electric Industrial Valves electric actuator is the overall pilot control Industrial Valves, if when it appeared some common failures, our customers have any response to the method of inspection and repair? Today we have to explain for everybody. 1 light malfunction. Fault phenomenon: electricity for electric machine and found the power indicator light is not bright, bar plate without feedback, give the signal is not action. Failure diagnosis and maintenance process: due to the power indicator light is not bright, first check whether the insurance tube is open, through inspection insurance tube in good condition, comprehensive failure phenomenon, can be concluded that failure may occur in the power supply section of the bar put board, then check the power indicator light, use multimeter to detect light is open circuit, replace the lamp troubleshooting. Conclusion: the power indicator light will cause the entire bar open board doesn't work. 2. Fault phenomenon: Found in debugging) After electric actuator, electric actuators to signal can, doesn't close action. Failure diagnosis and maintenance process: first check feedback circuit, trouble-free, confirm feedback signal to the drive signal indicator, a normal, to shut when the signal light is not bright, show off thyristor part has a problem, first check the indicator light, using a multimeter to detect light is open, it replaced and troubleshooting. Conclusion: closed and open light is not bright, Open circuit) When thyristor is not action. Fault phenomenon: electric actuators after electrify, given a signal, Cases 75%) , the actuator will be fully open to the end, then back to the specified location ( 75%) 。 Failure diagnosis and maintenance process: according to the above failure phenomenon, the first thing to judge is bar set the a plate and the actuator has a problem. Put bar plate removed from the actuator, directly to the power cords and X5/4 X5/1 terminal, actuator close direction movement, will power and x 5 X5/1/2 terminals, the executing agency to open direction of movement, if action is not normal, actuator fault on the actuator. Normal use multimeter to measure motor winding, and then measure the resistance is found to have an open on both sides of the capacitance, the replacement after troubleshooting. Conclusion: the above failure phenomenon, the first to determine failure on the one part, finally determine the root cause. 2. After failure phenomenon: electric actuator to pass signals ( 4mA） Actuator fully open again after seated first. Failure diagnosis and maintenance process: first, to dismantle bar plate, directly to the electric actuator found there is still the original fault, check the resistance, the resistance value is normal, that resistance is no problem, check the motor winding, found that the resistance is normal, no problem. Thus fault inference is possible capacitance bad, replace capacitance, troubleshooting. Conclusion: the problem when the first suspected resistance and capacitance. 3. Other 1, fault phenomenon: the scene as long as send AC220V power supply, protection switch immediately action ( Trip) Actuator bar insurance burned. Failure diagnosis and maintenance process: first, the multimeter on test actuator motor winding, found that the motor winding resistance tends to zero, shows that the motor has a short circuit, then test the brake on both ends of the resistance, resistance tends to infinity, that the brake has been bad, normal should be 1. About 45 k. The final treatment method is: replace the brake and motor, put the bar plate insurance tube mount, readjusted, return to normal operation. Conclusion: the situation should be due to the brake is broken after the motor lock and the scene was found in time, make the motor forward wall heat for a long time, and eventually make the motor work insulation damage caused. （ PSQ700） 2, fault phenomenon: movement direction of the actuator is not controlled by the input signal. Failure diagnosis and maintenance process: first check the two current limiting resistor and the phase-shift capacitor are no exception, with a multimeter to check the motor winding resistance, found that the resistance of the motor was 1. 45 mΩ （ And change from time to time) That motor winding is wrong, the final way is to replace the electric motor ( PSQ200） 。
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