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Analog input following processing circuit for variable-frequency governor

A frequency conversion governor and processing circuit technology, which is applied in the direction of electrical program control, program control in sequence/logic controllers, etc., can solve the error output of the frequency conversion governor, system collapse, and reduced anti-interference ability of a given signal, etc. problem, to solve the effect of interference

Inactive Publication Date: 2013-08-14
XIANGMEI LEADER MINING EQUIP
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  • Abstract
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Problems solved by technology

In industrial applications, because the distance between the upper computer and the frequency converter is usually very far, the length of the corresponding shielded cable connecting the upper computer and the frequency converter is also very long, so the anti-interference ability of the given signal is greatly reduced, and it is easy to Cause the wrong output of the frequency converter or even the collapse of the system due to the interference of the given signal

Method used

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  • Analog input following processing circuit for variable-frequency governor

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Embodiment Construction

[0009] The present invention and its specific implementations will be described in further detail below in conjunction with the accompanying drawings.

[0010] see Figure 1-2 , the present invention includes a photoelectric isolation circuit and a power supply circuit, characterized in that: one end of the photoelectric isolation circuit is connected to the host computer through a voltage and current selection circuit, and the other end is connected to the analog input terminal of the frequency converter through a differential amplifier circuit The power supply circuit is connected with the photoelectric isolation circuit and the differential amplifier circuit respectively.

[0011] AIN+ and AIN- are analog given signals (0-10V or 4-20mA) output by the host computer, and AIN+ and AIN- are connected to the host computer through shielded cables. When S1 is in the disconnected state, it accepts the voltage signal (0-10V) of the host computer; when S1 is in the closed state, it ...

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Abstract

The invention discloses an analog input following processing circuit for a variable-frequency governor. The analog input following processing circuit comprises a photoelectric isolation circuit and a power supply circuit, and is characterized in that one end of the photoelectric isolation circuit is connected with a host computer through a voltage and current magnitude selection circuit, and the other end is connected an analog input terminal of the variable-frequency governor through a differential amplifying circuit; and the power supply circuit is connected with the photoelectric isolation circuit and the differential amplifying circuit respectively. The analog input following processing circuit is mainly used for processing an input analog given signal of the variable-frequency governor.

Description

technical field [0001] The invention relates to an analog input following processing circuit, in particular to an analog input following processing circuit for a variable frequency speed regulator. Background technique [0002] There are usually two ways for the frequency converter to adjust the frequency output, one is the program setting method of the frequency converter itself, and the other is giving the analog value through the external terminal (0-10V voltage setting or 0- 20mA current given). The program setting method needs to directly control the man-machine interface of the frequency converter, and the operator needs to be on the side of the frequency converter all the time. Therefore, this method is generally used in the stand-alone debugging of the frequency converter, and is usually used in industrial applications. It is connected with the upper computer, and the output analog value of the upper computer is sent to the external terminal of the frequency conver...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G05B19/04
Inventor 贺风华贾胜郭浪高见崔会朋
Owner XIANGMEI LEADER MINING EQUIP
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