TECHNICAL SUPPORT
Published 2026-03-25
Have you ever encountered this rather helpless situation: after theservois installed, the center signal has been given, but it always tilts its head and cannot return to the center position no matter how you adjust it. Or during the operation of the equipment, theservosuddenly "deviates" on its own, and as the movement continues, the deviation becomes larger and larger, and the movements become more and more outrageous. When encountering this situation, don't rush to suspect that there is a problem with the hardware quality. In fact, this situation often occurs because the zero point position of theservois not set properly.
Today we are going to talk about how to use a more ingenious and smart method - automatically adjusting the zero position, so that the steering gear becomes "obedient" instantly.
The zero point of the steering gear is, to be precise, the position it considers to be in the "center". However, this so-called "exact middle" is very likely to be inconsistent with the actual middle position you expect due to deviations in the installation angle, inconsistent gear clearance, or wear and tear caused by long-term and frequent use. In this case, if a signal is forcibly given to the servo, the servo will continue to bear a strong force, and then it will either shake constantly or become extremely hot. Over time, its accuracy will naturally deteriorate. Therefore, in order to solve this problem, we must start from calibrating its "self-awareness".
When we performed zero adjustment operations in the past, did we need to connect to the computer, then open the debugging software, and then change the PWM pulse width value bit by bit? Completing the entire series of operations not only consumes a lot of time, but also requires staring at the values for a long time. After the adjustment is completed, the power must be turned on again for testing. If you encounter mass production or on-site debugging, and you have to operate each one manually, the efficiency will be so low that it can make people collapse. And relying solely on the naked eye and experience to judge, the feel of different people is different, and it is difficult to ensure that it can be accurately adjusted to the same standard every time.
In addition, in actual operation, this method still has many inconveniences. For example, in mass production, a large number of equipment need to be adjusted to zero points. Manual adjustment one by one is not only inefficient, but also prone to human errors. During on-site debugging, time is tight, and this tedious manual operation method will seriously affect the work progress. Moreover, because different people have different sensitivities to numerical values and operating habits, even if they rely on experience and naked eye judgment, it is difficult for the final debugging results to reach a highly consistent standard, which will have a certain impact on the quality control and performance stability of the product.
The process of automatic adjustment is much simpler. It is like installing a special "self-test program" for the servo. When you just give it a start command, the servo will start working mode on its own. It will actively search for two mechanical limit points, and then accurately calculate the intermediate value between the two limits based on the internally set algorithm, and then default that position as the new zero point. The entire operation process is fully automated. You do not need to hold a screwdriver and use software to make fine adjustments. It only needs a signal and it can complete the relevant work satisfactorily.
In the subsequent operation process, as long as the equipment is in a normal state, the servo will continue to work stably based on this newly set zero point. It will monitor its own operating conditions at all times, and if there is a deviation, it will correct itself based on the previously calculated algorithm. No matter how the external environment changes, it can always maintain accurate operation with its own automatic adjustment function, providing a strong guarantee for the stable operation of the entire system.
The first step is to ensure that the servo is in an unloaded state. The specific operation is to remove the connected mechanical arm or transmission mechanism.
The second step is to send a specific calibration signal to the servo, such as long pressing a button or sending a specific pulse three consecutive times through the controller.
The third step is to wait for a few seconds. At this time, the servo will rotate left and right twice and finally stop at the calculated zero position. At this time, the calibration has been completed and the load can be reinstalled and it can be used normally.
The biggest benefit is peace of mind. Whether it is a servo that has just left the factory or an old servo that has been used for a long time, it can be restored to a precise state within a few seconds. In this way, the consistency of your equipment is guaranteed, and you no longer have to worry about having to readjust all the movements if you change the servo. More importantly, it greatly lowers our debugging threshold. There is no need to understand complex PWM knowledge. Even a novice can get it done by pressing a few buttons.
So next time when you are faced with selecting or evaluating a servo solution again, you might as well ask one more question: Does it support the automatic zero-point adjustment function? Some servos appear to have very beautiful parameters on the surface, but in fact they still use the old-fashioned manual potentiometer calibration method, which is particularly troublesome in actual use.
Those servos that support automatic adjustment usually integrate more advanced magnetic encoders and control algorithms, which not only means that the zeroing operation becomes simple and easy, but also shows that their stability and durability will be superior.
In actual projects, have you ever encountered "metaphysical" problems caused by the inaccurate zero point of the steering gear? Welcome to share your experience in the comment area, and let's discuss solutions together.
Update Time：2026-03-25
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