JPH05289718A - Operation sequence temporary restoring device - Google Patents

Abstract

PURPOSE:To temporarily restore an operation sequence in a quick and sure way by discriminating automatically a relay contact corresponding to the area of a defect and bypassing the relay contact with use of a simple means. CONSTITUTION:In a sequence control circuit 1 which contains plural relay contacts 3a-3f connected in series and performs the open/close control of a floodgate, for example, based on the closed states of the relay contacts 3a-3f, a temporary restoring short circuit relay is provided to detect the open contacts 3a-3f by the contact open/close state detecting circuits 18a-18f connected in parallel to the contacts 3a-3f. In such a constitution, the open contacts 3a-3f are bypassed with the short circuit of the temporary restoring short circuit relay and the circuit 1 can be quickly and surely operated if a typhoon or a flood occurs and the circuit 1 is defectively operated due to the open states of the contacts 3a-3f.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an operation sequence temporary restoration device, for example, for temporarily restoring an operation failure state in a sequence control circuit for controlling the opening and closing of a floodgate used for power generation, water utilization, water discharge, tide protection, etc. The present invention relates to an operation sequence temporary restoration device.

[0002]

2. Description of the Related Art For example, as shown in FIG. 3, a sequence control circuit (1) for controlling the opening and closing of a floodgate used for power generation, water use, water discharge, tide protection, etc.
Multiple relay contacts (3a) to (3f), operation switch (4)
And the coil (6) of the load driving relay (5) are connected in series, and the relay contact (7) of the load driving relay (5) is connected to, for example, a driving motor that opens and closes a water gate. There is. Each of the relay contacts (3a) to (3f) is an interlock contact such as a limit switch arranged at a predetermined position for controlling the opening and closing of the water gate, and the water gate can be operated when all are in a closed state.

In such a water gate sequence control circuit (1), when the operator turns on the operation switch (4) so that the above limit switches are normal and the water gate can be operated, all relays are operated. Contact (3a) ~ (3
Since f) is in the closed state, a current flows through the coil (6) of the load drive relay (5) to activate it, and its relay contact (7) is also in the closed state and connected to that relay contact (7). The sluice gate drive motor is rotated to open and close the sluice gate.

By the way, when the floodgate is a dam gate, especially a spillway gate, its mission requires that the floodgate quickly and surely perform a predetermined operation in an emergency such as a typhoon or flood. However, due to various factors such as a defective limit switch, defective contact at the contact part, interlock operation, etc., the relay contacts (3a) to (3f) corresponding to the defective location will be in the open state, and it will be an emergency. The lock may not be able to be operated quickly and reliably. This was a particularly serious problem because it could lead to a large secondary disaster in the event of an emergency such as a typhoon or flood.

When the operation failure of the water gate is caused by the sequence control circuit (1) as described above, there is a time limitation in an emergency, so it is necessary to take an appropriate means for temporary restoration. is there. Therefore, in the past, as shown in FIG.
As shown in (4), a method is used in which the relay contact [(3a) in the figure] that is in an open state corresponding to the location of the defect is bypassed by the jumper wire (8).

[0006]

[Problems to be Solved by the Invention] By the way, relay contacts (3a) to (3
In the means of bypass (f), an operator usually detects the defect occurrence point, determines the failure occurrence point and the corresponding relay contact (3a) to (3f) based on the sequence diagram, and then jumper wire (8 ) Is the work of connecting. In this case, the operator is required to detect the location of the defect, determine the relay contact (3a) to (3f) corresponding to the location of the defect,
Also, electrical construction technology such as jumper wire (8) connection and technology for reading sequence diagrams are required. Therefore, in such a site, a specialized electrician who is skilled in the above-mentioned work must be on standby at all times, and depending on the worker, temporary restoration work cannot be performed easily. It was In addition, there is a fatal problem that the above-mentioned electric engineer may not be present depending on the site, and temporary restoration work cannot be performed.

Therefore, the present invention has been proposed in view of the above problems, and an object thereof is to automatically discriminate a relay contact corresponding to a defective portion, and based on the discrimination result, the relay contact. It is an object of the present invention to provide an operation sequence temporary restoration device capable of performing quick and reliable temporary restoration by bypassing the above with a simple means.

[0008]

As a technical means for achieving the above object, the present invention provides a sequence control circuit in which a plurality of relay contacts are connected in series and a load is controlled by the closed state of all the relay contacts. A short-circuit relay for temporary restoration is provided, which is connected in parallel to each relay contact, detects a relay contact in an open state by a contact open / close detection circuit, and then closes based on the detection output.

Further, it is desirable that the sequence control circuit controls the opening and closing of the water gate.

[0010]

In the operation sequence temporary restoration device according to the present invention, when an operation failure occurs in the sequence control circuit, the contact opening / closing detection circuit automatically detects the relay contact corresponding to the failure occurrence location, and detects the contact opening / closing. The short circuit relay for temporary restoration connected to the relay contact in the open state is automatically closed based on the detection output of the circuit, and the relay contact in the open state is bypassed by the short circuit relay for temporary restoration. As a result, even if driving failure occurs in an emergency,
Temporary restoration work can be performed quickly and reliably with simple operations.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a driving sequence temporary restoration device according to the present invention will be described with reference to FIGS. In the following embodiments, the case where the present invention is applied to a sequence control circuit that controls the opening and closing of a water gate will be described, and the same or corresponding portions as those in FIGS. 3 and 4 will be denoted by the same reference numerals and redundant description will be omitted.

A feature of the present invention is that in the sequence control circuit (1) [see FIG. 3] for controlling the opening and closing of the water gate, a plurality of relay contacts (3a) connected in series as shown in FIG.
The short-circuit relays (11a) to (11f) for temporary restoration are connected in parallel to (3f). This short circuit relay (11a) ~ (11
f) is composed of short-circuit relay contacts (12a) to (12f) and short-circuit relay coils (13a) to (13f), respectively.
After detecting (12f), it closes based on the detection output.

Concretely, the overall circuit configuration of the temporary restoration device of the present invention is as shown in FIG. 2, a relay section (14), a detection section (15), a determination section (16) and a display section (17). Composed of.

The relay section (14) is composed of the short circuit relay contacts (12a) to (12f) of the short circuit relays (11a) to (11f), which are the features of the present invention, and are sequence-controlled via the input relay terminal. Circuit (1) relay contact (3a) ~
The short circuit relay contacts (12a) to (12f) are connected in parallel to (3f).

The detection section (15) has a short-circuit relay contact (12a).
~ (12f) contact opening and closing detection circuit (18a) ~ (18
f) and output circuits (19a) to (19f) connected to the contact opening / closing detection circuits (18a) to (18f). The contact opening / closing detection circuits (18a) to (18f) were previously proposed by the applicant of the present invention (Japanese Patent Application No. 3-12808), and the relays are in an open state due to an abnormality in the sequence control circuit (1). The contacts (3a) to (3f) are automatically detected. The output circuits (19a) to (19f) are the contact opening / closing detection circuit (18a).
A predetermined output signal is transmitted based on the detection output of (18f).

The determination unit (16) determines the relay contacts (3a) to (3f) in the open state based on the output signals from the output circuits (19a) to (19f) of the detection unit (15), The relay coil (13a) of the short-circuit relays (11a) to (11f) corresponding to the relay contacts (3a) to (3f) in the open state according to the determination result.
To (13f), which comprises a decision circuit (20) for sending an output signal. In the figure, (21) is a push button for temporary restoration which is connected to the judging circuit (20) and is provided on the operation panel of the sequence control circuit (1).

The display section (17) is composed of a panel display unit (22) consisting of a display circuit and a display panel, and the sequence control circuit (1) simply shows the operating status of the water gate, the presence / absence of an abnormal state and the location thereof. Display with a layout and contents that are easy to understand.

Next, the operation of the temporary restoration device having the above configuration will be described below.

For example, in a sequence control circuit (1) for controlling the opening and closing of a floodgate such as a spillway gate, in the event of an emergency such as a typhoon or flood, the floodgate is operated quickly and reliably by a predetermined operation. Regardless of what must be done, if the water gate is not operating properly due to various factors such as a defective limit switch, poor contact at the contact part, or interlock operation, the operator operates the sequence control circuit (1). Temporary recovery push button (2
Turn on 1).

Here, among the relay contacts (3a) to (3f) that should be all closed in the normal operation state, the relay contacts (3a) to (3f) corresponding to the above-mentioned defective point are shown in FIG. Only (3a)] shown in is open. Therefore, when the temporary recovery push button (21) is turned on, the contact opening / closing detection circuits (18a) to (18f) automatically detect the relay contacts (3a) to (3f) in the open state. That is, in the contact opening / closing detection circuits (18a) to (18f), if the relay contacts (3a) to (3f) are normally closed, the relay of the sequence control circuit (1) is relayed via the relay section (14). The signals sent to the contacts (3a) to (3f) return through the closed loop, but if the relay contacts (3a) to (3f) are in the open state, the sent signal does not return. Whether or not the relay contacts (3a) to (3f) are open is detected by the presence or absence of feedback of this signal.

In this way, the contact opening / closing detection circuit (18a)
Output circuit (19a) to (19f) for detecting output from (18f)
Output from the panel display unit (22) of the display section (17)
In addition to displaying it, the determination circuit (2) of the determination unit (16)
0) discriminates the relay contacts (3a) to (3f) in the open state and calculates the logical product with the temporary restoration push button (21), and based on the result, the relay contacts (3a) to (3f) The output signal is sent to the short-circuit relay coils (13a)-(13f) of the corresponding short-circuit relays (11a)-(11f), and the short-circuit relay (11a) corresponding to the relay contacts (3a)-(3f) in the open state.
The short circuit relay contacts (12a) to (12f) of (11f) ((12a) shown by the broken line in FIG. 1) are closed. This short-circuit relay contact (1
Sequence control circuit (1) by closing 2a) to (12f)
The relay contacts (3a) to (3f) in the open state in 1 are bypassed, the sluice can be operated, and temporary restoration can be performed quickly and reliably.

In the above embodiment, the sequence control circuit for controlling the opening and closing of the floodgate such as the floodgate has been described, but the present invention is not limited to this and can be applied to other sequence control circuits. Of course.

[0023]

According to the temporary restoration device according to the present invention, the relay contacts connected in parallel to each other are detected by the contact opening / closing detection circuit and then closed based on the detection output. By providing a short circuit relay for recovery,
For example, in a sequence control circuit that controls the opening and closing of a floodgate such as a spillway gate, even if an operation failure occurs in an emergency such as when a typhoon or flood occurs, a skilled expert in electrical construction technology or technology that reads sequence diagrams The temporary restoration work can be performed quickly and surely by a simple operation by a general worker without the need for a specialized electrician.
As a result, a large secondary disaster can be prevented in advance, and safety can be dramatically improved.

[Brief description of drawings]

FIG. 1 is a circuit diagram of essential parts showing an embodiment of an operation sequence temporary restoration device according to the present invention.

FIG. 2 is a circuit diagram showing an overall configuration of an operation sequence temporary restoration device of the present invention.

FIG. 3 is a circuit diagram showing an example of a sequence control circuit for a floodgate.

FIG. 4 is a circuit diagram of a main part showing a state in which a jumper wire is connected to a relay contact corresponding to a location where the malfunction occurs when the malfunction occurs in the sequence control circuit of FIG. 3;

[Explanation of symbols]

 1 Sequence control circuit 3a to 3f Relay contact 11a to 11f Short circuit relay for temporary restoration 18a to 18f Contact open / close detection circuit

Claims (2)

[Claims] 1. A relay contact in which a plurality of relay contacts are connected in series, and a sequence control circuit for controlling a load by closing all the relay contacts is connected in parallel to each relay contact and is open in a contact opening / closing detection circuit. A temporary recovery device for an operation sequence, which is provided with a short-circuit relay for temporary recovery, which is closed based on the detection output of the detected current. 2. The sequence control circuit according to claim 1,
An operation sequence temporary restoration device, which is an operation sequence for controlling the opening and closing of a water gate.