JP2002081809A - Cold remote monitoring device with trouble diagnosis function - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a cold remote monitoring device to automate analysis of a trouble cause during the occurrence of a trouble to a cold heat apparatus and report both the degree of modulation and the cause of modulation. SOLUTION: The analogue values of operation data measured by sensors 9, 10, 11, 12, 13, 14, 15, and 16 are transmitted to an A/D conversion device 2 and converted into a digital value, which is sent to and stored in a managing device 33. In the managing device 33, a detecting condition is previously set regarding a contained operation data item. In the managing device 33, a preset reference value is compared in magnitude with collected operation data. Modulation is recognized and it is detected whether the modulation is light or heavy and further a modulation cause is analyzed and disposed. When abnormality or modulation is detected, the degree of modulation combined with a modulation cause is reported from a transmission reception device 5 to a monitoring device 20 at the terminal of a business and from a transmission reception device 4 through a communication circuit.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cooling / heating remote monitoring apparatus having a failure diagnosis function for notifying the occurrence of modulation of a cooling / heating apparatus, analyzing the cause of the modulation and notifying the cause of the modulation.

[0002]

2. Description of the Related Art Heretofore, a refrigeration equipment remote monitoring device for refrigeration equipment such as refrigeration / air conditioning equipment has remotely monitored collected operation data of refrigeration equipment. FIG. 19 and FIG. 20 show the outline and operation of a conventional cold remote monitoring device.

As shown in FIG. 19, for example, in a conventional remote monitoring device for cooling equipment, a sensor 1 is installed for an air conditioner 7 to be monitored, and the temperature, pressure, voltage,
Detects current and contact values. Then, the analog value of the operation data measured by the sensor 1 is transmitted to the A / D converter 2 and converted into a digital value. A / D converter 2
The operation data of the sensor 1 converted into the digital value in is transmitted to the management device 3 via the communication line and stored. The management device 3 performs abnormality / modulation detection processing of the stored operation data, and when abnormality or modulation is detected,
An abnormality or modulation is reported to the business office terminal 6 via the transmission / reception devices 4 and 5.

Next, an abnormality detection process of the management device 3 will be described with reference to FIGS.

First, the operation transmitted from the A / D converter 2 is described.
The transfer data is read (step S100). And different
As the normal detection processing, for example, the contact state of the air conditioner protection device
Is switched from "OFF" to "ON"
Is recognized as an abnormality. On the other hand, the modulation detection process
In addition, the management device 3 stores
Detection conditions are set in advance, and the management device 3
The difference between the preset reference value and the collected operation data
A small comparison is performed to recognize the modulation (steps S102 and S1).
03). Here, in the modulation detection processing, for example,
In the case of the tone control, the detection condition is set to “high pressure> 24.0 kg / cm
²(2.35 × 10^-3Pa) "
The reading from the sensor is 24.1kg / cm²(2.3
6 × 10 ^-3Pa) is detected, high-pressure pressure modulation
recognize. Detection of abnormalities and modulations as described above
To save several operation data before occurrence of abnormality / modulation.
Data in the evacuation area of the management device 3 (step
At the same time, a notification is sent to the office terminal 6 (step S105).
S110). Abnormal or modulated at the office terminal 6
The observer who has confirmed the
Collect evacuation data stored in the management device 3 in the terminal 6
(Step S112). And the observer is the business
Of abnormalities or modulation sent to terminal 6 and evacuation
Estimate the cause of anomalies or modulation based on data
Then, the degree of urgency was determined, and a dispatch instruction was issued.

[0006] The term "modulation" refers to a state in which the value of certain collected operation data deviates from a normal range.

[0007]

However, in the cooling / heating equipment remote monitoring apparatus described above, the modulation detection processing in the management apparatus is performed only by comparing the size of one data item with respect to one event. Did not analyze any correlated data items. For this reason, in the refrigerant circuit of the refrigeration equipment, for example, an air conditioner, it is possible to confirm which part of the operation data value has reached the abnormality or the modulation value, but the cause analysis of the abnormality or the modulation is performed before the abnormality or the modulation occurs in the event. It was necessary for the observer to perform the operation based on the operation data (i.e., the evacuation data).

[0008] In performing this cause analysis, a supervisor having expertise in the cooling and heating business is indispensable.
This analysis takes a lot of time. Further, there is a possibility that the analysis result may not be uniform depending on the technical level of the monitor, and there is also a possibility that erroneous judgment or oversight may be caused.

Further, conventionally, the cause analysis process relative to other operation data has hardly been performed. For this reason, even if the air conditioner is normal, even if the operation data value of the refrigerant circuit of the air conditioner temporarily satisfies the modulation detection condition due to an external factor such as a sudden change in the outside air temperature, the telephone line is disconnected. Since the notification is made via the telephone, there is a problem that the running cost of the remote monitoring device system increases, such as telephone charges.

The present invention has been made in view of the above-mentioned conventional problems, and an object of the present invention is to automate a failure cause analysis when a failure occurs in a refrigeration equipment, thereby providing a remote monitor with high accuracy and high speed for abnormality / modulation. It is an object of the present invention to provide a cold / hot remote monitoring device with a failure diagnosis function that can notify a dispatcher, clarify the dispatch standard, identify the cause early, and reduce the addition of on-site work by an accurate work instruction.

[0011]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, a cooling / heating remote monitoring apparatus with a failure diagnosis function according to the present invention has the following features.

(1) A plurality of sensors attached to a plurality of measurement points of the cooling and heating equipment to measure operation data, and collect and accumulate operation data from the plurality of sensors, perform arithmetic processing, and based on the collected operation data. Perform modulation judgment,
At the time of modulation determination, the degree of modulation is further divided into levels, and a management device for notifying the modulation and also notifying the modulation level information is connected to the management device via a communication line to monitor the modulation notification from the management device. And a monitoring device.

[0013] Since the management apparatus further divides the modulation level into levels at the time of the modulation determination, and reports the modulation and also reports the modulation level information, even if the modulation is of the same item, the urgency at the time of the report is determined by the modulation level. Is clarified, and the criteria for the monitor who receives the notification to issue a dispatch instruction are clarified.

(2) In the cooling / heating remote monitoring device with a failure diagnosis function according to the above (1), the management device further comprises:
The cause of the modulation is analyzed based on the operation data from the plurality of sensors, and the monitoring device is notified of the cause of the modulation together with the notification of the modulation.

Further, the management apparatus automatically analyzes the cause of the occurrence of the modulation relative to other correlated operation data, and notifies the cause of the modulation at the time of the modulation determination. Irrespective of the degree of possession of specialized knowledge, it is possible to obtain a highly accurate cause analysis result, and it is possible to prevent a conventional variation in cause analysis. Further, the result of the cause analysis can be obtained in a short time. Also,
It is also possible to prevent human judgment errors by the monitor as in the conventional case.

(3) In the cold / heat remote monitoring device with a failure diagnosis function according to the above (1) or (2), the management device further stores operation data before and after the occurrence of modulation as evacuation data, Receiving the notification from the management device, collects the evacuation data from the management device according to polling processing.

In contrast to the conventional operation data only before the occurrence of the modulation as the save data, by using the operation data before and after the generation of the modulation as the save data, the storage range of the data for analyzing the modulation is expanded and monitored. The operator can catch more detailed symptoms, and can send a more accurate dispatch instruction to a site worker.

(4) In the cold remote monitoring device with a failure diagnosis function according to any one of the above (1) to (3), the management device is arranged on the site where the cold device is installed. It is characterized by.

A management device is placed at each site where each cooling / heating device is installed, and a large-scale management device is placed at a monitoring center in order to constantly analyze the modulation level and the modulation generation cause of the cooling device at the site. Compared to the case of centrally managing a plurality of refrigeration equipment, high-speed and high-accuracy modulation notification and modulation cause notification can be performed.

[0020]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, a preferred embodiment of the present invention will be described. Note that the same components as those of the conventional cold / hot remote monitoring apparatus are denoted by the same reference numerals, and description thereof will be omitted.

FIG. 17 shows an example of the cold / hot remote monitoring apparatus according to the present embodiment. First, as shown in FIG.
Has a compressor 8a, a condenser 8b, an expansion valve 8c, an evaporator 8d, and a refrigerant circuit 8 for transporting refrigerant to these. The refrigerant gas is compressed in the compressor 8a, the compressed refrigerant gas is sent to the condenser 8b via the refrigerant circuit 8, and the refrigerant gas compressed in the condenser 8b is cooled to become a refrigerant liquid. Thereafter, the refrigerant is sent to the expansion valve 8c via the refrigerant circuit 8. The pressure of the refrigerant liquid is reduced at the expansion valve 8c and sent to the evaporator 8d via the refrigerant circuit 8. In the evaporator 8d, the refrigerant liquid having the reduced pressure evaporates at a low temperature, and the temperature inside the evaporator 8d is reduced. Lower. Thereby, the water flowing in from the cold water inlet 22 is cooled in the evaporator 8d, and the cold water flows out from the cold water outlet 21. The cooling water cools the air to perform a cooling / freezing function. Further, a control circuit 8e for controlling the operation of the air conditioner 7 is provided.

FIG. 17 shows an example of mounting a sensor at a measurement point of the cold / hot remote monitoring apparatus according to the present embodiment. The compressor 8a has a sensor 9 for detecting discharge temperature and high pressure, and a sensor 10 for detecting suction temperature and low pressure.
And a sensor 11 for detecting a crankcase temperature, a motor frame temperature, and a hydraulic pressure. Further, a sensor 15 for detecting the outside air temperature is attached to the condenser 8b, and a sensor 12 for detecting the liquid temperature of the refrigerant is attached to a refrigerant circuit between the condenser 8b and the expansion valve 8c. The cold water inlet 22 is provided with a sensor 14 for detecting a cold water inlet temperature, and the cold water outlet 21 is provided with a sensor 13 for detecting a cold water outlet temperature. Also,
A sensor 16 for monitoring a contact signal is attached to the control circuit 8e.

Then, as shown in FIG.
The analog values of the operation data measured at 10, 11, 12, 13, 14, 15, 16 are transmitted to the A / D converter 2 and converted into digital values. The operation data of the sensor converted into a digital value in the A / D conversion device 2 is sent to the management device 33 and stored. Then, the management device 33 performs an abnormality / modulation detection process of the stored operation data, and when the abnormality or the modulation is detected, the abnormality or the modulation is transmitted from the transmission / reception device 4 via the communication line to the business office terminal. To the monitoring device 20.

Next, an abnormality detection process of the management device 33 according to the present embodiment will be described with reference to FIGS.

First, the operation data transmitted from the A / D converter 2 is read (step S100). In the abnormality detection processing, for example, when it is detected that the contact state of the air conditioner protection device has been switched from “OFF” to “ON”, it is recognized that an abnormality has occurred. On the other hand, in the modulation detection process, a detection condition is set in advance for each operation data item to be collected in the management device 33, and the magnitude of the reference value preset in the management device 33 and the collected operation data is large or small. A comparison is made to recognize the modulation (step S10).
2). Next, it is detected whether the modulation is light modulation or heavy modulation (step S104), and the cause of the modulation is analyzed (step S106). The management device 33 collects operation data of the sensor from the A / D converter 2 at intervals of several minutes, and performs modulation detection processing and cause analysis in the same cycle as the data collection timing. In the cause analysis, a time detection condition is provided, and when a condition of a cause analysis algorithm (described later) is continuously detected for X times, it is defined as “detection”. Then, when the modulation detection and the cause analysis are completed, the modulation degree and the analysis result are reported to the monitoring device 20 of the office terminal (step S110). In the monitoring device 20,
The monitor who has confirmed the abnormality or the modulation causes the monitoring device 20 to collect the save data stored in the management device 33 after the elapse of the save data generation time of the management device 33 according to the polling process (step S112). Then, the monitoring person can issue an accurate dispatch instruction in a short time in consideration of the abnormality report or the modulation report transmitted to the monitoring device 20, the degree of the modulation and the analysis result of the modulation cause. . In this embodiment, since the operation data before and after the occurrence of the modulation is used as the evacuation data, the storage range of the data for analyzing the modulation is expanded, so that the monitor can catch more detailed symptoms, and a more accurate dispatch instruction can be given. Can be sent to field workers.

FIG. 2 shows an example of a list of items to be subjected to modulation cause analysis in the present embodiment. As shown in FIG. 2, the common analysis items for cooling / heating of the air conditioner are “hydraulic pressure”, “discharge pressure”, “winding temperature”, and “current”, and “hydraulic pressure” and “discharge pressure”. Is determined to be light modulation or heavy modulation, and in the case of light modulation, the cause of the modulation is further analyzed. On the other hand, the “winding temperature” and the “current” are only determined for the double modulation. In the case of cooling operation, the analysis items are "high pressure", "low pressure", "uncooled", "startup failure", and "freezing", and "high pressure" and "low pressure" are lightly modulated. After determining whether there is any modulation or heavy modulation, in the case of light modulation, the cause of the modulation is further analyzed. On the other hand, "uncooled", "startup failure", and "freeze" are determined to be double modulation, and cause analysis of double modulation is performed. The determination of the degree of modulation and the analysis of the cause of modulation will be described later with reference to FIGS.

Further, among the items described above, the modulation cause item in the case of light modulation is shown in FIG. That is,
In the case of light modulation of “high pressure”, analysis is performed on four items of “refrigerant overfill”, “overload”, “heat exchange contamination”, and “outside air rise”. Further, in the case of light modulation of “low pressure”, there are six types of “insufficient refrigerant”, “clogged refrigerant circuit”, “dirty cooler”, “insufficient water amount”, “liquid back”, and “low internal pressure”.
An analysis is performed on the item. Further, in the case of light modulation of the "hydraulic pressure", "insufficient oil amount", "liquid back (excessive)",
Analysis is performed for four items, “liquid back (small)” and “crankcase heater abnormality”. In addition, in the case of light modulation of “discharge temperature”, “coagulator overload”, “compressor failure”,
Analysis is performed on four items, “clogged refrigerant circuit” and “excess or insufficient refrigerant”. In the case of “uncooled (cooling)” and “freezing (cooling)”, it is determined whether or not the modulation is heavy, and in the case of the modulation, the cause analysis is performed. "Insufficient capacity" and "excessive load or excessive capacity", "insufficient water", "stop pump", and "cooler refrigerant stagnation".

Next, whether or not double modulation is performed and analysis of each modulation cause will be described in detail with reference to FIGS.

<Multiple modulation of high pressure> As shown in FIG.
It is determined whether the operation of the compressor is in the “ON” state and “O”
N "(step S120), it is determined whether or not the high pressure value of the compressor is 24.0 kg / cm ² (2.35 × 10 ⁻³ Pa) or more, and it is 24.0 kg / cm ² or more. Is recognized (step S122), it is detected as “high pressure and pressure modulation” (step S124), and the process ends.

<Multi-modulation of low pressure> As shown in FIG.
It is determined whether the operation of the compressor is in the “ON” state and “O”
N "(step S130), it is determined whether or not the high-pressure pressure value of the compressor is 1.0 kg / cm ² (9.8 × 10 ⁻⁴ Pa) or less, and is 1.0 kg / cm ² or less. Is recognized (step S132), it is detected as "low pressure / pressure heavy modulation" (step S134), and the process ends.

<Hydraulic pressure modulation> As shown in FIG.
It is determined whether the operation of the compressor is in the “ON” state and “O”
For N "(step S140), the low pressure value of the hydraulic pressure of the compressor is determined whether or not ^{1.0kg / cm 2 (9.8 × 10} -4 Pa) or less, and 1.0 kg / cm ² or less If recognized (step S142), it is detected as "hydraulic pressure heavy modulation" (step S144), and the process ends.

<Multiple modulation of discharge temperature> As shown in FIG.
It is determined whether the operation of the compressor is in the “ON” state and “O”
In the case of “N” (step S150), it is determined whether or not the discharge temperature of the compressor is 130 ° C. or higher, and when it is recognized that the discharge temperature is 130 ° C. or higher (step S152), it is “discharge temperature double modulation”. It is detected (step S154), and the process ends.

<Overmodulation of Overcurrent> As shown in FIG. 8, it is determined whether or not the operation of the compressor is in the "ON" state.
N "(step S160), it is determined whether or not the current value of the compressor is equal to or greater than a preset current threshold value (threshold value). If it is determined that the current value is equal to or greater than the current threshold value (step S160). S162), it is detected as "overcurrent double modulation" (step S164), and the process ends.

<Multiple modulation of winding temperature> As shown in FIG.
It is determined whether the operation of the compressor is in the “ON” state and “O”
In the case of "N" (step S170), it is determined whether the motor frame temperature of the compressor is 40.0 ° C or higher (step S172). Double modulation ”(step S
174), end.

The above "high pressure", "low pressure", "hydraulic pressure", "discharge temperature", "overcurrent", "winding temperature"
Are determined mainly based on operation data measured by sensors 9, 10, 11 (shown in FIG. 17) attached to the compressor 8a.

<Double Modulation of Startup Failure> As shown in FIGS. 10 and 17, the operation state of the control circuit 8e in the sensor 16 is "cooling" (step S180), and the protection device of the control circuit 8e is set to "all". If the system is “OFF” (step S181) and the operation ON command is in the “ON” state (step S182), the ON value of the thermostat of the control circuit 8e is the chilled water inlet temperature detected by the sensor 14 of the chilled water inlet 22. It is determined whether it is lower than [° C]. And
If the ON value of the thermostat is lower than the cold water inlet temperature (step S183), it is determined whether or not the outside air temperature detected by the sensor 15 attached to the condenser 8b is higher than -10.0 ° C. If it is higher than -10.0 ° C. (step S184), the operation of the compressor 8a is set to “O
It is determined whether the state is “FF” (step S18).
5). Then, in the case of “OFF”, it is detected that “startup failure double modulation” (step S186), and the process ends.

<Multiple Modulation of Freezing> As shown in FIGS. 11 and 17, in the sensor 16 of the control circuit 8e, the compressor 8
a is in the “ON” state (step S190),
In the sensor 16, the operation state of the control circuit 8e is "cooling".
(Step S191), the sensor 13 at the chilled water outlet 21 determines whether or not the chilled water outlet temperature is lower than 4.0 ° C. (step S192). When the cold water outlet temperature is lower than 4.0 ° C., the cold water outlet 21 and the cold water inlet 22
It is determined whether or not the temperature difference of the cold water, that is, the difference between the temperatures detected by the sensors 13 and 14 exceeds 4.0 ° C. (step S193). If the temperature difference exceeds 4.0 ° C., It is detected that the modulation cause is “insufficient amount of water” (step S194). On the other hand, the cold water outlet 21 and the cold water inlet 22
If the temperature difference of the cold water is 4.0 ° C. or less (step S1)
93), it is detected that the modulation cause is “pump stop” (step S197), and the process ends.

When it is determined that the operation of the compressor 8a is in the "OFF" state (step S190), the chilled water outlet temperature measured by the sensor 13 of the chilled water outlet 21 for each lapse of a predetermined time is used. It is determined whether the difference is smaller than 4.0 ° C. (step S195). And
If the difference between the chilled water outlet temperatures is smaller than 4.0 ° C., it is detected as “cooler refrigerant stagnation” (step S196), and the process ends. On the other hand, when the difference between the chilled water outlet temperatures is larger than 4.0 ° C., the process ends.

<Light Modulation of High Pressure> As shown in FIGS. 12 and 17, the operation of the compressor 8a is "ON" in the sensor 16 of the control circuit 8e (step S20).
0) Further, when the operation state of the control circuit 8e in the sensor 16 is "cooling" (step S201), the compressor 8
a is 23.0 kg / cm ² (22.5 × 1
0 ^-3 Pa) is determined by whether more (step S
202). Here, the high pressure value is 23.0 kg / cm ²
If it is recognized that the above is the case, then the condensation temperature of the condenser 8b measured by the sensor 12 is added to the outside air temperature measured by the sensor 15 by 20.0 ° C. (that is, “the outside air temperature +
20.0 ° C. ”) (step S2).
03), if the condensation temperature is equal to or higher than “outside air temperature + 20.0 ° C.”, it is determined whether the degree of supercooling is equal to or higher than 15.0 [deg ° C.] (step S204). The degree of supercooling is 15.0 [de
g.degree. C.] or more, it is detected that the modulation cause is "coolant overfilling" (step S205), and the process ends.

On the other hand, when the condensation temperature is "outside air temperature + 20.0
° C ”(step S203), it is detected that the modulation cause is“ rising outside air ”(step S206),
finish.

If the degree of supercooling is less than 15.0 [deg.degree. C.] (step S204), the sensor 1
It is determined whether the chilled water inlet temperature measured in Step 4 is 40.0 ° C. or higher (Step S207), and
If the temperature is 0.0 ° C. or higher, it is detected that the modulation cause is “overload” (step S208), and the process ends.

If the chilled water inlet temperature is lower than 40.0 ° C. (step S207), it is detected that the cause of modulation is “heat exchanger dirt” (step S209), and the process ends.

<Light Modulation of Low Pressure> As shown in FIGS. 13 and 17, the operation state of the control circuit 8e in the sensor 16 is "cooling" (step S210), and the compressor 8a
Is in the “ON” state (step S21)
1) The low pressure value of the compressor 8a is 3.0 kg / cm
² (2.9 × 10 ⁻³ Pa) or less. When the low pressure value is 3.0 kg / cm ² or less,
It is determined whether or not the degree of supercooling is 15.0 [deg ° C] (step S213). If the degree of supercooling is 15.0 [deg ° C], the degree of superheat is 20.0 [deg ° C] or more. It is determined whether or not (Step S214). Superheat degree is 20.0 [deg
° C] or more, it is detected that the cause of the modulation is “clogged refrigerant circuit” (step S215), and the process ends.

On the other hand, when the operation of the compressor 8e is "OFF" (step S211), it is determined whether or not the low pressure value of the compressor 8a is 2.0 kg / cm ² (2.0 × 10 ⁻³ Pa) or less. Is determined (step S216), and when the low pressure value is equal to or less than 2.0 kg / cm ² , the modulation cause is detected as “lower internal pressure” (step S217), and the process ends.

If the degree of subcooling is less than 15.0 [deg.degree. C.] (step S213), it is detected that the cause of modulation is "insufficient refrigerant" (step S222), and the process ends. On the other hand, when the degree of supercooling exceeds 15.0 [deg ° C.] (step S213), it is detected that the modulation cause is “liquid back” (step S218), and the process ends.

If the degree of superheat is less than 20.0 [deg.degree. C.] (step S214), the arithmetic average temperature difference is 2
It is determined whether the temperature is not less than 0.0 [deg ° C] and 20.0
If it is [deg ° C.] or more, it is detected that the modulation cause is “cooler contamination” (step S220), and the process ends. On the other hand, when the arithmetic mean temperature difference is less than 20.0 [deg ° C.], it is detected that the modulation cause is “insufficient water amount” (step S221), and the process ends.

<Light Modulation of Hydraulic Pressure> As shown in FIGS. 14 and 17, when the operation of the compressor 8a is "ON" in the sensor 16 of the control circuit 8e (step S2).
30), the low pressure value of the hydraulic pressure of the compressor 8a is 2.5 kg /
cm ² (2.5 × 10 ⁻³ Pa) or less (step S231). The low pressure value of the hydraulic pressure is 2.
When the pressure is 5 kg / cm ² or less, the crankcase temperature is 2
It is determined whether the temperature is 0.0 ° C. or higher (step S23).
2) If the crankcase temperature is 20.0 ° C. or higher, it is detected that the modulation cause is “insufficient oil amount” (step S23).
3), end.

On the other hand, if the operation of the compressor 8a is "OFF" (step S230), the crank chamber temperature is set to 20.0
It is determined whether the temperature is lower than ° C (step S234), 2
If the temperature is lower than 0.0 ° C., it is detected that the modulation cause is “crankcase heater abnormality” (step S23).
5), end.

The low pressure value of the hydraulic pressure is 2.5 kg / c.
m ² or less, when the crank chamber temperature is less than 20.0 ° C. (step S232), the degree of superheat is determined whether or not less than 0.0 [deg ℃] (step S236), the degree of superheat is 0. If it is less than 0 [deg.degree. C.], it is detected that the modulation cause is "liquid back (excessive)" (step S237), and the process ends. On the other hand, when the superheat degree is 0.0 [deg ° C] or more,
It is detected that the modulation cause is "liquid back (small)" (step S238), and the process ends.

<Light Modulation of Discharge Temperature> As shown in FIGS. 15 and 17, the sensor 16 of the control circuit 8e determines whether or not the operation of the compressor 8a is in the "ON" state.
If “N” (step S240), it is determined whether the discharge temperature measured by the sensor 9 of the compressor 8a is 120.0 ° C. or higher (step S241). Discharge temperature is 12
When the temperature is 0.0 ° C. or more, the high pressure value measured by the sensor 9 of the compressor 8a is 22.5 kg / cm ² (22.1 ×
10 ⁻³ Pa) or more (Step S)
242) If the high pressure value is 22.5 kg / cm ² or more, it is detected that the cause of modulation is “condenser overload” (step S243), and the process ends.

On the other hand, when the high pressure value is 22.5 kg / cm ²
If it is less than or equal to (Step S242), the superheat degree is 20.
It is determined whether the temperature is less than 0 [deg ° C] (step S2).
44) If it is less than 20.0 [deg ° C.], it is detected that the modulation cause is “compressor failure” (step S24).
5), end. On the other hand, when the degree of superheating is 20.0 [deg ° C.] or more (step S244), the degree of supercooling is 4.0.
It is determined whether the temperature is [deg ° C.] or more (step S24).
6) If the degree of supercooling is 4.0 [deg ° C] or more,
It is detected that the modulation cause is “clogged refrigerant circuit” (step S247), and the process ends. On the other hand, the degree of supercooling is 4.0 [de
If it is less than [g ° C.], it is detected that the modulation cause is “excess or insufficient refrigerant” (step S248), and the process ends.

<Light modulation of uncooled light> As shown in FIGS. 16 and 17, in the sensor 16 of the control circuit 8e, the compressor 8
a is in the “ON” state (step S250),
In the sensor 16, the operation state of the control circuit 8e is "cooling".
(Step S251), it is determined whether the chilled water inlet temperature measured by the sensor 14 of the chilled water inlet 22 is lower than 20.0 ° C (step S252). When the chilled water inlet temperature is lower than 20.0 ° C., the chilled water inlet temperature is a temperature obtained by adding 7.0 ° C. to the thermostat OFF temperature value preset in the control circuit 8e (that is, “thermostat OFF temperature value + 7.0”). ° C ”) is determined (step S253). If the chilled water inlet temperature exceeds the “thermostat OFF temperature value + 7.0 ° C”,
It is detected that the modulation cause is "large load or insufficient capacity" (step S254), and the process ends.

On the other hand, if the chilled water inlet temperature is 20.0 ° C. or higher, it is detected that the modulation cause is “excessive load or insufficient capacity” (step S255), and the process ends.

The above-mentioned "heavy modulation of start-up failure", "heavy modulation of freezing", "light modulation of high pressure", "light modulation of low pressure", "light modulation of hydraulic pressure", "light modulation of discharge temperature""
The modulation cause analysis in the “uncooled light modulation” is performed based on operation data having a plurality of correlations detected by a plurality of sensors.

[0055]

As described above, according to the cooling / heating remote monitoring device according to the present invention, the management device classifies the modulation degree at the time of the modulation determination, reports the modulation, and also reports the modulation level information. Even if the same item is modulated, the level of urgency at the time of notification is clarified by the modulation level, and the criterion for the supervisor receiving the notification to issue a dispatch instruction is clarified.

Further, the management device automatically analyzes the cause of the occurrence of the modulation relative to other correlated operating data, and notifies the cause of the modulation at the time of the modulation determination. Irrespective of the degree of possession of specialized knowledge, it is possible to obtain a highly accurate cause analysis result, and it is possible to prevent a conventional variation in cause analysis. Further, the result of the cause analysis can be obtained in a short time. Also,
It is also possible to prevent human judgment errors by the monitor as in the conventional case.

In addition, as compared with the conventional method in which the operation data only before the occurrence is used as the save data, the operation data before and after the occurrence of the modulation is used as the save data, so that the storage range of the data for analyzing the modulation is expanded. Thus, the monitor can catch more detailed symptoms, and can send a more accurate dispatch instruction to the field worker.

[Brief description of the drawings]

FIG. 1 is a flowchart showing a process of a management device which implements a failure diagnosis process in the cold remote monitoring device of the present invention.

FIG. 2 is a diagram illustrating analysis data items in a failure diagnosis process according to the present invention.

FIG. 3 is a diagram illustrating output items of a failure diagnosis process according to the present invention.

FIG. 4 is a flowchart showing a high pressure / pressure double modulation detection process in a cause analysis process in the failure diagnosis process shown in FIG. 1;

FIG. 5 is a flowchart showing a low pressure / pressure heavy modulation detection process in the cause analysis process in the failure diagnosis process shown in FIG. 1;

FIG. 6 is a flowchart showing hydraulic pressure double modulation detection processing in cause analysis processing in the failure diagnosis processing shown in FIG. 1;

FIG. 7 is a flowchart showing discharge temperature double modulation detection processing in the cause analysis processing in the failure diagnosis processing shown in FIG. 1;

8 is a flowchart showing an overcurrent double modulation detection process in the cause analysis process in the failure diagnosis process shown in FIG.

FIG. 9 is a flowchart showing winding temperature double modulation detection processing in the cause analysis processing in the failure diagnosis processing shown in FIG. 1;

FIG. 10 is a flowchart showing a start failure double modulation detection process in the cause analysis process in the failure diagnosis process shown in FIG. 1;

11 is a flowchart showing frozen double modulation detection processing in cause analysis processing in the failure diagnosis processing shown in FIG. 1.

12 is a flowchart showing a high-pressure light modulation detection process in the cause analysis process in the failure diagnosis process shown in FIG.

FIG. 13 is a flowchart showing a low-pressure light modulation detection process in the cause analysis process in the failure diagnosis process shown in FIG. 1;

FIG. 14 is a flowchart showing a hydraulic pressure light modulation detection process in a cause analysis process in the failure diagnosis process shown in FIG. 1;

FIG. 15 is a flowchart showing a discharge temperature light modulation detection process in a cause analysis process in the failure diagnosis process shown in FIG. 1;

FIG. 16 is a flowchart showing uncooled light modulation detection processing in cause analysis processing in the failure diagnosis processing shown in FIG. 1;

FIG. 17 is a diagram showing an example in which the sensor of the cold / hot remote monitoring apparatus of the present invention is attached to an air conditioner.

FIG. 18 is a schematic diagram showing a configuration of a cold / hot remote monitoring apparatus of the present invention.

FIG. 19 is a schematic diagram showing a configuration of a conventional cold remote monitoring device.

20 is a flowchart showing a process performed by the management device in the cooling / heating monitoring device shown in FIG. 19;

[Explanation of symbols]

1 sensor, 2 A / D converter, 3 management device, 4,
5 transmitting / receiving device, 6 office terminal, 7 air conditioner, 8 refrigerant circuit, 8a compressor, 8b condenser, 8c expansion valve, 8d
Evaporator, 8e control circuit, 9, 10, 11, 12, 1
3, 14, 15, 16 sensors, 20 monitoring devices, 21
Cold water outlet, 22 Cold water inlet, 33 management device.

Claims (4)

[Claims] 1. A plurality of sensors for measuring operation data attached to a plurality of measurement points of a cooling / heating device, and collecting and accumulating operation data from the plurality of sensors, performing arithmetic processing, and modulating based on the collected operation data. Judgment is performed, and at the time of modulation judgment, the degree of modulation is further divided into levels.
A management device that reports modulation and also reports modulation level information, and a monitoring device that is connected to the management device via a communication line and monitors a modulation report from the management device. Cold / heat remote monitoring device with failure diagnosis function. 2. The remote monitoring apparatus with a failure diagnosis function according to claim 1, wherein the management device further analyzes a cause of modulation based on operation data from the plurality of sensors, and sends the modulated data to the monitoring device. A cooling / heating remote monitoring apparatus with a failure diagnosis function, which also notifies the cause of the modulation together with the modulation notification. 3. The cold / heat remote monitoring device with a failure diagnosis function according to claim 1, further comprising: a management device that stores operation data before and after the occurrence of modulation as evacuation data; When receiving a report from the management device, the evacuation data is collected from the management device in accordance with a polling process. 4. The cold remote monitoring apparatus with a failure diagnosis function according to claim 1, wherein the management apparatus is disposed on a site where the cold equipment is installed. Cooling remote monitoring device with a failure diagnosis function.