JP2521266B2 - Pump drive - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a pump drive device that automatically operates three or more ombs alternately.

[Background Art] Conventionally, a pump device used in a building sanitary facility is
Two pumps were installed in one tank, and switching operation was performed alternately according to the pump drive signal. This has the advantage of extending the pump life per unit at the same time as having a backup in case of a failure, and being able to operate two units in parallel when the amount of water increases due to heavy rain, etc. The ratio to the load is much larger than 1: 2, and in recent years, the method of performing automatic alternating operation with three pumps has increased so that a spare pump can be used even if the pump fails during heavy load. I am doing it.

However, it is difficult for a conventional sequence circuit to cope with the power control board by this method, and it is usually handled by incorporating a sequencer in the relay control circuit, but the cost rises drastically and a failure occurs. There is a drawback in that it is not easy to make a configuration that can automatically cope with the situation.

[Object of the Invention] The present invention has been made in view of the above problems, and an object of the present invention is to enable automatic alternating operation of three or more pumps without using a sequencer, resulting in a failure. It is an object of the present invention to provide a pump drive device with an extremely simple structure that can automatically operate with the remaining pumps even when it occurs.

[Disclosure of Invention]

In the pump drive device of the present invention, a sequential control circuit that sequentially operates each motor control relay of three or more pump drive motors each time a pump drive signal is input, and a pump control signal that is set by the input of the pump drive signal. Equipped with a start confirmation timer that is output from the pump drive motor during motor operation. If the start confirmation timer is not reset after being set, a sequential command is issued to the control circuit when the time is up, and the pumps are sequentially controlled. In a pump drive device configured to operate a circuit, the sequential control circuit, a pump drive relay contact turned on by input of a pump drive signal,
Power is supplied via the normally closed contact of the momentary operation relay that immediately returns to the original state after being turned off by the time-out output of the start confirmation timer, and the momentary operation relay is connected to the load side of the pump drive relay contact. A second normally closed contact and a series circuit of a normally closed contact of the start confirmation relay of each motor that is turned off when a start confirmation signal of each motor is input and a start confirmation timer, and the time of the start confirmation timer. Since the normally open contact of the start confirmation timer that is turned on by the up output and the series circuit of the above instantaneous operation relay are connected in parallel, when the start confirmation signal is returned from the motors that are switched and operated sequentially, each motor One of the normally-closed contacts of the startup confirmation relay of is turned off, the startup confirmation timer is reset, and each motor control of three or more pump driving motors is sequentially controlled by the control circuit. The use relays are sequentially operated can always be operated a single motor for the pump drive. Also, when the start confirmation signal does not return from the motors that are switched and operated sequentially, all the normally closed contacts of the start confirmation relay of each motor remain on, the start confirmation timer is not reset, and the start confirmation timer is not reset. The time-out output of the timer turns on the normally-closed contact of the start-up confirmation timer to activate the instantaneous operation relay, and the normally-closed contact of the instantaneous operation relay turns off, so that power is not sequentially supplied to the control circuit. The second normally open contact of the operation relay is turned off and the start confirmation timer is reset, and at the same time, the normally open contact of the start confirmation timer returns to the original state, and the normally closed contact of the instantaneous operation relay and the second The normally open contact of the device returns to its original state, and power is supplied to the sequential control circuit again, and the sequential control circuit can be switched to perform the interlaced operation excluding the faulty pump. That.

〔Example〕

FIG. 1 shows an embodiment of the device of the present invention.
As shown in the figure (a), by using the alternate relays A ₁ , A ₂ , and A ₃ whose two contacts are alternately switched every time the pump drive signal is turned off,
The first alternating relay A ₁ and its switching contact a ₁ are connected in parallel, and the switching contacts a ₂ , a ₃ are connected to the second and third alternating relays A ₂ , A ₃ respectively connected to this switching contact a _1. Connect in parallel, second
To the switching contact a ₂ of the first and third motor control relays X ₁ , X ₃
Is connected to one of the _third switching contacts a ₃ with a second motor control relay X ₂ to form a sequential control circuit S. The sequential control circuit S has a pump which is turned on by a pump drive signal. Power is supplied via the drive relay contact y and the normally-closed contact z ₁ of the instantaneous operation relay Z that operates momentarily with the output of the start confirmation timer T ₁ , and the pump drive relay contact y operates instantaneously on the load side. Start confirmation of the second normally closed contact z ₂ of the relay Z, the start confirmation of each motor M, the normally closed contacts m ₁ , m ₂ and m _{3 of the} relay MC and the start confirmation timer T ₁ (1 second), and the start confirmation For timer T ₁
The output contact t ₁ and the series circuit of the instantaneous operation relay Z are connected in parallel.

A normal relay Z is used as the instantaneous operation relay Z,
A second timer T ₂ (1 second) is connected in parallel to this,
Insert the output contact t ₂ of the second timer T ₂ in series with the relay Z, and further connect the normally open contact z ₃ of the relay Z to the start confirmation timer contact.
Relay Z is connected to the second timer by connecting in parallel to t _1.
This is the one in which the instantaneous operation was performed until 1 second after the operation of T ₂ . That is, the normally open contact t ₁ is turned on by the time-up output of the start confirmation timer T ₁ . This makes the second
When the timer T _{2 of} is set and the relay Z operates,
The normally closed contacts z ₁ and z ₂ are turned off and the normally open contact z ₃ is turned on. At this time, the normally open contact t is turned off by the operation of the normally closed contact z ₂ , but the relay Z is self-held by the contact z ₃ .

Then, the second normally closed contact t ₂ by time-up output of the timer T ₂ is turned off after one second, the relay Z is no longer energized, the contacts z _1, z _2, z ₃ is the return to the original state . Again 3
If all the motors M of the stand are out of order or the setting switches Sw shown in FIG. 3B are both set to “OFF”, the timers T ₁ and T ₂ will be repeatedly turned on and off forever. , To stop the operation after a certain time, connect a _third timer T ₃ (20 seconds) in parallel to the load side of the pump drive relay contact y, and connect its output contact t ₃ in series with the start confirmation timer T ₁ . Have been inserted into. That is, if at least one pump driving motor M is operating, the pump driving motor M is stopped in less than 20 seconds and the pump driving relay contact y
Is turned off and the third timer T ₃ is reset. Further, when the setting and when the motor M for driving all pumps failed switch SW is set to either "Off" is by resetting the restart confirmation timer T _1, start confirmation timer T ₁ It also prevents the on / off fluttering of the second timer T ₂ .

Further, the start confirmation relay MC is configured as an auxiliary contact of the electromagnetic contactor MC which is controlled by the motor control relay contacts x ₁ , x ₂ , x ₃ and directly turns the motor M on and off, as shown in FIG. When a failure occurs, the power supply is shut off by the contact h of the thermal relay TH connected in series to the motor M, so that the start confirmation operation is not performed. In the figure (b), L ₁ , L ₂ and L ₃
Are an operation indicator light, a stop indicator light and a trouble indicator light, respectively.

Next, the operation of FIG. First, all motors M
Is normal, the pump drive relay contact y is turned on by an external signal from the water level sensor, which causes contact a ₁
And a first motor control relay X ₁ is energized through a _2, the waste water is performed by the first motor. When the drainage is completed, the pump drive relay contact y is turned off by the signal from the water level sensor, so the alternate relays A ₁ and A ₂ are turned off, and at the same time the contacts ₁ and a ₂ are reversed. Therefore, when the pump drive signal is input next and the pump drive relay y is turned on, the second motor control relay X ₂ is energized, drainage is performed by the second motor, and when the pump drive signal is turned off, this time. Switches the contacts of alternate relays A ₁ and A ₃ . In this way, the first, second, and third motors are sequentially driven, and then the contact a ₃ at the right end in the figure is reversed to determine which of the motor control relays X ₁ , X
_{When 2} and X ₃ are no longer energized, the start confirmation relay contacts m ₁ and m
Neither ₂ nor m ₃ operate, so that the activation confirmation timer T ₁ operates after 1 second has elapsed. That is, pump drive relay y
Is on (pump drive signal is on) and start confirmation relay contacts m ₁ , m ₂ , m ₃ are on (start confirmation signal is on), that is, all logical product inputs are on (“H”) Then, the output is turned on (“H”) and the activation confirmation timer T ₁ is set. When the start-up confirmation timer T ₁ operates, the contact t ₁ is closed, the momentary operation relay Z is operated and the normally-closed contacts z ₁ and z ₂ are momentarily turned off, and thereby the alternate relay contacts a ₁ and a ₃ are reversed. Let the first motor control relay X
By energizing the ₁ activates the first motor. In this way, the three motors are sequentially operated. When the pump drive relay y is turned off or any of the start confirmation relay contacts m ₁ , m ₁ , m ₃ is turned on, the start confirmation timer T ₁ is de-energized, so the start confirmation timer T ₁ is reset. To be done.

If any pump unit fails,
When the sequential control circuit S is switched and the unit in failure is supplied with power, the start confirmation signal is not returned to any of the start confirmation relay contacts m ₁ , m ₂ , m ₃ , so the start confirmation timer T ₁
Is not reset, and therefore, after one second, the instantaneously actuated relay contact z ₁ is turned off to issue an internal signal for sequentially operating the control circuit S, whereby control is switched to the next motor.

At this time, if the next unit also has a failure, the start confirmation timer T ₁ that has been set again by the _second normally closed contact z ₂ of the instantaneous operation relay Z and has started the time limit,
Again each of the starting check relay contacts m _1, m _2, m ₃ is also not reset by, thus further instantaneous operating relay Z in 1 second
Is operated to sequentially operate the control circuit S. In this way, the automatic alternate operation is continued as long as one normal unit remains.

The above circuit can be realized by using a logic circuit. FIG. 2 shows an example thereof.
In FIG. 7A, the sequential control circuit S is composed of three D flip-flops (product name 4013), and sequentially switches the output to Q _{1 to} Q ₃ at the rising edge of the clock pulse. The pump drive signal is supplied from the pump drive relay contact y through the chattering removal circuit 1, the inverter 2, and the OR circuit 3 to the control circuit S at the time of its fall, and at the same time, the pump drive signal and each output of the sequential control circuit S are output. Q _1, Q _2, Q ₃ and an aND circuit 4a, 4b, by entering into 4c, (b) on the rising edge of the hatched portion or the next pump drive signal after the output switching of the diagram, the motor control relay X ₁ , X
₂ and X ₃ are energized.

In addition, the startup confirmation circuit 5 uses the startup confirmation relay contacts m ₁ , m ₂ ,
The output of m ₃ is input to the NOR circuit 6 via the chattering prevention circuit. When one of the contacts m ₁ , m ₂ , m ₃ operates, the NOR output becomes L level and the resistor R ₁ and the capacitor are connected. C ₁
Charging of the capacitor C ₁ is performed when the output of the start confirmation circuit 4 does not fall to the L level even if the pump drive signal is turned on, although the charging of the start confirmation timer T ₁ formed by and is stopped. And the output of timer T ₁ goes high after a certain time.
The signal is inverted to the level and the differentiating circuit 7 and the integrating circuit 8 are operated.

The differentiating circuit 7 immediately outputs one pulse to cause the control circuit S to sequentially perform the switching operation, and when the start confirmation signal is still not returned, the output of the integrating circuit 8 is H level.
The control circuit S is driven again after being inverted to the level, but when the activation confirmation signal is returned by one pulse from the differentiating circuit 7, the output of the timer T ₁ becomes L level and the integrating circuit 8
Is designed to stop charging. Reference numeral 9 is a DC power supply circuit, 10 is a pilot lamp, and 11a, 11b and 11c are relay operation display lamps.

〔The invention's effect〕

The pump drive device of the present invention is set by a sequential control circuit that sequentially operates each motor control relay of three or more pump drive motors each time a pump drive signal is input, and is set by inputting a pump drive signal. Equipped with a start confirmation timer that is output from the pump drive motor during motor operation. If the start confirmation timer is not reset after being set, a sequential command is issued to the control circuit when the time is up, and the pumps are sequentially controlled. In a pump drive device configured to operate a circuit, a pump drive relay contact that is turned on when a pump drive signal is input to the sequential control circuit, and is turned off by a time-up output of a start-up confirmation timer, and then immediately returns to the original state. Power is supplied via the normally-closed contact of the instantaneous operation relay, and instantaneous operation is performed on the load side of the pump drive relay contact. Relay normally closed contact and a series circuit of a start confirmation timer of each motor start confirmation relay that is turned off when a start confirmation signal of each motor is input, and the start confirmation timer Since the normally open contact of the start confirmation timer that is turned on by the time-up output and the series circuit of the instantaneous operation relay are connected in parallel, when the start confirmation signal is returned from the motor that is sequentially switched and operated, One of the normally closed contacts of the start confirmation relay of each motor is turned off, the start confirmation timer is reset,
The sequential control circuit allows the motor control relays of three or more pump driving motors to be operated sequentially, so that one pump driving motor can always be operated. Also, when the start confirmation signal does not return from the motors that are switched and operated sequentially, all the normally closed contacts of the start confirmation relay of each motor remain on, the start confirmation timer is not reset, and the start confirmation timer is not reset. The time-out output of the timer turns on the normally-closed contact of the start-up confirmation timer to activate the instantaneous operation relay, and the normally-closed contact of the instantaneous operation relay turns off, so that power is not sequentially supplied to the control circuit. The second normally open contact of the operation relay is turned off and the start confirmation timer is reset, and at the same time, the normally open contact of the start confirmation timer returns to the original state, and the normally closed contact of the instantaneous operation relay and the second The normally open contact of the device returns to its original state, and power is supplied to the sequential control circuit again, and the sequential control circuit can be switched to perform the interlaced operation excluding the faulty pump. That. Therefore, even if the number of pumps is increased, it will be possible to handle with a circuit that simply increases the number of start confirmation relay contacts, and even if the number of pumps increases, the circuit configuration of the jump control circuit does not become complicated. There is an advantage that a simple circuit can be formed.

[Brief description of drawings]

1 (a) and (b) are circuit diagrams showing an embodiment of the device of the present invention, FIG. 2 (a) are circuit diagrams showing an application example of the same, and (b).
Is a timing chart showing the same operation. A ₁ , A ₂ , A ₃ ...... Alternating relay, X ₁ , X ₂ , X ₃ ...... Motor control relay, Z ...... Instantaneous operation relay, T ₁ ...... Startup confirmation timer, T ₂ , T ₃ ... … Timer, MC …… Start confirmation relay, a ₁ , a ₂ , a
₃ …… Alternate relay contacts, x ₁ , x ₂ , x ₃ …… Motor control relay contacts, y …… Pump drive relay contacts, z ₁ , z ₂ , z ₃ …… Instantaneous operation relay contacts, t ₁ …… Start confirmation timer contact, t ₂ , t
₃ ... Timer contact, S ... Sequential control circuit, M ... Motor.

Claims (2)

(57) [Claims] 1. A sequential control circuit for sequentially operating each motor control relay of three or more pump drive motors every time a pump drive signal is input, and a pump control signal set and a pump for each pump drive. Equipped with a start confirmation timer that is output from the motor during motor operation.If the start confirmation timer is not reset after being set, a sequential pump switching command is given to the sequential control circuit when the time is up, and the sequential control circuit operates In a pump drive device, which is made up of at least one, a pump drive relay contact that is turned on when a pump drive signal is input to the sequential control circuit, and an instant operation that immediately returns to the original state after being turned off by the time-up output of the start confirmation timer. Power is supplied via the normally closed contact of the relay, and the second side of the instantaneous operation relay is connected to the load side of the pump drive relay contact. Turns on by the series circuit of the normally closed contact of the start confirmation relay of each motor and the start confirmation timer that are turned off when the close contact and the start confirmation signal of each motor are input, and the time-up output of the start confirmation timer A pump drive device in which a normally-open contact of an operating start confirmation timer and a series circuit of the instantaneous operation relay are connected in parallel. 2. A first alternating relay and its switching contact are connected in parallel by using an alternating relay in which two contacts are alternately switched every time the pump drive signal is turned off, and a second relay is connected to each of the switching contacts. Each switching contact is connected in parallel to the third alternate relay, the first and third motor control relays are connected to the second switching contact, and the second motor control relay is connected to one of the third switching contacts. The pump drive device according to claim 1, wherein the pump drive device is formed by connecting and sequentially configuring a control circuit.