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Question: For angle travel valve positioners, the positioner’s feedback signal remains unchanged, preventing initialization. When manually adjusting the opening of the valve, the P opening value remains unchanged. But the valve moves. Answer: The diagnosis was that the feedback connection was not proper; the issue was resolved after retightening the screw for position feedback. Problem: Straight-stroke valve actuator, double-acting. The valve positioner cannot be initialized; the first step cannot be completed. Answer: An error in the gas line connection was found; the intake gas was connected to the outlet of the locator. After the correction, initialization works properly. Works normally. Question: Angular travel, double-acting actuator – initialization is normal, but it operates only within an angle of 45 degrees. In other words, a rotation within 0–45 degrees corresponds to 0–100%, while a rotation within 45–90 degrees also corresponds to 0–100%. Answer: Some parameters of the locator have been modified. Enter parameter P55 to restore factory settings. Reinitializing resolved the issue. Question: 1. How does the position feedback module output signals? 2. Is the output signal of the position feedback module 3.8mA, without changing with the input signal? 3. Is there no output signal for position feedback? Answer: 1. Connect a 24VDC power supply in series in the circuit to provide output. 2. The connection between the position feedback module and the motherboard is not secure enough ； The polarity of the 3.24VDC power supply is reversed, and there is a poor connection; in other words, the cable of the feedback module is not connected to the motherboard or not connected properly. Problem: The locator emits popping sounds from time to time, causing vibration in the valve. Answer: This is caused by air leakage in the gas circuit. Detect the outlet circuit of the locator and the position of the grinder head of the actuator. Use soapy water to detect the leak location, thereby enabling sealing. Problem solving: If the following error message appears during the automatic initialization process in step 2, the solution is to adjust the black pulley in question, fine-tuning it horizontally until the LCD screen shows a P opening value within the range of 6 to 9. If the same error message appears during step 2 of the automatic initialization process, the adjustment procedure is to adjust the black pulley as mentioned above, fine-tuning it horizontally until the appropriate value is displayed on the LCD screen. If an error occurs during step 3 of the automatic initialization process, the adjustment method is to use hex screws or star-shaped screws to adjust the relevant position. There are two double-acting positioners. However, it is not recommended to adjust this displacement. Do not adjust during normal use