YT Intelligent Positioner, Yongtai Korea
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The fault is manifested as a distorted screen (for example, the number 8 looks like a 5), and it’s not possible to enter the menu using the confirm button. When the valve position drops from %100 to 0, there is a period during which the percentage displayed does not decrease accordingly. After the valve is closed, 50% is displayed. It worked properly once connected to the signal generator.
Look for a model of the same type online and check the instructions.
Please reinstall the locator as required and then initialize it. Your problem is likely an installation issue.
Measure the current level; it can’t be step-controlled, right?