**Q&A on Common Technical Problems of AI Industrial Regulators**
Below is a detailed guide addressing common technical issues encountered with AI industrial regulators, including troubleshooting steps and solutions to help users resolve problems efficiently.
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**1. How to Identify the Model of a Yudian Instrument?**
To determine the model of a Yudian AI series instrument, check the label on the side of the housing. It usually displays the instrument model and the installed module type. The model can be identified using the dot mark, although this may vary if the instrument was not directly supplied by the manufacturer. In such cases, it might have been provided by an agent or third-party supplier. Some modules may be self-installed without any markings. Additionally, when the meter is powered on, it often displays part of the main model number and the internal software version. Opening the case allows you to see the installed modules. You can also contact U-Tech support using the serial number to identify the exact model.
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**2. Why Does the Meter Display "OrAL" and Show Inaccurate Readings?**
The "OrAL" message indicates that the input signal exceeds the meter's range. To resolve this issue, check the following:
- Is the sensor damaged?
- Are the wiring connections correct?
- Is the input type (SN or INP parameter) correctly set to match the sensor?
- Is the input range configured properly?
- Are the translation correction parameters (SC) set accurately?
If these settings are incorrect, the meter will not provide accurate readings.
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**3. Can't Modify SV or Enter Program Settings?**
If you're unable to modify the SV or enter the program setting state, check the parameter lock setting. Set the LOC parameter to 0 to allow changes to the SV or program settings. Also, ensure that the EP parameter (field common parameters) is set correctly. Setting LOC to 808 allows full access to all parameters, but remember to reset it after modifications to prevent accidental changes to critical settings.
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**4. No Output Signal or the Instrument Isn’t Working?**
Check the following to troubleshoot:
- Is the output wiring correctly connected?
- Are the control mode and output mode set appropriately?
- Are the SV/block values set correctly?
- Is there an active program running in the program table?
- Is the output module installed correctly?
- Has the external shutdown feature been enabled?
If any of these are misconfigured, the instrument may fail to function as expected.
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**5. Relay Output Acts Too Frequently?**
If the relay is switching too often, increase the CTI (output cycle) parameter. A typical setting ranges from 15 to 60 seconds. This helps extend the relay’s lifespan while maintaining effective control. However, for better performance, consider using thyristor or solid-state relays instead of mechanical ones.
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**6. PV Display Shows Fluctuations?**
Fluctuating PV readings can be caused by several factors:
- Ensure that shielded cables are used for sensor inputs. Unshielded wires should only be used for short distances in low-interference environments.
- Verify that the sensor is functioning correctly.
- Some thermocouples may have poor internal insulation, causing the negative wire to touch the outer casing. Avoid using such thermocouples unless high-speed temperature sensing is required.
- If the system operates at high temperatures, insulation material leakage can cause measurement instability and safety risks.
- Adjust the meter’s filter parameters to reduce fluctuations if the measurement speed is not critical.
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**7. Alarm Symbol Flashes, But No Output Signal?**
If the alarm symbol appears and the alarm light is on, but no output is generated, check:
- Are the alarm parameter settings (ALP) correct?
- Is an alarm module installed?
Incorrect settings or missing modules can lead to false alarms without actual output.
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**8. Control Is Unstable?**
For unstable control, the instrument must be self-tuned before first use. It also has an adaptive learning function. After tuning, it may take tens of minutes to several hours to reach optimal performance. If deviations occur, the self-tuning conditions may need adjustment. In some cases, manual PID or MPT parameter adjustments may be necessary. For similar systems, you can use known correct PID or MPT values instead of repeating auto-tuning.
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**9. Heating/Cooling Options and Dual Output Settings?**
Heating and cooling options are controlled via the CF (V7.0) or ACT (V8.0) parameters. For dual output configurations, adjust the OPL parameter accordingly.
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**10. Power Failure Mode, Preparation Function, and Measurement Start Settings?**
These settings are controlled through the RUN (V7.0) and PAF/PONP (V8.0) parameters. Ensure that the deviation upper and lower limit alarm values are set correctly to activate the preparation function.
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**11. Why Is There Output When PV Exceeds SV in Heating Control?**
In heating control, even if PV is higher than SV, the instrument may still output due to the integral and differential actions in the PID algorithm. The proportional action turns off the output, but the integral and differential actions consider past trends and system behavior. If PV remains above SV, the error may not be corrected, indicating possible improper PID or MPT settings. Check the CF or ACT parameter for correct system response and ensure the OPL parameter is set to 0.
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