Fault and treatment method of electric regulator valve
The working performance of the electric regulator valve will directly affect the working quality of the whole regulation system. Because the electric regulating valve is in direct contact with the tuned medium in the field, the working environment is very bad, so it is easy to produce all kinds of faults. In addition to troubleshooting these faults at any time during the production process, regular maintenance and regular repairs are required. Especially for the use of the environment is particularly harsh control valve, more attention should be paid to maintenance and regular maintenance.
Different forms of single-seat , its failure and its causes are not the same.
Fault One: Actuator motor heat quickly, concussion crawl, stop action in a short period of time.
Treatment method: Using AC 2V voltage to measure whether the input of the control module AC interference movement, check whether the signal line is isolated from the power cord, potentiometer and potentiometer wiring is good, the feedback component action is normal.
Fault Two: Actuator action is stepping, crawling phenomenon, slow movement.
Handling method: Check that the signal action time coming from the operator is correct.
Fault three: The actuator position feedback signal is too large or too small.
How to handle: Check that the “0-bit” and “trip” potentiometer adjustments are correct; Replace the control module to determine.
Fault four: Add the signal after the actuator is fully open or full off, the limit switch is also non-stop.
Processing method: Check whether the function of the control Module selector switch is in the correct position, “0-bit” and “trip” potentiometer adjustment is correct, replace the control module judgment.
Fault five: The actuator does not act, but the control module power supply and signal light are on.
Treatment method: Check whether the power supply voltage is correct, whether the motor is disconnected, whether the ten-core plug is disconnected from the end to each line terminal, whether the motor, potentiometer, capacitor plug is good, and use the contrast interchange method to determine whether the control module is good.
Fault Six: Actuator does not move, power light is on and the signal light is not lit.
Treatment method: Check whether the polarity of the input signal is correct, and use the contrast interchange method to determine whether the control module is good.
Fault Seven: Improper adjustment of the parameters of the system causes the actuator to oscillate frequently.
Treatment method: The regulator’s parameter tuning is not suitable, will cause the system to produce different degrees of oscillation. For single-loop regulation system, the proportional band is too small, the integration time is too short, and the differential time and differential gain are mostly likely to produce system oscillation. These parameters can be selected reasonably through the method of system tuning, so that the loop will maintain a stable speed.
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