JPH09218702A - Operation controller with stop operation diagnostic function - Google Patents

Abstract

PROBLEM TO BE SOLVED: To diagnose welding in the contact of an operation stop relay even at a job site where strong noise is frequently produced serially connecting a relay circuit to excite an operation relay to the serial circuit of the operation stop relay contact and the operation relay. SOLUTION: The relay circuit exciting the operation relay CRX for the first time when the contact of the operation stop relay CRY is opened once and, then, closed again at every on-operation of an operation start switch PB2 is serially connected to the serial circuit of the operation stop relay CRY contact and the operation relay CRX. The contact of the operation stop relay CRY is not operated to be opened once and, then, closed again in spite of the on- operation of the operation start switch PB 2 when the operation stop relay CRY contact is welded so that the operation of a controlled device is not started. Thus, welding in the contact of the relay CRY is easily diagnosed.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention checks whether or not a contact of an operation stop relay for stopping the operation of a controlled device is welded. If the contact is welded, an operation start switch is operated. Even if the operation of the device is not started and the contacts are not welded, the operation control device with the stop operation diagnosis function starts the operation of the device by operating the operation start switch.

[0002]

2. Description of the Related Art Conventionally, as shown in FIG. 13, a normally closed operation stop switch PB1 is connected in series to an operation stop relay CRY for stopping the operation of a device (not shown), and this operation is performed. The A contact of the stop relay-CRY and the normally open operation start switch PB2 are connected in series to the coil of the operation relay CRX, and the A contact of the operation relay CRX is connected to the operation start switch PB2. An electric circuit which is connected in parallel with the self-holding circuit of the operating relay-CRX is used in the operation control device.

As shown in the timing chart of FIG. 14, when the electric circuit is powered on, the operation stop switch PB1 is of the normally closed type, so that the operation stop relay CRY is used.
Is excited. When this relay CRY is excited, the relay
The contact A of CRY is closed, and in this state the operation start switch P
When B2 is turned on, the driving relay CRX is excited, and the relay connected in parallel to the driving start switch PB2.
Since the A contact of CRX is closed, a self-holding current flows through the A contact, and the relay CRX is continuously excited. As a result, the magnet switch or the like on the side of the controlled device that is actuated when the relay CRX is excited is actuated, and a drive current is supplied to the motor or the like of the device by the actuation of this magnet switch or the like.

When the operation of the controlled device is stopped, when the operation stop switch PB1 is pushed, the excitation of the relay CRY is released and the A contact of the relay CRY is opened as shown in the timing chart of FIG. Then, the excitation of the relay-CRX is released. As a result, the operation of the magnet switch or the like is released, and the supply of the drive current to the motor or the like of the device is stopped.

[0005]

DISCLOSURE OF THE INVENTION Problems to be Solved by the Invention
When the A contact of CRY is welded due to overcurrent or the like, the A contact of the relay CRY becomes conductive regardless of whether it is excited or not. Therefore, as shown in FIG. 15, the power supply voltage is directly applied to the operation start switch PB2. When the power is turned on in this state, the relay CRY is excited at the same time as the power is turned on as shown in the timing chart of FIG. 16, while the relay CRX is excited when the operation start switch PB2 is turned on. The A contact of the relay CRX connected in parallel with the operation start switch PB2 is closed, and the self-holding current flows through the A contact. In the above state, when the operation stop switch PB1 is pressed to stop the operation of the controlled device, the excitement of the relay-CRY is released, but the relay A-contact of the relay-CRY is welded. -CRX
There is a problem that the excitation of the device is not released and the operation of the device is not stopped.

As described above, when the contact of the relay for operation stop is welded, the operation of the controlled device is not stopped. Therefore, as a technique for detecting whether the contact of the relay is welded or not. Japanese Patent Laid-Open No. 3-90869 has been proposed. According to the "relay welding detection method" described in the above publication, a programmable
Although the contact welding of the relay is detected by using a controller, since the CPU is generally used as a central function in the programmable controller, for example, a welding robot that emits a welding spark is equipped. If the welding detection means of the relay using the programmable controller is adopted at a site where a strong noise generating device such as a high frequency heating device and a crane device is installed,
Since a malfunction is likely to occur due to the influence of noise and the welding of the relay cannot be accurately detected, the programmable controller with the built-in CPU cannot often be used as the welding detection means of the relay.

Therefore, in the present invention, a stop operation diagnosis function is provided which is capable of diagnosing the welding of the contact of the operation stop relay even at a site where a lot of strong noise is generated without using a CPU which is easily affected by external noise. The main issue is to provide an operation control device, and the operation control device with stop operation diagnosis function is unitized so that it can be assembled to any device, and it can be arbitrarily added to support the expansion of control target devices. Is a subordinate issue.

[0008]

According to the present invention, as means for solving the above-mentioned problems, an operation control device with a stop operation diagnosis function is provided, which has a contact for an operation stop relay CRY and an operation relay CR.
Each time the operation start switch is turned on, the relay circuit in which the operation relay CRY is excited is serially connected to the X series circuit every time the contact for the operation stop relay CRY is once opened and then closed again. It is to make a connected circuit configuration.

According to this circuit configuration, the relay for operation stop is
When the contact of CRY is welded, even if the operation start switch is turned on, the contact of the operation stop relay-CRY does not open and then close again, so the operation relay CRX is not excited, The operation of the controlled device is not started because it does not operate. Therefore, it can be easily diagnosed that the contacts of the relay-CRY are welded.

Further, in the above-described operation control device with stop operation diagnosis function, the first check relay-CRA is connected in series to the operation start switch, and the B contact of the first check relay-CRA is stopped. Relay relay CRY and a second check relay CRB connected in series to the operation start switch and a B contact of the operation stop relay CRY.
And the A contact of the second check relay-CRB are connected in series to the operation stop relay CRY, and the operation stop relay CRY is connected to the A contact of the operation stop relay CRY. The A contact of the first checking relay-CRA and the A contact of the second checking relay-CRB may be connected in series.

According to the above circuit configuration, the relay for stopping the operation is
When the A contact of CRY is welded, when the operation start switch is turned on, the first check relay CRA is excited, and the B contact of the relay CRA connected in series to the operation stop relay CRY. Is released and the excitation to the relay CRY is released, but since the contact A of the relay CRY is welded, the contact B of the relay CRY connected in series with the second check relay CRB is opened. Releasing because it remains
CRB is not excited. Therefore, the driving relay-CRX
Of the relay CRY A contacts, relay CRA A contacts, and relay CR B A contacts connected in series with respect to the relay CR B, the relay C CR A contacts do not close, so the relay CRX is not excited, Since the operation of the controlled device is not started,
The welding of the A contact of the relay-CRY can be easily diagnosed. When the B contact of the operation stop relay-CRY is welded, the A contact of the operation stop relay-CRY connected to the operation stop relay CRX does not close, so the operation start switch is turned on. However, the driving relay-CRX is not excited.

The operation control device with the stop operation diagnosis function may be unitized and installed in any device, and a check switch or the like for performing a diagnostic check at the start of operation or during operation may be connectable.

According to the operation control device with the stop operation diagnosis function, since it is unitized, it can be easily incorporated into any control target device, and a check switch can be connected. Therefore, at the start of operation or during operation. The abnormality in can be easily detected.

Further, a safety relay having a forcible dissociation mechanism of contacts is used for the operating relay CRX, and the relay C
The B contact of RX may be connected in series with the start switch.

By using a safety relay having a mechanism for forcibly dissociating the contacts in the operating relay CRX as described above, when the contacts of the relay CRX are welded, the other contacts are forcibly dissociated. Therefore, the operation of the controlled device can be stopped, and the operation of the controlled device can be stopped when the contacts of the relay-CRX are welded after the operation is started.

Further, the number of circuits for exciting the second checking relay CRB may be increased by an extension unit.

As described above, the second checking relay CR
By increasing the number of circuits for exciting B with the additional unit, even if the number of operation start conditions of the controlled apparatus is large, a large number of these operation start condition circuits can be incorporated.

[0018]

Next, an embodiment of the present invention will be described. FIG. 1 is an electric circuit diagram showing a first embodiment of an operation control device with a stop operation diagnosis function. The configuration and operation of this electric circuit will be described below. When a power switch (not shown) is turned on, a control DC 24 volt voltage is applied to power lines 1 and 2 connected to a power source (not shown). The operation stop switch PB1 has a normally closed contact.
When B1 is pressed, this normally closed contact is held open. On the other hand, the operation start switch PB2 has a normally open contact,
A momentary type that turns on only while it is pressed is used.

The B-contact of the first checking relay-CRA is connected in series to the operation stop switch PB1 connected to the power-supply line 1, and one end of the B-contact of this relay-CRA is connected to the power supply line. Shutdown relay connected to 2
The CRY coils are connected in series. The B contact of the relay CRA has a second checking relay CR.
The A contact of B is connected in parallel. The A contact of the second checking relay-CRB has an operation stop switch PB1.
And an operation stop relay CRY are connected in series. In addition, the operation start switch PB2 connected to the power supply line 1
Is connected to the coil of the relay-CRA, and the relay-CRB is connected via the B contact of the relay-CRY.
The coil of is connected. Further, the relay-CRY B contact and the relay-CRB A contact are connected in parallel.

Further, an A contact of the relay CRY, an A contact of the relay CRA and an A contact of the relay CRB are connected in series to the coil of the operating relay CRX whose one end is connected to the power supply line 2. The relay CRX's A contact is
It is connected in parallel to the A-contact series circuit of CRA and CRB.

In the operation control device with a stop operation diagnosis function having the above-described circuit configuration, when a power switch (not shown) is turned on, a voltage of 24 VDC is applied to the power lines 1 and 2. When the operation stop switch PB1 is not pressed, the operation stop relay CRY is turned on (excited) when the power is turned on, as shown in the timing chart of FIG. When the operation start switch PB2 is turned on (turned on) in this state, the first checking relay-CRA
Is excited. At this moment, the B contact of the relay CRA is opened, so the relay CRY is once turned off (non-excited), and the B contact of the relay CRY is closed, so the first check relay CRB is turned on. become. When the relay-CRB is turned on, the relay-CRY is turned on again. Therefore, the A contact of the relay CRY, the A contact of the relay CRA, and the relay C.
Since the A contact of the RB is closed, the coil of the driving relay CRX is excited, and the A of the relay CRX is closed.
Since the contact is closed and the self-holding circuit is formed, the operator's finger is separated from the operation start switch PB2 and turned off (off).
The relay-CRX continues to be on even if
When the relay-CRX is in the ON state, a magnet switch or the like provided in a control target device (not shown) is actuated, and the operation of the device is started. When the operation stop switch PB1 is pressed when the apparatus is stopped after the operation, the operation stop relay CRY is turned off and the A contact of the relay CRY is opened, so that the operation relay CRX is turned off.

In the electric circuit constructed as shown in FIG. 1, when the A contact of the operation stop relay CRY is welded due to a cause such as overcurrent, as shown in FIG. 3, the first check relay CRB is used. Relay C inserted in the circuit to excite the
The RY B contact remains open (broken), and the operating relay
Relay-CR inserted in the circuit for exciting the CRX coil
Since the A contact of Y remains closed, the electric circuit of FIG. 1 is changed to the electric circuit as shown in FIG.

In the circuit of FIG. 3, when a power switch (not shown) is turned on, DC 24 is applied to the power lines 1 and 2.
A voltage of volt is applied. Since the operation stop switch PB1 is not pressed, the operation stop relay CRY is turned on when the power is turned on as shown in the timing chart of FIG. 4, but the A contact of this relay CRY is welded. , The contact C of the relay CRY inserted in the circuit for exciting the first checking relay CRB remains open, and the relay C inserted in the circuit for exciting the operating relay CRX is opened.
The A contact of RY remains closed.

When the operation start switch PB2 is turned on in this state, the first checking relay-CRA is excited. At this moment, the B contact of the relay-CRA opens, so that the relay-CRY is in the non-excited state, but the open / closed state of the contact of the relay-CRY does not change. Therefore, since the second checking relay-CRB is off and the relay-CRX is also off, the operation of the controlled device is not started. As described above, when the A contact of the operation stop relay-CRY is welded due to overcurrent or the like, the operation of the controlled device is not started even if the operation start switch PB2 is turned on, and the safety of the device is improved. Reserved. If the B contact of the relay-CRY for operation stop is welded, the A-contact of the relay CRY inserted in the excitation circuit of the relay CRY will not close, and the operation of the controlled device will not start. As is clear from the description of FIGS. 1 to 4, the circuit of FIG. 1 is provided in the series circuit of the contact for the operation stop relay-CRY and the operation relay-CRX for each operation of turning on the operation start switch. Only when the contact of the relay CRY is once opened and then closed again, the relay for the operation is firstly released.
It is a circuit in which relay circuits for exciting the CRX are connected in series.

Next, a second embodiment of the operation control device with stop operation diagnosis function will be described with reference to the drawings. FIG. 5 is an electric circuit showing the second embodiment. In the electric circuit shown in FIG. 5, the operation stop switch PB1, the operation start switch PB2, and safety plugs SP1 and SP2, which will be described later, and an emergency stop circuit ES are provided on the control target device side, and the operation control device Of the basic unit (this basic unit will be described in the fourth embodiment) for connecting external devices 3 to 40 (each terminal 3 to 40 is circled in the drawing). Connected by the number).

The configuration of this electric circuit will be described below. Operation stop switch PB provided on the controlled device side
To the terminal 39 and the terminal 40 to which 1 is connected,
The A contact of the relay CRY1 and the coil of the operation stop relay CRY whose one end is connected to the power supply line 2 are connected to each other, and the other end of the A contact of the relay CRY1 is connected to the power supply line 1. ing. A charging circuit composed of a resistor R1 and a capacitor C1 is connected in parallel to the coil of the relay CRY1. In addition, the power line 1 and relay
The first check relay C is provided between the CRY1 coils.
A parallel contact circuit of the B contact of RA and the A contact of the second checking relay-CRB is connected.

The terminals 12 and 13 are short-circuited, and the terminal 12 is connected to the power supply line 1. Between the terminals 13 and 14, a safety plug provided on the side of the controlled device is provided. SP1 is connected. The safety plug SP1 is a check switch that is turned on when the operation start condition is satisfied at the start of the operation of the control target device. Further, in a state where the terminals 14 and 10 are short-circuited, an operation start switch PB2 provided on the controlled device side is connected between the terminals 10 and 11. One end of the terminal 11 has a power supply line 2
The coil of the first checking relay-CRA connected to is connected. Further, a parallel contact circuit of the B contact of the relay CRY and the A contact of the second checking relay CRB is connected to the terminal 11, and one end of the power supply line is connected through this parallel contact circuit. Relay CR connected to 2
It is connected to the B coil.

Further, an A contact of the relay CRY, an A contact of the relay CRA, and an A contact of the relay CRB are connected in series to the coil of the operating relay CRX whose one end is connected to the power supply line 2. The relay CRX's A contact is
It is connected in parallel to the A-contact series circuit of CRA and CRB. Between the A contact of the relay-CRY and the power supply line 1, an emergency stop circuit ES provided on the controlled device side,
The terminal 3 to which the safety plug SP2 is connected in series and the emergency stop circuit ES is connected is the power supply line 1
It is connected to the. The emergency stop circuit ES is connected between the terminals 3 and 4, the safety plug SP2 is connected between the terminals 5 and 6, and the terminals 4 and 5 are connected, and the terminals 6 and 7 are connected. , 8 and 9 are short-circuited. The emergency stop circuit ES is in a cutoff state when the control target device is in an abnormal state, and stops the operation of the control target device in an emergency. Further, the safety plug SP2 is a check switch which is turned off when the operation of the controlled device is stopped after the operation is started. When the number of switches to be checked is large, the terminals 7, 8 and 9 are used.

One A contact of the operating relay CRX is connected between the terminals 21 and 22, and the terminal 21 is connected to the coil of the magnet switch MS1 provided on the controlled device side. ing. Therefore, when the driving relay-CRX is excited, A of this relay-CRX is excited.
Since the contact is closed and the magnet switch MS1 is turned on, the operation of the controlled device is started.

Next, the operation of the electric circuit of FIG. 5 will be described with reference to the timing chart shown in FIG. When a power switch (not shown) is turned on, the power line 1,
A voltage of 24 V DC is applied to 2. In this state,
When the charging circuit connected in parallel to the coil of relay CRY1 starts charging and the charging voltage reaches a predetermined value, relay C
RY1 turns on. When the relay CRY1 is turned on, the contact A of the relay CRY1 is closed, so that the relay CRY is turned on and the relay C connected to the excitation circuit of the relay CRX is connected.
The RY A contact closes. At this point, the device to be controlled is normal, the emergency stop circuit ES, the safety plug SP
It is assumed that 1 and SP2 are in a conductive state.

When the operation start switch PB2 provided on the controlled device side is turned on, the relay CRA is turned on, so that the contact B of the relay CRA is opened and the relay C is opened.
When the charging circuit connected to the coil of RY1 is discharged and the voltage applied to the coil drops, the relay-CRY1
Turns off once. As a result, the A contact of relay-CRY1 is opened and relay-CRY is turned off once. Once the relay-CRY is turned off, the relay CRY's B contact is closed so that the relay CRB is turned on and the relay CCR's A contact is closed. Therefore, charging is started again in the charging circuit connected to the coil of relay-CRY1, and when the charging voltage reaches a predetermined value, relay-CRY1 is turned on again. When the relay CRY1 is turned on, the relay CRY1 is closed again by closing the contact A of the relay CRY1, and the contact A of the relay CRY connected to the excitation circuit of the relay CRY is closed.
In this state, the relay CRY's A contact, relay CRA's A contact, and relay connected to the exciter circuit of the relay CRX.
Relay CR because all A contacts of CRB are closed
X is turned on, and the exciting current is supplied to the coil of the relay-CRX via the self-holding A contact of the relay-CRX.
As a result, even if the operation start switch PB2 is turned off and the relay-CRA and relay-CRB are also turned off, the relay-CR is released.
X continues to be on. By providing the above charging circuit, the momentary excitation switching state between relay CRA and relay CRB disappears, and stable contact operation can be secured.

When relay-CRX is turned on, terminal 2
Magnet switch MS1 provided on the side of the control target device with the A contact of the relay CRX connected between the first and second terminals closed.
Is turned on, the operation of the controlled device is started. After the operation of the controlled device is started in this way, when the operation stop switch PB1 is pressed at the end of the operation, the relay CRY is turned off, and the relay CRY A connected to the exciter circuit of the relay CRY is turned on. Because the contact opens, relay-CRX
Is turned off, the magnet switch MS1 is turned off, and the operation of the controlled device is stopped.

After the operation of the controlled device is started, if an abnormal state occurs in the controlled device and the emergency stop circuit ES or the safety plug SP2 is turned off, the operation of the controlled device is stopped.

Next, in the electric circuit of FIG. 5 explained above, a case where the A contact of the operation stop relay CRY is welded will be examined. When the A contact of the relay CRY is welded, the B contact of the relay CRY is opened even in the non-excited state, so that the B contact of the relay CRY connected to the exciter circuit of the relay CRY is It remains open. Therefore, after the operation start switch PB2 is turned on and the relay CRA is turned on, the relay CRY1 is not turned on again, and the relay CRY is not turned on. Therefore, the relay-CRX is not turned on and the operation of the controlled device is not started, so that the welding of the A contact of the operation-stop relay-CRY can be reliably diagnosed.

The operation control device with stop operation diagnosis function according to the second embodiment is capable of arbitrarily connecting a check switch (safety plug SP1) at the time of starting the operation of the controlled device, and the operation of the controlled device. Since the check switch (safety plug SP2) after the start can be arbitrarily connected, the safety at the start of the operation of the controlled device and the safety after the start of the operation can be ensured.

Next, a third embodiment of the operation control device with stop operation diagnosis function will be described with reference to the drawings. FIG. 7 is an electric circuit showing a third embodiment of the operation control device with the stop operation diagnosis function. The configuration of this electric circuit will be described below. In the figure, relay-CRA, CR
B, CRX1, CRX2, CRX3, and CRY1 are provided on the basic unit side of the operation control device with a stop operation diagnosis function, and these relays have a forced opening mechanism at the contact portion, and should they be the same. Even if one contact of the relay is welded, the other contact is a safety relay that is separated by a predetermined distance. Further, relays CRY, CRY2, operation start switch PB2, and safety plugs SP1, SP2, S
P3 is provided on the control target device side, and is a terminal 3 to 40 for connecting an external device provided on the basic unit (each terminal 3 to 40 is indicated by a circled number in the drawing). Connected).

A safety plug SP1 is attached to the coil of the operation stop relay CRY whose one end is connected to the power supply line 2.
And the A contact of the relay-CRY2 are connected in series, and the A contact of the relay-CRY2 is connected to the power supply line 1. In this case, the stop operation by the safety plug SP1 is targeted for diagnosis. A coil of relay CRY2, one end of which is connected to the power supply line 2, is connected to an A contact of relay CRY1 connected to the terminal 39 and terminal 40. A charging circuit composed of a resistor R1 and a capacitor C1 is connected in parallel to the coil of the relay CRY1 whose one end is connected to the power supply line 2. Further, between the power supply line 1 and the relay-CRY1,
A parallel contact circuit of the B contact of the first checking relay-CRA and the A contact of the second checking relay-CRB is connected.

A short circuit is established between the terminals 12 and 13, and a safety plug SP2 provided on the controlled device side is connected between the terminals 13 and 14.
The safety plug SP2 is a check switch that is turned on when the operation start condition is satisfied at the start of the operation of the control target device. Further, in a state where the terminals 14 and 10 are short-circuited, an operation start switch PB2 provided on the controlled device side is connected between the terminals 10 and 11. The coil of the first checking relay-CRA whose one end is connected to the power supply line 2 is connected to the terminal 11. Further, the terminal 11 is connected to the B contact of the relay CRY1, and this B contact is a terminal.
One end is connected to the coil of the second checking relay-CRB connected to the power supply line 2 via the relay CRY B contact connected between the minals 16 and 17. Also,
An A contact of the relay 11 and the relay CRB is connected between the coil of the terminal 11 and the relay CRB. In addition to the B contact of the relay-CRY, the auxiliary B contact of the magnet switch of the control target device may be connected to the CC portion surrounded by the broken line. Further, between the power supply line 1 and the terminal 12, the B contacts of the operating relays CRX1 to CRX3, the A contact of the relay CRY1, and the B contact of the relay CRB are connected in series. In addition, the power line 1 and
Two A contacts of the relay-CRA are connected in series between the minal 10.

The operating relays CRX1 to CRX3 are
One end of the coil is connected to the power supply line 2, and the A contact of the relay CRY1, the A contact of the relay CRA, and the A contact of the relay CRB are connected in series to the other end of the coil of the relay. It is connected. Further, in the series contact circuit of the A contact of the relay CRA and the A contact of the relay CRB, the relay CRX1
~ A contact series circuit of each CRX3 is connected in parallel. Further, the power line 1 and the terminal 3 are connected, and the operation stop switch PB1 is provided between the terminals 3 and 4.
Is connected, and a safety plug S is connected between the terminals 4 and 5.
P3 is connected. Then, in a state where the terminals 5 and 6 are short-circuited, the relay CR is provided between the terminals 6 and 9.
The A contact of Y is connected, and the terminal 9 is the relay described above.
It is connected to the A contact of CRY1.

The three A contacts of the operating relay CRX1 have terminals 21, 22 and terminals 27, 28 and terminals.
It is connected to the terminals 33 and 34, and each A contact can be connected to the control target device. Also,
Three relay A-contacts for driving relay CRX2 are terminal 2
3,24, terminal 29,30, terminal 35,3
6, and each A contact can be connected to the control target device. In addition, driving relay C
The three A contacts of RX3 are connected to the terminals 25 and 26, the terminals 31 and 32, and the terminals 37 and 38, respectively, so that the respective A contacts can be connected to the controlled device. . As described above, the driving relays-CRX1 to C
With each A contact of RX3 connected to the controlled device,
The relay-CRX1 to CRX3 are turned on, and each A
When the contact is closed, the magnet switch of the controlled device is turned on, and the operation is started. Further, when the operation stop switch PB1 is pressed to stop the operation of the controlled device, the relays CRX1 to CRX3 are turned off and the respective A contacts are opened, so that the operation of the controlled device is stopped. It

Incidentally, the A contact of the relay CRY1 connected to the terminals 39 and 40 is a safety relay contact which is separated by a predetermined distance even if one contact of the relay is welded, so that safety is ensured. Secured. In addition, relay-CRA, CR
The same safety relay is used for B, CRX1, CRX2, and CRX3, so that an erroneous circuit operation can be prevented.

Next, the operation of the electric circuit of FIG. 7 will be described with reference to the timing chart shown in FIG. When a power switch (not shown) is turned on, the power line 1,
A voltage of 24 V DC is applied to 2. In this state,
When the charging circuit connected to the coil of relay-CRY1 starts charging and the charging voltage reaches a predetermined value, relay-CRY1
Turns on. When the relay CRY1 is turned on, the A contact of the relay CRY1 connected to the terminals 39 and 40 is closed, so that the relay CRY2 is turned on. As a result, the relay
Since the A contact of CRY2 is closed, the safety plug SP1
Is ON, the relay-CRY is turned on, and the A contact of relay-CRY connected between terminals in the exciting circuits of relays CRX1 to 3 is closed.

The relay-CRY1 is turned on and is connected between the power supply line 1 and the terminal 12.
Is closed, and the safety plug SP2 connected between the terminals 13 and 14 is in a conductive state, the operation start switch PB provided on the control target device side.
When 2 is turned on, the relay-CRA turns on. As a result, the two A contacts of the relay CRA connected between the power supply line 1 and the terminal 10 are both closed, and the B contact of the relay CRA is opened to connect the coil of the relay CRY1 to the charging circuit. Then, when the voltage applied to the coil is reduced, the relay CRY1 is turned off once.
As a result, the A contact of relay-CRY1 opens and relay-CR
Once Y2 is turned off and relay-CRY2 is turned off, relay-CRY is also turned off once. Once the relay-CRY is turned off, the relay B-contact of the relay-CRY is in the closed state, so the operation start condition on the controlled device side is satisfied, the relay-CRB is turned on, and the contact A of the relay-CRB is closed. .

When the contact A of the relay-CRB is closed, the charging circuit connected to the coil of the relay-CRY1 is charged again, and when the charging voltage reaches a predetermined value, the relay-CRY is released.
1 turns on again. When the relay CRY1 is turned on, the A contact of the relay CRY1 is closed, so that the relay CRY2 is turned on again and the A contact of the relay CRY2 is closed. As a result, the relay-CRY is turned on again, and the A contact of the relay-CRY connected between the terminals is closed. In this state, the relays connected to the exciter circuits of relays CRX1 to 3 are connected.
CRY1 A contact, relay CRA A contact, and relay
Relay CR because all A contacts of CRB are closed
X1 to X3 are turned on, and the exciting current is supplied to the coil of the relay-CRX through the self-holding A contacts of the relays-CRX1 to 3. As a result, even if the operation start switch PB2 is turned off and the relay-CRA and relay-CRB are turned off, the relays-CRX1 to CRX1 to 3 continue to be in the on state. In this way, the magnet switch or the like on the controlled device side is turned on and the operation is started. And relay-CR
X1 to X3 are until the operation stop switch PB1 is pressed,
Alternatively, until the safety plug SP1 or the safety plug SP3 is cut off due to an abnormality occurring during the operation of the control target device, the ON state is maintained and the operation of the control target device is continued.

Next, in the electric circuit of FIG. 7 described above, a case where the A contact of the operation stop relay CRY is welded will be examined. When the A contact of the relay CRY is welded, the B contact of the relay CRY is opened even in the non-excited state, so that the B contact of the relay CRY connected to the exciter circuit of the relay CRY is It remains open. Therefore, after the operation start switch PB2 is turned on and the relay-CRA is turned on, the relay-CRY1 is not turned on again and the relay-CRY is not turned on. Therefore, the relay-CRX does not turn on and the operation of the controlled device is not started, so that welding of the A contact of the operation-stop relay-CRY can be easily diagnosed. When the B contact of the operation stop relay-CRY is welded,
Since the A contacts of the relays CRY connected to the excitation circuits of the drive relays CRX1 to 3 do not close, the drive relay CR
X1 to 3 do not turn on.

Next, a fourth embodiment of the operation control device with stop operation diagnosis function will be described with reference to the drawings. FIG. 9 and FIG. 10 are electric circuits showing a fourth embodiment of the operation control device with stop operation diagnosis function. 9 and 10 show an electric circuit of the operation control device with a stop operation diagnosis function, but if all are drawn within a predetermined area of one A4 plate, each part becomes extremely small, so it is unavoidable. 9, 10
Are shown separately. FIG. 11 shows a state in which the extension unit U1 is added to the basic unit U of the operation control device with the stop operation diagnosis function.
While one of the connectors CN1 connected to both ends of the extension unit U1 is inserted into the connector insertion opening CN-1 of the basic unit U, the other end of the connector CN1 is attached to the connector insertion opening C of the extension unit U1.
FIG. 11 is a perspective view showing that the basic unit U and the extension unit U1 are connected to each other by being attached to N-1, so that it is possible to cope with the addition of a control target device or an increase in operation check conditions. When the number of the extension units U1 is one, the end connector CNE is inserted into the connector insertion opening CN-2 provided on the upper surface so that the circuit is configured in a closed loop as described later. There is.

Further, in FIG. 12, two extension units U1 and U2 are added to the basic unit U, and the extension unit U
2 shows a state in which the end connector CNE is inserted into the second connector insertion port CN-2. It should be noted that connectors CN2 and CN1 are connected to the ends of the extension cable UC2, and the connector insertion ports C of the extension units U1 and U2, respectively.
It is inserted into N-2 and CN-1. 9 and 10, the electric circuit diagram using the three expansion units U1, U2, and U3 is used. Therefore, another expansion unit U3 is added to the expansion unit U2 in FIG. It is configured. Therefore, the end connector CNE is inserted into the connector insertion opening CN-2 of the extension unit U3.

The structure of the electric circuit shown in FIGS. 9 and 10 will be described below. In the figure, relay-CRA, CRB, C
RX1, CRX2, CRX3, CRY1 are provided in the basic unit U, and these relays are safety relays.
Is used. The relays CRY, CRY2, the operation stop switch PB1, the operation start switch PB2, and the safety plugs SP1, SP2, SP3 are provided on the side of the control target device. Furthermore, the above-mentioned extension unit U1,
The circuits 2 and 3 are shown surrounded by broken lines.

The safety plug SP1 is attached to the coil of the operation stop relay CRY whose one end is connected to the power supply line 2.
And the A contact of the relay-CRY2 are connected in series, and the A contact of the relay-CRY2 is connected to the power supply line 1. A relay whose one end is connected to the power line 2
The CRY2 coil has terminal 39 and terminal 4
The A contact of relay-CRY1 connected to 0 is connected. In addition, this relay whose one end is connected to the power line 2
A charging circuit composed of a resistor R1 and a capacitor C1 is connected in parallel to the coil of CRY1. The B contact of the first checking relay-CRA is connected between the power supply line 1 and the coil of the relay-CRY1. Furthermore this B
In parallel with the contacts, the A contact of the second check relay CRB on the basic unit U side and the A contacts of the respective second check relay CRBs provided in the extension units U1, 2, 3 are connected in series. The connected series contact circuit is connected.

As mentioned above, a plurality of extension cables UC are provided.
Both end connectors CN1, 2 of 1, 2, 3 (however, the extension cable UC3 is not shown) are inserted into the corresponding connector insertion opening, and the connector insertion opening CN-2 of the extension unit U3 is inserted.
Since the end connector CNE is inserted in the connector, the three A contacts of the respective second check relays-CRB provided in the extension units U1, 2, 3 are connected to the connector CN.
1, CN2, extension cables UC1, UC2, UC3, and end connector CNE are connected in series. Incidentally, CN1
-11, CN2-11 and the like symbols are connectors CN1, CN
2 shows the 11th pin number, and CNE-11 and 12 show the 11th and 12th pin numbers of the end connector CNE. This pin number is one example in the present embodiment. It is shown and it is decided in the design stage in the actual device.

The coil of the first checking relay-CRA, one end of which is connected to the power supply line 2, has the terminal 10,
The operation start switch PB2 connected between 11 is connected. Further, between the terminal 10 and the power supply line 1, two A contacts of the relay CRA are connected in series. Between the power supply line 1 and the terminal 12, the B contacts of the operating relays CRX1 to CRX3 and the relay CR are connected.
Y relay for A1 and B contact for relay-CRB, and two relays for operation-CRX provided in expansion units U1, 2, and 3
B contacts of 1 and 2, B contacts of second check relays CRB provided in the extension units U1, 2, 3, end connector CNE, and extension cables UC1 to UC3.
And are connected in series. And the terminal 12,
In a state in which 13 is short-circuited, a safety plug SP2 provided on the control target device side is provided between the terminals 13 and 14.
Is connected. The safety plug SP2 is a check switch that is turned on when the operation start condition is satisfied at the start of the operation of the control target device.

The terminal 11 has the relay CR.
The B contact of Y1 is connected, and this B contact is the terminal 16
A second one end of which is connected to the power supply line 2 through
Is connected to the coil of the check relay-CRB.
Also, there is a relay C between the terminal 11 and the terminal 20.
The A contact of RB is connected. In addition, CC surrounded by a broken line
The B contact of the relay-CRY is connected between the terminals of the section. In addition to the B contact of the relay-CRY, although not shown, an auxiliary B contact of the magnet switch of the control target device may be connected. The above is the description of the configuration of the electric circuit shown in FIG.

Next, the electric circuit of FIG. 10 will be described continuously. As described above, the connectors CN1 and CN2 at both ends of each of the plurality of extension cables UC1, UC2 and CU3 are inserted into the corresponding connector insertion opening, and the connector insertion opening CN- of the extension unit U3.
Since the end connector CNE is attached to the second unit 2, one end of the coil of each second check relay-CRB provided in the extension unit U1, 2, 3 has a connector C.
It is connected to the power supply line 2 via the pin 1 of N1. Also, one end of each A contact of the relay-CRB is relay-C.
It is connected to the coil of RB and the other end is 14 of each connector CN1.
It is connected to the 14th pin of CN1 in FIG. 9 through the 14th pin. In addition, one end of the operation start condition circuit CCU1, 2, 3 corresponding to the broken line CC portion in FIG. 9 is connected to CN1 of FIG.
It is connected to pin 3.

Further, there are provided operation relays CRX1 to CRX3 each having one end of the coil connected to the power supply line 2. The driving relays CRX1 to CRX3 are provided in the basic unit U, and the relays CRX1 to CRX3 are provided.
The circuit for exciting the is configured as follows. That is, the power supply line 1 and the terminal 3 are connected, the operation stop switch PB1 is connected between the terminals 3 and 4, and the safety plug SP3 is connected between the terminals 4 and 5. . Then, in a state where the terminals 5 and 6 are short-circuited, an A contact of the relay CRY is connected between the terminals 6 and 9.

Both end connectors CN1 and CN2 of the extension cables UC1, UC2 and ED3 are inserted into the connector insertion openings, and the end connector CNE is inserted into the connector insertion opening CN-2 of the expansion unit U3. Therefore, the operation monitoring circuit unit U of the extension units U1 to U3 having the same function as the operation monitoring circuit connected to the terminals 3 to 9 is provided.
S1, S2, S3 are connected in series, and the A contact of the relay-CRY1 is connected in series to the terminal. The A contact of the relay-CRY1 includes the A contact of the relay CRA,
The relay-CRB A contact is connected in series. Further, the A contact of the relay-CRY1 has a relay-CRX1
~ A-contact series circuit of each CRX3 is inserted.

Relay A of the relay-CRA and relay-CRB
The A-contact series circuit is connected in series with the A-contacts of relays CRB provided in the extension units U1 to U3, and relays CRX1 to CRX1 through the end connector CNE of the extension unit U3 and the extension cable. It is connected to the CRX3 coil.

Further, in the A-contact series circuits of the relays CRX1 to CRX3, the two relays CRX1 and CRX2 for operation provided in the expansion units U1 to U3 are connected.
The contact series circuits are connected in series via the extension cables UC1 to UC3, and further connected via the end connector CNE inserted in the extension unit U3, the extension cables UC1 to 3 and the connectors CN1 and CN2. -Connected to the CRX1 to CRX3 coils.

As described above, the operation control device with the stop operation diagnosis function according to the fourth embodiment is constructed so that the extension units U1 to U3 can be added to the basic unit U. When there are many circuit conditions for starting the operation of the controlled device, the operation start condition circuit can be arbitrarily inserted in the operation start circuit. Further, even when the number of abnormality check circuits after the start of operation becomes large, the abnormality check circuits can be arbitrarily inserted into the exciting circuit of the operating relay.

Incidentally, FIGS. 9 and 10 configured as described above.
The basic operation of the electric circuit of is similar to that of the electric circuit shown in FIG. 7 described above. To explain it in brief, the relay-CRA is turned on by pressing the operation start switch PB2 after the power is turned on. Then, when the two A contacts of the relay-CRA are both closed and the B contact of the relay-CRA is opened to be discharged from the charging circuit connected to the coil of the relay-CRY1, the voltage applied to the coil decreases. , Relay
CRY1 turns off once. As a result, the contact A of the relay-CRY1 is opened, the relay-CRY2 is turned off once, and once the relay-CRY2 is turned off, the relay-CRY is turned off once.

Once the relay CRY is turned off, the relay C
Since the B contact of RY is closed, the relay CRB is turned on if the operation start condition on the controlled device side is satisfied, the A contact of this relay CRB is closed, and the relay C is closed.
Charging is started again in the charging circuit connected to the coil of RY1, and when the charging voltage reaches a predetermined value, relay CRY1 is turned on again. When relay-CRY1 turns on, relay-CR
Since the A contact of Y1 is closed, the relay CRY2 is turned on again and the A contact of the same relay is closed. As a result, relay-C
RY is turned on again, and the relay A-contact of the CRY is closed. In this state, all the A contacts of the relays connected to the excitation circuits of the relays CRX1 to 3 are closed, so that the relays CRX1 to 3 are turned on, and the relays CRX1 to A for self-holding. Since the exciting current is supplied to the coil of the relay CRX via the contact, the magnet switch or the like on the controlled device side is turned on and the operation is started. Then, the relays-CRX1 to 3 are kept in the ON state until the operation stop switch PB1 is pressed or an abnormality occurs during the operation of the controlled device, and the operation of the controlled device is continued.

Next, if the A contact of the operation stop relay CRY is welded in the above electric circuit, this relay C
Since the B contact of RY is opened, the B contact of relay CRY connected to the CC portion of the exciter circuit of relay CRB remains open. Therefore, the operation start switch PB
Of course, after the relay 2 is turned on and the relay CRA is turned on, the relay CRY1 is not turned on again.
CRY does not turn on again. Therefore, the relay-CRX1
Since ~ CRX3 is not turned on and the operation of the controlled device is not started, it is possible to easily diagnose the welding of the A contact of the operation stop relay-CRY. When the B contact of the operation relay-CRY is welded, the A contact of the relay-CRY does not close, so the operation relay-CRX is not closed.
It is clear from the electric circuit that 1 to CRX3 do not turn on.

[Brief description of drawings]

FIG. 1 is an electric circuit diagram showing a first embodiment of the present invention.

FIG. 2 is a timing chart of the electric circuit of FIG.

FIG. 3 is an electric circuit diagram showing a state in which contacts of an operation stop relay in the electric circuit of FIG. 1 are welded.

FIG. 4 is a timing chart of the electric circuit of FIG.

FIG. 5 is an electric circuit diagram showing a second embodiment of the present invention.

FIG. 6 is a timing chart of the electric circuit of FIG.

FIG. 7 is an electric circuit diagram showing a third embodiment of the present invention.

8 is a timing chart of the electric circuit of FIG.

FIG. 9 is an electric circuit diagram showing a fourth embodiment of the present invention.

FIG. 10 is an electric circuit diagram showing a fourth embodiment of the present invention together with FIG.

FIG. 11 is a perspective view showing a state in which an extension unit is added to the basic unit of the operation control device with a stop operation diagnosis function.

FIG. 12 is a perspective view showing a state in which two extension units are added to the basic unit of the operation control device with a stop operation diagnosis function.

FIG. 13 is an electric circuit diagram of a conventional operation control device.

FIG. 14 is a timing chart of the electric circuit of FIG.

FIG. 15 is a relay for stopping operation in the electric circuit of FIG.
FIG. 6 is an electric circuit diagram when the contacts of FIG.

16 is a timing chart of the electric circuit of FIG.

[Explanation of symbols]

 CRY Operation stop relay-CRX Operation release-CRA First check relay-CRB Second check relay-PB1 Operation stop switch PB2 Operation start switch U Basic unit U1 to U3 Expansion unit

Claims (5)

[Claims] 1. When a contact of the operation stop relay-CRY and a contact of the operation stop relay-CRX are once opened and then closed again in the series circuit of the operation stop relay-CRX each time the operation start switch is turned on. The operation control device with stop operation diagnosis function, which is connected to the relay circuit for exciting the operation relay CRX for the first time. 2. A first check relay-CRA is connected in series to an operation start switch, and a B contact of the first check relay-CRA is connected in series to an operation stop relay-CRY and the operation is performed. B relay contact for operation stop relay-CRY and second check relay-CRB in series with start switch
And the A contact of the second check relay-CRB are connected in series to the operation stop relay CRY, and the operation stop relay CRY is connected to the A contact of the operation stop relay CRY. The operation control device with a stop operation diagnosis function according to claim 1, wherein the A contact of the first checking relay-CRA and the A contact of the second checking relay-CRB are connected in series. 3. The stop operation diagnosis according to claim 1 or 2, wherein the stop operation diagnosis is configured as a unit and can be installed in an arbitrary device, and a check switch or the like for performing a diagnosis check at the start of operation or during operation can be connected. Operation control device with functions. 4. A safety relay having a mechanism for forcibly dissociating contacts is used as the operating relay CRX, and the relay CRX is used.
The operation control device with a stop operation diagnosis function according to claim 1, 2 or 3, wherein the B contact is connected to an operation start switch in series. 5. The operation control device with stop operation diagnosis function according to claim 2, 3 or 4, wherein the number of circuits for exciting the second checking relay CRB can be increased by an extension unit.