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(1) The indicator value of the temperature meter system suddenly changes to the maximum or minimum, which is generally a failure of the instrument system. Because the temperature meter system measures large lags, sudden changes do not occur. Most of the faults at this time are due to the thermocouple, thermal resistance, wire breakage in the compensation lead, or malfunction of the transmitter amplifier.
(2) Temperature control instrumentation system indicates rapid oscillation, which is mostly caused by improper adjustment of control parameter PID.
(3) The temperature control instrumentation system indicates the occurrence of large and slow fluctuations, which may be due to changes in process operations. If the process operation does not change at that time, it is likely that the instrument control system itself has failed.
(4) Failure analysis procedure of the temperature control system itself: Check whether the input signal of the regulating valve changes, the input signal does not change, the regulating valve is actuated, and the diaphragm of the valve diaphragm is leaked; check whether the input signal of the regulating valve positioner changes, and the input signal No change, the output signal changes, the positioner has a fault; check the positioner input signal changes, and then check the regulator output if there is no change, if the regulator input does not change, the output changes, this time is the fault of the regulator itself.
2. Pressure control instrument system failure analysis steps (1) pressure control system instrument indicates rapid oscillation fluctuations, first check whether the process operation changes, this change is mostly caused by the process operation and regulator PID parameter setting is not good.
(2) The pressure control system instrument indicates dead line, the process operation changes the pressure indication or does not change, the general failure occurs in the pressure measurement system, first check whether the measurement pressure piping system has a plugging phenomenon, no plugging, check the pressure change The transmitter output system has no change, there are changes, the fault is in the controller measurement indicator system.
3. Flow Control Instrument System Failure Analysis Steps (1) When the flow control instrumentation system indicates the minimum value, first check the on-site detection instrument. If it is normal, the fault is displaying the instrument. When the on-site detection instrument indicator is also the smallest, check the opening degree of the regulating valve. If the opening degree of the regulating valve is zero, it is often a fault between the regulating valve and the regulator. When the on-site detection instrument indicates the minimum and the opening of the regulating valve is normal, the cause of the malfunction is likely to be caused by insufficient system pressure, blockage of the system piping, loss of the pump volume, crystallization of the medium, improper operation, and the like. If the instrument is faulty, the reasons are as follows: orifice differential pressure flowmeter may be positive pressure induction conduit plug; differential pressure transmitter positive pressure chamber leakage; mechanical flowmeter is gear stuck or filter plugging.
(2) When the indicated value of the flow control instrument system reaches the maximum, the detection instrument will often indicate the maximum value. At this point you can manually control the valve to open large or small, if the flow can be reduced, it is generally caused by the process operation. If the flow rate does not fall, it is the cause of the instrument system. Check whether the regulating valve of the flow control instrumentation system operates; check whether the instrument measures the pressure stimulating system is normal; check whether the instrument signal transmission system is normal.
(3) The flow control instrumentation system indicates that the value fluctuates more frequently. The control can be changed to manual. If the fluctuation is reduced, it is the cause of the instrument or the instrument control parameter PID is not suitable. If the fluctuation is still frequent, it is the process operation. Caused by.
4. Level control instrument system failure analysis steps (1) liquid level control instrumentation system indicator value changes to the maximum or minimum, you can first check the instrument to see if it is normal, if the instructions are normal, change the liquid level control to manual remote control liquid level, see Level changes. If the liquid level can be stabilized in a certain range, the fault is in the liquid level control system; if the liquid level cannot be stabilized, it is generally a fault caused by the process system, and the cause must be looked up from the process.
(2) When the differential pressure type liquid level control instrument indicator and on-site direct-reading indicator instrument indicator are not on, first check whether the direct-reading indicator instrument is normal. If the indicator is normal, check the negative pressure guide of the differential pressure level instrument. If there is leakage, refill the liquid and adjust the zero point; if there is no leakage, the negative migration amount of the instrument may be wrong. Adjust the migration amount to make the indicator normal.
(3) When the indicating value of the liquid level control instrumentation system changes frequently and fluctuates frequently, it is necessary to first analyze the capacity of the liquid level control object to analyze the cause of the failure. The large capacity is generally caused by instrument failure. The first thing to do is to analyze whether there is any change in the process operation. If there is any change, it is likely that the process will cause frequent fluctuations. If no change may be caused by instrument failure.
The above is only the on-site four-parameter control parameters of the instrument's field failure analysis, the actual site there are some complex control loops, such as cascade control, split control, program control, interlock control and so on. The analysis of these failures is more complex and requires detailed analysis.
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Angular speed 760 820820/760 type angle Chi pressure tile machine parameters and operation methods of angular speed 760 820820/760 type angle Chi pressure tile machine type 760 machine angle) is the renewal of traditional roof forming machine products, the machine is mainly composed of a loading frame, a charging rack, feeding into platform, forming machine, forming cutting device, the hydraulic pressure station, the computer control box consists of several.
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Four major measurement parameters instrument control system failure analysis steps
1. Temperature control instrument system failure analysis step analysis Temperature control instrument system failure, we must first pay attention to two points: The system instrument uses electric meter measurement, indication, and control; the system instrument measurement is often lagging behind.