JPH0451407Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to an operation circuit that can arbitrarily turn on and off the same device from two or more locations.

A conventional example of this type of operating circuit is shown in FIG. The illustrated example shows a case where there are two operation points, each of which has a non-locking "off" push button switch BS ₁ ,
BS ₃ , _the non-lock type "on" push button switch BS ₂ at one location and the coil of the auxiliary relay The non-lock type "on" push-in switch BS ₄ and the a contact X ₁ of the auxiliary relay X are connected in parallel, and the series circuit is connected between the control power lines l ₁ and l ₂ . In addition,
The output is controlled by opening and closing the a contact _X2 of the relay X.

In such an operation circuit, when _the "ON" push button switch BS ₂ or BS ₄ is operated to close, _{the relay} Even after this, the energization of relay X is maintained.

Further, when the "off" push button switch BS ₁ or BS ₃ is operated while the relay X is in the energized state, the relay X is deenergized, the contact X ₁ is also opened, and the self-holding state is released.

In this way, "enter" at either of the two locations,
Although the "off" operation is performed, installation space for two push button switches is required at each location.

The present invention takes the above points into consideration and aims to provide an operation circuit that requires only one push button switch at each operation location.

The operating circuit according to the present invention is characterized by using a push button switch with an alternate momentary mechanism, which has a contact point for alternate operation and a contact point for momentary operation, and will be described in detail below based on the illustrated embodiment. .

FIG. 2 shows an embodiment of the present invention, in which there are two operating points. In Figure 2,
PB-A has alternate operation contacts A ₁ and A ₂ and momentary operation contact A ₃ .
A push button switch with a momentary mechanism, PB-B, is a push button switch with an alternate momentary mechanism that operates in the same way as this switch PB-A, and has contacts B ₁ and B ₂ for alternate operation and contact B ₃ for momentary operation. X is an auxiliary relay,
It has a contacts X ₁ and X ₂ for self-holding and output.
A contact _X1 of this relay X and the push button switch PB
-A, PB-B momentary operation contacts A ₃ , B ₃
are connected in parallel, and a relay coil is connected in series to one end of this parallel circuit. In addition, at the other end of the parallel circuit (upper end in the figure) there is a push button switch PB-A,
A series circuit of contacts A ₁ and B ₂ for alternate operation of PB-B and a series circuit of contacts A ₂ and B ₁ are connected, respectively, and these are connected between control power lines l ₁ and l ₂ .

Next, the operation will be explained with reference to the time chart shown in FIG. By operating switch PB-A at time t ₁ , its contacts A ₁ , A ₂ , and A ₃ change to the positions shown in Fig. 3b.
It operates as shown in c and d, and the power line l ₁ ~ switch
Contact A ₁ of PB-A ~ Contact B ₂ of switch PB-B ~
Switch PB-A contact A ₃ ~ Relay X coil ~
A relay coil excitation circuit of power supply line _l2 is formed to energize relay _X , and a self-hold circuit is formed by closing its contact Relay X remains energized even after _A3 is opened.

If a power outage occurs in this state, relay X is deenergized, its contacts X ₁ and X ₂ are opened, and the self-hold circuit is opened. Therefore, even when power is restored, relay X remains deenergized and the contact
X ₁ and X ₂ are open circuits, so no output is sent to the outside and it is safe. After this, at time t ₂ , the switch PB-
When A is operated again, each of the contacts _A1 to _A3 operates as shown in FIG. 3b, c, and d. In this case, contact A ₃
Even if it turns on instantaneously, contact _A1 turns off and relay X remains deenergized.

On the other hand, by operating switch PB-B at time _t3 , its contacts _B1 , _B2 , and _B3 operate as shown in FIG. 3e, f, and g, and the coil of relay X is energized. Due to this excitation, relay X becomes energized, contact _X1 closes, and a self-hold circuit is formed.

The operation for power failure and restoration in this state is the same as described above, and is safe because relay X remains deenergized. After this, when switch PB-B is operated again at time t ₄ , contacts B ₁ to _{B 3} are
It operates as shown in Figures e, f, and g, with relay X in the de-energized state.

Note that when relay X is energized, relay X is deenergized by operating switch PB-A or PB-B.

FIG. 4 shows another embodiment of the present invention, in which there are three operation points. In this case, switches PB-A and PB-B are the same as in the previous embodiment, but switch PB-C has alternate operation contacts C ₁ , C ₂ , C ₄ and C ₅ and momentary operation contact C ₃ . A push button switch with an alternate momentary mechanism is used. This switch PB
-C contact C ₃ is connected in parallel to the parallel circuit of momentary operation contacts A ₃ and B ₃ of other switches PB-A and PB-B, and contact C ₂ is connected in parallel to the parallel circuit of contacts A ₁ and B ₂ of the other switches PB-A and PB-B. A contact C ₅ is inserted at the intermediate point of the series circuit of contacts A ₂ and B ₁ , respectively. And both contacts
Contacts C ₁ and C ₄ are connected to cross each other between both ends of C ₂ and C ₅ .

A circuit having such a configuration operates as shown in FIG. The operations at t ₁ , t ₂ , t ₃ , and t ₄ are the same as those at t ₁ , t ₂ , t ₃ , and t ₄ in Figure 3, and at t ₅
By operating switch PB-C, contacts _C1 to _C5 operate as shown in h, i, j, k, and l in FIG. 5, thereby energizing relay X. Activation of this relay X closes its contact _X1 , forming a self-hold circuit. The operation of switch PB-C at time t ₆ operates as shown in Fig. 5 h, i, j, k, l,
Relay X is deenergized by turning off contact _C4 .

In this case as well, push button switches PB-A and PB- with an alternate momentary mechanism are used as shown in Fig. 2.
Relay X is energized or deenergized as desired by each operation of B and PB-C, and when the power is restored, the relay is kept in the deenergized state to ensure safety.

FIG. 6 shows a case where the operating circuit according to the present invention is applied to a single solenoid on/off circuit.
There are two operating points, and the circuit configuration of the excitation circuit for the auxiliary relay X is the same as that shown in FIG. 2 except that an interlock switch S is inserted.
The primary winding of the transformer TF is connected between the control power lines l ₁ and l ₂ , and the indicator lights L ₁ and L ₂ are connected to the secondary side via the contacts X ₄ and X ₅ of the relay X. so-called display circuit
DP is configured. Also, the contact of relay
X ₂ and X ₃ are connected in series with the solenoid coil SC and between the solenoid power lines l ₃ and l ₄ .

In this circuit, when push button switch PB-A or PB-B is operated, relay X is energized, contacts X ₁ to X ₄ are closed, and contact X ₅ is opened. As a result, the self-holding of the relay X, the lighting display of the indicator lamp _L1 , and the opening or closing operation of the solenoid valve based on the excitation of the solenoid coil SC are performed.

After this, when switch PB-A or PB-B is operated again, relay X is deenergized, contacts X ₁ to X ₄ are opened, and contact X ₃ is closed. This will cause the indicator light to
_L2 lights up, the relay self-hold is released, and the solenoid valve closes or opens by de-energizing the solenoid coil SC.

According to the present invention, a first contact and a momentary contact of alternate operation that are closed when the "ON" operation is operated and a second contact of the alternate operation that is closed when the "OFF" operation is operated are interlocked with each other. The relay coil is excited through the first contact of one push button switch and the second contact of the other push button switch.
The "on" and "off" operations of the same device can be arbitrarily performed at multiple locations with priority given to subsequent operations, and moreover, only one push button switch is required for each operating location, and the installation space is reduced to one.

The momentary operation contact of each pushbutton switch is connected in parallel to the relay's A contact to form the relay's self-holding circuit, and the coil is not energized unless the momentary operation contact is closed, allowing power outage recovery. The relay can be reliably de-energized at times, preventing the equipment from operating unexpectedly, which is also beneficial in terms of safety.

[Brief explanation of the drawing]

Figure 1 is a circuit diagram showing a conventional example of an operating circuit;
The figure is a circuit diagram showing one embodiment of the operating circuit according to the present invention, Figures 3a to 3g are time charts for explaining the operation of the same embodiment, and Figure 4 is a circuit diagram showing another embodiment of the present invention. 5A to 5L are time charts for explaining the operation of another embodiment, and FIG. 6 is a circuit diagram showing an example of application of the operating circuit according to the present invention. PB-A, PB-B and PB-C...Push button switch with alternate momentary mechanism, A ₁ , A ₂ ,
B ₁ , B ₂ , C ₁ , C ₂ , C ₄ , C ₅ ... Contacts for alternate operation, A ₃ , B ₃ , C ₃ ... Contacts for momentary operation, X ... Auxiliary relay, X ₁ to X ₅ ...Relay contact.

Claims (1)

[Scope of Claim for Utility Model Registration] In an operation circuit that arbitrarily turns on and off the same device at multiple locations, the first contact of the alternate operation and the momentary operation that are interlocked with each other and are closed when the "ON" operation is performed. A plurality of push-button switches each having a contact and a second contact of alternate operation that is closed when the "off" operation is performed are used, and the first and second contacts of one push-button switch are arranged in different current paths. At the same time, a series circuit is formed by the first contact of one push button switch and the second contact of the other push button switch, and the coil and a contact of the relay are connected in series, and the momentary operation contact of each push button switch is connected in series. An operating circuit characterized in that the self-holding circuit of the relay is configured by connecting the a-contact in parallel, and the self-holding circuit and the series circuit of the first and second contacts are connected in series.