This picture is the FUJI NXT second-generation equipment track exit entrance amplifier diagram (some of the NXT first-generation models have the old "Samtake" type, which seems to be HPX***, who knows that I can leave a message, the second-generation NXT I have contacted is FS -V33P, the third generation of NXT is FS-N13P), the yellow on the left is connected to the exit and entrance fibers respectively. It is a through-beam type. When a PCB passes through the through-beam section, the amount of incident light of the fiber (note that it is the amount of light, not the light) changes. The amplifier is calculated according to the pre-set parameters:

 

1. At the entrance position, determine whether there is a PCB passing through, and the IO will generate a signal accordingly. An error will affect the judgment of the device logic.

 

2. The entrance position, determine when the PCB end passes, and calculate the track stop. The inaccurate determination of the PCB end will affect the stop position, and eventually the mark point will not be recognized, and the equipment will not operate normally.

 

 

3. At the exit location, determine whether there is a PCB passing through. This is similar to the first point, IO will generate signals accordingly, and errors will affect the judgment of the device logic.

 

Let me talk about the frequently encountered problems:

 

1. When the optical fiber is aging, the NXT cannot correctly process the logic signal when the PCB passes by, causing the device to "scrape". The card is added with quotation marks, but it is not a real card. The track is not uneven, but the signal is not correct. If the motor malfunctions correctly, the PCB will not be able to reach the correct position in the end. At this time, you can first try to increase the power of the amplifier. This is to increase the amount of incoming light and indirectly compensate for the problem of fiber aging. But in the end, the optical fiber needs to be replaced. After all, the aging of optical fiber spare parts is a real problem.

 

2. When the amplifier is abnormal, the editor thinks that the abnormality should be divided into two types:

 

    The first type is hardware failure, such as damage to the amplifier's fiber optic components, aging of optical components, and room display after power-on. At this time, you have to directly replace the new amplifier and reset the parameters.

 

    The second type is software failure and abnormal amplifier parameters. This part of the design contains a lot of content, please refer to "NXT Orbit Amplifier Calibration", if you have other questions, you need to download the corresponding manual from the Keyence official website, and conduct detailed research and settings. Here are a few parameters to know how to adjust: Lon/Don mode, power/response time, initialization method, remote calibration mode...

 

3. When the mark points cannot be read due to uncertain factors such as amplifier/optical fiber/PCB/belt/transmission motor, etc., you can set the offset through NXT web accessory to compensate the left and right stop positions, as a technician or engineer It must be clear how to set this item. To say more, when there is a Pair mode for production, the offset values ​​of a pair of modules need to be consistent, otherwise the device will alarm (the specific information is not screenshots, and the alarm mechanism is not very clear, I suspected that it has something to do with the version of the machine) At this time, there is no other way to compromise the offset values ​​of the modules of the two pairs.