Single-seat electric control valve performance is good or bad will directly affect the quality of the whole control system work. Because the single-seat electric regulating valve at the scene is in direct contact with the modulated medium, work environment is very bad, so easy to produce all kinds of faults. In the process of production, in addition to eliminate these problems at any time, also must carry out regular maintenance and preventive maintenance. Especially for use at bad environment regulator, more should pay attention to maintenance and preventive maintenance. Different forms of single-seater electric control valve, and its failure and its reason is not the same. Fault a: actuator is not action, but the power control module and the lights are bright. Methods: check the power supply voltage is correct; Whether the motor wire break; Ten core plug from the end to whether wire terminal bolt; Motor, potentiometer, capacitance all plugs are in good condition; In contrast to swap method to determine whether a control module is good. Fault 2: actuator is not action, the power light and signal light is not bright. Methods: check input signal polarity is correct; In contrast to swap method to determine whether a control module is good. Fault 3: adjust the system parameter setting properly actuators frequent oscillations. Methods: the controller parameter setting is not appropriate, will cause the system to produce different degree of oscillation. For single loop control system, the proportional band is too small, the integral time is too short, differential gain and differential time mostly system oscillation may be produced. Can through the system setting, the method of reasonable selection of these parameters, the loop stable speed. Fault 4: actuator motor fever quickly, concussion crawling, stop action within a short period of time. Processing method: using ac 2 v voltage profile measurement control module whether the input ac interference; Check whether signal lines and power cord isolation; Potentiometer and potentiometer wiring are in good condition; Feedback component action is normal. Fault 5: actuator action with step by step, crawl phenomenon, action is slow. Processing method: check operator signal from the action time is correct. Fault 6: actuator position feedback signal is too big or too small. Methods: check the 'zero' and 'stroke' potentiometer adjustment is correct; Replace control module. Fault 7: actuator signal when fully open or close, no limit switch. Methods: check the function selection switch control module in the correct position; 'Zero' and 'stroke' potentiometer adjustment is correct; Replace control module. Fault 8: actuator range, chirping. Processing method: mainly because sensitivity adjusted too high, not sensitive area is too small, too sensitive, the actuator small oscillation circuit cannot be stable, can reduce the sensitivity counterclockwise fine-tuning potentiometer sensitivity; Fluid pressure change is too big, thrust actuator; Regulating Industrial Valves selection, valve used in small open work. Fault nine: actuator movement is not normal, but limit switch motor does not stop after the action. Processing method: check whether there is limit switch, limit switch wiring fault; Replace control module. Failure: 10 actuators belt is broken. Methods: check actuator damage internal driving part is stuck; 'Zero' and 'stroke' potentiometer adjustment is correct; Limit switches are correct. To avoid the interference of the power cord, single-seater electric regulating valve signal lines using shielded cable, with the power cord and shielding; Electrical wiring should have enough capacity to meet the requirements of the actuator rated current and starting current; Installation of ground wire, connect the power supply and signal lines, should be cut off power supply to prevent electric shock; Connect the power supply terminals, creepage distance and clearance should be greater than 8 mm; Check the aging problem of sealing ring, change in time; Open again after power off during maintenance, protected from short circuit.
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