JPH048195A - Automatic alternate operation control method and device, delay relay circuit and control relay circuit therefor - Google Patents

Abstract

PURPOSE:To prevent erroneous control operation and to simplify the constitution by lagging function of an auxiliary relay based on the self-holding operation of a load operating switch through a lagging relay. CONSTITUTION:A power supply circuit comprises a control switch CS, first and second load operating switches M1, M2 provided, respectively, with aux. (a) contacts M1a, M2a and aux. (b) contacts M1b, M2b, an aux. relay X provided with an (a) contact Xa and a (c) contact Xc, and a lagging relay DR provided with an (a) contact DRa, where the two load operating switches M1, M2 are switched with respect to a power supply in order to operate two loads automatically and alternately. According to the method, function of the aux. relay X is lagged by the self-holding function of the load operating switches M1, M2 through the lagging relay DR. Consequently, erroneous control is prevented and the constitution of the load operating switches M1, M2 is simplified.

Description

Detailed Description of the Invention [Industrial Application Field 1] The present invention relates to an automatic alternate operation control method and control device for alternately controlling the operation of two electric motor loads such as pumps, and an automatic alternate operation control method used in the method. The present invention relates to delay relay circuits and control relay circuits.

[Prior Art] The conventional automatic alternating operation control method and control device include:
There are two types in which the connection switching between the two motor loads to the power source is performed mechanically via a mechanical rotary cam such as a ratchet relay, and there is another type in which switching is performed electrically via a control switch and an auxiliary relay.

The latter one consists of the control circuit shown in Figure 3.
To explain this, E is an AC power supply and its power supply circuit R
3, the control switch C8 and the 1st. It is equipped with second load operation switches Ml, M2 and auxiliary relays ~X. The first load operation switch M1 is an auxiliary a contact Mlal
, Mla2 and an auxiliary contact Mlb, and the second load operation switch M2 has an auxiliary a contact M2a and an auxiliary contact M2.
auxiliary relay X has an a contact Xa and a c contact Xc. One end of the control switch C8 is connected to the R line side of the power supply circuit, and the other end is connected to the C contact Xc of the auxiliary relay X. One end of the first load operation switch M1 is connected to the control switch C8 via the normally closed contact of the C contact Xc of the auxiliary relay It is connected to the 3M side of the power supply circuit via the auxiliary contact M2b of the operation switch M2. One end of the second load operation switch M2 is connected to the control switch C8 via the normally open contact of the C contact Xc of the auxiliary relay It is connected to the S line side of the power supply circuit via the auxiliary contact M1b of the switch M1. Further, one end of the auxiliary relay
The other end is connected to the S line side of the power supply circuit via the auxiliary contact M2b of the second load operation switch M2.

Next, the operation of this control circuit will be explained. When control switch CS is turned on, R-C3-Xcc closing contact -Ml
-M2b-3 circuit is closed.

The first load operation switch M1 operates, and its auxiliary a contacts Mlal and M l a 2 close accordingly, and the operation of the first load operation switch M1 is self-maintained via the auxiliary a contact M1a1. Then, when the auxiliary a contact Mla2 closes, the circuit of R-Mla2-X-M2b-3 is closed, the auxiliary relay X operates, and the a contact Xa
is closed and the operation of the auxiliary relay X is self-maintained, and the connection of the C contact Xc of the auxiliary relay X to the power source is switched to the indoor contact side, and the C contact Xc selects the second load operation switch M2. However, at this time, since the auxiliary contact Mlb is open with the operation of the first load operation switch Ml, the second load operation switch M2 does not operate yet.

Next, when the control switch O8 is turned off, the energization to the first load operation switch M1 is released, the first load operation switch Ml releases its self-holding state, stops operating, and its auxiliary a contact and b contact return to their original state. Return. However, at this time, since the auxiliary contact M2b of the second load operation switch M2 is closed, the auxiliary relay X remains self-held via the a contact Xa, and therefore the normally open contact of the C contact Xc of the auxiliary relay is closed, and the C contact Xc selects the second load operation switch M2.

Next, when the control switch C8 is turned on again, the circuit of the R-C3-Xc normally-on contact M2-Mlb-s is closed, the second load operation switch M2 is operated, and accordingly, its auxiliary a contact M2a is closed, and the second load operation switch M2 is self-held. At this time, as the second load operation switch M2 operates, its auxiliary contact M2b opens.

Auxiliary relay X stops operating, and its A and C contacts return to their original state.

Next, when the control switch C8 is turned off again, the second load operation switch M2 loses its self-holding state due to the de-energization and stops operating, and its a contact and b contact return to their original states and return to their initial state. By repeating the above operations, the first. The two electric motor loads are automatically controlled to alternate operation via the second negative operation switches Ml and M2.

[Problems to be Solved by the Invention] However, the conventional automatic alternate operation control method and control device have the following problems because of the above configuration.

A. Ratchet relays that mechanically switch contacts via a mechanical rotating cam: 1) Since they utilize mechanical mechanisms, their structures are large and complex.

2) If one device experiences an overload failure during operation, there is no function to automatically switch the power connection to the other device.

3) If an attempt is made to provide the above function, the sequence circuit for load control will become complicated.

B. In the case where the contacts are electrically switched via the control switch and the auxiliary relay, ■) Since the auxiliary relay X is operated via the auxiliary C contact of the load operation switch, the operation of the auxiliary contact is Due to time variations (non-uniformity), the auxiliary relay may operate before the load operation switch is self-holding, resulting in a lack of reliability in the control operation of the alternate operation.

That is, in FIG. 3, when the first load operation switch M1 is energized and operated, the auxiliary contact M 1 a
If 2 closes earlier than Mlal, auxiliary relay As a result, the first load operation switch Ml cannot hold itself and its operation stops. At that time, if the operation of the auxiliary contact Mlb is slow,
The second load operation switch M2 may operate unexpectedly.

2) A pair of load operation switches each requires one C contact for self-holding and one B contact for energizing the other side, but one load operation switch also requires one for operating the auxiliary relay. Since one C contact is required, the structure of the load operation switch is complicated.

In addition, when using an electromagnetic switch or an electromagnetic contactor as a switch for load operation, the number of auxiliary contacts may be insufficient due to the motor capacity, and in this case, parallel to the switch for load operation (Ml in Figure 3) It is necessary to add one auxiliary relay to the structure, which also complicates the structure.

3) As in the case above, there is no function to automatically switch the power connection to the other if one has an overload failure.

The present invention has been made in view of the above circumstances, and aims to solve the problems of the above-mentioned prior art.

[Means for Solving the Problems] The present invention provides that the auxiliary relay operates before the scheduled load operation switch self-holds due to the nonuniform operation time of the auxiliary contacts of the load operation switch described above. In order to prevent control malfunctions in which the load operation switch is unable to self-hold, and to simplify the structure of the load operation switch, the control switch, auxiliary relay, and auxiliary contact are In an automatic alternating control method in which the connection of two load operation switches to a power supply is switched and the two loads are automatically operated alternately, the auxiliary relay is controlled from the self-holding operation of the load operation switch via a delay relay. It is designed to operate with a delay.

The control device includes a control switch, first and second load operation switches each having an auxiliary C contact and an auxiliary contact, an auxiliary relay having a C contact and a C contact, and a delay relay having a C contact. The power supply circuit includes a control switch connected in series with the C contact of the auxiliary relay, and a first load operation switch.

It is connected in series between the normally closed contact of the auxiliary relay C contact and the auxiliary contact of the second load operation switch, and is self-held by its own auxiliary C contact, and the second load operation switch is connected to the auxiliary relay C contact. is connected in series between the normally closed contact of the switch and the auxiliary contact of the first load operation switch, and the self-auxiliary C
The auxiliary relay is self-held by its own C contact, and the auxiliary relay is connected in series between the C contact of the delay relay and the auxiliary contact for second load operation, and is self-held by its own C contact.

The control switch and the auxiliary contact for second load operation are connected in series, and each is connected to a power source.

Furthermore, in order to provide a function of automatically switching the power connection to the other when one of them has an overload failure during operation, the control device includes the first. As the second load operation switch, an electromagnetic switch having an auxiliary C contact, an auxiliary contact, and a thermal relay B contact is used, and the first load operation electromagnetic switch is connected to the normally closed C contact of the auxiliary relay and the self-contact. The thermal relay is connected in series between the B contact of the thermal relay and the auxiliary contact of the second load operation electromagnetic switch, and is self-held by its own auxiliary C contact. It is connected in series between the normally closed contact of the C contact, the B contact of its own thermal relay, and the auxiliary contact of the electromagnetic switch for first load operation, and is self-held by its own auxiliary C contact. It is.

[Function 1] With the above configuration, when the first load operation switch is energized and operated through the control switch, the first load operation switch self-holds through its own auxiliary C contact. . At this time, the delay relay is also energized at the same time and operates, but its C contact closes after a certain period of time, so the auxiliary relay operates with a delay after the first load operation switch is held in its own state, and its own While self-maintaining via the C contact, the connection of the C contact is switched from the normally closed contact side to the normally closed contact side, and the C contact selects connection to the second load operation switch.

Next, turn off the control switch to stop the first load operation switch and return its auxiliary contact to its original state (at this time, the auxiliary relay remains self-holding), and then turn on the control switch again to stop the first load operation switch. The switch for 2-load operation operates and holds itself through its own auxiliary C contact. When the second load operation switch operates, its auxiliary contact opens, the auxiliary relay releases its self-holding state, and the auxiliary contact returns to its original state.The C contact selects connection to the first load operation switch, and the first Return to state.

As mentioned above, since the auxiliary relay operates not through the auxiliary contact of the load operation switch but through the auxiliary contact of the delay relay, the auxiliary relay operates before the first load operation switch is self-holding, and the first load A situation in which the operation switch cannot hold itself does not occur, and the alternate operation of the two loads is reliably controlled by repeating the on and off operations of the control switch.

Also, 1st. When using an electromagnetic switch that has the thermal relay as the second load operation switch and connects its b contacts in series, if one of the electromagnetic switches for load operation experiences an overload failure during operation, The B contact of the thermal relay connected to the auxiliary relay opens, the electromagnetic switch for load operation stops, and its auxiliary contact closes (at this time, the auxiliary relay's C
(the contact has selected connection to the other load operation switch), the other load operation switch is automatically operated to switch the load operation, and the load operation is not interrupted.

[Embodiment 1] An embodiment of the present invention will now be described with reference to the attached drawings FIGS. 1 and 2.

FIG. 1 shows a first embodiment of the present invention, and the same reference numerals as in FIG. 3 above are the same. 1st
In the figure, Ml and M2 are first and second load operation switches, and in this case, an electromagnetic switch having a thermal relay is used. Therefore, the first. The second electromagnetic switches M1 and M2 each have their own thermal relay b.
Auxiliary contacts M2b, M via contacts 49-1 and 49-2
Connected in series to lb. In addition, the first and second electromagnetic switches Ml and M2 each have one auxiliary C contact Mlal,
The first electromagnetic switch M1 has an auxiliary C contact M1a2 and one auxiliary C contact M1a2, unlike the one shown in FIG. DR is a contact DR
This is a delay relay with a, which is used to delay the operation of the auxiliary relay
It is connected in series with the auxiliary contact M2b of the electromagnetic switch M2, and in parallel with the first electromagnetic switch Ml. Auxiliary relay X connects one end to a contact DRa of delay relay DR.
The other end is connected to the S line side of the power supply circuit via the auxiliary contact M2b of the second electromagnetic switch M2. 1st. The first point is that the second electromagnetic switches Ml and M2 are connected to the control switch C8 via the C contact Xc of the auxiliary relay X. Second electromagnetic switch M1, M2
and auxiliary relay X are a contacts Mlal and M2a, respectively.
The points of self-holding via Xa and the like are the same as those shown in FIG. 3 above.

Note that the control switch C8 is a switch that is turned on and off by ground control, such as a water level relay.

However, in the control method or control device according to this embodiment, when the control switch C8 is turned on, R-
The circuit of C3-Xc normally closed contact-Ml-491-M2b-3 is closed, the first electromagnetic switch Ml operates, and the auxiliary a contact M1al closes and maintains itself. At this time, the circuit of R-C3-DR-M2 b-3 is also closed at the same time, and the delay relay also operates, but since its a contact DRa closes after a certain time delay, the auxiliary relay Afterwards, it operates with a delay, and the a contact Xa closes and holds itself, and the connection of the c contact Xc is switched from the normally closed contact side to the normally closed contact side to select the second electromagnetic switch M2. However, since the auxiliary contact of the first electromagnetic switch M1 is open, the second electromagnetic switch does not operate.

Next, when control switch C8 is turned off, the first electromagnetic switch stops operating and its auxiliary contacts M1a1 and Mlb return to their original state, but since auxiliary relay X is energized, interpolation relay It remains self-contained. Therefore, the normally closed contact of the C contact Xc is closed.

When control switch C8 is turned on again, R-C
Since the circuit of 3-Xc normally open contact-M'2-49-2-Mlb-3 becomes closed, the second electromagnetic switch M2 operates and is self-held by its own auxiliary a contact M2a, and the auxiliary Contact M2b opens and energization to auxiliary relay X is released, auxiliary relay X stops operating, and its auxiliary contacts
c returns to its original state. Therefore, the normally closed contact of the C contact Xc is closed to select connection to the first electromagnetic switch Ml. However, since the auxiliary contact M2b of the second electromagnetic switch M2 is open, the first electromagnetic switch M1 does not operate.

Next, when the control switch C8 is turned off again, the second electromagnetic switch M2 stops operating, and its auxiliary contact M2
a and M2b return to their original state.

In this way, the auxiliary relay
Self-retention of the load is ensured, and therefore, the alternating operation of the two loads is reliably controlled by repeating the on and off operations of the control switch.

Furthermore, if an overload failure occurs while the first electromagnetic switch M1 is in operation, the B contact 49-1 of the thermal relay opens and the energization to the first electromagnetic switch ML is released. The switch Ml stops operating, its auxiliary contact returns to its original state, and the auxiliary contact Mlb closes, so that the second electromagnetic switch M2 is automatically energized and the operation is switched to the second load.

FIG. 2 shows another embodiment of the present invention, in which the delay relay DR in the embodiment of FIG. 1 is formed by a delay relay circuit DR' formed by an electronic circuit.
and the auxiliary relay X shown in Fig. 1 are integrally connected on a printed wiring board, and five external connection terminals 1 to 5 connected to an external control sequence circuit are led out from this coupling circuit. 8 was used.

In the figure, the delay relay circuit DR' surrounded by a broken line includes an input section, a charging section, and a charging voltage detection section.

It consists of an output section. This input section converts an AC voltage input signal from an external sequence circuit into a DC weak current signal, and connects an AC capacitor C1 and a surge current limiting resistor R1 in series to the AC side of the diode bridge V. There is. The charging section has an electrolytic capacitor C2 and a discharging resistor R2 connected in parallel to the rectifying side of the diode bridge ■.The weak current signal from the input section is integrated by the capacitor C2 to provide a delay function, and also to provide a delay function when the signal is turned off. In this case, the discharge is ensured through the discharge resistor R2.

The charging voltage detecting section has a trigger diode D, a gate series resistor R3, and a gate parallel resistor R4 connected in series to the rectifying side of the diode bridge V, and detects the charging voltage of the electrolytic capacitor C2 of the charging section and performs the following steps as described below. This triggers the thyristor SCR in the output section. The output section includes a drive current limiting resistor R5, one light emitting diode L, and a phototriac coupler TP on the rectifying side of the diode bridge ■.
The light emitting side 6 of the thyristor SCR is connected in series with the thyristor SCR, the gate of the thyristor SCR is connected to the gate series resistor R3 of the charging voltage detection section, and the varistor 2 is connected to the light receiving side 7 of the phototriac coupler TP. The varistor 2 is connected in parallel to the a contact Xa of the auxiliary relay X to operate the auxiliary blade relay.

The above-described charging section, charging voltage detecting section, and output section are connected in parallel to each other on the rectifying side of the diode bridge (2).

The auxiliary relay X has an A contact Xa for self-holding and a C contact Xc for connection switching. - 8 surrounded by a dotted chain line is a control relay circuit in which the delay relay circuit DR' and an auxiliary relay X having an auxiliary contact are integrally connected on a printed wiring board.

Reference numerals 1 to 5 are external connection terminals provided in the control relay circuit 8, which connect the control relay circuit 8 to an external load control Silkens circuit. The first terminal l of the external connection terminal is
The surge current control resistor R1 is connected to one end of the AC side of the diode bridge ■ together with the AC capacitor C1, and the auxiliary relay
Connect the other end of the AC side to the C contact Xc of the auxiliary relay
Third. The fourth terminal 3.4 is connected to the normally closed contact and the normally open contact of the C contact Xc, respectively, and the fifth terminal 5 is connected to the varistor Z.
and the a contact Xa of the auxiliary relay X are connected to a parallel circuit. These external connection terminals 1 to 5 are connected to the external sequence circuit, with terminal 1 connected to the b contact M2b of the second electromagnetic switch M2, terminal 2 connected to the control switch C8, and terminal 3 connected to the first electromagnetic switch M2. M1, terminal 4 is the second
A terminal 5 of the electromagnetic switch M2 is connected to the R line side of the power supply circuit.

The control method or operation of the control device according to this embodiment will now be explained.

When control switch C8 is turned on, terminal 2, normally closed contact of C contact Xc of auxiliary relay X, terminal 3, thermal relay B contact 49-1 of first electromagnetic switch Ml. The first electromagnetic switch Ml is energized via the b contact M2a of the second electromagnetic switch M2, and the first electromagnetic switch Ml operates and is self-held via its own a contact M l a 1 . At this time, since AC voltage is input between terminals 1 and 2, diode bridge ■ - AC capacitor C1 - surge current limiting resistor R
A weak alternating current flows through the input section of 1. Then, the same full-wave rectified DC weak current flows through the rectifying side circuit of the 5-diode bridge ■, which slowly charges the electrolytic capacitor C2. The surge current limiting resistor R1 limits the surge current. The resistance value is selected to be small.
The charging current is determined by the impedance of the AC capacitor CI.

The charging potential of electrolytic capacitor C2 is the trigger diode D.
When the break voltage is reached, a trigger current flows from the trigger diode D to the gate series resistor R3 to the gate of the thyristor SCR, and the thyristor SCR becomes conductive. Trigger diode D has negative characteristics and reliably triggers thyristor SCR.

When thyristor SCR conducts, drive current limiting resistor R5 - light emitting diode L - phototriac coupler T
Current flows from the P light emitting side 6 to the thyristor SCR, the light emitting diode L lights up, the phototriac coupler TP output side 7 becomes conductive, the auxiliary relay X operates via the varistor Z, and the auxiliary relay The contact Xa maintains itself, and the connection of the C contact Xc is switched from a normally closed contact to a normally open contact. The operation of the auxiliary relay
This is done after self-preservation via 1 a 1.

In the above operation, the current flowing to the phototriac coupler TP light emitting side 6 is initially the sum of the full-wave rectified DC weak current supplied from the rectifying side of the diode bridge V and the discharge current of the electrolytic capacitor c2, Eventually, the electrolytic capacitor C2 is discharged and only a weak current is supplied from the diode bridge ■, but the delay relay circuit DR'
Since the output conduction time is sufficient for the self-holding time of the auxiliary relay X, the supplied weak current may be less than the trigger current of the phototriac coupler TP.

Next, when the control switch C8 is turned off, the first electromagnetic switch M1 is de-energized and the first electromagnetic switch Ml stops. Also, the power to the diode bridge V is removed and the thyristor SCR is also turned off, but the auxiliary relay
Contact Xa, terminal 5, b contact M2b of second electromagnetic switch M2
Since it is self-retained via
Connection to electromagnetic switch M2 is selected.

When control switch C8 is turned on again, terminal 2.
Inter-chamber contact of c contact Xc, thermal relay b contact of second electromagnetic switch M2 49-2. B contact M of the first electromagnetic switch M1
The second electromagnetic switch M2 is energized via the lb, and the second electromagnetic switch M2 operates and is self-held by its own a contact M 2 a. At this time, a back electromotive force is generated at both ends of the auxiliary relay X due to the opening of the b contact M2b associated with the operation of the second electromagnetic switch M2.
Since the circuit X-R1 is closed, current flows through the auxiliary relay X until the energy stored in the capacitor CI and the coil of the auxiliary relay X is consumed, and therefore the stopping of the auxiliary relay X is delayed. Therefore, after the second electromagnetic switch M2 is self-held via the auxiliary A contact M2a, the auxiliary relay Switch M2 securely holds itself.

Next, when the control switch O8 is turned off again, the second
The energization to the electromagnetic switch M2 is canceled and the second electromagnetic switch M
2 stops and its auxiliary contact returns to its original state.

Furthermore, due to the presence of thermal relay contacts 49-1 and 49-2, if one electromagnetic switch fails due to overload during operation, the load operation is automatically switched to via the other electromagnetic switch. , similar to that of the embodiment of FIG.

[Effect of the Invention 1] Since the present invention has the above-described configuration, the problems of the prior art described above are solved and the following effects are achieved.

1) Compared to conventional ratchet relays that operate alternately by switching contacts using a mechanical rotary cam, the structure is simpler and the reliability of operation is higher.

In addition, compared to conventional control switches and auxiliary relays that electrically switch contacts and operate alternately, the load operation switch does not require an A contact to operate the auxiliary relay, and it The configuration is simple because there is no need to add one auxiliary relay when the number of auxiliary contacts of the switch is insufficient due to motor capacity.

2) As in the past, the auxiliary relay is set to a of the load operation switch.
Since it is operated not through contacts but through a delay relay, the auxiliary relay is able to self-hold the load operation switch due to the unevenness of the operation time of the auxiliary contact of the load operation switch as in the conventional case. To ensure that the load operation switch can be self-retained without fear of failure in control operation due to the load operation switch not being able to self-retain due to previous operation, and to ensure alternating operation control. I can do it.

3) If an electromagnetic switch with a thermal relay is used as a load operation switch, use the b contact of the thermal relay.

If one electromagnetic switch experiences an overload failure during operation, the contacts are automatically switched and the other electromagnetic switch can be operated. Can be repaired.

4) As a delay relay for operating an auxiliary relay that switches contacts for the load operation switch, a delay relay circuit is provided using an electronic circuit consisting of the input section, charging section, charging voltage detection section, and output section. When used, the self-holding of the first load operation switch is ensured, and the energy stored in the capacitor of the input section and the coil of the auxiliary relay is used when the second load operation switch is operated. Since the switching operation of the C contact of the auxiliary relay can be delayed, the integrity of the self-holding of the second load operation switch can be ensured, and further reliability of the control operation can be expected.

In this case, generally AC200 is connected to both ends of the input section.
The control voltage of the high-voltage load operation switch of V is applied, but due to the configuration of the input section in which a capacitor and a diode bridge are connected in series, energy is transferred from the high-voltage input power source to a low-current DC power source that is full-wave rectified. can be efficiently converted without consuming Therefore, by connecting a charging section including a delay capacitor in parallel to the input section and operating the output section by detecting the charging potential, a highly reliable delay relay circuit can be constructed simply and easily. can.

Furthermore, in this case, when the phototriac coupler in the output section is in operation, its output side is short-circuited by the A contact of the auxiliary relay, so no current flows to the output side triac, so the phototriac coupler has a small capacity. Anything is fine.

5) The delay relay circuit and the auxiliary relay having auxiliary contacts are connected together on a printed wiring board, and the required number of external connection terminals for connection to an external control sequence circuit are arranged in this combined circuit to control the circuit. When used as a relay circuit,
It can be quickly and easily incorporated into an external control sequence circuit, is compact, and has high reliability in control operation.

[Brief explanation of the drawing]

1 and 2 show an embodiment of the present invention,
FIG. 1 is a control circuit diagram of a control device according to a first embodiment, FIG. 2 is a control circuit diagram of a control device according to a second embodiment, and FIG. 3 is a control circuit diagram of a conventional control device. It is. C8; Control switch Ml, first load operation switch (electromagnetic switch) M2: Second load operation switch (electromagnetic switch) M l a 1
; 1st load operation switch auxiliary a contact Mlb, 1st load operation switch auxiliary contact M 2 a; 2nd load operation switch auxiliary a contact M2b, 2nd load operation switch auxiliary contact X; auxiliary relay xa ; Auxiliary relay A contact xc; Auxiliary relay C contact DR; Delay relay DRa; Delay relay A contact 49-1, 1st electromagnetic switch thermal relay B contact 49
-2, 2nd electromagnetic switch thermal relay b contact E; Control power supply R, S; Power line C1, AC capacitor R1; Surge current limiting resistor ■; Diode bridge C2; Electrolytic capacitor R2, discharge resistor D; Trigger diode R3 , gate series resistance R4, gate parallel resistance R5, drive current limiting resistance L; light emitting diode TP; phototriac coupler Z; varistor 6; phototriac coupler light emitting side 7; phototriac coupler light receiving side DR', delay relay circuits 1 to 5 ;External connection terminal 8;Control relay circuit diagram

Claims (1)

[Claims] 1. An automatic alternate operation control method that switches the connection of two load operation switches to a power source via a control switch, an auxiliary relay, and an auxiliary contact, and automatically causes the two loads to operate alternately. An automatic alternate operation control method, characterized in that the auxiliary relay is operated later than the self-holding operation of the load operation switch via a delay relay. 2. A control switch, first and second load operation switches each having an auxiliary A contact and an auxiliary B contact;
A power supply circuit is equipped with an auxiliary relay having an a contact and a c contact, and a delay relay having an a contact. The switch is connected in series between the normally closed C contact of the auxiliary relay and the auxiliary B contact of the second load operation switch, and is self-held by its own auxiliary A contact. relay c
The auxiliary relay is connected in series between the normally open contact of the contact and the auxiliary B contact of the first load operation switch, and is self-held by its own auxiliary A contact, and the auxiliary relay connects the delay relay's A contact and the second load operation switch The delay relay is connected in series between the control switch and the auxiliary B contact of the second load operation switch, and the delay relay is connected in series between the control switch and the auxiliary B contact of the second load operation switch, and the delay relay is connected in series between the control switch and the auxiliary B contact of the second load operation switch. An automatic alternating operation control device characterized by being connected. 3. The first and second load operation switches are respectively auxiliary a
It is an electromagnetic switch having a contact, an auxiliary b contact, and a thermal relay b contact, and its first load operation electromagnetic switch is:
The normally closed contact of the auxiliary relay's C contact is connected in series with the B contact of its own thermal relay and the auxiliary B contact of the electromagnetic switch for second load operation, and is self-held by its own auxiliary A contact. The electromagnetic switch for 2-load operation is connected to the auxiliary relay c.
It is characterized by being connected in series between the normally open contact of the contact, the B contact of its own thermal relay, and the auxiliary B contact of the electromagnetic switch for first load operation, and self-maintained by its own auxiliary A contact. The automatic alternate operation control device according to claim 2. 4. As a delay relay, there is an input section in which a capacitor, a resistor, and the AC side of a diode bridge are connected in series, a charging section in which an electrolytic capacitor and a discharge resistor are connected in parallel, and a trigger diode, a gate series resistance, and a gate parallel resistance are connected in series. A charging voltage detecting section connected to the charging voltage detecting section, a drive current limiting resistor, a light emitting diode, a phototriac coupler, the light emitting side, and a thyristor are connected in series, and the gate of this thyristor is connected to the gate series resistor of the charging voltage detecting section, and the phototriac coupler light receiving side is connected in series. The delay relay circuit is equipped with an output section connected to a varistor connected to an auxiliary relay on the side, and the charging section, the charging voltage detection section, and the output section are connected in parallel to the rectifying side of the diode bridge. The automatic alternating operation control device according to claim 2 or 3, characterized in that: 5. An input section in which a capacitor and a resistor are connected in series to the AC side of the diode bridge, a charging section in which an electrolytic capacitor and a discharge resistor are connected in parallel, and a charging section in which a trigger diode, a gate series resistor, and a gate parallel resistor are connected in series. The voltage detection section, the drive current limiting resistor, the light emitting diode, the phototriac coupler, the light emitting side, and the thyristor are connected in series, and the gate of this thyristor is connected to the gate series resistance of the charging voltage detection section, and an auxiliary relay is connected to the phototriac coupler light receiving side. 2. The automatic alternating operation control according to claim 1, further comprising: an output section connected to a varistor connected to the charging section, said charging section, said charging voltage detecting section, and said output section being connected in parallel to a rectifying side of a diode bridge. A delay relay circuit for automatic alternating operation control used in the method. 6. An input section with a capacitor and a resistor connected in series to the AC side of the diode bridge, a charging section with an electrolytic capacitor and a discharge resistor connected in parallel, and a charging section with a trigger diode, gate series resistor, and gate parallel resistor connected in series. A voltage detection section, a drive current limiting resistor, a light emitting diode, a phototriac coupler, the light emitting side, and a thyristor are connected in series, and the gate of this thyristor is connected to the gate series resistance of the charging voltage detection section, and a varistor is connected to the light receiving side of the phototriac coupler. A delay relay circuit has a connected output section, and the delay relay circuit has the charging section, the charging voltage detection section, and the output section connected in parallel to the rectifying side of the diode bridge, and an auxiliary relay having an a contact and a c contact. A first circuit in which the varistor of the output part of the relay circuit is connected in parallel to the a contact of the auxiliary relay and connected to the first and second sequence circuits for load control.
~The fifth external connection terminal is connected to the resistor, the first terminal of which is connected to the AC side of the diode bridge along with the capacitor, and the second
The terminal is on the other side of the AC side of the diode bridge, and the third
The terminal is connected to the normally closed C contact of the auxiliary relay, the fourth terminal is connected to the normally open C contact of the auxiliary relay, and the fifth terminal is connected to the A contact of the auxiliary relay connected in parallel with the varistor. Used in the automatic alternate operation control method according to claim 1, characterized in that the auxiliary relay is connected to the first terminal, and the C contact of the auxiliary relay is connected to the second terminal, and these are connected integrally on a printed wiring board. Control relay circuit for automatic alternating operation control.