JPH0526174A - Pump device failure detecting method - Google Patents

Abstract

PURPOSE:To provide a pump device failure detecting method for detecting the failure of either one of plural pumps. CONSTITUTION:When either one of plural pumps 11, 12, start-stop controlled repeatedly in the specified order by an automatic operating device, is in failure, the integrated value of the counter 17 or 18 of the following pump to be operated after the pump in failure reaches the set value of more than 2 by adding the frequency of operation in the case of the following pump being operation- started without the counter 17 or 18 of the following pump being reset. This fact on the integrated value is detected, and a failure signal is sent our That is, in the case of either one of the pumps being in failure, the addition of 1 is left without the reset of the counter of the following pump to be operated after the pump in failure. In this state, if the concerned following pump is operation-started and the frequency of operation is added, the integrated value of the concerned counter reaches the set value of more than 2. The pump in failure is thereby informed.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for detecting a failure of a pump device, and more particularly to detecting it when one of a plurality of pumps that are repeatedly controlled to start and stop in a predetermined order becomes inoperable. The detection method.

[0002]

2. Description of the Related Art For example, in a pump device for drainage (or water supply), a plurality of pumps are used for drainage (or water supply) so that the water level in a water tank (or pressure tank) is within a desired range. In this case, a plurality of pumps are repeatedly controlled to start and stop in a predetermined order via an appropriate automatic control means.

However, for example, in a pump device for drainage of sewage, a plurality of pumps may be installed inside the sewage layer, which is a place where the observer cannot see.
The pump cannot be monitored.

[0004]

In such a case, even if one pump becomes inoperable due to a defective control system or the like,
Since the sewage is discharged by the operation of the other pump, there is a problem that the above-mentioned pump that has malfunctioned cannot be easily found.

The present invention has been made under such circumstances, and an object of the present invention is to reliably detect a failure of any one of a plurality of pumps and to improve reliability. It is intended to provide an excellent method of detecting a failure in a pump device.

[0006]

In order to achieve the above object, the present invention provides a plurality of pumps which are repeatedly controlled to start and stop by an automatic driving device in a predetermined order, and are provided corresponding to the respective pumps. When the pump is operating normally, the number of times of operation is integrated, and the counter that is reset according to the predetermined operation sequence when the pump is operating normally and the integrated value of the counter And a failure signal output means for sending a failure signal when a set value of 2 or more is reached, and if any of the pumps that are repeatedly controlled to start and stop in a predetermined order has a failure, the failure pump is output in a predetermined order. If the counter of the next pump to be operated does not reset and the next pump starts operating, the number of times of operation is added so that the integrated value of the counter of the pump is 2 or more. Characterized by being adapted to deliver a detection to a fault signal from reaching the set value.

[0007]

According to the failure detecting method of the present invention, when all the pumps are in normal operation, the integrated values of the counters of the pumps in the next operating order are sequentially reset. However, if any of the pumps fails, the counter of the pump operating next to the failed pump is not reset and the integrated value of 1 is still added. When the number of times of operation is added when the pump has started operation, the operation signal is added to the counter of this pump, so that the integrated value of the counter reaches a set value of 2 or more, thereby notifying the failed pump. You can

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below with reference to a first embodiment shown in FIGS.

In this embodiment, the case where the present invention is applied to a pump device in which two pumps are used to alternately start and stop control is shown.
A case where a signal related to the input current of the drive motor is used as the operation signal in this case will be described, but the present invention is not limited to this.

In the figure, 11 and 12 are the first, respectively.
And a second pump are shown, and the first and second pumps 11 and 12 are respectively the first and second driving electric motors 1.
The electric motors 13 and 14 are controlled to start and stop alternately by an appropriate automatic driving device (not shown) according to the water level and the like, and when one of them is in the operating region. The other is configured to be in the rest area.

The input circuit of each of the electric motors 13 and 14 is provided with an automatic reset type overload protection device (not shown) including an appropriate overload relay and electromagnetic circuit breaker, and a large current exceeding the allowable limit. It is configured so that the input can be cut off in the case of an overload condition such as high temperature or high temperature.

The operation signal related to the load current of the electric motors 13 and 14 is taken out through the current transformers 3 and 3, and the first and second signal processing circuits 15 and 16 (for example, rectification,
A / D conversion). First and second counters 17 and 18 are connected to the signal processing circuits 15 and 16, respectively. The first (second) signal processing circuit 15
(16) sends a count signal to the first (second) counter 17 (18) when a driving signal is detected, and sends a reset signal to the second (first) counter 18 (17) It is supposed to do. These counters 1
Nos. 7 and 18 send a failure signal when the integrated value reaches a set value of 2 or more. This failure signal is output by the output circuits 7 and 7 (for example, amplifier circuit, switch circuit,
Via a relay or the like, the display 8, the alarm device 9 such as a bell or a buzzer, and the electromagnetic circuit breaker control means 10 are guided to those provided as necessary.

According to the above configuration, the first (second)
Counter 17 (18) of the first (second) electric motor 13
When (14) is in the operating state, it is counted as "1", and then the first (second) electric motor 13 (14) enters the idle region and the second (first) electric motor 14 (13) is in the operating state. Will be reset. Therefore, these both electric motors 13, 1
If 4 is in normal alternate operation, counter 1
The integrated value of 7 and 18 does not exceed "1", and no failure signal is transmitted.

The second (first) electric motor 14 (13)
Even if the operation is stopped for some reason, for example, due to the operation of the automatic restoration type overload protection device, the overload protection device will be After returning, the electric motor 14 (1
When 3) becomes the operating state, the first (second) counter 17 (18) is reset again and the operation signal is sent to the second (first) counter 18 (17), so that the failure signal is output. It is never sent out.

However, for example, the second electric motor 14
If the operation signal is not detected (is not in the operation state) even though is in the operation area, the first counter 17 in the next operation order is not reset,
The integrated value remains "1", and the number of times of operation is added next time the first electric motor 13 enters the operating state, so the integrated value of the first counter 17 becomes "2".

Therefore, if the integrated value at which the failure signal should be sent is set to "2" in advance, the failure signal is sent from the first counter 17 so that there is an abnormality on the second electric motor 14 side. Can be detected.
That is, it is possible to reliably detect the electric motor that does not operate even though it is in the operation area at a remote place.

In the second embodiment shown in FIG. 3, a plurality of (four in the figure) electric motors are arranged in a predetermined order, for example N.
o. 1, No. Repeated start and stop control in the order of 2 ... 1
When the platform is in the operating area, the others are configured to be in the rest area. Then, the operation signal of each electric motor is given as a count signal to a counter that integrates the number of times of operation of the electric motor (for example, No. 1), and the next one electric motor (operating state after the electric motor) ( For example, it is adapted to be given as a reset signal to the counter for accumulating the number of operations of No. 2).
That is, it is substantially equivalent to the so-called rotary operation in which the alternate operation in the second embodiment is expanded. In other words, the first embodiment is also a special case of the second embodiment.

In the second embodiment, for example, N
o. If the electric motor of No. 1 is in the operating state, the No. "1" is counted in the counter of No. 1 and the No. No. 2 that accumulates the number of times the electric motor of No. 2 is operated. The 2 counter is reset. Therefore, if it is in a normal operating state, the same operation is performed thereafter, and the next counter is sequentially reset. Therefore, the integrated value of each counter does not exceed "1", and the failure signal is not transmitted.

However, for example, in No. If the electric motor of No. 1 remains stopped even when the next operation order comes,
Since the driving signal is not detected, No. The counter of No. 1 does not count "1", and No. In the 2 counter, the previously counted "1" remains unreset. Therefore, next No. When the electric motor of No. 2 is in operation, No. The integrated value in the counter of No. 2 is "2", and if the integrated value to send the failure signal is set to "2" in advance, No. No. 2 by the failure signal sent from the counter of No. 2 An abnormality on the electric motor side of No. 1 is detected. Also in this case, it is possible to detect a failure of the pump device installed in a remote place that is difficult to monitor, such as a dirty water layer. The present invention is not limited to the above-described embodiments, and various modifications and applications are possible within the scope of the gist of the invention.

[0020]

As described above, according to the present invention, when any one of a plurality of pumps fails, it can be detected reliably, and a pump device installed in a remote place which is difficult to monitor. It is possible to detect faults with excellent reliability by applying to.

[Brief description of drawings]

FIG. 1 is a block diagram showing a first embodiment of the present invention.

FIG. 2 is a flowchart of the same embodiment.

FIG. 3 is a flowchart showing a second embodiment of the present invention.

[Explanation of symbols]

11, 12 ... Pump, 13, 14 ... Electric motor, 15, 16
... signal processing circuit, 17, 18 ... counter, 7 ... output circuit, 8 ... indicator, 9 ... alarm device.

Claims (1)

Claim: What is claimed is: 1. A plurality of pumps, which are repeatedly controlled to start and stop by an automatic operation device in a predetermined order, and a plurality of pumps provided corresponding to each of the pumps. A counter that counts the number of times of operation and that is reset when the pump that operates before the pump in accordance with the predetermined operation sequence is in normal operation, and when the integrated value of the counter reaches a set value of 2 or more. If any of the pumps that are repeatedly controlled to start and stop in a predetermined order fails, the counter of the pump that operates next to the failed pump is not reset. When the next pump starts operating, it is detected that the integrated value of the counter of this pump reaches a set value of 2 or more by adding the number of times of operation. Fault detection method of the pump device being characterized in that so as to deliver a disabled signal.