit of the three-digit number string displayed on the display unit 6 represents ON / OFF of the four-way valve relay. Is set in advance. Therefore, the relay on / off code represents that the four-way valve relay is non-conductive. That is, the cause of the failure is presumed to be a defective coil of the four-way valve relay. Hereinafter, similarly, the display item is switched by the switching setting of the switch RS1 and the switch RS2, and the cause of the failure is estimated by the display content of the display unit 6.

In the case of the abnormality content "output overcurrent stop" and the abnormality content "indoor heat exchange temperature abnormality", the cause of failure is presumed in exactly the same manner.

As described above, in the present embodiment, when a malfunction occurs, the operating conditions (rotation frequency, temperature (Opening degree, positive / abnormal, etc.) are stored in the operating state storage unit 4. Then, the rotation frequency of the compressor, the motor-operated valve opening degree, the fan tap, and the like are reset to initial values according to the load on the indoor unit side. Thus alarm detection
The multi-room air conditioning system 7 is stopped only when the alarm signal is detected even if the reset operation is repeated a predetermined number of times "n _x ". Therefore, the multi-chamber air conditioning system can be stopped only when a reliable failure that is repeated several times occurs instead of a transient failure caused by disturbance or the like, and the reliability of failure diagnosis can be improved.

Further, at the time of investigating the cause, the set values of the switch RS1 and the switch RS2 are selected from the operating states of the respective parts in the multi-room air conditioning system 7 at the time of occurrence of failure, which are stored in the operating state storage section 4. The operating state of the display item designated by the combination of is read and displayed on the display unit 6. In this way, the service person can directly refer to the operating state at the time of failure occurrence, not the operating state of each part at the time of investigating the cause.
Therefore, even a cause of failure with poor reproducibility can be easily found.

In the above embodiment, there is only one predetermined value "n _X " which is used as a criterion for determining the stop of the multi-room air conditioning system. However, the present invention is not limited to this. For example, a plurality of the above-mentioned predetermined values may be provided for each failure content, and the determination standard when determining whether to stop the multi-room air conditioning system may be changed according to the failure content.

Further, although the display item designating section 5 in the above embodiment is composed of two switches, the switch RS1 and the switch RS2, the present invention is not limited to this.

Further, in the above embodiment, the case where the failure diagnosis device 1 of the present invention is used for the failure diagnosis of the multi-room air conditioning system is described as an example. However, the failure diagnosis device 1 may be used for failure diagnosis of other systems.

[0031]

As is apparent from the above, the fault diagnosis apparatus of the present invention detects the alarm signal from the fault diagnosis target system by the alarm detection unit, and the operating state of each unit in the fault diagnosis target system at the time of alarm detection. Is stored in the operating state storage unit, and when the number of alarm signal detections counted by the counting unit reaches a predetermined value, the stop unit outputs a stop signal to stop the failure diagnosis target system. The failure diagnosis target system can be stopped only when a reliable failure that is repeated several times occurs instead of a temporary failure. Therefore, according to the present invention, the reliability of failure diagnosis can be improved.

During the cause investigation, the operating state of each part in the fault diagnosis target system at the time of alarm detection is displayed on the display part according to the item designated by the display item designating part. Instead, the cause investigation can be carried out directly based on the operating state at the time of failure occurrence. Therefore, according to the present invention, even a cause of a failure with poor reproducibility can be easily found.

[Brief description of drawings]

FIG. 1 is a block diagram showing an embodiment in which the failure diagnosis device of the present invention is used in a multi-room air conditioner.

FIG. 2 is a flowchart of a failure diagnosis processing operation performed by the failure diagnosis device in FIG.

FIG. 3 is a diagram showing a display panel provided with switches and a display unit.

FIG. 4 is a diagram showing an example of display items.

5 is a diagram showing an example of failure diagnosis by the failure diagnosis device shown in FIG.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Failure diagnosis device, 2 ... Failure diagnosis control part, 3 ... Alarm detection part, 4 ... Operating state storage part, 5 ... Display item designation part, 6 ... Display part, 21 ... Counting means, 22 ... Stopping means.

Claims (1)

[Claims] 1. An alarm detection unit (3) for detecting an alarm signal from a fault diagnosis target system (7), and the alarm detection unit (3) is the fault diagnosis target system.
The same cause by the operation state storage unit (4) that stores the operation state of each unit in the failure diagnosis target system (7) at the time of detecting the alarm signal from (7) and the same cause by the alarm detection unit (3) Counting means (21) for counting the number of detections of the alarm signal, and a stop signal to the failure diagnosis target system (7) when the number of detections of the alarm signal counted by the counting means (21) reaches a predetermined number. To stop the failure diagnosis target system (7) by sending a message, a display unit (6) for displaying the operating state stored in the operating state storage unit (4), and the display unit (6). A fault diagnosis device comprising a display item designation section (5) for designating an item of an operating state to be displayed in 6).