JPS6040130B2 - Alternate operation relay device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION This invention operates two pumps alternately each time a signal from a water level detection device installed in a water tank is input. This invention relates to an alternate operation relay device for supplying water to a water tank, draining water, etc.

The conventional relay device for alternate operation, as shown in Fig. 1,
an external contact 4; first and second load power supply electromagnetic contactors 6, 7 that supply power to their own windings in response to the closure of the external contact 4; The external contact 4 is formed by inserting and connecting the first and second contacts 5c and 5d, which open and close complementary to each other, between the windings of the second load power supply electromagnetic contactors 6 and 7. It is provided with an alternating operation circuit section D in which the opening and closing states of the first and second rocky points 5c and 5d are reversed each time.

To explain in more detail, AC200V or ACIOO
When an external contact 4 such as a floatless relay contact inserted in series between the AC power supply 1 of V and the power supply circuit section 1 is connected, power is not supplied to the power supply circuit section 1 and the two-winding latching relay is connected. Contacts 5a and 5c of -5 maintain the open state, and contacts 5b and 5d of the two-winding latching relay 5 maintain the closed state, so that no power is supplied to the windings of the electromagnetic contactors 6 and 7, and the motor The load power supply contacts for supplying power to the other devices are both open.

When the external contact 4 is closed, the excitation winding of the electromagnetic contactor 7 is energized from the AC power supply 1 through the external contact 4 and the contact point 5d, and the load power supply contact is connected to the closed rear wheel hse of the external contact 4.
It is closed within c and power is supplied to one of the loads.

At the same time, the AC power supply 1 is converted to a DC voltage by the transformer 8, the bridge rectifier 9, and the capacitor 10, and this DC voltage passes through the diode 11, the contact 5b, and the reset winding RS of the two-winding latching relay 5 to the capacitor 12. is charged and stands by for switching of the two-winding latching relay 5. In this case, the two-winding latching relay 5 does not change state. Thereafter, when the external contact 4 is opened, power supply to the excitation winding of the electromagnetic contactor 7 is stopped, and the load power supply contact is opened to stop power supply to one load.

At the same time, the power supply to the power supply circuit section 1 is also stopped, a base current flows through the transistor 15 through the diode 13 and the resistor 14, the transistor 15 is turned on, and the charge in the capacitor 12 is transferred to the reset coil RS of the two-winding latching relay 5. It is discharged through the diode 13 and the transistor 15, and this discharge current reverses the two-winding latching relay 5, so that the contacts 5a and 5c are in the closed state, and the contact 5 is in the closed state.
b and 5d become open and maintain this state. In this case, since the capacitor 16 is connected between the base and emitter of the transistor 15, when the external point 4 becomes involved, current first flows into the capacitor 16 from the large capacity capacitor 12, and the capacitor 16 becomes the gutter as shown in the figure. When the charging voltage of this capacitor 6 reaches a threshold and exceeds this value, the transistor 15 is turned on for the first time, and the charge of the capacitor 2 is discharged through the set coil RS, the diode 13 and the transistor 15.
The capacitor 16 serves to delay the turning on of the transistor 15. As a result, after the electric charge of the small capacitor 10 is sufficiently discharged and the base potential of the transistor 15 is sufficiently lowered, the base current is supplied to the transistor 5 from the capacitor 12, and the transistor 15 is suddenly turned on. This causes the charge in the capacitor 12 to be rapidly discharged, thereby ensuring the switching operation of the two-winding latching relay 5. In addition, if capacitor 1
6, the base potential of the transistor 15 would remain high for some time after the external contact 4 is turned off due to the residual charge in the capacitor 10, so even if the external contact 4 is turned off, the transistor 5 would not turn on suddenly. Instead, the impedance gradually decreases, and therefore 2
The current flowing through the reset coil RS of the wire-wound latching relay 5 is also small, and there is a problem that the switching operation of the two-winding latching relay 5 is uncertain.

When the external contact 4 is opened again, the excitation winding of the electromagnetic contactor 6 is energized from the AC power supply 1 through the external contact 4 and the contact 5c, and the load power supply contact is turned on after the external contact 4 is closed.
It is opened within 0hsec and power is supplied to other loads.

At the same time, the AC power supply 1 is converted into a DC voltage by the transformer 8, the bridge rectifier 9, and the coso capacitor 10, and this DC voltage passes through the diode 11, the contact 5a, and the set winding S of the two-winding latching relay 5 to the capacitor 17. is charged and stands by for switching of the two-winding latching relay 5. In this case, the two-winding latching relay 5 does not change state. Thereafter, when the external contact 4 engages, power supply to the winding of the electromagnetic contactor 6 is stopped, and when the load power supply contact engages, power supply to other loads is stopped.

At the same time, the power supply to the power supply circuit section 1 is also stopped, a base current flows through the transistor 15 through the diode 18 and the resistor 14, the transistor 15 is turned on, and the charge in the capacitor 12 is transferred to the set coil S of the two-winding latching relay 5. It is discharged through the diode 18 and the transistor 15, and this discharge current reverses the two-winding latching relay 5 so that the contacts 5a and 5c are in the open state and the contacts 5b and 5c are in the open state.
5d enters the closed state and maintains this state. In this case, since the capacitor 16 is connected between the base and emitter of the transistor 15, when the external contact 4 is involved,
First, current flows into the capacitor 16 from the large capacity capacitor 17, and the capacitor 16 is charged to the polarity shown in the figure.
When the charging voltage of this capacitor 16 rises and exceeds the value, the transistor 15 is turned on for the first time, and the electric charge of the capacitor 7 is discharged through the set coil S, the diode 18 and the transistor 5. This has the effect of delaying the turning on of the As a result, the base current is supplied to the transistor 15 from the capacitor 17 after the electric charge of the small capacitor 10 is sufficiently discharged and the base potential of the transistor 5 is sufficiently lowered, and the transistor 5 is suddenly turned on. This causes the charge in the capacitor 17 to be rapidly discharged, thereby ensuring the switching operation of the two-winding latching relay 5. Thereafter, the above-described operation is repeated in response to opening and closing of the external contact 4.

However, such conventional alternating operation relay devices do not operate when the electromagnetic contactors 6 and 7, which should normally operate when an external signal (opening/closing the external contact 4) is applied, do not operate due to an accident or failure. It was not possible to supply power to pumps, etc., and reliability was not very high.

Therefore, it was only after a situation such as a water outage occurred that the equipment was found to be malfunctioning and had to be dealt with, resulting in a large impact from accidents and malfunctions. Therefore, an object of the present invention is to enable the electromagnetic contactor to operate in place of the other load-feeding electromagnetic contactor when the other load-feeding electromagnetic contactor fails to operate due to a failure or the like. To provide a highly reliable relay device for alternate operation that does not cause problems due to equipment failure.

An embodiment of this invention is shown in FIG.

That is, this relay device for alternate operation is different from the one shown in FIG.
. This automatic reversing circuit section m is inserted between the power supply circuit section 1 and the alternating operation circuit section 0, and when the external contact 4 is open as shown in the figure, the automatic reversing circuit section plate or It doesn't work. When the external contact 4 closes, normally closed contacts 6a of the electromagnetic contactors 6 and 7
, 7a for about 5 hours after the external contact 4 is closed.
ec, the capacitor 20 is not charged,
Therefore, the transistor 21 is off, the base current flows through the transistor 22 through the resistor 23, the transistor 22 becomes normal, power is supplied from the power supply circuit section 1 to the alternating operation circuit section 0', and the same operation as shown in FIG. 1 is performed. . In addition, when the external contact 4 is closed, if one of the electromagnetic contactors 6 and 7 that should operate due to tripping of the Samar relay or failure of the sequence circuit does not operate, the normally closed contact 6a
, 7a are both closed and the terminals 19A and 19B are short-circuited, the capacitor 20 is charged through the resistor 24, and when this charging voltage exceeds the Jenner voltage of the Jenner diode 25, the transistor is connected through the resistor 26. A base current flows through the transistor 21, turning on the transistor 21, turning off the transistor 22, and stopping power supply to the alternating operation circuit section (B). As a result, the state of the two-winding latching relay 5 in the same machine is reversed from when the external acid point 4 was engaged, the other of the electromagnetic contactors 6 and 7 is activated, and the terminals 19A and 1
98 will be opened, capacitor 20 will be discharged through resistor 27, transistor 21 will be turned off, transistor 22 will be turned on, and power will be supplied to alternating circuit section B again. Note that this device is normal when the external support point 4 is closed, and the electromagnetic contactor 6,
Even when power is stopped due to a thermal trip or the like while power is being supplied to one of the windings of 7, it operates in the same manner as described above, and the rest is the same as that shown in FIG. As described above, the alternating operation relay device of this embodiment detects the inoperation of both the electromagnetic contactors 6 and 7 when the external contact 4 is opened, and reverses the state of the alternating operation circuit section (b). Electromagnetic contactor 6
, 7, when the one that should be activated does not operate, the other electromagnetic contactors 6 and 7 can be activated. Therefore, even in the event of a malfunction, water supply or drainage will continue, resulting in inconveniences such as water outages. does not occur. However, it is necessary to separately install a failure indicator to detect failures. Another embodiment of the invention is shown in FIG.

That is, this relay device for alternate operation includes an external contact 4 and first and second load power supply electromagnetic contactors 6 and 7 that supply power to their own windings in response to the closing of the external contact 4. ,
First and second contacts 28a and 29a, which open and close complementary to each other, are inserted and connected between the external contact 4 and the windings of the first and second load power supply electromagnetic contactors 6 and 7, respectively. and an alternate operation circuit section 0' in which the open/close states of the first and second contacts 28a and 29a are reversed each time the external contact 4 is engaged; and an inverting circuit section m' which detects non-operation of both the electromagnetic contactors 6 and 7 and provides a signal corresponding to opening of the external contact 4 to the alternating operation circuit 0'. To explain in more detail, when an external acid point 4 such as a floatless relay contact inserted in series between the AC200V or ACIOOV AC power supply 1 and the power supply circuit section 1 is connected, the windings of the electromagnetic contactors 6 and 7 are connected. The lines are not powered and both their load powering contacts are open.

Also, regardless of whether the external contact 4 is opened or closed, the AC power source 1 is converted into DC by the transformer 8, bridge rectifier 9, and capacitor 10' of the power supply circuit section 1, but when the external contact 4 is opened, the inverting circuit section m' transistors 30 and 31 are off, and one of the Q output and Q output of the D flip-flop 32 of the alternating operation circuit section B', for example, Q
The output is at a low level and the Q output is at a high level, and they are passed through inverters 33 and 34 to transistors 35 and 36
, transistors 35 and 36 are turned on and off, respectively, and relay 2 of relays 28 and 29
However, since the transistor 31 is off, the contacts 28a and 29a are both connected. When the external acid point 4 is closed, power is supplied to the bridge rectifier 38 through this external contact 4 and the resistor 37, and its DC output causes the capacitor 39 to output the resistor 4 and cause the base current to rise. flows into the transistor 31 and the resistor 42 turns on.
A base current flows through the transistor 31, turning on the transistor 31, and energizing the relay 28 from the power supply circuit section 1. The contact 28a is closed and the winding of the electromagnetic contactor 6 is energized, and this electromagnetic contactor The load power supply contact No. 6 is closed and power is supplied to the load.

At this time, the capacitor 43 is charged through the resistors 44 and 45, and the normally open contact 6a of the electromagnetic contactor 6 is also opened.
Therefore, the capacitor 46 is not charged and the transistor 47 is in an off state, and this state continues until the external contact 4 is engaged. Thereafter, when the external contact 4 is opened, the energization to the winding of the electromagnetic contactor 6 is stopped, the load power supply contact is engaged, and the normally closed contact 6a is closed.

Furthermore, the power supply to the bridge rectifier 38 is also stopped, the capacitor 39 is discharged through the resistor 48, and after a certain period of time, the transistor 30 is turned off, and therefore the transistor 31 is also turned off. As a result, the capacitor 43 is discharged through the resistor 49, and the voltage drop of the capacitor 43 is passed through the inverter 50 and the Schmitt circuit 51 to the
It is applied as a rising signal to the CP terminal of the flip-flop 32, thereby inverting the Q and Q outputs of the D flip-flop 32 and enabling the winding of the relay 29 to be energized.
At this time, since transistor 31 is off, contact 2
Both 8a and 29a are open. When the external contact 4 closes again, the reversing circuit section m' and the alternating operation circuit section 0'
performs the same operation as described above, and relay 2 is connected from power supply circuit section 1.
9 is energized, the contact 29a is closed and the winding of the electromagnetic contactor 7 is energized, and the load power supply contact of the electromagnetic contactor 7 is closed to supply power to the load.

In this case, the normally closed contact 6a of the electromagnetic contactor 6 opens instead of the normally closed contact 7a. When the external contact 4 is opened again,
At the same time as the power supply to the winding of the electromagnetic contactor 7 is stopped and its load power supply contact is opened, a rising signal is applied to the CP terminal of the ○ flip-flop 32 as described above, and the D flip-flop 32 is inverted. Return to the initial state.

Now, due to a malfunction or the like, one of the electromagnetic contactors 6 and 7 that should operate when the external coin point 4 is closed does not operate, and the normally closed contact 6a
, 7a both remain closed, the resistor 5
2, the capacitor 46 is charged, and the capacitor 46
When the voltage of A rising signal is applied to the CP terminal of the D flip-flop 32, the Q and Q outputs of the D flip-flop 32 are inverted, and the other of the electromagnetic contactors 6 and 7 is activated.

As a result, either normally closed contact 6a or 7a becomes involved, and capacitor 46 is discharged through resistor 56. The effects of this embodiment are similar to those of the previous embodiment.

As described above, the alternate operation relay system of the present invention includes an external contact, and first and second load power supply electromagnetic contactors that supply power to their own windings in response to the closing of the external contact. and,
First and second contacts that open and close in a complementary manner are inserted and connected between the external contact and the windings of the first and second electromagnetic contactors for load power supply, respectively, and the external contact is opened. an alternating operation circuit section in which the open/close states of the first and second contacts are reversed each time the external contact is closed; Since it is provided with an inversion circuit section that reverses the opening and closing of the first and second contacts of the alternating operation circuit section, when one of the load power supply electromagnetic contactors that should be operated does not operate due to a failure or the like, The reversing operation by the reversing circuit allows the other load power supply electromagnetic contactor to be operated instead, and there is an advantage that there is no problem due to failure of the electromagnetic contactor, and reliability is high.

[Brief explanation of the drawing]

Fig. 1 is a circuit diagram of a conventional alternating operation relay device, Fig. 2 is a circuit diagram of an alternating operation relay device according to an embodiment of the present invention, and Fig. 3 is a circuit diagram of another embodiment of the present invention. be. D...Alternating operation circuit section, m...Reversing circuit section, 4...External contact, 5c, 5d...Contact, 6,7...・Magnetic contactor. Figure 1 Figure 2 Figure 3

Claims (1)

[Claims] 1 an external contact, first and second load power supply electromagnetic contactors that supply power to their own windings in response to closing of the external contact, and the external contact and the first and second load power supply The first magnetic contactor that opens and closes in a complementary manner between the winding of the electromagnetic contactor
and an alternating operation circuit section in which the open/close states of the first and second contacts are reversed each time the external contact is opened, and a second contact is inserted and connected, and the first and second contacts are inverted when the external contact is closed. and a reversing circuit section that detects non-operation of both the second load power supply electromagnetic contactors and reverses opening and closing of the first and second contacts of the alternating operation circuit section.