Power amplifier module detecting instrument
A technology of a power amplifier module and a detector, which is applied in the field of power amplifier module detection of railway diesel locomotives, can solve the problems of non-action of the electro-pneumatic valve, breakdown of the freewheeling tube, direct action of the electro-pneumatic valve, etc., and achieves high work efficiency, convenient operation, simple structure
Inactive Publication Date: 2015-05-20
CRRC LUOYANG CO LTD
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Problems solved by technology
During use, the power amplifier module mainly has the following faults: large pressure drop causes difficulty in starting the electropneumatic valve; breakdown short circuit causes the electropneumatic valve to act directly; open circuit causes the electropneumatic valve to not operate; breakdown of the freewheel tube causes difficulty in starting the electropneumatic valve
At present, there is no simple and effective detection method for the detection of power amplifier modules
Method used
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[0012] Such as figure 1 As shown, the 110V DC power supply is transformed into a 24V DC power supply through the power conversion module, and is controlled by a switch 1K. The output terminal of the 24V power supply module is connected to the GP input terminal of the power amplifier module as an input signal, and the output signal of the analog PLC enters the solid state relay in the power amplifier module GP. The input terminal of the power amplifier module GP is connected with a terminal display circuit composed of a resistor R and a light-emitting diode D in series. figure 1 It shows that 6 groups of output terminals are connected in series with a group of display circuits respectively, and a test switch 2K is connected to the output terminal of the 24V power supply module. The solid-state relay breaks down; when the test switch 2K is closed, manually input 24V voltage into the input terminal of the power amplifier module GP, and the light-emitting diode D at the terminal s...
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The invention provides a power amplifier module detecting instrument, and relates to a detecting instrument which is used for detecting whether a solid relay in a power amplifier module used in a PLC (programmable logic controller) of an internal combustion locomotive fails or not. The problems that a large number of power amplifier modules are used in the PLC of the internal combustion locomotive at present, and a simple and effective detecting method for detecting damaged power amplifier modules when the power amplifier modules are used does not exist are solved. A testing circuit of the power amplifier module detecting instrument includes that an outputting end of a 24V power module is connected with a display circuit through a power amplifier module GP; and an on-load testing circuit of the power amplifier module detecting instrument includes that an on-load relay coil which is controlled by a load switch 4K is connected between the outputting end of the 24V power module and an inputting end of the power amplifier module GP in parallel, and a normally open contact of an on-load relay is connected with the display circuit in parallel. The power amplifier module detecting instrument has main functions of equipment self-inspection, breakdown inspection, open circuit inspection and on-load voltage drop inspection. The power amplifier module detecting instrument has an overall detection function, a result is given at one step, an operation process is simplified, and waste on labor and materials is avoided.
Description
technical field [0001] The invention belongs to the technical field of detection of power amplifier modules of railway diesel locomotives, and in particular relates to a detector for detecting solid-state relays in power amplifier modules of programmable logic controllers of diesel locomotives. Background technique [0002] At present, a large number of programmable logic controller PLCs are installed in diesel locomotives. Due to the limitation of the load capacity of programmable logic controller PLCs, a large number of power amplifier module groups are used in PLCs. Two kinds of solid state relays with different load capacities and continuous Flow tube circuit, the two solid state relays are OMRON solid state relay model G3TB-0D20P (input 5V~24V, output 1.5A / 48V~200V) and Suzhou solid state relay model GZ5-W (input 12V~24V, Output is 5A / 110VDC). OMRON solid state relays are in groups of 6, and GZ5-W are in groups of 3. The freewheeling tube is composed of diode 1N5408. ...
Claims
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Inventor 谭地平徐敏
Owner CRRC LUOYANG CO LTD