JPS63117815A - Overall controller - Google Patents

Abstract

PURPOSE:To prevent a motor at an on-site circuit from being immediately driven when a central-single-operation-changeover-switch is charged by providing a self-holding circuit which is for making a single-operation-contact-point effective through the charge of a break-contact-point. CONSTITUTION:A central-single-operation-changeover-switch 28 is charged and the first relay R1 is energized and the first relay contact point r1 is made to close. When an on-site changeover switch 30 is changed and a break-control- point 31 is charged, the second relay R2 is magnetized and the second relay R2 is closed. Accordingly, the first relay contact point r1, the second relay contact point r2 and the second relay R2 constitute a series circuit, which becomes a self-holding circuit that keeps energizing the second relay R2. Afterward, even if the break-contact-point 31 is opened by charging the simple- operation-contact-point 29 of the on-site changeover switch 30, the second contact point r2 maintain a closed state, so the simple-operation-contact-point 29 becomes effective. Accordingly, the primary switch 88 is magnetized and a motor starts a single operation.

Description

[Detailed Description of the Invention] Industrial Application Field] This invention relates to a general control device for a conveyor etc. that transports all kinds of raw materials, and in particular, when a central isolated operation changeover switch in a central main circuit is turned on, The present invention relates to a highly safe general control device in which the electric motor does not start immediately.

"Prior Art" FIG. 2 is a circuit diagram, not showing a conventional general control device, as described in, for example, Japanese Patent Publication No. 11652/1982.

In the figure, (1) is a normally open interlock check push button switch, (2) is an interlock changeover switch that is opened when selecting interlock operation, and (3) is an interlock check push button switch (1) and interlock changeover switch. An AND circuit that takes the AND of each signal from switch (2), (4) is an interlocking check signal established by the outputs of circuits 1 to (3), and (5) is established when the operating condition is completed. This is the operating condition completion signal.

(6) is a normally open start pushbutton switch; 7) is an ant circuit that calculates the logical product of each signal from the interlocking changeover switch (2) and the start pushbutton switch (6) and the operating condition completion signal (5); (8) is a normally-closed operation stop push button switch, and (9) is an operation stop signal by each signal from the operation condition completion chair number (5), interlocking changeover switch (2), and operation stop push button switch (8). The NOR circuit that outputs A, (10) is a start-up completion signal indicating that the start-up of a series of devices has been completed, and (11)
) is an OR circuit that calculates the logical sum of the start-up completion signal (10) and the operation stop signal A.

(12) A flip-flop which receives the output signals of the ζJ AND circuit (7) and the OR circuit (11) and outputs the interlock activation signal B. (13) is a flip-flop that is generated by the interlocking start signal B and continues to operate until the operation stop signal from the NOR circuit is input, and its output is the operation/stop signal C.

(14) is an AND circuit (3), (7), and a NOR circuit (9)
, OR circuit (11), flip-flop (12) and (
13) is a central trunk circuit composed of
This central master port Fllr (14) is connected in series to the interlocking changeover switch (2) and a central independent operation changeover switch (<28) which is selectively switched on and off alternately, and to this central independent operation changeover switch (28). When the first relay (R1) is energized by turning on the central islanding selector switch (28), the first relay (R1) is installed in the field circuit (36) to be described later. The first relay contact (r
l).

(15) is the interlock pre-stage equipment signal, (16) is the interlock start signal B and run/stop signal C from the central main circuit (14), and the interlock pre-stage equipment signal (15> and the failure relay (and) described later). Fault signal E from normally closed contact (re)
The ant circuit (17) calculates the AND of the interlock pre-stage equipment signal (15), the operation/stop signal C, and the operation confirmation signal from the normally open contact (88a) of the primary switch (88), which will be described later. This is an AND circuit that performs logical product with the fault signal E. (18) is an OR circuit that takes the logical sum of the output signals of the ant circuits (16) and (17), and outputs the interlocking operation output signal (19) to close the contact (19a). There is.

(20) is a flicker signal (blinking signal), (21) is an AND circuit that takes the logical product of each inverted signal of the operation confirmation signal and failure signal E and the flicker signal (zO), and (22) is a field circuit that will be described later. The interlock selection switch provided corresponding to the motor (not shown) belonging to (36), (23) is the interlock check signal (4) and the signal E and the signal 1 from the interlock selection switch (22). ? Jump) It is an AND circuit that performs logical product. (24) is an OR circuit that calculates the logical sum of the operation confirmation shift 1] and each output signal of the AND circuits (21) and (23), outputs the display output signal (2S), and outputs the display output signal (2S) to the contact (
1 which is designed to close 25a), (26) is the circuit (16), <17), (21) to Anne 1.
, (23), 41 by OR circuits (18) and (24)
There is a motor unit circuit made up of 6 parts, which is not shown in the figure.
A number corresponding to the required number of electric motors are provided, and each is connected to the central main circuit (14).

(36) is a field circuit including a motor unit circuit (26), and in the field circuit (36), contacts (1, 9a) driven by an interlocking operation output signal (19) and an interlocking selection switch (22) are connected. The interlocking operation contact (22a) that is turned on at the same time as the power-on, the primary switch (88) for driving the electric motor belonging to the site entrance I ¥8 (36), and the thermal relay that detects failures such as overload etc. failure detection contact (2
7) A series circuit is formed.

In addition, the series circuit consisting of the contact (19a) and the interlocking operation contact (22a) includes an islanding contact (29) that is turned on after the central islanding switch (28) is turned on, and a central islanding switch (28). A series circuit consisting of a first relay contact ("1") which is closed when the power is turned on is connected in parallel.

Further, a breaking contact (31) is arranged at the intermediate point between the interlocking operation contact (22a) and the individual operation contact (29), and these contacts constitute a field changeover switch (30), such as a rotary switch. It is designed to be selectively input into the following.

Furthermore, when a failure occurs, the failure detection contact (27) moves to the failure relay (RE) side, energizes the failure relay (RE), and opens the normally closed contact (re).

Furthermore, (L) is an indicator light installed in the field circuit (36), and the contact (25a) is closed by the display output signal (25) or by the operation of the wide switch (88). When the normally open contact (88b) is closed, the light is turned on.

In addition, each push button switch (1) in the central main circuit (14),
(6), (8), the interlocking changeover switch (2), and the interlocking selection switch (22) in the motor unit circuit (26).
), a normally open contact (88a) and a normally closed contact ("e") are each connected to a power source.

Next, the operation of the conventional overall control device shown in FIG. 2 will be explained.

When performing general control of a large number of conveyors, etc., first, the interlocking changeover switch (2) of the central main circuit (14) and the interlocking selection switch (22) of the motor unit circuit (26) are closed. At this time, the operation push button switch (8) is closed,
The central independent operation changeover switch (28) and the first relay contact (rl) are opened, the interlocking operation contact (22a) is closed, the normally open contact (88a) is opened, and the fault relay (
The normally closed contact (re) of RE) is closed.

Here, when the push button switch for interlock check (1) is closed and a check is performed, an interlock check signal (4) is generated in the motor unit circuit (26), and the AND circuit (23) and the OR circuit (24) are generated. After that, the display output signal (25) is generated, the contact (25a) is closed, and the indicator light (L> is lit. This lighting indicates that the linked operation is possible, and then the start push button switch 6 is turned on. ) is closed.

At this time, if the activation condition completion signal (5) is established, the interlocking activation signal B and A run/stop signal C is generated and supplied to the motor unit circuit (26) for each device.

Furthermore, if the interlock pre-stage equipment signal (15) is present (failure signal E is not generated), the interlocking operation output signal (19) is output via the AND circuit (16) and the OR circuit (18). occurs, and the contact (19a) is closed.

Then, interlock operation contact (
22a), the primary switch (88) is energized and the electric motor starts to operate in conjunction.

Simultaneously with driving the electric motor, the normally open contacts (88a) and (ssb) are closed by the excitation of the wide switch (88), an operation confirmation signal is generated, and the AND circuit (17) and OR circuit (18) are closed. The interlocking operation output signal (19) is held through the interlocking operation output signal (19), and the indicator light (L) continues to be lit.

When the operation of the electric motor is to be stopped, the operation stop push button switch (8) is opened to cause the NOR circuit (9) to output the operation stop signal A based on the NOR. Then, a run/stop signal C is generated from the flip-flop (13) and inputted to the AND circuit (16) in the motor unit 71 to the circuit (26). This run/stop signal C passes from the AND circuit (16) to the OR circuit (18), opens the primary switch (88), and stops the electric motors belonging to each field circuit (36).

Furthermore, when a failure such as overload occurs, the failure relay (RE) is energized by the operation of the failure detection contact (27) and the normally closed contact (re) is opened, so that the AND circuit (17
) and the interlocking operation output signal (1) via the OR circuit (18).
9) will disappear. Therefore, the excitation of the wide switch (88) is released and the operation of the motor is stopped, and the AND circuit (
21) and the flicker signal (2) via the OR circuit (24).
0) is applied to the indicator light (L), and the indicator light (L) blinks.

On the other hand, the field changeover switch (in the field device 1i'@(36)
30), when operating only a specific electric motor independently,
First, the interlocking changeover switch (2) is opened and the central independent operation changeover switch (28) is turned on, and then the interlocking selection switch (22) is opened and the field independent operation contact (29) is turned on.

Thereby, the field changeover switch (30) is switched from the position of the interlocking operation contact (22a) to the position of the individual operation contact (29). At this time, since the contact (rl) is closed by the energization of the first relay (old), the - wide switch (88
) is excited (turned on), and the electric motor to which this field circuit (36) belongs is operated independently. Also, since the normally open contact (88b) is closed, the indicator light (L) lights up.

In addition, the failure relay (R) is activated by the operation of the failure detection contact (27).
When E) is energized, the first relay contact (rl) is opened, the primary switch (88) is demagnetized, and the independent operation of the motor is stopped.

[Problem to be Solved by the Invention 1] In the conventional general control device, as described in 2 below, the islanding contact (29) is connected in series to the first relay contact (rl). ) is turned on and the motor is stopped, the central independent operation selector switch (28)
When the on-site circuit (36) is turned on, the electric motor of the relevant field circuit (36) suddenly starts operating without any prior notice, which poses a problem of great danger.

This invention was made in order to solve the problems mentioned above, and provides a highly safe general control device in which the electric motor in the field circuit does not start immediately when the central isolated operation changeover switch is turned on. The aim is to obtain.

Means for Solving Problem L] The general control device according to the present invention is provided with a self-holding circuit for enabling the islanding contact by turning on the breaking contact.

[Function] In this invention, even if the central islanding changeover switch is turned on, the islanding contact does not become effective until the breaking contact of the field changeover switch is turned on. An electric motor that is currently stopped will not suddenly start up.

[Example] Hereinafter, an example of the present invention will be described with reference to the drawings. 1st
The figure is a circuit diagram showing one embodiment of the present invention, and (1) to
(31), (88), (R1), (RE), and (L) are similar to those of the conventional device described above. Also, (30A) and (36A> are field changeover switches (30) of the conventional device.
and the field circuit (36), respectively.

(R2) is the first relay contact (rl) and disconnection contact (31)
A second relay (R2) is connected in series to the islanding contact (29) and in parallel to the breaking contact (31), and is closed by excitation of the second relay (R2). These contacts, together with the first relay contact (rl), constitute a self-holding circuit for enabling the islanding contact (29) by turning on the breaking contact (31).

Next, the operation of the embodiment of the present invention shown in FIG. 1 will be explained. Note that the case of interlocking operation is the same as described above, so the description thereof will be omitted.

When performing independent operation of the qt, first turn on the central independent operation changeover switch (Z8), energize the first relay (R1), and switch the first relay contact b1. ) is closed.

At this time, the field changeover switch (30) is set to the island operation contact (
29) is closed, the second relay contact (R
2) is open, the primary switch (88) is not energized.

Next, switch the field changeover switch (30) to disconnect the contact (3).
1), the second relay (R2) is energized and the second relay contact (T.2) is closed. Therefore, the first relay contact (Rl), the second relay contact (R2) and the second relay (R2) constitute a series circuit, and the second relay (R2)
It becomes a self-holding circuit that continues to energize.

After that, the standalone operation contact (2) of the field changeover switch (30)
9) is closed and the breaking contact (31) is opened, the second contact (R2) remains closed, so the islanding contact (29) remains valid. Therefore, the primary switch (88) is energized and the electric motor starts to operate on its own. Also, at this time, the indicator light (L) lights up due to the closing of the normally open contact (88b) to indicate that the motor is being driven.

- To demagnetize the second relay (R2), which has been self-held, turn on the interlocking start switch (2), open the central independent operation changeover switch (2B), and open the first relay contact (rl).
All you have to do is open it.

[Effects of the Invention] As described above, according to the present invention, a self-holding circuit is provided to enable the islanding contact by turning on the breaking contact,
Even if the central islanding switch is turned on, the islanding contact will not become effective until the break contact of the field changeover switch is turned on. The electric motor does not suddenly start up, which has the effect of providing a highly safe overall control device.

[Brief explanation of the drawing]

FIG. 1 is a circuit diagram showing an embodiment of the present invention, and FIG. 2 is a circuit diagram showing a conventional overall control device. (14)...Central main circuit (26)...Motor unit circuit (28)...Central 11LL independent operation selector switch (29)
)...Independent operation contact (30)...Field changeover switch (31>...Disconnection contact (36A)...Field circuit (88)...Primary switch (R1)...First relay ( R2)...Second relay (rl)...
- First relay contact (R2)...Second relay contact In the drawings, the same reference numerals indicate the same or equivalent parts.

Claims (2)

[Claims] (1) Comprising a central main circuit and a field circuit having a plurality of motor unit circuits connected to the central main circuit,
In the overall control device that operates the electric motors belonging to the on-site circuits in interlocking operation, independent operation, or stopping based on a plurality of changeover switches provided in each of the central master circuit and the on-site circuit, the electric motors in the on-site circuit a primary switch for driving the motor; a field changeover switch connected in series to the primary switch and having a disconnection contact and an island operation contact for selecting the operating state of the motor; A general control device characterized by being provided with a self-holding circuit for activating operating contacts. (2) The self-holding circuit includes a first relay contact that is connected in series to the breaking contact in the field changeover switch and is closed when the central island operation changeover switch in the central main circuit is turned on, and a first relay contact that is connected in series to the breaking contact in the central main circuit. a second relay contact connected in series to the islanding contact in the on-site changeover switch and in parallel to the breaking contact, and closed by energization of the second relay. An overall control device according to claim 1, characterized in that: