JP2771771B2 - Error level judgment method - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an abnormal level judging device, and more particularly, to a machine controlled by a relay sequence, such as a sluice gate used for power generation, water use, water discharge and tide prevention business, and a pumping equipment of a pumping station. The present invention relates to an abnormality level determination device that discovers a cause of a failure such as an operation failure state and assists recovery of the equipment.

[0002]

2. Description of the Related Art For example, in mechanical equipment controlled by a relay sequence, such as a sluice gate and a pump equipment of a pumping station used for power generation, water use, water discharge and tide prevention business, etc.
There is a case where the operation device stops operating due to a minor failure such as a malfunction of the operation device due to some cause. In the case of such a minor failure, particularly in an emergency, the operation may be forcibly restarted only with the operable operating device without waiting for the repair of the defective device.

[0003] Therefore, it is necessary to determine whether or not the above-mentioned failure level is a minor failure. Conventionally, when the operation of operating equipment is stopped, protection devices such as limit switches, pressure switches, motor relays, and circuit breakers for wiring are activated, and when the protection devices are activated, the operation stop status is notified by a predetermined indicator light or alarm buzzer. Then, the operator confirms this. Based on this, the worker investigates the status of the instrument related to the operation of the protection device, the operation status of the equipment and the status of the related indicator lights, and determines whether or not the operation status of the protection device matches. I do. If it is determined from the result of the determination by the operator that the operating device is a minor failure, the operator manually restarts the operation of only the operable operating device manually. In this way, the failure diagnosis of the mechanical equipment is performed based on the display information of the control panel described above or an interactive type software designed based on a failure tree [FT diagram] in which the causal relationship of the failure occurrence is systematized. Offline method is adopted.

[0004]

By the way, in the case of the display information on the control panel, the worker has determined the failure level as to whether or not the failure is minor, as described above. Unless various information such as the role, function, and operating condition of the device is sufficiently grasped, it is very difficult to determine whether or not a minor failure has occurred. Therefore, the operator needs to have knowledge of the meaning of each piece of display information, their relevance, the cause of the failure display, and the recovery method, and is a skilled worker with sufficient knowledge and experience regarding the equipment including the protection device. It was necessary.

[0005] Further, even a skilled worker is limited to the number of protection devices in which the failure display items are installed, and the control panel is required to estimate the direct cause and the direct cause. Is not provided, it is necessary to investigate the condition of the instrument related to the operation of the protection device, the condition of the operation of the equipment and the condition of the related indicator lights, which is a great deal of labor and time. That was the current situation.

Further, in the case where the data of the operating element disappears after the protection device is operated, for example, when a minor failure of the operating device is caused by the overcurrent, the overcurrent protection device for detecting the overcurrent has a problem in that the Although the value is an operating element, the instruction of the current value is 0 after the protection device is activated, so the instruction immediately before the occurrence of the fault must be constantly monitored, and if this is overlooked, it is impossible to judge if it is overlooked. Was.

Further, in the above-described sequence control circuit of the operating device, among the plurality of relay contacts that are opened and closed by one relay, each relay contact is shared for display, operation, and the like. If a defect occurs in a part of the relay relay, for example, even if the display relay contact is in a normal state, the operation relay contact will be in a failure state, and contradictory phenomena occur. In such a case, it takes a considerable amount of time for the operator to investigate the cause,
There was a problem that they could not cope in an emergency.

On the other hand, the software-designed interactive off-line method requires an operator to judge the situation and input interactively in the software design, and diagnoses and recovers from an emergency in the event of a time constraint such as a flood. It takes time as a way to help. In addition, there has been a problem that the accuracy of detecting the cause of a failure is greatly affected by the performance or failure of the software itself.

In view of the above, the present invention has been proposed in view of the above-mentioned problems. It is an object of the present invention to automatically automate the operation equipment so that it can be easily determined whether the failure level is a minor failure, and to reduce the electric power consumption. Anomaly levels that provide information so that even those who do not have specialized knowledge or experience in machinery can quickly determine the cause of a failure and support its recovery, thereby increasing the certainty of equipment operation and preventing the spread of accidents. An object of the present invention is to provide a determination method and an apparatus.

[0010]

As a technical means for achieving the above object, an abnormal level judging method according to the present invention comprises a plurality of relays which are opened and closed by one relay in relation to operating equipment .
Two of the relay contacts selected from the shared operation items
Comparing the open / closed state of the two relay contacts and
The operating condition of the relay is used as a criterion,
A diagnostic matrix that classifies the judgment results by the state and the operation element is created in advance, and when the operation apparatus stops operating during sequence control of the operation apparatus by opening and closing the relay contacts,
The open / closed state of the relay contacts and the operating elements immediately before the stop of operation
By based rather determination result to the diagnostic matrix from, characterized in that so as to determine the abnormal level of the operation device.

[0011]

[0012]

[0013]

[0014]

According to the present invention, an operating device by opening and closing a relay contact is provided.
When the operating device stops operating during the sequence control of
By based rather determination result <br/> diagnostic matrix from off state and the operating elements of the relay contact just before shutdown, it is so arranged to determine the abnormal level of the operation device, the determination of the abnormal level is simplified .

[0015]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a method and apparatus for determining an abnormal level according to the present invention will be described with reference to FIGS. In the following embodiments, upper and lower limit detectors and overcurrent relays, which are main protection devices of a floodgate facility, will be described in detail.

In the present invention, first, a diagnostic matrix of a plurality of relay contacts related to the operating device is created in advance. Specifically, in the case of the above-mentioned upper and lower limit detectors, as shown in FIG. 1, for example, taking an upper limit switch of the upper and lower limit detectors as an example, among a plurality of relay contacts that are opened and closed by one relay, It is possible to detect the contact state by comparing the open / closed state of two relay contacts selected from the operation items to be operated, for example, both the operation relay contact and the display relay contact. There is an opening position as an operation element of, and the indicated value of the opening meter serves as a criterion. That is, in the case of the upper limit switch, the operation relay contact, the display relay contact, and the indication value of the opening meter are set as the judgment items. Then, when the determination result is classified into normal and minor failure including contact failure, operation failure, and malfunction, a diagnosis matrix as shown in FIG. 1 is created.

Based on the diagnostic matrix created in this way, as shown in FIG. 4, an operating relay contact X1 and a display relay contact X2 of the upper limit switch are provided.
The relay sequence circuit 1 includes a relay contact X3 that operates in the upper limit range of the opening meter. In the figure, a relay contact X0 is used to shut off the relay sequence circuit 1 when the opening meter becomes defective.

In the case of the overcurrent relay, the same applies to the upper and lower limit detectors, and as shown in FIG. 2, both the operation relay contacts and the display relay contacts selected from the shared operation items are used. The contact state can be detected by comparing the open / closed state, and the operating value of the overcurrent relay is a current value. When the overcurrent relay operates, the operation stops, and the current value after the operation becomes 0, so that the current value immediately before the operation becomes a criterion. In order to store the current value immediately before the operation of the overcurrent relay, a programmable controller described later is used, and the current value data immediately before the operation is stored in the memory. In this programmable controller, the updating of the data is stopped by the operation of the overcurrent relay, the stored contents are protected, and it is compared with a set value to detect whether or not an overcurrent state has occurred. In the case of this overcurrent relay, the judgment items include an operation relay contact,
When the display relay contact and the current value are set, and the result of the determination is classified into normal and minor failure including contact failure, operation failure and malfunction, a diagnosis matrix as shown in FIG. 2 is created.

Next, as another specific example, FIG. 3 shows a diagnostic matrix of a spindle type switching device. In this case, as shown in the figure, as the judgment items, an overcurrent, an opening limit, a closing limit, an opening limit zone and a closing zone of the opening meter are set, and the judgment results are classified as shown in the figure. Based on the diagnostic matrix created in this way, as shown in FIG. 5, the input signals from the relay contacts X4 to X8 of the overcurrent, the open limit, the close limit, the open limit zone and the close limit zone of the opening meter. Is configured by a programmable controller 2 which obtains a judgment output by BCD code [4 bits / 16 bits] conversion. In the programmable controller 2, for example,
It is possible to obtain 16 outputs for four inputs from the relay contacts X5 to X8 of the closing limit, the opening limit zone of the opening meter and the closing limit zone (broken line in the figure), and the relay sequence circuit as described above. 1 need not be configured.

In the embodiment described above, each relay contact X
As means for detecting the open / close state at 1 to X8, as shown in FIG. 6, there is a "contact open / closed state detecting apparatus using high frequency" proposed by the present applicant (Japanese Utility Model Application No. Hei 3-12808). For example, the operation relay contacts X1 to X3 and the display relay contact X4 have contact opening / closing state detection devices D1 to D3 and D4.
And the contact opening / closing state detecting devices D1 to D3, D4
Thus, the open / closed state of each of the relay contacts X1 to X3 can be extracted as an output signal.

The contact opening / closing state detecting devices D1 to D3, D
Based on the detection signal of No. 4, the relay sequence circuit 3 is configured as shown in FIG. This relay sequence circuit 3
Is a relay relay that opens and closes with a single relay.
By comparing the open / close states of both the operation relay contact DX1 and the display relay contact DX4 selected from the assigned operation items, the contact state is detected to determine whether or not a minor failure has occurred.

In the embodiment described above, the relay sequence circuits 1 and 3 or the programmable controller 2
Is attached with the operation sequence temporary recovery device (Japanese Patent Application No. Hei 4-93259) previously proposed by the present applicant, based on the result of determining whether or not the failure level of the operating device is a minor failure. If the failure level is a minor failure, the operation sequence temporary recovery device can forcibly restart the operation of the operating device.

The device of the present invention includes a relay contact opening / closing information and an instrument information capturing device on existing distribution boards and control panels which are existing facilities, a PLC for determining a cause of failure and searching for a recovery method from the captured information, Display device for displaying cause and recovery method, P with external storage device connected to PLC
C or the like is added. Specifically, the sequence control device of the water gate in the device of the present invention is a manual operation device (push button, changeover switch), a command processing unit (electromagnetic relay, timer), an operation device (electromagnetic contactor, circuit breaker), a detector ( It consists of a detection switch, protection relay), display and alarm equipment (indicator lamp, buzzer, bell), and incorporates a monitoring device that can detect the state of contacts (on or off) that generates binary information, and outputs contact opening and closing information. Then, measurement information is obtained by adding a device that takes in measurement information from a measurement device such as an opening meter that detects the position of the floodgate and an ammeter that detects the current.

The failure of the detector is determined by comparing the open / closed state of the position detection switch and the measurement information of the opening meter, the relay contact open / close state of the overcurrent relay, the measurement information of the ammeter, and the relay contact open / closed state of the voltage relay. It is determined whether the detector contact is operating based on the threshold value, and a normal operation or a malfunction / non-operation state is diagnosed. Regarding the contacts of the manual operation device and the electromagnetic relay, when a certain operation is performed and these contacts have a failure, the contact group does not operate according to the sequence designed logic. Therefore, a normal contact opening / closing operation is previously stored in the apparatus as a diagnosis table for each operation mode, and the normal or defective contact is diagnosed by comparing and calculating this with the monitoring contact opening / closing information.

The diagnostic information created by the above-described diagnostic matrix includes the open / closed state of the contact group corresponding to the normal state in each operation mode of the equipment, the operation state composed of the numerical information of the instrument, and the condition established before the push button operation. The operating condition consisting of the opening / closing state of the contact group and the numerical information of the instrument, the operating state consisting of the opening / closing state of the contact group and the numerical information of the instrument when an operation error occurs, and the occurrence of a power / control power supply abnormality The power supply state consisting of the open / closed state of the contact group and the numerical information of the meter, the combination of auxiliary contacts to be monitored mutually to detect the failure of the contact itself in the monitoring contact group, the contact failure state consisting of their open / closed state, and the contacts When a failure other than a failure occurs, there are various conditions such as the open / close state of the contact group and the failure state consisting of numerical information of the instrument. Show, or the state history can be automatically recorded. Furthermore, a diagnosis matrix may be created by associating recovery means with each of these failure causes, or the diagnosis matrix may be programmed to search and display a diagnosis result corresponding to the result of the online information actually taken in. It is possible.

As described above, in the above embodiment, since the information can be taken in online and the diagnosis result can be provided, it is possible to judge whether the operation is possible, operation error, power supply failure, contact failure, other failures, and the backup considered at the time of designing the equipment. Recovery means including operation can be displayed quickly and even at a place remote from the control panel.

It should be noted that the present invention is not limited to the above-described embodiment, but can be applied to various types of mechanical equipment controlled by a relay sequence.

[0028]

According to the present invention, by opening and closing a relay contact,
The operation of the operating device stops during the sequence control of the operating device.
The operation of the relay contacts immediately before the
By based rather determination result in the diagnostic matrix from the rolling elements,
Since the failure level of the operating device is determined to be a minor failure, not only the contact state of the relay contacts but also the minor failure
Or failure level determination is simplified, a single relay opens
Of the multiple relay contacts that close,
One selected relay contact is normal, the other relay
Even if conflicting phenomena such as contact points failing occur,
The failure level can be quickly determined , and a quick response can be realized without depending on a skilled worker .

[Brief description of the drawings]

FIG. 1 is a table for explaining a method of the present invention and showing a diagnostic matrix illustrating an upper limit switch.

FIG. 2 is a table showing a diagnostic matrix illustrating an overcurrent relay;

FIG. 3 is a list showing a diagnostic matrix exemplifying a spindle type switching device;

FIG. 4 is a circuit diagram showing a relay sequence circuit configured based on the diagnostic matrix of FIG. 1;

FIG. 5 is a circuit diagram showing a programmable controller configured based on the diagnostic matrix of FIG. 3;

FIG. 6 is a circuit diagram showing a case where a contact open / closed state detecting device using a high frequency is connected to the relay sequence circuit.

FIG. 7 is a circuit diagram showing a relay sequence circuit configured based on the contact open / closed state detection device of FIG. 6;

[Explanation of symbols]

 1,3 relay sequence circuit 2 programmable controller X1-X3 relay contact D1-D4 contact open / close state detection device

──────────────────────────────────────────────────続 き Continuing on the front page (51) Int.Cl. ⁶ Identification code FIG05B 19/05 N (72) Inventor Yoshiharu Yamada 3-1, Dejima Nishimachi, Sakai City, Osaka Prefecture 1 Inside Sakai Iron Works, Ltd. (56) Reference Reference JP-A-57-5113 (JP, A) JP-A-5-289718 (JP, A) Japanese Utility Model Application No. Sho 60-47008 (JP, U) Japanese Utility Model Application No. Sho 58-148851 (JP, U) Japanese Utility Model Application No. 4- 102127 (JP, U) (58) Field surveyed (Int. Cl. ⁶ , DB name) G05B 23/02 302 G05B 9/02 G05B 19/10 G05B 19/048

Claims (1)

(57) [Claims] 1. Opening and closing with one relay in relation to operating equipment
Of the relay items to be shared,
Compare the open / closed state of the two selected relay contacts and
Using the operation element of the operation device as a criterion, the relay connection
A diagnostic matrix is created in advance that classifies the judgment result based on the open / closed state of the point and the operation element, and when the operation of the operation device is stopped during the sequence control of the operation device by opening and closing the relay contacts, immediately before the stop of the operation Switching status of relay contacts
Based rather determination result to the diagnostic matrix from the fine operating element
An abnormal level determination method for determining an abnormal level of an operating device.