JPH0440318A - Method for monitoring measured value - Google Patents

Abstract

PURPOSE:To attain proper monitoring at all times by sampling a measured value for a constant period and monitoring the measured value of a measuring instrument while updating an upper and a lower limit value from a maximum and a minimum value and a mean value. CONSTITUTION:A measurement part 2 measures the voltage, current, etc., on the input or output side of a power facility 1 such as an uninterruptible power supply unit and the result is recorded in a sequential recording part 3. An arithmetic part 6 finds the upper-limit and lower-limit values for alarming or abnormality monitoring from the maximum and minimum values and mean value of sampling from the calculation result. The upper-limit and lower-limit values which are found are set in a setting part 5 and supplied to a comparison part 4, which compares them with the measured value from the measurement part 2 to monitor the measured value. Values such as an upper-limit and a lower- limit level are set in a setting part 7 and when the measured value is not within the range as a result of monitoring based upon the upper-limit and lower-limit set values, an indication part 8 informs of it.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a method for monitoring measured values in a measuring instrument.

[Conventional technology]

Conventionally, this type of monitoring has generally been carried out using predetermined standard values as upper and lower limit set values.

[Problem to be solved by the invention]

However, with this method, even if the function of the measuring device deteriorates due to aging, for example, it will always be monitored at the same upper and lower limit set values, which is not necessarily an appropriate monitoring method. There is.

Therefore, an object of the present invention is to provide a method that allows more appropriate monitoring.

[Means to solve the problem]

While monitoring the measured values of the measuring equipment using predetermined standard values as the upper and lower limit settings, the process sequentially samples the measured values for a certain period of time and calculates new upper and lower limit settings from the maximum, minimum, and average values. By repeating this process, the measurement value of the measuring device is monitored while updating the upper and lower limit set values.

[Effect]

More appropriate monitoring is possible by sequentially updating the upper and lower limit set values while sequentially sampling the measured values for a certain period of time.

〔Example〕

FIG. 1 is a block diagram for explaining the invention in detail. In the same figure, 1 is, for example, an uninterruptible power supply bag? &(U
2 is a measurement section, 3 is a recording section (memory), 4 is a comparison section, 5 is a setting section (memo 1, 6 is a calculation section, 7 is a cent section, 8 is a display) An example will be shown in which a notification unit consisting of a printing device or the like monitors power supply equipment.

That is, the measuring section 2 measures the voltage, current, etc. on the input or output side of a power supply equipment l such as a UPS, and the results are sequentially recorded in the recording section 3. The calculation unit 6 calculates upper and lower limit set values for alarm or abnormality monitoring from this measurement result, for example, using the following equation.

Alarm upper limit value = (maximum value - minimum value) X level upper limit (%) /
100 + average value alarm lower limit = (maximum value - minimum value) X level lower limit (%) /
100 + average value Note that the maximum value and minimum value indicate the maximum and minimum values in a certain period of time that the measured values are formed, and the average value indicates the average of these measured values.The obtained upper and lower limit setting values are set in the setting section 5, This is given to the comparing section 4 and compared with the measured value from the measuring section 2, thereby monitoring the measured value. Since such calculations are performed repeatedly and set in the setting section 5, the upper and lower limit set values initially set as standard values are updated one after another, and monitoring is performed based on the updated upper and lower limit set values. It turns out. However, if the upper and lower limit set values obtained in this way exceed the original standard values, priority is given to the original standard values so that the performance of the equipment is not impaired. It is assumed that the values of the upper and lower limits of the level mentioned in the above formula are set in advance in the setting section 7. Furthermore, if the result of monitoring based on the upper and lower limit set values is outside the range, the notification unit 8 will notify that fact.

By the way, as mentioned above, the measurement value is normally monitored using its upper and lower limit set values. However, doing so causes the inconvenience that the abnormality cannot be detected in advance. Therefore, it is possible to do the following.

An embodiment for dealing with the case shown in FIG. 2 is shown. This is an example of monitoring measured values from the air conditioner 10, for example.
In addition, a remote terminal 11 and a remote terminal receiving section 12 are provided so that the remote terminal 11 and remote terminal receiving section 12 can be operated remotely, and the following processing is performed in the arithmetic section 6.

That is, when the operator issues an instruction to that effect using the switch 13, the calculation section 6 issues an instruction to the recording section 3, reads out the recent measurement data from the recording section 3, and divides the data between adjacent measurement data in time. Find the difference and calculate the average value. Here, the reason why we are trying to find the average value of the differences of multiple measurements rather than the difference between the two most recent measurement data is because
- This is to avoid the effects of temporal changes. Then, when the average value of this difference exceeds a preset value,
Since it is considered that an unusual change has occurred in the air conditioner 10, it is possible to know the signs (tendencies) of the abnormality from this. When the calculation unit 6 detects a change greater than a predetermined value, the calculation unit 6 notifies you of the sign of an abnormality using, for example, a buzzer in the notification unit 8.

〔Effect of the invention〕

According to this invention, since the upper and lower limit setting values of the measuring device are updated sequentially while being sampled, appropriate monitoring can be performed even when the measuring device has deteriorated.

Furthermore, by monitoring the rate of change in measured values, signs of equipment abnormality can be known, which can be used to prevent breakdowns and malfunctions.

[Brief explanation of drawings]

FIG. 1 is a block diagram for explaining the invention in detail,
FIG. 2 is a block diagram for explaining another embodiment of the invention. 1... is the originator (UPS), 2... measurement section, 3.
...Recording section (memory), 4...Comparing section, 5...Setting section (memory), 6...Calculating section, 7...Set section, 8
...Notification section, 10...Air conditioner, 11...Remote terminal, 12...Remote terminal receiving section, 3...Switch.

Claims (1)

[Claims] 1) While monitoring the measured values of a measuring device using predetermined standard values as upper and lower limit settings, the measured values are sequentially sampled for a certain period of time and a new upper limit is determined from the maximum, minimum, and average values. A method for monitoring measured values, characterized in that the measured values of a measuring device are monitored while updating the upper and lower limit set values by sequentially repeating the process of determining the lower limit set values. 2) Record the measured values of the measuring device while sampling them sequentially, find the difference between adjacent sampling values and the average value, and compare the average value of this difference with a predetermined value to determine the measurement value of the measuring device. A method for monitoring measured values, characterized by monitoring measured values.