JPS592042B2 - Relay sequence circuit - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention provides a relay sequence circuit for starting a plurality of devices or devices in a predetermined order and stopping them in the reverse order of starting. This is related to the improvement of.

This type of circuit generally consists of a step circuit section consisting of a plurality of unit relay circuits that operate one after another in a predetermined order, and its oscillation circuit section. FIG. 3 is a circuit diagram of a sequence circuit.

An overview of a conventional relay sequence circuit will be explained with reference to FIG. R1 to R8, RX, and RY are relay coils, SR1 to SR7, SRX, and SRY are resistors, C1 to C7, CX, and CY are coil capacitors, and D1 to D8, DX, and DY are This is a diode to prevent inrush current, and S is a start switch. The oscillation circuit section consists of relay coils RX and RY and their auxiliary circuits, and the stepping circuit section consists of relay coils R1 to R3 and their auxiliary circuits. To explain the stepwise circuit section in more detail, the first stage is a unit relay circuit consisting of the relay coil R1, the resistor SR1, the capacitor C1, the diode D1, and the contact R2A2. The second to eighth stages are composed of unit relay circuits. In the above circuit configuration, when the start switch S is turned on, the current flows through the relay RX.
and flows into capacitor CX, relay RX is energized and capacitor CX is charged.

Contact RXA then closes, energizing relay RY and charging capacitor CY. Contact RYB is opened by the energization of the relay RY, and the electric path between the relay RX and the capacitor CX is cut off, but the relay RX continues to be energized for a while due to the current of discharge from the capacitor CX. Therefore, contact RXA also remains closed. Relay after a while
RX is no longer energized and its contact RXA is restored and opened, cutting off the electrical circuit to relay RY and capacitor CY. However, the relay RY will remain energized for a while due to the discharge current of the capacitor CY, so the contact RY
B also remains open. In this way capacitor CX
and CY alternately repeat charging and discharging, so that the above-mentioned relay RX. 15RY repeats the delayed recovery operation. At the same time as the oscillation operation starts in the oscillation circuit section, the relay R
A switching contact RXC, which is a contact of X, starts a switching operation in the stepwise circuit section. By switching contact RXC, relay R1 operates via diode D1, and capacitor C
1 is charged. Due to the operation of relay R1, its contact Rl
Al closes to prepare the energizing circuit for the next relay R2. When contact RXC switches, relay R2 operates and capacitor C2 is charged. Relay R1 is disconnected from the current by switching contact RXC, but it continues to operate for a while due to the discharge current of capacitor C1, so contact R1
Al does not open. During this time, contact R2A2 closes due to the energization of relay R2, and relay R1 self-holds. Further, by closing contact R2Al of relay R2, an energizing circuit for relay R3 at the next stage is prepared. Thereafter, relays R3 and below operate in order to perform self-holding in the same manner, and when relay R8 operates finally, relay R8 maintains itself by switching contact R8O, cuts off the electric path of the oscillation circuit, and therefore oscillates. The circuit section stops oscillating operation. Next, when start switch S is opened, relay R8 is restored and its contact R8A2 is restored and opened.

Therefore, relay R7 is disconnected, but capacitor C
After continuing to operate for a while due to the discharge flow caused by 7, it recovers and opens its contact R7A2. Similarly, relays R6 to R1 sequentially undergo delayed recovery and return to the initial state. For details, please refer to JP-A-53-34078, which discloses a relay circuit equivalent to the above-mentioned relay circuit. Conventional relays as explained above
Sequence circuits have the disadvantage that they have many circuit components and are complicated. That is, a large number of rectifying elements, capacitors, and resistors are used, each having a number roughly equal to the number of auxiliary relays, and the circuit configuration is complicated. Moreover, since capacitors and resistors vary in their capacitance values, the discharge time constant determined by the capacitor and resistor connected in parallel with the auxiliary relay coil of the unit relay circuit also varies depending on the unit relay circuit. Variations occur. In other words, the delay recovery time varies depending on the unit relay circuit,
As a result, there is a drawback that the time intervals in the stopping order of each relay vary. This invention was made to overcome the drawbacks of the prior art as described above, and the purpose of this invention is to simplify the circuit configuration and to eliminate variations in the time intervals in the stopping order of each relay. An object of the present invention is to provide a relay sequence circuit that eliminates the need for a relay sequence circuit.

The main point of the configuration of this invention is that when exciting the auxiliary relay in the unit relay circuit of the stepwise circuit section, the rated voltage value is applied as an excitation signal, and once the auxiliary relay is energized, even if the excitation signal disappears, the series resistance When the auxiliary relays are restored in sequence, the voltage applied to each auxiliary relay is short-circuited in sequence under the control of the oscillation operation of the oscillation circuit. The problem lies in the fact that it is configured to recover.

Next, embodiments of the present invention will be described in detail with reference to the drawings.

FIG. 2 is a relay circuit diagram showing an embodiment of the present invention.

This circuit is roughly divided into an oscillation circuit section and a stepping circuit section consisting of a plurality of (eight circuits in FIG. 2) unit relay circuits. Further, each unit relay circuit is composed of one auxiliary relay and one series resistor. Figure 3 shows the second
FIG. 3 is a relay circuit diagram of main parts for explaining the operation of the unit relay circuit in the figure. In a normal auxiliary relay, the ratio of the operating voltage value to the release voltage value is 2 to 3 in the case of direct current. Taking advantage of this, in the present invention, when exciting the auxiliary relay of a unit relay circuit, the rated voltage value is applied as an excitation signal, and once the auxiliary relay is excited, it is applied via the series resistor even if the excitation signal is no longer present. It uses a method to self-maintain at a voltage lower than the rated voltage. In Figure 3, for example, the power supply voltage is D
In ClOO, the rated voltage of the auxiliary relay R1 is 100, the operating voltage of the auxiliary relay R is 80V, the return voltage is 30V, and the resistance of the auxiliary relay R1 is 1KΩ, and the resistance value of the series resistor SRl is selected to be 1KΩ. When switching contact Sc is switched to the starting side (normally open side is closed), contact FR
By closing lA, the rated voltage is applied to the auxiliary relay R1, which is excited and self-maintained via the series resistor SR1. When contact FRlA opens in this state, the remaining 50 minutes of the power supply voltage divided by series resistor SRl will be applied to auxiliary relay R1, and this value is sufficiently higher than the return voltage of 30V of auxiliary relay R1. Therefore, the state of self-preservation will continue. At this time, the power consumed by the series resistor SRl and the auxiliary relay R1 is reduced by half compared to when the auxiliary relay R1 is excited at the rated voltage. Next, when the switching contact Sc is switched to the stop side (normally closed side is closed) and the contact FRlA is closed, both ends of the auxiliary relay R1 are short-circuited, so that the auxiliary relay R1 is demagnetized and the self-holding state is released. At this time, the series resistor SRl prevents a power short circuit. FIG. 4 is a time chart showing the operation of one embodiment of the present invention shown in FIG. 2, in which the transfer contact FRC performs switching operations alternately at predetermined flicker times T1 and T2 while the flicker relay FR is energized. Repeat.

In FIG. 4, the state in which the normally open side of the transfer contact FRc is closed is shown by a solid line. Therefore, the area between the solid lines indicates that the normally closed side is closed. Now, the operation of the embodiment of the present invention shown in FIG. 2 will be explained in detail with reference to FIG. 4.

First, when the start switch S is turned on, the auxiliary relay Rs is energized, the normally closed side of the transfer contact Rsc and the normally closed contact RSB are opened, and the normally open side of the transfer contact Rsc and the normally open contact RSA are closed. Therefore, the flicker relay FR is also excited. Therefore, the auxiliary relay R1 connects each transfer contact F.
The rated voltage is applied and excited through each normally closed side of RC, R8O, R6O, R4C, and R2C, and the series resistor SRL
A self-holding circuit is formed by closing the normally open contact RlA via. At the same time, the normally open side of transfer contact RlC is closed to prepare the excitation circuit for auxiliary relay R2 of the next stage unit relay circuit. If the normally open side of transfer contact FRC closes after the first flicker time T1, transfer contact R7
The auxiliary relay R2 is energized via the normally closed sides of O, R5C, and R3C and the normally open side of RlC, and forms a self-holding circuit by closing the normally closed contact R2A via the series resistor SR2.
Transfer contact R2C opens the normally closed side to open the excitation circuit of auxiliary relay R1, and closes the normally open side to prepare the excitation circuit for auxiliary relay R3 of the next stage unit relay circuit. Next, when transfer contact FRC switches to the normally closed side after flicker time T2, auxiliary relay R3 is energized, and relay R3 is connected to series resistor S by closing its normally open contact R3A.
A self-holding circuit is formed via R3. Transfer contact R3C opens the normally closed side to open the excitation circuit of auxiliary relay R3, and closes the normally open side to prepare the excitation circuit for auxiliary relay R4 of the next stage unit relay circuit. When the unit relay circuit at the last stage operates in a similar manner, the normally closed contact R8B of the auxiliary relay R8 opens in the example shown in FIG. 2, and the flip relay FR demagnetizes and stops operating. When the start switch S is opened, the auxiliary relay Rs is demagnetized, the normally open side of the transfer contact Rsc becomes the normally open contact RSA, and the normally closed side of the transfer contact Rsc and the normally closed contact RSB become closed. As a result, both ends of the auxiliary relay R8 in the example of FIG. 2 in the last stage unit relay circuit are the normally closed side of the normally closed contact RSB and the transfer contact FRcl, and the normally open side of the transfer contact R7C of the previous stage unit relay circuit. It is short-circuited and demagnetized, and self-holding is released by opening the normally open contact R8A.
At the same time, the normally closed side of transfer contact R8C is closed to prepare a degaussing circuit for auxiliary relay R7 of the unit relay circuit in the previous stage. Next, after the flicker time T1, transfer contact FRC
When the normally open side of the relay R7 closes, both ends of the auxiliary relay R7 are short-circuited through the normally closed side of the transfer contact R8C and the normally open side of the transfer contact R6C, so that the auxiliary relay R7 is demagnetized and the self-holding is released by the opening of the normally open contact R7A. At the same time, close the normally closed side of transfer contact R7C and close the auxiliary relay R6 of the previous unit relay circuit.
Prepare the degaussing circuit. Thereafter, the same operation is repeated and when the first stage unit relay circuit stops, the normally open contacts R and A of the auxiliary relay R1 open, and the flip relay FR is demagnetized and stops operating. In this way, when a unit relay circuit starts or stops, the condition is that the unit relay circuit in the previous stage of the unit relay circuit operates, and if the unit relay circuit is an odd numbered one, the operation of the unit relay circuit in the stage subsequent to the unit relay circuit is also a condition. The condition is that all even-numbered unit relay circuits are inoperable, and if the unit relay circuits are even-numbered, all odd-numbered unit relay circuits in subsequent stages are also inoperable. In the example shown in FIG. 2, the starting or stopping conditions are set for each transfer contact RlC to R8C, so the contacts of the auxiliary relay can be effectively used, which is practical. However, if there are a large number of unit relay circuits, and the number of contacts connected in series for use in the start or stop conditions described above increases significantly, and there is a risk of problems in terms of reliability of contact operation, The advance circuit section may be constructed as shown in FIG. FIG. 5 is a relay circuit diagram showing another embodiment of the invention.

In the stepwise circuit section shown in FIG. 5, the conditions for starting or stopping a unit relay circuit are only the operation of the previous stage of the unit relay circuit and the non-operation of the next stage of the unit relay circuit. To explain with an example, the conditions for starting or stopping a unit relay circuit including auxiliary relay R2 are that the preceding stage R1 relay operates and its normally open contact RlAl closes, and the next stage R3 relay is inoperative. Since the normally closed contact R3B is closed, the auxiliary relay R2 can be started or stopped by the transfer contact RXlCl or RXlC2. Therefore, as in the case of the embodiment shown in FIG. 2, there is a problem that the number of contacts connected in series for use as starting or stopping conditions for a unit relay circuit increases significantly, which may lead to a lack of reliability in contact operation. will be resolved. The portion of the oscillation circuit section shown in FIG. 5 surrounded by a dashed line is constructed as a replacement for the fritz relay FR in FIG.

That is, auxiliary relay RXl and its transfer contact RX
lC, auxiliary relay RX2 and its normally open contact RX2Al timer TXl for flicker time T1 and time limit operation of the timer normally open contact TXlAl timer TX for flicker time T2
2 and the time-limited normally closed contact TX2B of the timer are connected as shown. With such a configuration, the flicker times T1 and T2 can be easily changed,
Of course, it can also be directly connected to the stepwise circuit section shown in FIG. Next, the operation will be explained. When power is supplied to the circuit surrounded by the one-dot chain line in Fig. 5, the transfer contact R
Auxiliary relay RX2 is energized via the normally closed side of XIC,
Its normally open contact RX2A closes and timer TXl is energized. After flicker time T1, time-limited operation normally open contact TX
lA is closed and timer TX2 is excited. At the same time, the auxiliary relay RX1 is energized via the time-limited normally closed contact TX2B, and the relay RX1 is self-held on the normally open side of the transfer contact RX1C. The normally closed side of transfer contact RXlC opens, auxiliary relay RX2 is demagnetized, and its normally open contact RX2A
opens and timer TXl is demagnetized. Fritsuka Time T2
After that, the time-limited normally closed contact TX2B opens and the auxiliary relay R
Xl is demagnetized, transfer contact RXlC switches to the normally closed side, and returns to the initial state again. Repeat this operation thereafter. Transfer contacts RXlCl and RXlC2 are RXl
In conjunction with C, the switching operation is repeated at flicker times Tl and T2. The embodiments shown in Figs. 2 and 5 show cases where direct current is used as the power source, but in these circuits, rectifying elements and delay recovery are used to prevent loop rotation, as in the conventional example shown in Fig. 1. Since it does not use a capacitor as an element, it can also be applied to alternating current. Therefore, even if relatively long flicker times Tl and T2 are required, there is an advantage that an AC timer with a long set time that can be easily obtained can be used. In the embodiments shown in FIGS. 2 and 5, the number of contacts of the start switch S is increased by an auxiliary relay Rs, but the start switch S itself has one transfer contact, one normally open contact, and one normally closed contact. If so, the auxiliary relay R8 becomes unnecessary. FIG. 6 is a main relay circuit diagram showing still another embodiment of the present invention.

That is, FIG. 6 shows an embodiment in which two flicker relays FRl and FR2 having different flicker times for the start side and the stop side are used in the oscillation circuit section. FIG. 7 is a time chart of the operation, and as can be seen in FIG. 7, the limits of each of the flip times Tl, T2, T3 and T4 can be changed. FIG. 8 is a circuit diagram showing another example of the connection of the transfer contacts of the flip-flop relay.

In the embodiment shown in Fig. 2, transfer contacts FRC and FRCl are used as the contacts of the fritz relay FR, but if there is an odd number of unit relay circuits, only the transfer contacts FRC may be used as shown in Fig. 8a. . The same thing can be said for the embodiment shown in FIG. 5, and it is sufficient to do as shown in FIG.
The contact shown in the figure can be used. Normally open contact RS in Fig. 8 A and b
One transfer contact may be used instead of A and the normally closed contact RSB. FIG. 9 is a circuit diagram showing yet another example of connection of the transfer contacts of the fritscar relay. By changing the connections between the transfer contacts FRc and FRcl in the embodiment shown in FIG. 2 as shown in FIG. The auxiliary relay R8 of the unit relay circuit is demagnetized after the flicker time T1. If there is an odd number of unit relay circuits, a connection as shown in FIG. 9b may be used. In this case, normally open contact RSA and normally closed contact RS
A single transfer contact may be used instead of B. The same can be said for the embodiments shown in FIGS. 5 and 6. Providing a delay time before the start of operation in this way can be said to be one way to prevent erroneous operations. As explained above, according to the present invention, the rectifying elements in each unit relay circuit and the oscillation circuit section, and the delay recovery elements (capacitors, resistors) of the auxiliary relays are eliminated, and a common flip relay or timer is used in the oscillation circuit section. In addition, self-holding is not done by the normally open contact of the auxiliary relay in the next stage unit relay circuit as in the prior art, but by the normally open contact of the auxiliary relay itself in its own unit relay circuit. There is little intertwining between relay circuits, which simplifies the circuit and greatly reduces the number of components, resulting in improved reliability and reduced costs.

In addition, since the sequence interval is controlled by a common oscillation circuit for starting and stopping, the functionality is improved by making it easier and more uniform to change the interval time. Furthermore, the power consumption of the circuit can be reduced and it can also be applied to AC circuits. Note that this type of sequence circuit can be widely applied to starting and stopping multiple devices in sequence.

Examples include starting and stopping pumps in sequence, and supplying and releasing power to computers and their peripheral devices in a computer system in a predetermined order.

[Brief explanation of drawings]

FIG. 1 is a circuit diagram showing a conventional relay sequence circuit, FIG. 2 is a relay circuit diagram showing an embodiment of the present invention, and FIG. 3 is a circuit diagram showing the operation method of the unit relay circuit in FIG. It is a relay circuit diagram of the main part for explanation, and the fourth
The figures are time charts showing the operation of the embodiment of Fig. 2, Fig. 5 is a relay circuit diagram showing another embodiment of the invention, and Fig. 6 is a diagram showing still another embodiment of the invention. FIG. 7 is a time chart of the operation of the embodiment shown in FIG. 6, and FIG. 8 is a circuit diagram showing another example of connection of the transfer contacts of the fritscar relay. , FIG. 9 is a circuit diagram showing yet another example of connection of transfer contacts. In the figure, R1 to R8, RX, and RY are auxiliary relays, SR1 to SR7, SRX, and SRY are series resistors, S is a start switch, FR is a flip relay, RS is an auxiliary relay, TXl and TX2 are timers, RXl and RX2 indicates an auxiliary relay.

Claims (1)

[Scope of Claims] 1 Relay - A unit relay circuit which is a sequence circuit and is composed of (a) a series circuit of an auxiliary relay, a normally open contact of the relay that constitutes a self-holding circuit of the relay, and an impedance. n pieces (n is any integer) from the 1st stage to the nth stage
A stepper circuit section connected in parallel between one terminal and the other terminal of a power source as a stage, (b) a start switch, and two contacts that alternately switch at a constant period to perform contact operation. an intermittent operation type relay circuit having a transfer contact to selectively connect to a predetermined terminal of the power source and start the contact operation in response to turning on and opening of a starting switch. and (c) a side opposite to the side directly connected from one of the two contacts in the oscillation circuit section to one terminal of the power supply of the auxiliary relay of each odd-numbered unit circuit in the stepwise circuit section. (d) a first circuit that can extend from the other of the two contacts in the oscillation circuit section to the side through the contacts of the auxiliary relays of the even-numbered unit circuits; and a second circuit that can extend to the side opposite to the side directly connected to one terminal of the power source of the auxiliary relay of each level circuit through the contact of the auxiliary relay of the odd-numbered unit circuit, In the oscillation circuit section, the starting switch is turned on and the intermittent operation type relay circuit starts operating, and the transfer contact alternately switches at a constant period between the two contacts to perform contact operation, and as a result, the stepwise circuit In the section, the auxiliary relays in each unit relay circuit of the first stage to the nth stage are applied with the full voltage between one terminal and the other terminal of the power supply via the first circuit or the second circuit. It operates in order from the 1st stage to the nth stage, and the self-holding after operation is as follows.
In a self-holding circuit configured via a series impedance by closing a normally open contact in each unit relay circuit, the nth stage is Along with the operation of the auxiliary relay in the unit relay circuit, the intermittent operation type relay circuit in the oscillation circuit section is cut off from its operating circuit and stops operating, and then when the starting switch in the oscillation circuit section is opened, As the intermittent action relay starts operating again and the transfer contact alternately switches and contacts between the two contacts at a constant period, the nth to first stages in the stepwise circuit section are activated. The auxiliary relays in each unit relay circuit are short-circuited via the first circuit or the second circuit, so that the auxiliary relays in the first stage unit relay circuit are restored sequentially from the nth stage to the first stage. 1. A relay sequence circuit characterized in that upon restoration, the intermittent operation type relay in the oscillation circuit section has its operating circuit cut off and stops operating. 2. The relay sequence circuit according to claim 1, wherein the intermittent operation type relay circuit is configured by a combination of a timer and an auxiliary relay that can set an arbitrary time limit,
A relay whose intermittent operation cycle is arbitrarily variable.
sequence circuit. 3. The relay sequence circuit according to claim 1, wherein the intermittent operation type relay circuit in the oscillation circuit section is composed of two relays with different intermittent operation cycles,
A relay sequence circuit in which one side is used for sequential operation of auxiliary relays in each stage of unit relay circuits in a stepwise circuit, and the other is used for sequential recovery. 4. A relay sequence circuit according to any one of claims 1 to 3, in which one of the two contacts in the oscillation circuit section is connected to an odd-numbered stage in the stepwise circuit section. A first circuit that can extend to the auxiliary relay of each unit circuit is established under the condition that the unit relay circuit at the stage immediately preceding the stage in question operates and all the even-numbered unit relay circuits in stages subsequent to the stage in question do not operate. , a second circuit that can extend from the other of the two contacts in the oscillation circuit section to the auxiliary relay of each unit circuit in an even number of stages in the stepwise circuit section is connected to the operation of the unit relay circuit in the stage immediately preceding the stage concerned. A relay sequence circuit that is established on the condition that all odd-numbered unit relay circuits in subsequent stages are inoperable. 5. A relay sequence circuit according to any one of claims 1 to 3, in which one (or the other) of the two contacts in the oscillation circuit section is connected to the stepwise circuit section. A first (or second) circuit that can extend to the auxiliary relay of each unit circuit of odd-numbered stages (or even-numbered stages) in A relay sequence circuit that is established only on the condition of operation. 6. In the relay sequence circuit according to any one of claims 1 to 5, when the first-stage unit relay circuit starts operating in the stepwise circuit section, A relay sequence circuit in which when a stage unit relay circuit starts a recovery operation, it does not start immediately after the starting switch is turned on or off, but starts with a delay time.