The electric actuator uses AC servo motor as the driving device of the position dish servo mechanism. The 4-20mA DC control signal of the adjusting system is received by the matched position locator control board and compared with the position feedback borrow number of the position transmitter. The signal deviation after comparison is amplified to turn on the power level and the motor is rotated to drive. The output part of the mechanism moves in the direction of reducing this deviation (position transmitter continuously converts the actual position of the output part into electrical signal-position-gain feedback signal to position-based positioner), until the deviation signal is less than the set value. At this time, the output of the actuator is stabilized in the position corresponding to the input signal.
Troubleshooting of Resistance and Capacitance of Electric Actuator
Resistance and Capacitance Fault of Electric Actuator
1. Fault phenomena: Given a signal (example 75%) after the actuator is powered on, the actuator will open to the end, and then return to the designated position (75%).
Fault judgment and overhaul process: According to the above fault phenomena, the first thing to be judged is the problem of the servo board and the executive body. Remove the servo board from the actuator and connect the power cord directly to the X5/1 and X5/4 terminals. The actuator closes the direction and connects the power cord to the X5/1 and X5/2 terminals. The actuator moves in the direction. If the action of the actuator is abnormal, the actuator fails on the actuator. The multimeter is used to measure the normal winding of the motor, and then the resistance on both sides of the capacitor is measured. An open circuit is found and the fault is removed after replacing it.
Conclusion: When encountering the above fault phenomena, we should first determine which part of the fault occurred, and then determine the root cause after zui.
2. Fault phenomena: when the actuator is powered on, it gives the shutdown signal (4mA) to the actuator.
Fault judgment and overhaul process: first remove the servo panel, direct power to the actuator to find that there are still original faults, check resistance, resistance value is normal, that resistance is no problem, check motor winding, found that resistance value is normal, motor is no problem. From this fault inference, it is possible that the capacitor will be damaged, and the capacitor will be replaced and the fault will be eliminated.
CONCLUSION: Resistance and capacitance should be suspected first when this problem occurs.