JPH04317595A - Overall controller - Google Patents

Abstract

PURPOSE:To provide an overall controller for a plurality of motors in which the number of total output signals of a programmable controller can be reduced by half as compared with that of prior art. CONSTITUTION:An interlock check signal 4, an interlock start signal B, an operation.stop signal C to be generated from a central master circuit 14A, and trouble detection signals 20, E to be generated from a trouble detector are obtained through AND circuits 34, 17, 21 of a plurality of motor unit circuits 26A, a contact 33a is closed based on an output signal 33 obtained by inputting the signals to an OR circuit 32 to light a display lamp L. A relay R2 is operated by the signal B to close a contact r2, and a primary switch 88 is excited to drive the corresponding motor. The case in which the lamp L is merely lit and the switch 33 is not excited of conditions that the signal 32 is outputted, includes an interlock check time and a trouble time. On the contrary, the case in which the switch 88 is excited, includes only the interlock operation time. Accordingly, the display and the excitation of the switch 88 are conducted by using one output signal.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a general control device for comprehensively controlling a large number of electric motors that drive devices such as a large number of conveyors for transporting raw materials and the like.

0002

[Prior Art] Fig. 2 shows, for example, the Japanese Patent Publication No. 60-11652
FIG. 2 is a circuit diagram showing a conventional general control device described in the publication. In the figure, 1 is a normally open interlock check push button switch, 2 is an interlock changeover switch that is closed when selecting interlock operation, and 3 is the logic of each signal from interlock push button switch 1 and interlock changeover switch 2. AND circuit that takes products, 4
5 is an interlock check signal established by the output of the AND circuit 3, and 5 is an operating condition completion signal established by completion of the operating condition. 6 is a normally open start pushbutton switch; 7 is an AND circuit that takes 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 pushbutton switch; 9 is the operating condition completion signal 5
and a Noah circuit that outputs an operation stop signal A according to each signal from the interlocking changeover switch 2 and the operation stop push button switch 8;
Reference numeral 10 denotes a start-up completion signal indicating that the start-up of a series of devices such as a large number of conveyors has been completed, and 11 is an OR circuit that takes the logical sum of the start-up completion signal 10 and the operation stop signal A.

Reference numeral 12 denotes a flip-flop which receives the output signals of the AND circuit 7 and the OR circuit 11 and outputs an interlock activation signal B. Reference numeral 13 denotes a flip-flop which generates an output in response to the interlocking start signal B and continues operation until the operation stop signal from the NOR circuit 9 is input, and its output becomes the operation/stop signal C. Reference numeral 14 denotes a central main circuit composed of AND circuits 3 and 7, a NOR circuit 9, an OR circuit 11, and flip-flops 12 and 13. The central circuit 14 further includes a central independent operation changeover switch 28 that is selectively switched on and off alternately with the interlocking changeover switch 2, and a first relay R1 connected in series to the central independent operation changeover switch 28. It is. When the first relay R1 is energized by turning on the central independent operation changeover switch 28, it closes a first relay contact r1 provided in a field circuit 36, which will be described later.

15 is a pre-interlock device signal; 16
is an AND circuit 17 which calculates the logical product of the interlocking start signal B and operation/stop signal C from the central main circuit 14, the interlock pre-stage equipment signal 15, and the failure signal E from the normally closed contact re of the failure relay RE, which will be described later. are the interlock pre-stage equipment signal 15, the operation/stop signal C, and the primary switch 88, which will be described later.
This is an AND circuit that takes the logical product of the operation confirmation signal D from the normally open contact 88a and the failure signal E. 18 is AND circuit 1
This is an OR circuit that calculates the logical sum of the output signals 6 and 17, and outputs the interlocking operation output signal 19 to close the contact 19a. 20 is a flicker signal (blinking signal)
, 21 is an AND circuit that calculates the logical product of each inverted signal of the operation confirmation signal D and the failure signal E and the flicker signal 20, and 22 is provided corresponding to a motor (not shown) belonging to a field circuit 36 to be described later. The interlock selection switch 23 is an AND circuit that performs a logical product of the interlock check signal 4, the failure signal E, and the signal F from the interlock selection switch 22. 24 is an OR circuit which takes the logical sum of the operation confirmation signal D and each output signal of the AND circuits 21 and 23, and outputs a display output signal 25 to close the contact 25a. 26 are AND circuits 16, 17, 21, 23, OR circuits 18 and 24
This is a motor unit circuit configured by Although not shown, the motor unit circuits 26 are provided in a number corresponding to the required number of motors, and are each connected to the central main circuit 14.

Reference numeral 36 is a field circuit including the motor unit circuit 26. In this field circuit 36, a contact 19a is driven by the interlock operation output signal 19, and an interlock operation contact 22 is turned on at the same time as the interlock selection switch 22 is turned on.
a, a primary switch 88 for driving an electric motor (not shown) belonging to the field circuit 36, and a failure detection contact 27 such as a thermal relay for detecting failures such as overload. There is. 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 changeover switch 28 is turned on, and a first relay that is closed when the central islanding operation changeover switch 28 is turned on. A series circuit consisting of contact r1 is connected in parallel. Furthermore, the interlocking operation contact 22a and the individual operation contact 2
A disconnection contact 31 is disposed at an intermediate point between the contact point 9 and the contact point 9, and these contacts 22a, 29, and 31 constitute an on-site changeover switch 30, which can be selectively turned on or off like a rotary switch, for example. There is.

When a failure occurs, the failure contact 27 moves to the failure relay RE side, energizes the failure relay RE, and opens the normally closed contact re. Further, L is an indicator light installed in the field circuit 36, and the display output signal 25
The contact 25a is closed or the primary switch 88
When the normally open contact 88b is closed by the operation of , the light is turned on. Note that the pushbutton switches 1, 6, 8 and the interlocking changeover switch 2 in the central master circuit 14, the interlocking selection switch 22, the normally open contact 88a, and the normally closed contact re in the motor unit circuit 26 are each connected to a power source. .

Next, the operation will be explained. When performing overall control of a large number of conveyors, etc., first, the interlocking changeover switch 2 of the central master circuit 14 and the interlocking selection switch 22 of the motor unit circuit 26 are closed. At this time, the run/stop push button switch 8 is closed, and the central independent operation changeover switch 2
8 and the first relay contact r1 are open, the interlocking operation contact 22a is closed, the normally open contact 88a is open, and the normally closed contact re of the failure relay RE is closed. Here, when the interlock check pushbutton switch 1 is closed and a check is performed, an interlock check signal 4 is generated and input to the motor unit circuit 26, and the display output signal 25 is generated via the AND circuit 23 and the OR circuit 24. Then, the contact 25a is closed and the indicator light L is turned on. After this lighting indicates that linked operation is possible, the start push button switch 6 is closed.

At this time, if the starting condition completion signal 5 is established, the AND circuit 7, the NOR circuit 9, the OR circuit 11,
Interlocking activation signal B via flip-flops 12 and 13
A run/stop signal C is generated and supplied to the motor unit circuit 26 of each device. Furthermore, if the interlock pre-device signal 15 exists (failure signal E is not generated), the AND circuit 16 and the OR circuit 18
After that, the interlocking operation output signal 19 is generated and the contact 19a is closed. Then, the primary switch 88 is energized via the interlock operation contact 22a in the field changeover switch 30, so that each electric motor starts interlock operation. At the same time as the motor is driven, the normally open contacts 88a and 88b are closed by the excitation of the primary switch 88, and the operation confirmation signal D is generated.
is held and the indicator lamp 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, the operation stop signal C is generated from the flip-flop 13 and inputted to the AND circuit 16 in the motor unit circuit 26. This operation 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. The signal 19 is extinguished. Therefore, the excitation of the primary switch 88 is released and the operation of the electric motor is stopped, and at the same time, the flicker signal 20 is applied to the indicator lamp L via the AND circuit 21 and the OR circuit 24, and the indicator lamp L blinks.

On the other hand, when only a specific motor is operated independently using the field changeover switch 30 in the field circuit 36, 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 2 is turned on. 22 is opened and the on-site independent operation contact 29 is connected. This results in
The field changeover switch 30 is switched from the position of the interlocking operation contact 22a to the position of the independent operation contact 29. At this time, the first
Since the contact r1 is closed by the energization of the relay R1, the primary switch 88 is energized, and the electric motor belonging to this field circuit 36 is operated independently. Further, since the normally open contact 88b is closed, the indicator light L is lit. Further, when the failure relay RE is energized by the operation of the failure detection contact 27,
The first relay contact r1 is opened, the primary switch 88 is demagnetized, and the independent operation of the motor is stopped.

[0011]

[Problems to be Solved by the Invention] Since the conventional comprehensive control device is configured as described above, three or more input signals B, C to F,
4 and two output signals 19, 25 are present. When a programmable controller is applied to such general control, there is a problem in that the price increases if the number of input/output signals is large.

The present invention was made to solve the above-mentioned problems, and provides an economical comprehensive control that can reduce the number of output signals from the motor unit circuit of each device and still perform the same functions. The purpose is to provide equipment.

[0013]

[Means for Solving the Problems] The overall control device according to the present invention provides an interlocking operation when only the indicator light is turned on and the coil of the primary switch is not excited, among the conditions under which the interlocking operation output signal is output. Since the coil of the primary switch is excited only during interlock operation, the interlock check circuit, failure detection circuit, and interlock operation control circuit are configured separately, and the output of these circuits is is passed to an OR circuit at the final stage, and a display signal is obtained from the output signal of this OR circuit.

[0014]

[Operation] In the general control device of the present invention, the display signals that were conventionally output from the motor unit circuit of each device are reduced, and in the motor unit circuit of each device, the display output of each device is generated from the interlocking operation output signal. do.

[0015]

【Example】

Example 1. An embodiment of the present invention will be described below with reference to the drawings. In FIG. 1, parts corresponding to those in FIG. 2 are denoted by the same reference numerals, and explanations thereof will be omitted. In FIG. 1, 12a is a contact that excites the second relay R2 when the interlock start signal B is output, and 34 is a contact that excites the second relay R2 when the interlock start signal B is output, and 34 is a negative signal of the interlock start signal B, an interlock check signal 4, and a failure signal E from the normally closed contact re. AND circuit 32 is AND circuit 34, 16, 17
This is an OR circuit that calculates the logical sum of each output signal of 21 and 21, and outputs an interlocking operation output signal 33 to close the contact 33a, and the interlocking operation output signal 33 is sent to the field circuit 36A. . 26A is a motor unit circuit for each device.

Field changeover switch 30 in field circuit 36A
Interlocking selection contact 22a and on-site independent operation selection contact 2
Further, a series circuit of the primary switch normally open contact 88b, the normally closed contact reb of the failure relay RE, the primary switch 88, and the failure detection contact 27 is connected in parallel with the indicator light L from the switching point 9. Further, contacts r1 and r2 of the central independent operation switching relay R1 and start signal relay R2 are connected in parallel to the contact of the primary switch 88b. The rest of the configuration is the same as that of the overall control device shown in FIG. In addition, 1, 2,
3, 34, etc. constitute an interlocking check circuit, and 5 to 1
3, 15 to 17, 88a, 88b, etc. constitute an interlocking operation control circuit, and 20, 21, 27, RE, rea, r
eb constitutes a failure detection circuit, and 12a, R2
, r1, etc. constitute a connection means. Also, E,20
A failure detection signal is constructed by:

Next, the operation will be explained. In the interlock check, when the push button switch 1 is pressed, the output signal of the AND circuit 34 is obtained as the interlock operation output signal 33 via the OR circuit 32 when no failure signal is issued, and the contact 33a is thereby closed. Indicator light L lights up. Start push button 6
When interlocking start signal B is generated, AND circuit 3
Although the output No. 4 is not generated, since the conditions of the AND circuit 16 are satisfied, an output signal is generated and the indicator lamp L is lit. Further, since the contact r2 of the starting signal relay R2 is also closed, the primary switch 88 is turned on and is self-held by the contact 88b.

When stopping the operation, by pressing the push button switch 8, the operation stop signal C disappears, and the AND circuits 31, 16, 17, and 21 all lose their output signals, so the interlocking operation output signal 33 is turned OFF. Become. Therefore,
The contact 33a opens, the indicator light L goes out, and the primary switch 8
Coil No. 8 is also de-energized and the motor stops. When a failure occurs, failure detection contact 27 operates and failure relay R is activated.
E operates to open contacts reb and rea, turning off the primary switch 88, and transmitting the flicker signal 20 as the interlocking output signal 33 to the field circuit 36A via the AND circuit 21, causing the indicator light L to blink. Notify of malfunction. When performing solo operation, open the interlock switch 2, turn on the central solo operation changeover switch 28, and then turn on the field changeover switch 3.
When 0 is input to the field independent operation selection contact 29, the first relay R1 is also energized, so the contact r1 closes and the indicator light L is turned on. In addition, the primary switch 88 is also energized and can operate independently.

[0019]

As described above, according to the present invention, the interlock check circuit, failure detection circuit, and interlock operation control circuit are configured separately, and the outputs of these circuits are connected to the OR circuit at the final stage. Since the display signal is obtained from the output signal of the circuit, it is possible to reduce the number of output signals output from each motor unit circuit, which has the effect of easily realizing programmable control at low cost. can get.

[Brief explanation of the drawing]

FIG. 1 is a configuration diagram of a general control device according to an embodiment of the present invention.

FIG. 2 is a configuration diagram of a conventional overall control device.

[Explanation of symbols]

1 Interlock check push button switch 2 Interlock changeover switch 3 AND circuit 4 Interlock check signal 5 Operating condition completion signal 6 Start push button switch 7 AND circuit 8 Operation stop push button switch 9 NOR circuit 10 Start completion signal 11 OR circuit 12 Flip-flop 12a Contact 13 Flip-flop 14A Central main circuit 15 Interlock pre-stage equipment signal 16 AND circuit 17 AND circuit 20 Flicker signal 21 AND circuit 27 Failure detection contact 32 OR circuit 33 Interlocking operation output signal 34 AND circuit 88 Primary switch 88a Normally open contact 88b Normal Open contact RE Fault relay rea Contact reb Contact R2 2nd relay r2 Contact L Indicator light

Claims (1)

[Claims] 1. A plurality of primary switches for respectively driving a plurality of electric motors; an interlock check circuit that checks whether or not the plurality of electric motors can be operated in an interlocked manner and outputs an interlock check signal when the interlocked operation is possible; An interlocking operation control circuit that outputs an interlocking start signal for starting the interlocking operation and a run/stop signal for interlocking operation and stopping, and an interlocking operation control circuit that detects a failure for each electric motor and outputs a failure detection signal and responds accordingly. A failure detection circuit that de-energizes the primary switch, an OR circuit into which the interlock check signal, interlock start signal, run/stop signal, and failure detection signal are input, and the output signal of the OR circuit performs display. A general control device comprising: a display means; and a connecting means which is operated by the interlocking activation signal and connects a corresponding primary switch to a power source to flow an excitation current.