The reason of photoelectric sensor without output signal and the method of fault treatment

When the photoelectric sensor uses the detection object interval, many users always present the same problem that the photoelectric sensor does not output a signal after detecting the object, which makes it impossible to analyze the data. Everyone sees that no signal output will always make some fault judgments on the sensor, and some directly conclude that the sensor is bad, but it is not necessarily true. There are many reasons why the photoelectric sensor does not output after detecting the object. It is necessary to investigate step by step. The first thing that needs to be considered is the problem of wiring or equipment. Regarding the through-beam photoelectric sensor, it is necessary to use a combination of the light-emitting part and the light-receiving part, and both ends need power; while the diffuse reflection must be used by the sensor probe and the retro-reflective plate; the user must provide a stable power supply for the sensor, if it is DC Power supply, the positive and negative poles, and the wrong connection of the positive and negative poles will also cause the output signal to be absent.

The above is the thinking about the photoelectric sensor itself, and what needs to be considered is the orientation problem of the detection object. The detection object must be in the area that the sensor can detect, that is, the scale that the photoelectric can sense. Secondly, the optical axis of the sensor does not have a problem of alignment. The optical axis of the light-emitting part and the light-receiving part of the through-beam type must be aligned, and the optical axis of the corresponding retro-reflective probe part and the reflector must be aligned. The same thing is that the detection object does not meet the specifications of the standard detection object or the small detection object. The detection object cannot be smaller than the specification of the small detection object, so that the through-beam type and the reflection type cannot detect transparent objects well. The reflective type has requirements for the color of the detected object. The darker the color, the closer the detection interval.

Different testing environments will also cause certain impacts. The light intensity cannot exceed the extra scale. If there is dust in the on-site environment, it is necessary to regularly clean up the appearance of the photoelectric sensor probe. It may also be that multiple sensors are tightly installed and interfere with each other. There is also electrical interference that has a greater impact. If there are high-power equipment around, it is necessary to take corresponding anti-interference measures when the interference occurs. The above is attributed to the reasons for the investigation one by one. If these reasons are removed one by one and there is still no signal output, it is recommended to return to the manufacturer for inspection and judgment.