JPS5471401A - A device to control the number of pumps in operation - Google Patents
A device to control the number of pumps in operationInfo
- Publication number
- JPS5471401A JPS5471401A JP13906777A JP13906777A JPS5471401A JP S5471401 A JPS5471401 A JP S5471401A JP 13906777 A JP13906777 A JP 13906777A JP 13906777 A JP13906777 A JP 13906777A JP S5471401 A JPS5471401 A JP S5471401A
- Authority
- JP
- Japan
- Prior art keywords
- pump
- liquid level
- storage tank
- pumps
- closed
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Landscapes
- Control Of Non-Electrical Variables (AREA)
- Control Of Positive-Displacement Pumps (AREA)
- Feedback Control In General (AREA)
Abstract
PURPOSE: To provide a device which detects the fall of the liquid level of a storage tank, and which, when the liquid level falls below the specified value, automatically increases the number of pumps in operation as required and thereby quickly restores the liquid level of the storage tank to the specified level at the time of emergency restoration.
CONSTITUTION: Suppose that electric power failed during the operation of pumps 2aW2e and that the liquid level of storage tank abnormally fell below the specified value. When power supply in recovered under this condition it becomes possible to control pumps 2aW2e, liquid level setting circuit 13 produces an output and closes contact points 32W35. Then, start switch 21 is closed and the first pump, say, pump 2a, starts operation. Then, after a fixed time, contact point 42 is closed. As a result, the second pump say, pump 2b, starts operation, and if the liquid level of storage tank 5 remains below the specified value after a specified time following the operation of the second pump, the third pump starts operation as contact point 43 is closed.
COPYRIGHT: (C)1979,JPO&Japio
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP13906777A JPS5471401A (en) | 1977-11-18 | 1977-11-18 | A device to control the number of pumps in operation |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP13906777A JPS5471401A (en) | 1977-11-18 | 1977-11-18 | A device to control the number of pumps in operation |
Publications (1)
Publication Number | Publication Date |
---|---|
JPS5471401A true JPS5471401A (en) | 1979-06-08 |
Family
ID=15236714
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP13906777A Pending JPS5471401A (en) | 1977-11-18 | 1977-11-18 | A device to control the number of pumps in operation |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS5471401A (en) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS62243977A (en) * | 1986-04-16 | 1987-10-24 | Toshiba Corp | Control device for dirty rainwater pump |
US4877537A (en) * | 1987-10-14 | 1989-10-31 | Mizota Industrial Co., Ltd. | Pumping system for gates |
-
1977
- 1977-11-18 JP JP13906777A patent/JPS5471401A/en active Pending
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS62243977A (en) * | 1986-04-16 | 1987-10-24 | Toshiba Corp | Control device for dirty rainwater pump |
US4877537A (en) * | 1987-10-14 | 1989-10-31 | Mizota Industrial Co., Ltd. | Pumping system for gates |
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