PROTECTIVE DEVICE FOR A CONTROLLING SYSTEM OF A SEWAGE PUMP
A protective device for a controlling system of a sewage pump has a protective unit to protect a start capacitor and to avoid the start capacitor from burnout when an overload is occurred by actuating power source or when a transient voltage is occurred by malfunction of a controlling circuit after actuating the sewage pump. Therefore, the start capacitor is certainly protected and significantly improved in lifespan. The characteristic of this invention is that the protective device comprises an analogic or digital electronic circuit with a cutter efficiency.
1. Field of the Invention
The present invention relates to a protective device for a controlling system of a sewage pump, and more particularly to an electronic-type protective device that controls pump operation and has a protective unit protecting a start capacitor in the controlling system to avoid the start capacitor from burnout.
2. Description of Related Art
As shown in
According to above description, the conventional sewage pump system still has some drawbacks in use.
SUMMARY OF THE INVENTIONA main objective of the present invention is to provide a protective device for a controlling system of a sewage pump, wherein the protective device protects a start capacitor from keeping discharge and burnout when a switch is abnormally suspended.
To achieve the foregoing objective, the protective device for a controlling system of a sewage pump with a start capacitor and a run capacitor, the protective device comprising a protective unit having an analogic or digital electronic circuit with a cutter function to provide a protective efficiency to avoid the start capacitor in the sewage pump from burnout.
By having the protective unit, the start capacitor is protected from burnout and thus has an extended lifespan.
Further benefits and advantages of the present invention will become apparent after a careful reading of the detailed description with appropriate reference to the accompanying drawings.
A protective device for a controlling system of a sewage pump in accordance with the present invention has a protective unit to protect a start capacitor and to avoid the start capacitor from burnout when an overload is occurred by actuating power source or when a transient voltage is occurred by malfunction of a controlling circuit after actuating the sewage pump. Therefore, the start capacitor is certainly protected and significantly improved in lifespan. The characteristic of this invention is that the protective device comprises an analogic or digital electronic circuit with a cutter function.
The protective device for a controlling system of a sewage pump is applied to an operation-controlling circuit system 6 to drive a sewage pump 5 as shown in
According to above description, the protective device for a controlling system of a sewage pump has the following advantage that:
The electronic-type protective unit has the cutter function that makes the terminals 3 and 4 to switch from the NC status to the NO status to isolate the start capacitor from power source and keep the start capacitor from charging and discharging operations. Thereby, the start capacitor is protected from burnout and breakdown during long-period operation.
Although this invention has been described in its preferred form with a certain degree of particularity, it is understood that the present invention of the preferred form has been made only by way of example and that numerous changes in the details of construction and the combination and arrangement of parts any be resorted to without departing from the spirit and scope of the invention.
Claims
1. A protective device for a controlling system of a sewage pump with a start capacitor and a run capacitor, the protective device comprising a protective unit having an analogic or digital electronic circuit with a cutter function providing a protective efficiency to avoid the start capacitor in the sewage pump from burnout.
2. The protective device as claimed in claim 1, wherein the protective unit further comprises:
- a first terminal served as a signal input end of a power source;
- a second terminal kept at NC status with the first terminal to control the start capacitor and the run capacitor;
- a third terminal controlling the start capacitor; and
- a fourth terminal kept at NO status with the third terminal to control the start capacitor and the run capacitor.
Type: Application
Filed: Mar 9, 2007
Publication Date: Sep 11, 2008
Inventor: Robert M. Keener (Ashland, OH)
Application Number: 11/684,384
International Classification: F04B 49/00 (20060101);