Q&A on common technical problems of Xiamen Yudian AI artificial intelligence industrial regulator
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Q&A on common technical problems of AI artificial intelligence industrial regulator
1. How to confirm the model of Yudian instrument?
Answer: The side label of Yudian AI series instrument housing has the instrument model and the installed module form. The model of the instrument host and the installed module can be determined according to the dot mark (but if the instrument is not shipped directly from the manufacturer, it may be by agent or accessory manufacturer). Install some modules by yourself, and there is no mark); in addition, when the meter is powered on, it can display the digital part of the instrument main model and the internal software version number; open the instrument case to view the module installed by the instrument; according to the machine number, you can also go to U-Tech. The department identified the instrument model.
2, the instrument flashes "OrAL", the meter display is not accurate
A: The symbol “OrAL†indicates that the input signal exceeds the meter range. Check whether the input sensor is damaged; whether the input wiring is correct; whether the meter input type (SN or INP parameter) setting matches the sensor; whether the meter input range setting is consistent with the sensor range ; The translation correction parameter SC setting is correct.
3. Instrument SV, internal parameters cannot be modified? The program table cannot enter the program setting state?
Answer: The parameter lock LOC parameter should be set to 0 to modify the SV or program, as well as the field common parameters defined by the EP parameters; the setting 808 can modify all parameters, but the LOC must not be retained at 808 after the parameters are modified, to avoid accidental operation and change internal importance. parameter.
4, the instrument has no output signal, does not work
Answer: Check whether the meter output wiring is correct; control mode, output mode, output upper and lower limit; whether the SV/block value is set correctly, whether the program table has running program; whether the instrument output module is installed correctly; whether the meter has set alarm external shutdown Features.
5, the relay output action is too frequent,
A: The output cycle parameter CTI can be increased. The general relay can be set between 15 and 60 seconds. It can balance the relay life and control effect, but it is recommended that the customer use thyristor or solid state relay for control.
6, PV display value fluctuations
A: To check whether the sensor input adopts shielded wire, only the short distance and no interference in the field can use the unshielded wire as input; check whether the sensor works normally; some thermocouples do not do well internal insulation, resulting in thermocouple negative and outer casing Collision, except for the use of leaky thermocouples that require very fast temperature sensing speeds, it is not recommended to use products with such thermocouples that are in contact with the outer casing. Such thermocouples cannot be used for multi-channel measurement common to the negative pole. And if the electric furnace insulation material leaks at high temperature, it will not only cause fluctuations in measured values ​​but also affect system safety. If the measurement speed is not high, the filter parameters of the meter can be set as necessary to appropriately reduce data fluctuations.
7. Is the instrument flashing alarm symbol and the alarm indicator light? The alarm light is on but there is no signal output?
A: Check if the alarm parameter setting value and ALP parameter are correct; if there is an alarm module installed.
8, the instrument control is unstable
A: The new watch must be self-tuned once before the new system is used. The instrument also has an adaptive self-learning function. After the tuning is completed, the instrument needs to work for tens of minutes to several hours to enter the optimal working state. If the control has deviation after setting Generally, the self-tuning conditions do not match. You can refer to the instructions on the manual to modify the self-tuning conditions. In special circumstances, you may need to manually modify the PID or MPT parameters. For the same system (for example, the same type of electric furnace), the characteristics are generally not much different. You can directly enter the known correct PID or MPT parameters without repeating the auto-tuning.
9, heating and cooling options, heating and cooling dual output settings
A: The heating and cooling options are implemented by modifying the CF (V7.0) / ACT (V8.0) parameters; the heating and cooling dual output is defined by modifying the OPL parameters.
10, program type instrument power failure mode selection, preparation function, measurement value start function setting
A: It is realized by setting RUN (V7.0) and PAF PONP (V8.0) parameters; the preparation function must set the deviation upper and lower limit alarm values ​​to be effective.
11. When the heating control instrument PV is larger than SV, there is output, which is not controlled.
Answer: The control algorithm of the instrument is composed of proportional, integral and differential (ie PID operation). When the PV is larger than SV, it only represents the proportional action part to turn off the output, but the differential action and integral action do not simply see whether the PV is greater than SV, differential Mainly look at the current trend, and the integral is the accumulation of past history, so even if the heating control PV is larger than SV, there may be an output, because the system thinks that this is the only way to avoid excessive PV drop. Of course, if the PV continues to be larger than SV, the error cannot be returned to zero. It may be that the PID or MPT control parameters are not set properly and need to be self-tuned or reset. In addition to the above reasons, setting the reaction to positive (system function CF parameter or ACT parameter) setting error, output lower limit OPL parameter setting is not 0 will also result in output when PV is greater than SV.
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