**Q&A on Common Technical Problems of AI Industrial Regulators**
This document provides answers to frequently encountered technical issues related to AI industrial regulators. Whether you are a technician, engineer, or operator, this guide can help you troubleshoot and resolve common problems efficiently.
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**1. How to identify the model of a Yudian instrument?**
Answer: The model number and installed module type of the Yudian AI series instruments are usually marked on the side label of the housing. You can determine the main unit model and the installed module based on the dot mark. However, if the instrument was not shipped directly from the manufacturer, it may have been modified by an agent or third-party supplier, which could affect the markings. Additionally, when the meter is powered on, it displays part of the main model number and the internal software version. Opening the case allows you to view the modules installed. You can also contact U-Tech’s support team using the serial number to confirm the model.
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**2. The instrument displays “OrAL†and the reading is inaccurate.**
Answer: The “OrAL†message indicates that the input signal exceeds the meter's range. First, check if the sensor is damaged, verify the wiring connections, ensure that the input type (SN or INP parameter) matches the sensor, and confirm that the input range setting aligns with the sensor’s specifications. Also, check if the translation correction parameter SC is set correctly. If these steps don’t resolve the issue, consider recalibrating the sensor or consulting the manual for further guidance.
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**3. Cannot modify SV or enter program settings.**
Answer: To modify SV or access program settings, the parameter lock (LOC) must be set to 0. The EP parameter defines the field common parameters. Setting LOC to 808 allows full parameter modification, but it should be reset to 0 after changes to prevent accidental adjustments. This helps avoid unintended modifications to critical internal settings.
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**4. No output signal and the instrument is not working.**
Answer: Check the output wiring connections, control mode, output mode, and upper/lower limit settings. Ensure the SV/block value is correctly configured, and confirm that the program table has an active running program. Verify that the output module is properly installed and that the alarm external shutdown feature is not enabled. If all settings appear correct, consider checking the power supply or contacting technical support.
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**5. Relay output is too frequent.**
Answer: Increase the output cycle parameter (CTI). A typical setting for relays ranges from 15 to 60 seconds. This helps extend relay life while maintaining control accuracy. For better performance and longevity, it is recommended to use thyristor or solid-state relays instead of mechanical ones.
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**6. PV display value is fluctuating.**
Answer: Ensure that shielded cables are used for sensor input. In low-interference environments, unshielded cables may be acceptable for short distances. Check the sensor’s operation and consider replacing it if necessary. Some thermocouples may have poor internal insulation, causing the negative wire to touch the casing. Avoid using such thermocouples in multi-channel setups. If high-temperature insulation fails, it can cause measurement instability and safety risks. Adjusting the meter’s filter parameters can help reduce fluctuations if the measurement speed is not critical.
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**7. Alarm symbol flashes, but no output signal.**
Answer: Check if the alarm parameter (ALP) is set correctly and whether an alarm module is installed. If the alarm is triggered but no output occurs, verify the configuration and ensure the alarm function is properly activated.
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**8. Control is unstable.**
Answer: Before using a new system, perform a self-tuning process. The instrument has adaptive learning capabilities, and it may take several minutes to hours to reach optimal performance. If the control still shows deviation, check the self-tuning conditions and adjust them as needed. In some cases, manually adjusting PID or MPT parameters may be required. For similar systems, you can use previously known correct parameters without repeating auto-tuning.
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**9. Heating and cooling options, dual output settings.**
Answer: Heating and cooling functions can be enabled by modifying the CF (V7.0) or ACT (V8.0) parameters. Dual output functionality is controlled through the OPL parameter settings.
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**10. Power failure mode, preparation function, and measurement start settings.**
Answer: These settings are controlled via the RUN (V7.0) and PAF/PONP (V8.0) parameters. Ensure that the deviation alarm limits are properly set to activate the preparation function effectively.
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**11. When PV is higher than SV, the instrument still outputs.**
Answer: The instrument uses a PID control algorithm, which includes proportional, integral, and derivative actions. Even if PV is higher than SV, the differential and integral components may still cause output. The system may be trying to prevent a rapid drop in PV. If the error persists, check the PID or MPT parameters and consider recalibrating. Incorrect settings for the reaction direction (CF or ACT parameter) or an output lower limit (OPL) not set to 0 can also cause unexpected output when PV exceeds SV.
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This guide aims to assist users in understanding and resolving common issues with AI industrial regulators. Always refer to the official user manual for detailed instructions and consult technical support if problems persist.
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