JPH02140480A - Alarm generating device - Google Patents

Abstract

PURPOSE:To aim at preventing operation errors with simple circuits by selecting the driving of a pump other than pumps applicable to lines corresponding to each pump in normal use as well as emitting an output signal in case the driving of the pump is applicable to an unusable costraint and the like. CONSTITUTION:In case there is a costraint in the using state of pumps such as to approve the parallel driving of two pumps against a line A but not to approve the use of three pumps, the output of an AND circuit 24 becomes '1' only when a No. 1 pump is selected and driven for the line A. The output from AND circuits 25-29 is also generated in the same way. In an AND circuit 33, three pumps are parallel driven against the line A, so that the output '1' of the three pumps is inputted. This case is applicable to the above mentioned costraint, the output '1' is inputted into an OR circuit 39, further inputted into an alarm 40 such as a lamp, a buzzer, or the like so as to generate an alarm. Accordingly, when a selection applicable to the costraint is made, the output of the OR circuit 39 becomes '1', so that the alarm from the alarm 40 is emitted.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention is applied to a general auxiliary equipment control panel for pumps, etc., and is an alarm generator that issues an alarm when there is an unnecessary operation command for a pump, etc. It is related to the device.

[Conventional technology]

Conventionally, the selection of operation commands for each pump relied solely on human judgment, or complete interlock control was performed by installing IJ Mitsutwitches to detect open/close positions on all valves that change the flow direction of the vibration line. was.

[Problem to be solved by the invention]

When operating by constantly switching pumps, it is desirable to change the flow direction of the line and install limit switches for detecting open/close positions on all pulp pumps for complete in-clock control. If only one device is used, switching operations are not performed frequently and rely solely on human judgment in many cases, making it easy for operational errors to occur. Furthermore, to completely prevent this, complete interlock control must be performed, which is expensive.

[Means to solve the problem]

In order to solve such problems, the present invention provides a system including a plurality of regular pumps, lines corresponding to the regular pumps, standby pumps, and valves for switching these pumps, in which the line of each regular pump is If the operation of a pump other than the permissible number of pumps is selected, and if the operation of a pump other than the corresponding pump is selected for the line corresponding to each regular pump, and the selected pump is operated. Provided is an alarm generating device characterized by comprising a circuit that outputs an output signal when the device falls under a constraint that makes it unusable, and an alarm device that issues an alarm based on the signal from the circuit. .

[Effect]

Because the present invention has such a configuration, when a pump other than the permissible number of pumps is selected for operation on the line corresponding to the regular pump, or when a pump other than the corresponding pump is operated on the line corresponding to each regular pump, If a selection is made and the selected pump is in a state where it cannot be operated, a signal is input to the alarm device and an alarm is issued, thereby preventing serious operational errors.

〔Example〕

An embodiment of the present invention will be described based on the drawings.

In Figure 1, the regular pumps are No. 1 and No. 3, and the No. 2 pump is the common standby pump.

This example shows the overall configuration when either line A or B is not used, and the number of pumps is the smallest that can be used, such as pump No. 1 for line B or pump No. 3 for line A. . Note that 4 and 10 are valves that control the flow of these pumps 1, 2, and 3.

FIG. 2 is a circuit diagram for determining whether selection is possible based on the operation signal of the pump motor corresponding to FIG. 1 and the signal of the aforementioned changeover switch.

In FIG. 1, there are the following constraints on the usage state of the pump.

(Ge) Parallel operation of two pumps for line A is permitted, but three pumps are not permitted.

(b) When pump No. 1 is used in line B,
It is not permitted to operate pump No. 3 and pump No. 3 for Line A.

(1) If No. 2 pump is used for Line A, selecting No. 1 pump for Line B is not permitted.

(If the country's No. 2 pump is used for Line B, selecting the No. 3 pump for Line A is not permitted.

Oj If the No. 3 pump is used for line B, it is not permitted to operate the No. 1 and No. 2 pumps for line B.

(Power) Parallel operation of three vehicles is not permitted for line B either.

FIG. 2 is a circuit configuration diagram for satisfying each of the above conditions, and 21, 22, and 23 are the operation signals of the respective pumps and the signals from the selection switches of lines A and B. 2
The output of the 4 AND circuit becomes "1" only when the No. 1 pump is selected for line A and is being operated (an operation signal is present). Outputs from 25 to 29 are generated using the same concept.

33 is operating in parallel to line AK, and outputs "1" from the three are input.

In this case, the above constraint condition item (a) is met, and the OR circuit 3
Output "1" is input to 9 and alarm 4 such as a lamp or buzzer
0 is input and an alarm is generated. The output of the OR circuit No. 31 is r2J when the No. 2 or No. 3 pump is operated with line A selected, and the AND circuit No. 34 has an output of r2J.
Since a signal that becomes "1" when the No. pump is operated for line B is also input, this corresponds to the above-mentioned constraint condition item (a).

Similarly, the combination of AND circuits 26 and 35 is a constraint condition item (one), and the AND circuits 27 and 36 are a constraint condition item (country,
The OR circuit 32 and the AND circuit 37 are constraint condition items (,t)
, AND circuit 38 correspond to each constraint condition item (force), and FIG. 2 satisfies all of the above-mentioned conditions. In this way, when a pump operation that satisfies constraints (A) to (force) is selected, the output of the OR circuit 39 is
1'', and the warning device 4o issues an alarm.

In this example, to simplify the explanation, the number of pumps is 2 for regular use and 1 for backup, but even if the number of pumps for regular use is 3 or more, the control logic can be constructed using the same concept. It is possible to do so.

〔Effect of the invention〕

According to the regular alarm generating device of the present invention described above, an alarm is issued when there is a constraint that prevents at least two or more pumps from operating in the same system at the same time.
A simpler circuit can prevent serious operational errors.

[Brief explanation of the drawing]

FIG. 1 is an overall configuration diagram to which an alarm generation device according to an embodiment of the present invention is applied, and FIG. 2 is a circuit diagram of the alarm generation device according to an embodiment of the invention. ■...Pump No.1, 2...Pump No.2, 3...Pump No.3, 11...Line A112...Line B121
・No. 1 pump operation signal and selection signal, 22... No. 2 pump operation signal and selection signal, 23., No. 3 pump operation signal and selection signal, 24-29. 33-38-A
ND circuit, 31.32.39/OR circuit, 40 alarm.

Claims (1)

[Claims] In a system equipped with multiple regular pumps, lines corresponding to the regular pumps, standby pumps, and valves that switch between these pumps, operation selection of pumps other than the allowable number of pumps in the line of each regular pump is possible. or when a pump other than the corresponding pump is selected for operation on the line corresponding to each regular pump, and the operation of the selected pump falls under a constraint that makes it unusable. An alarm generating device comprising: a circuit that issues an output signal; and an alarm device that issues an alarm based on the signal from the circuit.