one. Indicator light failure 1. Fault phenomenon: After powering the electric actuator, the power indicator light is not lit, and there is no feedback from the servo board. The signal does not work.
Fault judgment and maintenance process:
Because the power indicator is not lit, first check whether the fuse is open. After checking the fuse is intact, the fault phenomenon can be inferred. The fault may occur in the power supply part of the servo board. Then check the power indicator and use the multimeter to detect the indicator. Open the circuit and replace the indicator light to troubleshoot.
Conclusion: The power indicator light will open the entire servo board.
2. Fault phenomenon: (found in debugging)
After the actuator of the electric actuator is energized, the signal can be turned on and off.
Fault judgment and maintenance process: first check the feedback line carefully to confirm that the feedback signal is not faulty. When the signal is turned on, the indicator light is on, indicating that the power is on normally. When the signal is off, the off indicator light is off, indicating that there is a problem with the thyristor part. First, Check the off indicator light, use the multimeter to detect the open indicator light, and replace it after troubleshooting.
Conclusion: The thyristor does not operate when the off and on indicators are off (open).
two. Resistor-capacitor
1. Failure phenomenon:
After the PSL210 actuator is energized, given a signal (eg 75%), the actuator will fully open to the end and then return to the specified position (75%).
Fault judgment and maintenance process:
According to the above fault phenomenon, it is first necessary to judge that there is a problem with the servo board and the actuator. Remove the servo plate from the actuator, directly connect the power cable to the X5/1 and X5/4 terminals, and perform the closing action of the actuator. Connect the power cable to the X5/1 and X5/2 terminals. In the open direction, if the actuator does not operate normally, the fault is on the actuator. Use a multimeter to measure the normal winding of the motor, and then measure the resistance on both sides of the capacitor to find an open circuit, and replace it after troubleshooting.
Conclusion: When encountering the above fault phenomenon, first determine the fault on which part, and finally determine the root cause.
2. Fault phenomenon: After the actuator is energized, the actuator (4mA) is fully turned on and then fully turned off.
Fault judgment and maintenance process: first remove the servo plate, directly energize the actuator to find that there is still the original fault, check the resistance, the resistance value is normal, indicating that the resistance is no problem, check the motor winding, find the resistance is normal, the motor is no problem.
Therefore, it is inferred that the capacitor may be broken, the capacitor is replaced, and the fault is eliminated.
Conclusion: The first problem is the resistance and capacitance when this problem occurs.
3. Other
1. Fault phenomenon: As long as the AC220V power supply is sent to the site, the protection switch immediately operates (tripped). The actuator has been burned.
Fault judgment and maintenance process: Firstly, the motor winding on the actuator is detected by a multimeter. It is found that the resistance of the motor winding tends to zero, indicating that the motor has been short-circuited, and then the resistance at both ends of the brake is detected. The resistance tends to infinity, indicating that the brake is broken. Normal should be around 1.45K. The final treatment method is: replace the new brake and motor, install the fuse of the servo plate, re-commission, and resume normal operation.
Conclusion: This situation should be caused by the brakes being locked after the brakes are broken and the scene is not found in time, so that the motor is blocked for forwarding heat for a long time, and the work eventually causes the insulation of the motor to be damaged. (PSQ700)
2. Fault phenomenon: The action direction of the actuator is not controlled by the input signal.
Fault judgment and maintenance process: First check that the two current limiting resistors and phase shifting capacitors are not abnormal. Check the winding resistance of the motor with a multimeter and find that the resistance value of the motor is 1.45MΩ (and changes from time to time), indicating that the motor winding is incorrect. The final solution is to replace this motor (PSQ200).
3. Fault phenomenon: The action direction of the actuator is not controlled by the servo board.
Fault judgment and maintenance process: First, let the user use the multimeter to detect the resistance of the two current limiting resistors and the phase shifting capacitor and the winding of the motor. The user's inspection result is consistent with the final data provided by us. In addition to these three factors, there is no other possibility. The user only wants us to send people to the scene. Tian Guangri just went to Hangzhou and went to the scene. I found one of the current limiting resistors to open the way and let the company send a current limiting resistor. This case shows that this user does not cooperate with our work at all, and some of the situations reflected are somewhat different from the actual situation. I think that the three factors that affect the steering of the actuator are the winding current limiting resistor 3 of the 1 motor (PSL208) itself, and the phase shifting capacitor is considered.
4 fault phenomenon: no matter what signal the motor gives, the motor does not work.
Fault judgment and maintenance process: power is directly supplied between the motor windings, the motor is not transmitted, the brake is removed and the energized motor is not turned, the resistance of the detected motor windings is normal, and the operation of the handwheel shake actuator is normal. The result of the test is normal. The motor does not turn when the power is turned on. At this time, the rotor of the motor is suspected, the motor is disassembled, and the rotor is found to be unscrewed by hand. The original rotor and the motor end cover have a solid ash. After the layer of ash is removed, add a little oil and twist it by hand. Refit the motor and install it with the actuator. Power on and re-commission.
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