JP2018106622A - Facility management device and facility management method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To eliminate the need to change setting of a threshold for each monitoring point.SOLUTION: A facility management device comprises: a group management section 31 that manages a group for a monitoring point; a measuring value acquiring section 32 that acquires a measurement value relating to the monitoring point; a threshold setting section 33 that, for each group managed by the group management section 31, sets a threshold by using a corresponding measurement value acquired by the measurement value acquiring section 32; a malfunction determining section 34 that, for each group managed by the group management section 31, determines a malfunction by comparing a corresponding measurement value acquired by the measurement value acquiring section 32, with a corresponding threshold set by the threshold setting section 33; and warning output section 35 that outputs a warning in a case where the malfunction determining section 34 determines a malfunction.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a facility management apparatus and facility management method for monitoring a monitoring point.

  The conventional facility management device collects data indicating the measured value (analog value) related to the monitoring point set for the equipment in the facility, and if the measured value exceeds the upper limit value, it issues an upper limit alarm, When it falls below the lower limit value, it has a function of issuing a lower limit alarm (see, for example, Patent Document 1).

JP 2010-237920 A

The above functions in the conventional facility management apparatus are effective for monitoring points whose threshold values (upper limit value and lower limit value) do not change throughout the year. In patent document 1, the water level of a roof tank is taken as an example as a monitoring point, and the threshold value with respect to this water level is not changed in principle.
On the other hand, for example, at a monitoring point whose set value changes depending on the season, such as the indoor set temperature of the air conditioner, it is necessary to change the setting of the threshold value for each monitoring point according to the season.

  The present invention has been made to solve the above-described problems, and an object of the present invention is to provide a facility management apparatus that eliminates the need to change the threshold setting for each monitoring point.

  The facility management device according to the present invention includes a group management unit that manages a group for a monitoring point, a measurement value acquisition unit that acquires a measurement value related to the monitoring point, and a measurement value acquisition for each group managed by the group management unit. A threshold setting unit that sets a threshold using the corresponding measurement value acquired by the unit, and a threshold setting unit that sets the corresponding measurement value acquired by the measurement value acquisition unit for each group managed by the group management unit. An abnormality determination unit that determines an abnormality in comparison with a corresponding threshold value set by (1) and an alarm output unit that outputs an alarm when the abnormality determination unit determines that an abnormality has occurred.

  According to this invention, since it comprised as mentioned above, the setting change of the threshold value for every monitoring point becomes unnecessary.

It is a block diagram which shows the structural example of the facility management system containing the facility management apparatus which concerns on Embodiment 1 of this invention. It is a flowchart which shows the operation example of the facility management apparatus which concerns on Embodiment 1 of this invention.

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.
Embodiment 1 FIG.
FIG. 1 is a block diagram showing a configuration example of a facility management system including a facility management apparatus 3 according to Embodiment 1 of the present invention.
As shown in FIG. 1, the facility management system includes a plurality of field devices 1, a plurality of controllers 2, and a facility management apparatus 3.

The field device 1 measures a measurement value (analog value) related to the monitoring point as needed. And the field apparatus 1 transmits the data which show the measured value to the controller 2 connected via the communication line.
One or more monitoring points are set by the facility management apparatus 3 for devices installed in a facility such as a building. As an apparatus, an air conditioner is mentioned, for example. Moreover, as a monitoring point, when an apparatus is an air conditioner, indoor set temperature and actual indoor temperature are mentioned, for example.

  The controller 2 collects data indicating measurement values related to monitoring points from the field device 1 connected via a communication line. And the controller 2 transmits the data which show the collected measured value to the facility management apparatus 3 connected via the communication line regularly (for example, every 1 minute) or whenever there is a change in the measured value.

  The facility management apparatus 3 collects data indicating the measurement value related to the monitoring point from the controller 2 connected via the communication line, and monitors the monitoring point. As shown in FIG. 1, the facility management apparatus 3 includes a group management unit 31, a measurement value acquisition unit 32, a threshold setting unit 33, an abnormality determination unit 34, and an alarm output unit 35. The facility management apparatus 3 is realized by a processing circuit such as a system LSI, a CPU that executes a program stored in a memory, or the like.

  The group management unit 31 manages a group for the monitoring point. Here, as a group, for example, a group of monitoring points that are the same control target in the same control system, a group of monitoring points for a plurality of devices that perform control of the same target, and a group of monitoring points that have the same control purpose Can be mentioned. Examples of the monitoring point group that is the same control target in the same control system include a group of indoor temperatures measured by a VAV (Variable Air Volume) unit of the same air conditioner. Moreover, as a group of monitoring points for a plurality of devices that control the same target, for example, a group of indoor temperatures measured by VAV units of a plurality of air conditioners that control the same floor can be cited. In addition, examples of the monitoring point having the same control purpose include a group in which the air conditioning instrumentation is the same and the room temperature setting is the same. The group managed by the group management unit 31 is set in advance by a facility manager or the like.

  The measurement value acquisition unit 32 acquires a measurement value related to the monitoring point. Note that the measurement value acquisition timing by the measurement value acquisition unit 32 is the same as the timing at which the facility management apparatus 3 collects data indicating the measurement value (periodically (for example, every minute) or whenever the measurement value changes). There may be different timings (periodic (for example, 10-minute cycle)).

  The threshold setting unit 33 sets a threshold using the corresponding measurement value acquired by the measurement value acquisition unit 32 for each group managed by the group management unit 31. Examples of the threshold include an upper limit value, a lower limit value, or both an upper limit value and a lower limit value. The threshold setting by the threshold setting unit 33 is performed and updated every time a measurement value is acquired by the measurement value acquisition unit 32.

  The abnormality determination unit 34 compares the corresponding measurement value acquired by the measurement value acquisition unit 32 with the corresponding threshold set by the threshold setting unit 33 for each group managed by the group management unit 31. Determine. Moreover, the abnormality determination by the abnormality determination unit 34 is performed every time the measurement value is acquired by the measurement value acquisition unit 32.

  The alarm output unit 35 outputs an alarm when the abnormality determination unit 34 determines that an abnormality has occurred. Here, for example, when both the upper limit value and the lower limit value are set as threshold values, the alarm output unit 35 issues an upper limit alarm when the abnormality determination unit 34 determines that the measured value exceeds the upper limit value. An alarm is issued, and if the value falls below the lower limit, a lower limit alarm is issued.

Next, an operation example of the facility management apparatus 3 according to the first embodiment will be described with reference to FIG. The group management unit 31 manages a group for the monitoring points set in advance by the facility manager or the like.
In the operation example of the facility management device 3, as shown in FIG. 2, first, the measurement value acquisition unit 32 acquires data indicating the measurement value regarding the monitoring point (step ST <b> 1). The measurement value acquisition by the measurement value acquisition unit 32 is continuously performed at a predetermined acquisition timing.

  Next, the threshold setting unit 33 sets a threshold for each group managed by the group management unit 31 using the corresponding measurement value acquired by the measurement value acquisition unit 32 (step ST2). At this time, for example, the threshold value setting unit 33 calculates the average value and the standard deviation of the corresponding measurement values for each group, and sets the threshold value from the average value and the standard deviation. Hereinafter, setting of the upper limit value by the threshold setting unit 33 will be described.

Here, it is assumed that there are n monitoring points (number of samples) belonging to a certain group, and the measured values measured by each field device 1 are x _i (i = 1 to n). In this case, the threshold setting unit 33 calculates the average value m and the standard deviation σ of each measurement value x _i from the following expressions (1) and (2).

  Then, the threshold setting unit 33 sets the upper limit value using the calculated average value m as the central value of the threshold and using a constant multiple of the standard deviation σ as the threshold width. Here, examples of the upper limit include m + σ, m + 2σ, and m + 3σ. Note that whether the upper limit value is m + σ, m + 2σ, or m + 3σ is arbitrarily set depending on the characteristics (variation) of the measurement values. For example, the constant multiplied by the standard deviation σ is increased for a measured value having a large variation, and the constant multiplied by the standard deviation σ is decreased for a measured value having a small variation. The characteristic of the measured value can be grasped experimentally, for example.

  In this way, by using the standard deviation σ in setting the threshold value, it is possible to prevent a large number of alarms from being raised even when there are many variations in measured values, that is, the influence of variations can be absorbed.

Also, a part of the value of the n measured values x _i of the threshold setting unit 33 is used by protruding to the other value, if the value of a portion of which is abnormal, by using this value average If the value m and the standard deviation σ are calculated, the average value m and the standard deviation σ in a normal system may not be calculated. Therefore, the threshold setting unit 33 of the n measured values x _i, projecting value (e.g., maximum value, minimum value, both the maximum value and the minimum value) using the measurement values excluding the average value m The standard deviation σ may be calculated.

  Although the case where the threshold value setting unit 33 sets the upper limit value has been described above, the same applies to the case where the lower limit value is set. If said example is used, as a lower limit, m- (sigma), m-2 (sigma), m-3 (sigma) will be mentioned, for example.

  In the above description, the case where the average value m and the standard deviation σ are used when setting the threshold value is shown. However, the present invention is not limited to this, and the threshold value may be set by other methods. For example, the threshold value setting unit 33 calculates the average value m of the corresponding measurement values for each group, sets the average value m as the central value of the threshold value, sets a preset fixed value as the threshold value width, and sets the threshold value. It may be set.

  Next, the abnormality determination unit 34 compares the corresponding measurement value acquired by the measurement value acquisition unit 32 with the corresponding threshold set by the threshold setting unit 33 for each group managed by the group management unit 31. The abnormality is determined (step ST3).

  Next, the alarm output unit 35 outputs an alarm when the abnormality determination unit 34 determines that there is an abnormality (step ST4).

As described above, in the facility management apparatus 3 according to the first embodiment, the threshold value is not set as an absolute value for each monitoring point, but the statistics are automatically set using the group set in advance for the monitoring point as a population. Calculate and treat the measured values that are relatively unique within the group as abnormal.
For example, suppose that there are n VAV units in the same air conditioner group and each measures the room temperature. And when the measured temperature in one of them is relatively abnormally high, this is treated as abnormal. As a result, after that, the situation is confirmed, and by investigating the cause such as failure of the VAV unit, failure of the duct equipment, abnormal setting of the set value (abnormal operation), etc., it becomes possible to detect the failure early.

  As described above, according to the first embodiment, the group management unit 31 that manages the group for the monitoring point, the measurement value acquisition unit 32 that acquires the measurement value related to the monitoring point, and the group management unit 31 manage the group. For each group, a threshold value setting unit 33 that sets a threshold value using a corresponding measurement value acquired by the measurement value acquisition unit 32, and a measurement value acquisition unit 32 for each group managed by the group management unit 31. The acquired measurement value is compared with the corresponding threshold set by the threshold setting unit 33 to determine an abnormality, and an alarm is output when the abnormality determination unit 34 determines an abnormality. Therefore, it is not necessary to change the threshold setting for each monitoring point. As a result, it leads to early detection of abnormal conditions or inappropriate operation and prevention of complaints.

  In the above description, the case where the device is an air conditioner has been described as an example. However, the present invention is not limited to this, but can be applied to other devices in the same manner, and the same effects as described above can be obtained. For example, cold water and hot water used in an air conditioner are supplied from a plurality of heat source units, and the heat source unit is provided with a sensor for measuring an outlet temperature. Therefore, the facility management apparatus 3 may perform monitoring with the equipment as a heat source machine and the monitoring point as the outlet temperature.

  In the present invention, any constituent element of the embodiment can be modified or any constituent element of the embodiment can be omitted within the scope of the invention.

DESCRIPTION OF SYMBOLS 1 Field apparatus 2 Controller 3 Facility management apparatus 31 Group management part 32 Measurement value acquisition part 33 Threshold value setting part 34 Abnormality determination part 35 Alarm output part

Claims (8)

A group management unit for managing groups for monitoring points;
A measurement value acquisition unit for acquiring a measurement value related to the monitoring point;
For each group managed by the group management unit, a threshold setting unit that sets a threshold using the corresponding measurement value acquired by the measurement value acquisition unit;
For each group managed by the group management unit, an abnormality determination unit that determines an abnormality by comparing a corresponding measurement value acquired by the measurement value acquisition unit with a corresponding threshold set by the threshold setting unit When,
A facility management apparatus comprising: an alarm output unit that outputs an alarm when an abnormality is determined by the abnormality determination unit. The facility according to claim 1, wherein the threshold value setting unit calculates an average value and a standard deviation of the corresponding measurement values for each group, and sets the threshold value from the average value and the standard deviation. Management device. The facility management apparatus according to claim 1, wherein the threshold setting unit calculates an average value of the corresponding measurement values for each group and sets the threshold value from the average value and a fixed value. The said threshold value setting part uses the measured value except the protruding value among the said corresponding measured values for every said group. The Claim 1 characterized by the above-mentioned. Facility management device. The facility management device according to any one of claims 1 to 4, wherein the group is a group of the monitoring points that are the same control target in the same control system. The facility management apparatus according to any one of claims 1 to 5, wherein the group is a group of the monitoring points for a plurality of devices that control the same target. The facility management device according to any one of claims 1 to 6, wherein the group is a group of the monitoring points having the same control purpose. The group management unit manages the group for the monitoring point,
A measurement value acquisition unit acquires a measurement value related to the monitoring point,
The threshold setting unit sets a threshold using the corresponding measurement value acquired by the measurement value acquisition unit for each group managed by the group management unit,
For each group managed by the group management unit, the abnormality determination unit compares the corresponding measurement value acquired by the measurement value acquisition unit with the corresponding threshold value set by the threshold setting unit, and detects an abnormality. Judgment,
A facility management method characterized in that an alarm is output when an alarm output unit is determined to be abnormal by the abnormality determination unit.

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