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What are the reasons for the abnormal return of the camshaft of the computer spring machine?

Update:19 Aug 2019
Summary:

First, the position of the sensor switch is too close ( […]

First, the position of the sensor switch is too close (the distance is too close to be easily injured), causing the switch to be always bright;
Second, the position of the inductive switch is too far away (the distance is too far to affect the sensitivity), and the signal is not sensed;
Third, the sensor switch is faulty (quality problem), always bright or often not bright.
The solution adopted in the above situation: First, re-install the sensor switch, rotate the camshaft of the spring machine to the high position of the screw, then load the sensor switch, and then touch the screw position and then reverse the sensor switch by 2 wire ports. Yes; second, if the sensor switch is a quality problem, replace the beginning.