JPS5471401A - A device to control the number of pumps in operation - Google Patents

A device to control the number of pumps in operation

Info

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
Application number
JP13906777A
Other languages
Japanese (ja)
Inventor
Yasuhiro Nakajima
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Mitsubishi Electric Corp
Original Assignee
Mitsubishi Electric Corp
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Mitsubishi Electric Corp filed Critical Mitsubishi Electric Corp
Priority to JP13906777A priority Critical patent/JPS5471401A/en
Publication of JPS5471401A publication Critical patent/JPS5471401A/en
Pending legal-status Critical Current

Links

Landscapes

  • Control Of Positive-Displacement Pumps (AREA)
  • Feedback Control In General (AREA)
  • Control Of Non-Electrical Variables (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
JP13906777A 1977-11-18 1977-11-18 A device to control the number of pumps in operation Pending JPS5471401A (en)

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)

* Cited by examiner, † Cited by third party
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

Cited By (2)

* Cited by examiner, † Cited by third party
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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