Valve electric device is the execution unit of many combined control instruments. It can accept unified standard signals, transfer these models into standard parameters, and output sufficient mechanical torque. To drive the valve to complete various actions. So what faults can occur during the execution of a small electric motor, and how can I eliminate them?
Output shaft displacement changes, position feedback current is less than 10mA
Solution: shake the hand wheel to move the output rod of the actuator to a large stroke, then open the cover of the position transmitter, adjust the potentiometer W3, and adjust the millimeter to 10 mA accurately. The opening degree corresponds to the feedback current.
Talking about the relationship between valve electric device and valve
When the electric operator is manual, the actuator does not move
When the switch of the manipulator is in the manual position, the operation switch is not moved when the operation switch is turned in two directions of "open" or "closed". Under normal circumstances, put the operator switch in the manual position to turn on the power, and the "manual" indicator light is on. Toggle the operation switch in the "on" direction, and the output shaft should increase in the upward direction, while the pointer of the valve position opening degree table changes from o% to 10%. Toggle the operation switch in the "closed" direction, the output shaft should descend downward, and at the same time, the pointer of the valve position opening degree indicator changes.
When the operator is automatic, the actuator does not move
The operator works normally when it is manual, but when it is automatic, the servo input is not zero, and the output shaft of the actuator maintains a certain valve position, and does not turn to the predetermined position. The solution is to reverse the phase zero of the servo amplifier.