JP4558575B2 - Operation circuit of electromagnetic switchgear - Google Patents

Description

  The present invention relates to an operation circuit of an electromagnetic switchgear such as an electromagnetic contactor applied to an electric device and its control panel, switchboard and the like.

FIG. 7 is a circuit diagram showing an example of a normally-excited operation circuit of a conventional electromagnetic contactor. However, the one-dot chain line frame in the figure is an internal circuit inside the main body of the electromagnetic contactor, and the other is an external circuit configured outside the electromagnetic contactor. The same applies to the other drawings.
Always-excited operation circuit is a circuit for holding the electrically charged state, the commercial AC power supply terminals R, during T, then the starting pushbutton switch 5a1 normally open contacts form which is normally open switch state, A normally closed contact type stop push button switch 5b1 that is normally closed and a closing auxiliary relay MCX1 are connected in series, and the closing auxiliary relay MCX1 is normally opened in parallel with the starting push button switch 5a1. The normally open contact MCX1a1 of the auxiliary relay MCX1 is connected between the control power terminals P and N to which the contact MCX1a3 is connected and the DC power converted from the AC power by the rectifier SI1 in the electromagnetic contactor is supplied. and a MCX1a2, a closing coil MCC1, four of the auxiliary switch MCb1 normally closed limit during operation contact type but are connected in series, also in parallel with the turned coil MCC1 Lifting coil MCH is configured by connecting.

In such a configuration, when the electromagnetic contactor is turned on, the closing auxiliary relay MCX1 is operated under the condition that the start pushbutton switch 5a1 is pressed, and the normally open contact MCX1a3 is closed and self-held by this operation.
At the same time, the normally open contacts MCX1a1 and MCX1a2 are closed by the operation of the closing auxiliary relay MCX1, and the closing coil MCC1 and the holding coil MCH are excited to operate. Thus, after the electromagnetic contactor is started, the auxiliary switch MCb1 operates in an open state, and thereby the closing coil MCC1 becomes inoperative.
Further, when the electromagnetic contactor is stopped, charged auxiliary relay MCX1 on condition suction pressure of the stop pushbutton switch 5b1 becomes inoperative, whereby since the normally open contact MCX1a1 and MCX1a2 operate open, holding coil during operation MCH is deactivated and the magnetic contactor stops.

FIG. 8 is a circuit diagram showing an example of a mechanical latch type operation circuit of a conventional electromagnetic contactor. The mechanical latch type operation circuit is a circuit that mechanically keeps the on state, and between the commercial AC power supply terminals R and T, a normally open contact type start push button switch 5a2 and a normally closed time limit type auxiliary switch. MCb2 and auxiliary auxiliary relay MCX2 are connected in series, and normally open contact MCX2a3 of auxiliary auxiliary relay MCX2 is connected in parallel to start-up pushbutton switch 5a2. Further, AC power is supplied by rectifier SI2 in the magnetic contactor. Between the control power supply terminals P and N to which the DC power converted from is supplied, the normally open contacts MCX2a1 and MCX2a2 of the auxiliary relay MCX2 and the input coil MCC2 are connected in series. closed contact type stop push button switch 5b2, the auxiliary switch MCa1 normally open contacts shaped, three and tripping coil MCT has been formed by connecting in series.

In such a configuration, when the electromagnetic contactor is turned on, the closing auxiliary relay MCX2 is operated on condition that the start pushbutton switch 5a2 is pressed, and the normally open contact MCX2a3 is closed and self-held by this operation.
At the same time, the normally open contacts MCX2a1 and MCX2a2 are closed by the operation of the closing auxiliary relay MCX2, whereby the closing coil MCC2 is excited to operate.

When the electromagnetic contactor is stopped, a control power is supplied to the tripping coil MCT via the auxiliary switch MCa1 and the tripping operation is performed on the condition that the pushbutton switch 5b2 for stopping is pressed. Stop.
As an operation circuit of this type of conventional electromagnetic contactor, for example, there are those described in Patent Documents 1, 2, 3, and 4.
Japanese Patent Laid-Open No. 6-119861 JP-A-8-2222088 JP-A-10-275549 Japanese Patent Laid-Open No. 11-4532

However, in the operation circuit of the conventional magnetic contactor, which is a conventional switch, the normally-excited type keeps the on state electrically, while the mechanical latch type keeps the on state mechanically. The configuration of the internal circuit of the magnetic contactor differs depending on the application of the method. For this reason, even in the external circuit of the magnetic contactor, the operation method differs between the constant excitation type and the mechanical latch type.
For this reason, when developing and manufacturing an electromagnetic contactor, it is necessary to develop and manufacture two types of structures, an always excited type and a mechanical latch type, for both internal and external circuits. There is a problem that the cost becomes high.
The present invention has been made in view of such problems, and an object of the present invention is to provide an operation circuit for an electromagnetic switching device that can reduce the development and manufacturing costs of the electromagnetic switching device.

  In order to achieve the above object, an operation circuit for an electromagnetic switching device according to claim 1 of the present invention has a switch that mechanically holds a closed state in an internal circuit, and the switch is connected to a closing coil of the internal circuit. In the operation circuit of the electromagnetic switching device that controls the switching on and off by the trip coil of the internal circuit, the switch is inserted between the terminals to which the control voltage from the uninterruptible DC power supply is supplied. Connect the on / off relay circuit that is in the energized state when the switch to be in the on state is turned on and is released when the switch in the off state is turned off. The excitation coil is energized in response to the excitation state of the circuit, and after this switch is turned on by this excitation, the first auxiliary switch circuit is used to release the excitation of the closing coil. The closing coil is connected, and the tripping coil is energized between the terminals when the closing / cutting relay circuit is de-energized. After the switch is shut off by this excitation, the trip coil The tripping coil is connected through a second auxiliary switch circuit for releasing excitation.

  According to this configuration, the structure of the electromagnetic switchgear main body is a mechanical latch type, and the operation method is an always-excited electromagnetic switchgear that keeps an electrically turned on state. It becomes possible to correspond to the driving method. Therefore, the development and production costs of the electromagnetic switchgear are greatly increased compared to the case where both the internal circuit and the external circuit of the electromagnetic switchgear have to be developed and manufactured in the conventional excitation type and the mechanical latch type. Can be lowered.

According to a second aspect of the present invention, there is provided an operation circuit for an electromagnetic switching device according to the first aspect, further comprising a relay that is energized when the switch is turned on and receives the energized state of the relay. A third auxiliary switch circuit that releases the excitation of the coil and releases the relay's excitation state in response to the breaking state of the switch, and is connected between the terminals in combination with the first auxiliary switch circuit. Features.
According to this configuration, the operation circuit of claim 1 is further provided with the third auxiliary switch circuit for releasing the excitation of the closing coil, so that the excitation is released twice. Excitation can be reliably released.

According to a third aspect of the present invention, there is provided an operation circuit for an electromagnetic switching device according to the second aspect, further comprising a relay that is energized when the switch is turned on and receives the energized state of the relay. A fourth auxiliary switch circuit for releasing the excitation of the coil, receiving the breaking state of the switch and releasing the excitation state of the relay is provided in an external circuit of the switch, and the fourth auxiliary switch circuit provided is provided. A switch circuit is connected between the terminals in combination with the first and third auxiliary switch circuits.
According to this configuration, since the operation circuit of claim 2 is further provided with the fourth auxiliary switch circuit for releasing the excitation of the closing coil in the external circuit, the excitation is released in triplicate. The excitation of the input coil can be released more reliably.

  According to a fourth aspect of the present invention, there is provided an operation circuit for an electromagnetic switching device having a switch that mechanically holds an on state in an internal circuit, wherein the switch is brought into an on state by a closing coil of the internal circuit. In the operation circuit of an electromagnetic switch that controls the switching on / off by the circuit tripping coil, the switch is energized when the switch that switches on the switch is turned on between the AC terminals to which AC voltage is supplied. A DC circuit that is connected to a relay circuit for closing and closing that is released from an excited state when the switch that turns off the switch is turned off and that is converted by a rectifier connected between the AC terminals is supplied. Excitation of the closing coil is energized between the terminals in response to the excitation state of the relay circuit for closing and closing, and after the switch is turned on by this excitation, the excitation of the closing coil is released. And connecting the input coil via a first auxiliary switch circuit, connecting a capacitor storing the DC voltage converted by the rectifier between the rectifier and the DC terminal, and connecting between the DC terminals. A second auxiliary switch circuit for energizing the tripping coil when releasing the on / off relay circuit and releasing the excitation of the tripping coil after the switch is shut off by this excitation. The tripping coil is connected via a wire.

  According to this configuration, when the control power source is an AC power source, the switch can be shut off by the voltage stored in the capacitor even if the AC power source is shut off due to a power failure or the like. In other words, in the case of the prior art, when a power failure occurs when the switch is in the on state, the switch remains in its on state, and when the power failure is restored, the electrical device connected to the magnetic contactor via the switch is used as it is. There is a problem that power is supplied and the device operates unnecessarily, causing danger or damage. However, in the present invention, since the switch can be shut off as described above even during a power failure, the above-mentioned problems can be solved.

According to a fifth aspect of the present invention, there is provided an operation circuit for an electromagnetic switching device according to the fourth aspect, further comprising: a relay that is in an excited state in response to an on state of the switch. A third auxiliary switch circuit that releases the excitation of the coil and releases the relay's excitation state in response to the breaking state of the switch, and is connected between the terminals in combination with the first auxiliary switch circuit. Features.
According to this configuration, when the control power source is an AC power source, even if the AC power source is shut off due to a power failure or the like, the switch can be shut off by the voltage stored in the capacitor, and the energizing coil can be excited. It can be reliably released by the double releasing operation.

According to a sixth aspect of the present invention, an operation circuit for an electromagnetic switching device according to the fifth aspect of the present invention further comprises a relay that is energized when the switch is turned on and receives the energized state of the relay. A fourth auxiliary switch circuit for releasing the excitation of the coil, receiving the breaking state of the switch and releasing the excitation state of the relay is provided in an external circuit of the switch, and the fourth auxiliary switch circuit provided is provided. A switch circuit is connected between the terminals in combination with the first and third auxiliary switch circuits.
According to this configuration, when the control power source is an AC power source, even if the AC power source is shut off due to a power failure or the like, the switch can be shut off by the voltage stored in the capacitor, and the energizing coil can be excited. It can be reliably released by the triple releasing operation.

As described above, according to the present invention, there is an effect that it is possible to reduce the development and manufacturing cost of the electromagnetic switchgear.
In addition, since the excitation of the closing coil is released twice, even when the excitation release of the closing coil is not performed by one release operation, for example, the excitation release can be performed by the other release operation. There is an effect that the excitation of the closing coil can be reliably released.
In addition to this, since the excitation of the closing coil is canceled by an external circuit, the excitation is released in triplicate, so even if the excitation of the closing coil is not released by two release operations in the internal circuit, There is an effect that the excitation can be reliably released by an external circuit.

  In addition, when the control power source is an AC power source, there is an effect that the switch can be interrupted by the voltage stored in the capacitor even if the AC power source is interrupted due to a power failure or the like. Thus, in the case of the prior art, when a power failure occurs when the switch is in the on state, the switch remains in the on state, and the electrical device connected to the magnetic contactor directly through the switch when the power failure is restored There is a problem that the power is supplied to the device and the device operates unnecessarily, causing danger or damage. However, in the present invention, since the switch can be shut off as described above even during a power failure, there is an effect that the above problem can be solved.

Hereinafter, embodiments of the present invention will be described with reference to the drawings. However, parts corresponding to each other in all the drawings in this specification are denoted by the same reference numerals, and description of the overlapping parts will be omitted as appropriate.
(First embodiment)
FIG. 1 is a diagram showing a configuration of an operation circuit of an electromagnetic contactor according to a first embodiment of the present invention. However, the one-dot chain line frame in the figure is an internal circuit inside the main body of the magnetic contactor, and the other is an external circuit. The same applies to the other drawings.

  The operation circuit of the electromagnetic contactor according to the first embodiment is characterized in that the internal circuit of the electromagnetic contactor is composed of one kind of mechanical latch type, and the external circuit is a normally open contact type and a normally closed contact of a closing relay. Utilizing the shape, it has a normally excited configuration that operates a closing coil that closes the switch in the internal circuit (closed state) and a trip coil that opens the switch (closed state). It is in. However, the switch is turned on or off from the on state or the on state by the electromagnetic force of the electromagnet, and the on / off control is performed by the operation circuit.

As shown in FIG. 1, the operation circuit of this magnetic contactor includes a normally open contact start push button switch 5a and a normally closed contact between control power terminals P and N of an uninterruptible DC power supply (not shown). A stop push-button switch 5b and an on / off auxiliary relay 52Z that operates by applying a control voltage are connected in series, and an auxiliary a contact 52Za1 of the on / off auxiliary relay 52Z is connected in parallel to the start push button switch 5a, Further, the auxiliary a contact 52Za2, the switch auxiliary b contact LS, the switch auxiliary b contact 52b1, the switch input coil 52C, and the switch auxiliary b contact 52b2 of the input / output auxiliary relay 52Z are connected in series. In addition, the auxiliary b contact 52Zb1, the switch auxiliary a contact 52a1 of the closing interruption auxiliary relay 52Z, and the trip coil 52H of the switch are connected in series.

The start pushbutton switch 5a, the normally closed contact stop pushbutton switch 5b, the closing interrupt auxiliary relay 52Z, and the auxiliary a contact 52Za1 constitute a closing interrupt circuit.
The auxiliary a contact 52Za2, the switch auxiliary b contact LS, the switch auxiliary b contact 52b1, the switch input coil 52C, and the switch auxiliary b contact 52b2 constitute a first auxiliary switch circuit. .
Further, the auxiliary b contact 52Zb1, the switch auxiliary a contact 52a1, and the tripping coil 52H constitute a second auxiliary switch circuit.

The operation of the operation circuit of the magnetic contactor according to the first embodiment having such a configuration will be described.
First, when the electromagnetic contactor is turned on, after the control voltage is supplied to the control power terminals P and N, when the start pushbutton switch 5a of the external circuit is pressed, the closing interrupting auxiliary relay 52Z is excited, and this operation assists. The a contact 52Za1 is closed and self-holds.
At the same time, the auxiliary a contact 52Za2 is also closed and self-holds, so that a control voltage is applied to the closing coil 52C via the switch auxiliary b contact LS and the switch auxiliary b contacts 52b1 and 52b2, and thereby the closing coil 52C. Is excited, and the switch is turned on by this excitation operation. That is, the input state is mechanically held in the internal circuit.

Immediately after the switch is turned on in this way, the switch auxiliary b contacts 52b1 and 52b2 are opened and the excitation of the making coil 52C is released. Even if this release is made, the open state of the switch remains maintained.
Further, since the on / off auxiliary relay 52Z is in an excited state, the auxiliary b contact 52Zb1 is in an open state, and since the switch is in an on state, the switch auxiliary a contact 52a1 is in a closed state.

Next, when the electromagnetic contactor is cut off, when the stop push button switch 5b is pulled, the self-holding auxiliary auxiliary relay 52Z is released, and the auxiliary b contact 52Zb1 is closed by this release. As a result, a control voltage is applied to the tripping coil 52H via the switch auxiliary a contact 52a1, so that the tripping coil 52H is excited, and the switch in the on state is cut off by this excitation operation.
This breaker state opens the switch auxiliary a contact 52a1, and the excitation of the trip coil 52H is released.

  As described above, the operation circuit of the electromagnetic contactor according to the first embodiment is configured such that the internal circuit of the electromagnetic contactor is composed of one type of mechanical latch type, and the external circuit is a normally open contact type of the auxiliary relay 52Z for interrupting. Using a normally closed contact type, a normally-excited configuration is employed in which a closing coil 52C for turning on the switch in the internal circuit and a tripping coil 52H for turning off the switch are operated.

  As a result, the configuration of the main body of the magnetic contactor is a mechanical latch type, and the operation method is a normally excited electromagnetic contactor. Therefore, one type of electromagnetic contactor can support two types of operation methods. Therefore, the development and production costs for the magnetic contactor internal circuit and external circuit are greatly increased compared to the need to develop and produce two types of configurations, the constant excitation type and the mechanical latch type. Can be lowered.

(Second Embodiment)
FIG. 2 is a diagram showing the configuration of the operation circuit of the magnetic contactor according to the second embodiment of the present invention.
The operation circuit of the electromagnetic contactor shown in FIG. 2 is different from the operation circuit shown in FIG. 1 in that a circuit for exciting the making coil 52C and releasing this excitation is connected to a circuit for releasing the exciting coil 52C. Therefore, the excitation is canceled twice.

For this purpose, as shown in FIG. 2, a switch auxiliary a contact 52a2 and a closing coil tripping relay 52Y connected in series to the operation circuit of FIG. 1 are connected between the auxiliary a contact 52Za2 and the switch auxiliary b contact LS. And an auxiliary b contact 52Yb1 of the closing coil tripping relay 52Y between the switch auxiliary b contact LS and the switch auxiliary b contact 52b1. A circuit was constructed.
The switch auxiliary a contact 52a2, the closing coil tripping relay 52Y, and the auxiliary b contact 52Yb1 constitute a third auxiliary switch circuit. Further, in order to improve safety when the switch auxiliary a contact 52a2 breaks down, the auxiliary a contact 52Ya1 is connected in parallel to the switch auxiliary a contact 52a2.

The operation of the operation circuit of the magnetic contactor according to the second embodiment having such a configuration will be described.
First, when the electromagnetic contactor is turned on, after the control voltage is supplied to the control power terminals P and N, when the start pushbutton switch 5a is pressed, the closing interrupting auxiliary relay 52Z is excited, and this operation causes the auxiliary a contact 52Za1. Is closed and self-holds.
At the same time, since the auxiliary a contact 52Za2 is also closed and self-held, a control voltage is applied to the closing coil 52C via the switch auxiliary b contact LS, the auxiliary b contact 52Yb1, and the switch auxiliary b contacts 52b1 and 52b2. As a result, the closing coil 52C is excited, and the switch is turned on by this excitation operation.

  Immediately after the switch is turned on in this way, the switch auxiliary b-contacts 52b1 and 52b2 are opened, and the switch auxiliary a-contact 52a2 is closed, and this closed state causes a closing coil tripping relay 52Y. A control voltage is applied to the relay 52Y to excite the relay 52Y. This excitation opens the auxiliary b contact 52Yb1. That is, immediately after the switch is turned on, the switch auxiliary b contacts 52b1 and 52b2 and the auxiliary b contact 52Yb1 are opened, so that the excitation of the making coil 52C is released. Even if this release is made, the open state of the switch remains maintained.

In addition, since the on / off auxiliary relay 52Z is in an excited state, the auxiliary b contact 52Zb1 is in an open state, and since the switch is in an on state, the switch auxiliary a contacts 52a1 and 52a2 are in a closed state. .
Next, when the electromagnetic contactor is cut off, when the stop push button switch 5b is pulled, the self-holding auxiliary auxiliary relay 52Z is released, and the auxiliary b contact 52Zb1 is closed by this release. As a result, a control voltage is applied to the tripping coil 52H via the switch auxiliary a contact 52a1, so that the tripping coil 52H is excited, and the switch in the on state is cut off by this excitation operation.
This breaker state opens the switch auxiliary a contacts 52a1 and 52a2, and the excitation of the tripping coil 52H and the closing coil tripping relay 52Y is released.

  As described above, the operation circuit for the magnetic contactor according to the second embodiment is provided with a circuit for canceling the excitation of the closing coil 52C in the operation circuit according to the first embodiment, so that the excitation is doubled. There is a thing to cancel. As a result, even if the switch auxiliary b contacts 52b1 and 52b2 are not opened due to a malfunction or the like, for example, the auxiliary b contact 52Yb1 is opened, so that the excitation of the closing coil 52C can be reliably released. . In other words, the reliability of the operation for releasing the excitation of the closing coil 52C can be improved. In addition, the same effect as in the first embodiment can be obtained.

(Third embodiment)
FIG. 3 is a diagram showing the configuration of the operation circuit of the electromagnetic contactor according to the third embodiment of the present invention.
The operation circuit of the magnetic contactor shown in FIG. 3 is different from the operation circuit shown in FIG. 2 in that a circuit for releasing the excitation of the closing coil 52C is provided in an external circuit so that the excitation is released in triplicate. It is in that.
That is, in an external circuit, a switch auxiliary a contact 52a3 and a closing coil tripping relay 52X are connected in series between the control power terminals P and N, and an auxiliary a contact 52Za2, a switch auxiliary a contact 52a2 and an open / close switch The auxiliary b contact 52Xb1 of the closing coil tripping relay 52X is connected between the connection point of the device auxiliary b contact LS and the operation circuit is configured.
The switch auxiliary a contact 52a3 and the closing coil tripping relay 52X constitute a fourth auxiliary switch circuit.

The operation of the operation circuit of the magnetic contactor according to the third embodiment having such a configuration will be described.
First, when the electromagnetic contactor is turned on, after the control voltage is supplied to the control power terminals P and N, when the start pushbutton switch 5a is pressed, the closing interrupting auxiliary relay 52Z is excited, and this operation causes the auxiliary a contact 52Za1. Is closed and self-holds.
At the same time, since the auxiliary a contact 52Za2 is also closed and self-holds, the control voltage is applied via the auxiliary b contact 52Xb1, the switch auxiliary b contact LS, the auxiliary b contact 52Yb1, and the switch auxiliary b contacts 52b1 and 52b2. This is applied to 52C, thereby energizing the making coil 52C, and the switch is turned on by this exciting operation.

Immediately after the switch is turned on in this way, the switch auxiliary b-contacts 52b1 and 52b2 are opened, and the switch auxiliary a-contact 52a2 is closed, and this closed state causes a closing coil tripping relay 52Y. A control voltage is applied to the relay 52Y to excite the relay 52Y. This excitation opens the auxiliary b contact 52Yb1.
At the same time, the switch auxiliary a contact 52a3 is closed, and by this closed state, a control voltage is applied to the closing coil tripping relay 52X and the relay 52X is excited. This excitation opens the auxiliary b contact 52Xb1.

That is, immediately after the switch is turned on, the switch auxiliary b contacts 52b1 and 52b2, the auxiliary b contact 52Yb1, and the auxiliary b contact 52Xb1 are opened, so that the excitation of the making coil 52C is released. Even if this release is made, the open state of the switch remains maintained.
Further, since the on / off auxiliary relay 52Z is in an excited state, the auxiliary b contact 52Zb1 is in an open state, and since the switch is in an on state, the switch auxiliary a contacts 52a1, 52a2, 52a3 are in a closed state. ing.

Next, when the electromagnetic contactor is cut off, when the stop push button switch 5b is pulled, the self-holding auxiliary auxiliary relay 52Z is released, and the auxiliary b contact 52Zb1 is closed by this release. As a result, a control voltage is applied to the tripping coil 52H via the switch auxiliary a contact 52a1, so that the tripping coil 52H is excited, and the switch in the on state is cut off by this excitation operation.
This breaker state opens the switch auxiliary a contacts 52a1, 52a2, 52a3, and the excitation of the tripping coil 52H and the closing coil tripping relays 52Y and 52X is released.

  As described above, the operation circuit of the magnetic contactor according to the third embodiment is obtained by providing a circuit for releasing the excitation of the closing coil 52C in the external circuit in addition to the operation circuit according to the second embodiment. Is to be released in triplicate. Thus, for example, even if the circuit for releasing the excitation of the closing coil 52C in the internal circuit is not opened due to a malfunction or the like, the auxiliary b contact 52Xb1 in the external circuit is opened, so that the excitation of the closing coil 52C is performed. Can be reliably released. In other words, the reliability of the operation for releasing the excitation of the closing coil 52C can be further improved. In addition, the same effect as in the first embodiment can be obtained.

(Fourth embodiment)
FIG. 4 is a diagram showing the configuration of the operation circuit of the electromagnetic contactor according to the fourth embodiment of the present invention.
The operation circuit of the magnetic contactor shown in FIG. 4 is characterized in that when the control power of the electromagnetic contactor is a commercial AC power supply in the operation circuit shown in FIG. The electromagnetic contactor is cut off using C1.

That is, the operation circuit of this electromagnetic contactor operates by applying a commercial voltage between the commercial AC power supply terminals R and T, a normally open contact start push button switch 5a, a normally closed contact stop push button switch 5b. The auxiliary cutoff relay 52Z is connected in series, and the auxiliary a contact 52Za1 of the auxiliary cutoff 52Z1 is connected in parallel to the start pushbutton switch 5a. Further, between the control power supply terminals P and N to which the DC power converted from the AC power by the rectifier D1 is supplied, the auxiliary a contact 52Za2 of the on / off auxiliary relay 52Z, the switch auxiliary b contact LS, and the switching A switch auxiliary b contact 52b1, a switch input coil 52C, and a switch auxiliary b contact 52b2 are connected in series. Further, a rectifier D2 is connected between the commercial AC power supply terminals R and T, and a capacitor C1 that stores a DC voltage converted by the rectifier D2 in a capacitor through a resistor is provided, and the DC stored in the capacitor C1 is provided. Between the control power supply terminals P and N to which power is supplied, the auxiliary b contact 52Zb1, the switch auxiliary a contact 52a1 of the on / off auxiliary relay 52Z, and the trip coil 52H of the switch are connected in series. It is configured.

The operation of the operation circuit of the magnetic contactor according to the fourth embodiment having such a configuration will be described.
First, when the magnetic contactor is turned on, when the AC voltage is supplied to the commercial AC power supply terminals R and T, when the start button push switch 5a of the external circuit is pressed, the closing interrupting auxiliary relay 52Z is excited, By this operation, the auxiliary a contact 52Za1 is closed and self-held.
At the same time, since the auxiliary a contact 52Za2 to which the DC voltage converted by the rectifier D1 is applied is also closed and self-held, the control voltage is supplied via the switch auxiliary b contact LS and the switch auxiliary b contacts 52b1 and 52b2. Is applied to the closing coil 52C, thereby exciting the closing coil 52C, and the switch is turned on by this excitation operation. That is, the input state is mechanically held in the internal circuit.

Immediately after the switch is turned on in this way, the switch auxiliary b contacts 52b1 and 52b2 are opened and the excitation of the making coil 52C is released. Even if this release is made, the open state of the switch remains maintained.
On the other hand, since the AC voltage is supplied to the commercial AC power terminals R and T, the capacitor C1 stores a predetermined amount of charge, and the stored DC power is supplied to the control power terminals P and N. Yes. The auxiliary b contact 52Zb1 connected between the control power terminals P and N is in an open state because the on / off auxiliary relay 52Z is in an excited state, and the switch is in an on state. Therefore, the switch auxiliary a contact 52a1 is closed.

  Next, when the electromagnetic contactor is cut off, when the stop push button switch 5b is pulled, the self-holding auxiliary auxiliary relay 52Z is released, and the auxiliary b contact 52Zb1 is closed by this release. As a result, the control voltage between the control power terminals P and N is applied to the tripping coil 52H via the switch auxiliary a contact 52a1, so that the tripping coil 52H is excited, and this excitation operation causes the switch to be turned on. Is cut off. This switch-off state opens the switch auxiliary a contact 52a1, and the excitation of the trip coil 52H is released.

On the other hand, when the switch is in the on state, it is assumed that the commercial AC power supplied between the commercial AC power terminals R and T fails for some reason. Even in the case of this power failure, the voltage stored in the capacitor C1 is in a supply state between the control power terminals P and N.
Accordingly, the power-off auxiliary relay 52Z that is connected between the commercial AC power terminals R and T and has been self-held until then is de-energized due to a power failure, so that the auxiliary b contact 52Zb1 is closed by this release. Become. As a result, the control voltage between the control power terminals P and N is applied to the tripping coil 52H via the switch auxiliary a contact 52a1, so that the tripping coil 52H is excited, and this excitation operation causes the switch to be turned on. Is cut off. This breaker state opens the switch auxiliary a contact 52a1, and the excitation of the trip coil 52H is released.

As described above, the operation circuit of the magnetic contactor according to the fourth embodiment is stored in the capacitor C1 even when the AC power source is cut off due to a power failure or the like when the control power source of the magnetic contactor is a commercial AC power source. The switch of the magnetic contactor was cut off by the voltage.
Here, in the case of the prior art, when a power failure occurs when the switch is in the on state, the switch remains in the on state, and the electrical device connected to the magnetic contactor directly through the switch when the power failure is restored There is a problem that the power is supplied to the device and the device operates unnecessarily, causing danger or damage.
However, in the operation circuit of this electromagnetic contactor, since the switch can be shut off as described above even in the event of a power failure, the above problems can be solved. In addition, the same effect as in the first embodiment can be obtained.

(Fifth embodiment)
FIG. 5 is a diagram showing the configuration of the operation circuit of the electromagnetic contactor according to the fifth embodiment of the present invention.
The operation circuit of the magnetic contactor shown in FIG. 5 is characterized in that in the operation circuit shown in FIG. 4, a circuit for exciting the closing coil 52C and releasing the excitation is further connected to a circuit for releasing the excitation of the closing coil 52C. Therefore, the excitation is canceled twice.
In order to release this double, as shown in FIG. 5, the switch auxiliary a contact 52a2 and the closing coil tripping relay 52Y connected in series with each other are connected between the auxiliary a contact 52Za2 and the switch auxiliary b contact LS, The control circuit is connected to the control power supply terminal N, and the auxiliary b contact 52Yb1 of the closing coil tripping relay 52Y is connected between the switch auxiliary b contact LS and the switch auxiliary b contact 52b1, and the operation circuit is connected. Configured.

The operation of the operation circuit of the magnetic contactor according to the fifth embodiment having such a configuration will be described.
First, when the electromagnetic contactor is turned on, when the start pushbutton switch 5a is pressed while the AC voltage is supplied to the commercial AC power terminals R and T, the closing interrupting auxiliary relay 52Z is excited, The auxiliary a contact 52Za1 is closed and self-holds.
At the same time, since the auxiliary a contact 52Za2 to which the DC voltage converted by the rectifier D1 is applied is also closed and self-held, the switch auxiliary b contact LS, the auxiliary b contact 52Yb1, and the switch auxiliary b contact 52b1, 52b2 Then, a control voltage is applied to the closing coil 52C via this, whereby the closing coil 52C is excited, and the switch is turned on by this excitation operation.

Immediately after the switch is turned on in this way, the switch auxiliary b-contacts 52b1 and 52b2 are opened, and the switch auxiliary a-contact 52a2 is closed, and this closed state causes a closing coil tripping relay 52Y. A control voltage is applied to the relay 52Y to excite the relay 52Y. This excitation opens the auxiliary b contact 52Yb1. That is, immediately after the switch is turned on, the switch auxiliary b contacts 52b1 and 52b2 and the auxiliary b contact 52Yb1 are opened, so that the excitation of the making coil 52C is released. Even if this release is made, the open state of the switch remains maintained.
In addition, since the on / off auxiliary relay 52Z is in an excited state, the auxiliary b contact 52Zb1 is in an open state, and since the switch is in an on state, the switch auxiliary a contacts 52a1 and 52a2 are in a closed state. .

  Next, when the electromagnetic contactor is cut off, when the stop push button switch 5b is pulled, the self-holding auxiliary auxiliary relay 52Z is released, and the auxiliary b contact 52Zb1 is closed by this release. As a result, a control voltage is applied to the tripping coil 52H via the switch auxiliary a contact 52a1, so that the tripping coil 52H is excited, and the switch in the on state is cut off by this excitation operation. This breaker state opens the switch auxiliary a contacts 52a1 and 52a2, and the excitation of the tripping coil 52H and the closing coil tripping relay 52Y is released.

On the other hand, when the switch is turned on, the voltage stored in the capacitor C1 is supplied between the control power terminals P and N even when the commercial AC power supply fails.
Accordingly, since the energization cancellation auxiliary relay 52Z that has been held by itself due to a power failure is released, the auxiliary a contact 52Za2 is opened by this cancellation, and the circuit system of the input coil 52C is controlled by the control power terminal. Separated from P and N.

  At the same time, when the auxiliary b contact 52Zb1 is closed, the control voltage between the control power terminals P and N is applied to the trip coil 52H via the switch auxiliary a contact 52a1, so that the trip coil 52H is excited. In this excitation operation, the on / off switch is turned off. This breaker state opens the switch auxiliary a contact 52a1, and the excitation of the trip coil 52H is released.

  As described above, the operation circuit of the magnetic contactor according to the fifth embodiment is provided with a circuit for canceling the excitation of the closing coil 52C in the operation circuit according to the fourth embodiment, so that the excitation is doubled. There is a thing to cancel. As a result, the same effect as in the fourth embodiment can be obtained. Further, even when the auxiliary switch b contacts 52b1 and 52b2 are not opened due to malfunctions, for example, the auxiliary b contact 52Yb1 is Since the open state is established, the excitation of the closing coil 52C can be reliably released. In other words, the reliability of the operation for releasing the excitation of the closing coil 52C can be improved.

(Sixth embodiment)
FIG. 6 is a diagram showing the configuration of the operation circuit of the electromagnetic contactor according to the sixth embodiment of the present invention.
The operation circuit of the electromagnetic contactor shown in FIG. 6 is characterized in that in the operation circuit shown in FIG. 5, a circuit for releasing the excitation of the closing coil 52C is further provided in an external circuit so that the excitation is released in triplicate. It is in that.
In order to release the triplicate, as shown in FIG. 6, in the external circuit, a switch auxiliary a contact 52a3 and a closing coil tripping relay 52X are connected in series between the control power supply terminals P and N. The operation circuit is configured by connecting the auxiliary b contact 52Xb1 of the closing coil tripping relay 52X between the auxiliary a contact 52Za2 and the connection point of the switch auxiliary a contact 52a2 and the switch auxiliary b contact LS.

The operation of the operation circuit of the magnetic contactor according to the sixth embodiment having such a configuration will be described.
First, when the electromagnetic contactor is turned on, when the start pushbutton switch 5a is pressed while the AC voltage is being supplied to the commercial AC power supply terminals R and T, the closing interrupting auxiliary relay 52Z is excited, and the auxiliary contact a 52Za1 is closed and self-holds.
At the same time, since the auxiliary a contact 52Za2 to which the DC voltage converted by the rectifier D1 is applied is also closed and self-held, the auxiliary b contact 52Xb1, the switch auxiliary b contact LS, the auxiliary b contact 52Yb1, and the switch auxiliary A control voltage is applied to the making coil 52C through the b contacts 52b1 and 52b2, thereby exciting the making coil 52C, and the switch is turned on by this exciting operation.

Immediately after the switch is turned on in this way, the switch auxiliary b-contacts 52b1 and 52b2 are opened, and the switch auxiliary a-contact 52a2 is closed, and this closed state causes a closing coil tripping relay 52Y. A control voltage is applied to the relay 52Y to excite the relay 52Y. This excitation opens the auxiliary b contact 52Yb1.
At the same time, the switch auxiliary a contact 52a3 is closed, and by this closed state, a control voltage is applied to the closing coil tripping relay 52X and the relay 52X is excited. This excitation opens the auxiliary b contact 52Xb1.

That is, immediately after the switch is turned on, the switch auxiliary b contacts 52b1 and 52b2, the auxiliary b contact 52Yb1, and the auxiliary b contact 52Xb1 are opened, so that the excitation of the making coil 52C is released. Even if this release is made, the open state of the switch remains maintained.
Further, since the on / off auxiliary relay 52Z is in an excited state, the auxiliary b contact 52Zb1 is in an open state, and since the switch is in an on state, the switch auxiliary a contacts 52a1, 52a2, 52a3 are in a closed state. ing.

  Next, when the electromagnetic contactor is cut off, when the stop push button switch 5b is pulled, the self-holding auxiliary auxiliary relay 52Z is released, and the auxiliary b contact 52Zb1 is closed by this release. As a result, a control voltage is applied to the tripping coil 52H via the switch auxiliary a contact 52a1, so that the tripping coil 52H is excited, and the switch in the on state is cut off by this excitation operation. This breaker state opens the switch auxiliary a contacts 52a1, 52a2, 52a3, and the excitation of the tripping coil 52H and the closing coil tripping relays 52Y and 52X is released.

On the other hand, when the switch is turned on, the voltage stored in the capacitor C1 is supplied between the control power terminals P and N even when the commercial AC power supply fails.
Accordingly, since the energization cancellation auxiliary relay 52Z that has been held by itself due to a power failure is released, the auxiliary a contact 52Za2 is opened by this cancellation, and the circuit system of the input coil 52C is controlled by the control power terminal. Separated from P and N.

  At the same time, when the auxiliary b contact 52Zb1 is closed, the control voltage between the control power terminals P and N is applied to the trip coil 52H via the switch auxiliary a contact 52a1, so that the trip coil 52H is excited. In this excitation operation, the on / off switch is turned off. This breaker state opens the switch auxiliary a contact 52a1, and the excitation of the trip coil 52H is released.

  As described above, the operation circuit of the magnetic contactor according to the sixth embodiment is obtained by providing a circuit for releasing the excitation of the closing coil 52C in the external circuit in addition to the operation circuit according to the fifth embodiment. Is to cancel the triple. As a result, the same effects as those of the fifth embodiment can be obtained. Further, for example, even when the circuit for releasing the excitation of the closing coil 52C in the internal circuit is not opened due to a malfunction or the like, Since the auxiliary b contact 52Xb1 in the external circuit is opened, the excitation of the closing coil 52C can be reliably released. In other words, the reliability of the operation for releasing the excitation of the closing coil 52C can be further improved.

It is a circuit diagram which shows the structure of the operation circuit of the electromagnetic contactor which concerns on the 1st Embodiment of this invention. It is a circuit diagram which shows the structure of the operation circuit of the magnetic contactor which concerns on the 2nd Embodiment of this invention. It is a circuit diagram which shows the structure of the operation circuit of the electromagnetic contactor which concerns on the 3rd Embodiment of this invention. It is a circuit diagram which shows the structure of the operation circuit of the electromagnetic contactor which concerns on the 4th Embodiment of this invention. It is a circuit diagram which shows the structure of the operation circuit of the electromagnetic contactor which concerns on the 5th Embodiment of this invention. It is a circuit diagram which shows the structure of the operation circuit of the electromagnetic contactor which concerns on the 6th Embodiment of this invention. It is a circuit diagram which shows an example of the continuous excitation type operation circuit of the conventional electromagnetic contactor. It is a circuit diagram which shows an example of the mechanical latch type operation circuit of the conventional electromagnetic contactor.

Explanation of symbols

5a Normally open contact start pushbutton switch 5b Normally closed contact stop pushbutton switch 52Z On / off auxiliary relay 52Za1, 52Za2 On / off auxiliary relay auxiliary a contact 52Zb1, 52Zb2 On / off auxiliary relay auxiliary b contact LS Open / close Switch auxiliary b contact 52b1, 52b2 Switch auxiliary b contact 52C Switch closing coil 52H Switch trip coil 52a1, 52a2, 52a3 Switch auxiliary a contact 52Y Switch coil tripping relay 52Ya1 Switch coil tripping relay auxiliary a contact 52Yb1 closing coil tripping relay auxiliary b contact 52X closing coil tripping relay 52Xb1 closing coil tripping relay auxiliary b contact D1, D2 rectifier C1 capacitor P, N control power supply terminal R, T commercial AC power supply terminal

Claims (6)

An electromagnetic switch that has a switch that mechanically holds the on state in the internal circuit, and that performs the on / off control by setting the switch to the on state by the internal circuit's input coil and the internal circuit's trip coil. In the operation circuit of the device,
Between the terminals to which the control voltage from the uninterruptible DC power supply is supplied, the switch is energized when the switch is turned on to turn on the switch, and the excitation state is released when the switch is turned off to turn off the switch. Connect the input / output relay circuit.
A first coil that releases an excitation of the closing coil after the switching coil is turned on by the excitation by receiving the excitation state of the closing-shut-off relay circuit between the terminals. Connect the closing coil via an auxiliary switch circuit;
A second coil for releasing the excitation of the tripping coil after exciting the trip coil between the same terminals when the energization release relay circuit is de-energized. An operation circuit for an electromagnetic switching device, wherein the tripping coil is connected via an auxiliary switch circuit. A relay that is in an excited state in response to the switching state of the switch is released, the excitation of the coil is released in response to the excitation state of the relay, and the excitation state of the relay is determined in response to a cutoff state of the switch The operation circuit of the electromagnetic switching device according to claim 1, wherein a third auxiliary switch circuit to be released is connected between the terminals in combination with the first auxiliary switch circuit. A relay that is in an excited state in response to the switching state of the switch is released, the excitation of the coil is released in response to the excitation state of the relay, and the excitation state of the relay is determined in response to a cutoff state of the switch A fourth auxiliary switch circuit to be released is arranged in an external circuit of the switch, and the arranged fourth auxiliary switch circuit is connected between the terminals in combination with the first and third auxiliary switch circuits. The operation circuit of the electromagnetic switching device according to claim 2. An electromagnetic switch that has a switch that mechanically holds the on state in the internal circuit, and that performs the on / off control by setting the switch to the on state by the internal circuit's input coil and the internal circuit's trip coil. In the operation circuit of the device,
Between the AC terminals to which AC voltage is supplied, the switch enters the excited state when the switch that turns on the switch is turned on, and the excitation state is released when the switch that turns off the switch turns off. Connect the relay circuit,
Between the DC terminals to which the DC voltage converted by the rectifier connected between the AC terminals is supplied, the energizing coil is energized in response to the excitation state of the closing / interrupting relay circuit, and the opening / closing is performed by this excitation. After the device is in the closing state, the closing coil is connected via a first auxiliary switch circuit that releases the excitation of the closing coil,
Between the rectifier and the DC terminal, a capacitor that stores the DC voltage converted by the rectifier is connected,
A second coil that excites the tripping coil between the DC terminals when the release-cutting relay circuit is de-energized and releases the switch after the switch is shut off by this excitation. An operation circuit for an electromagnetic switching device, wherein the tripping coil is connected via an auxiliary switch circuit. A relay that is in an excited state in response to the switching state of the switch is released, the excitation of the coil is released in response to the excitation state of the relay, and the excitation state of the relay is determined in response to a cutoff state of the switch The operation circuit of the electromagnetic switching device according to claim 4, wherein a third auxiliary switch circuit to be released is connected between the terminals in combination with the first auxiliary switch circuit. A relay that is in an excited state in response to the switching state of the switch is released, the excitation of the coil is released in response to the excitation state of the relay, and the excitation state of the relay is determined in response to a cutoff state of the switch A fourth auxiliary switch circuit to be released is arranged in an external circuit of the switch, and the arranged fourth auxiliary switch circuit is connected between the terminals in combination with the first and third auxiliary switch circuits. The operation circuit for an electromagnetic switch according to claim 5.

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