What are the common faults of electric valve actuators?
Published：2016-07-25 Views：1637 times
Electric Actuator Electric Actuator (also known as electric actuator), English name: Electronic Actuator, electric valve actuator refers to the energy as the main source of energy, used to drive the valve machinery. Used in a variety of industrial automation process control links. Industry standard: JB / T-8219-1999. The angular actuators are divided into: angular travel, partial swivel and multi-turn.
1. Indicator failure
1. Symptom:
To the electric actuator power and found that the power indicator light does not shine, servo board without feedback, to the signal does not move.
Fault diagnosis and maintenance process:
If the power indicator does not light, first check whether the fuse is open, check the fuse tube intact, comprehensive fault phenomenon, you can infer the fault may occur in the power supply part of the board, and then check the power indicator, with a multimeter detection indicator Open, replace the lights troubleshooting. Conclusion: The power indicator opening will cause the entire servo board to not work.
2. Symptom: (found in debugging)
After the actuator of the electric actuator is energized, the signal can be turned on and off.
Fault diagnosis and maintenance process:
First check the feedback line, to confirm the feedback signal without fault, to open the signal when the light is on, indicating that the normal, to the signal off when the indicator light does not light, indicating that the SCR part of the problem, first check the indicator light, The multimeter detects that the indicator is open and is removed after troubleshooting. Conclusion: The thyristor does not operate when the indicator is off (open).
Resistor Capacitor
1. Symptom:
When the actuator is energized, given a signal (example 75%), the actuator will be fully open and then back to the specified position (75%).
Fault diagnosis and maintenance process:
According to the above fault phenomenon, we must first determine the servo board and the implementation of a problem. Remove the servo board from the actuator, directly to the power cord connected to the 2 and 4 terminals, the implementation of the direction of the action, the power cord connected to the 2 and 3 terminals, the implementation of the direction of action, if the actuator action Abnormal, indicating fault on the actuator. With a multimeter to measure the motor winding normal, and then test the resistance on both sides of the capacitor found an open circuit, replace the troubleshooting after troubleshooting.
Conclusion: When encountering the above fault phenomenon, first of all to determine the fault occurred in that part, and finally determine the root causes. 2. Symptom: (found in debugging)
After the actuator is energized, the actuator (4mA) is fully closed and fully closed.
Fault diagnosis and maintenance process:
First remove the servo board, power supply directly to the executive found that there are still the original fault, check the resistance, resistance resistance is normal, indicating that the resistance is no problem, check the motor windings and found that the resistance is normal, the motor no problem. The fault is inferred that there may be a bad capacitor, re-replace the capacitor, troubleshooting.
Conclusion: The problem first arises resistance and capacitance.
Three other1. Symptom:
As long as the scene to send AC220V power supply, the protection switch immediately action (trip) Actuator insurance has been burned.
Fault diagnosis and maintenance process:
First with a multimeter to detect the motor winding on the actuator and found that the resistance of the motor winding tends to zero, indicating that the motor has been short-circuit, and then check the resistance at both ends of the brake, the resistance tends to infinity, indicating that the brake has been bad, the normal should be about 1.45K The The final approach is to: replace the new brake and motor, put the board of the insurance tube installed, re-debugging, to resume normal operation.
Conclusion: When encountering the above fault phenomenon, first of all to determine the fault occurred in that part, and finally determine the root causes.
2. Symptom: (found in debugging)
The operating direction of the actuator is not controlled by the input signal.
Fault diagnosis and maintenance process:
First check the two current limiting resistor and phase-shifting capacitors are no exception, with a multimeter to check the motor winding resistance and found that the motor resistance value of 1.45MΩ (and from time to time change), indicating the motor winding is wrong, the final way is to replace This motor.
3, the phenomenon:
The direction of action of the actuator is not controlled by the servo board.
Fault diagnosis and maintenance process:
First let the user with a multimeter to detect two current limiting resistor and phase-shifting capacitor and motor winding resistance, the user's test results and we provide the final data. In addition to these three factors, there is no other possibility, the user just want us to send people in the past scene, the technical staff just in the local way to the scene and found one of the current limiting resistor open, let the company to send a current limiting resistor in the past, This case shows that this user does not cooperate with our work, some reflect the situation and the actual difference. I think the three factors that affect the steering of the actuator is the winding of the motor itself, the current limiting resistor, the phase-shifting capacitor, which is considered from these three aspects.
4, the phenomenon:
No matter what signal on the scene to the motor does not move,
Fault diagnosis and maintenance process:
Directly in the motor winding between the power, the motor does not pass, brake brake to remove the motor or not turn, the detection of motor winding resistance are normal, hand wheel shake actuator normal operation. The detection of the results are normal when the motor does not turn, then suspect the motor rotor, the motor apart and found that the rotor hand are screwed, the original rotor and the motor cover has a layer of strong between the gray, this After the layer of ash removed, add a little oil, you can twist the hand. Re-install the motor and with the implementing agencies with the equipment, power normal, re-debugging.
1. Indicator failure
1. Symptom:
To the electric actuator power and found that the power indicator light does not shine, servo board without feedback, to the signal does not move.
Fault diagnosis and maintenance process:
If the power indicator does not light, first check whether the fuse is open, check the fuse tube intact, comprehensive fault phenomenon, you can infer the fault may occur in the power supply part of the board, and then check the power indicator, with a multimeter detection indicator Open, replace the lights troubleshooting. Conclusion: The power indicator opening will cause the entire servo board to not work.
2. Symptom: (found in debugging)
After the actuator of the electric actuator is energized, the signal can be turned on and off.
Fault diagnosis and maintenance process:
First check the feedback line, to confirm the feedback signal without fault, to open the signal when the light is on, indicating that the normal, to the signal off when the indicator light does not light, indicating that the SCR part of the problem, first check the indicator light, The multimeter detects that the indicator is open and is removed after troubleshooting. Conclusion: The thyristor does not operate when the indicator is off (open).
Resistor Capacitor
1. Symptom:
When the actuator is energized, given a signal (example 75%), the actuator will be fully open and then back to the specified position (75%).
Fault diagnosis and maintenance process:
According to the above fault phenomenon, we must first determine the servo board and the implementation of a problem. Remove the servo board from the actuator, directly to the power cord connected to the 2 and 4 terminals, the implementation of the direction of the action, the power cord connected to the 2 and 3 terminals, the implementation of the direction of action, if the actuator action Abnormal, indicating fault on the actuator. With a multimeter to measure the motor winding normal, and then test the resistance on both sides of the capacitor found an open circuit, replace the troubleshooting after troubleshooting.
Conclusion: When encountering the above fault phenomenon, first of all to determine the fault occurred in that part, and finally determine the root causes. 2. Symptom: (found in debugging)
After the actuator is energized, the actuator (4mA) is fully closed and fully closed.
Fault diagnosis and maintenance process:
First remove the servo board, power supply directly to the executive found that there are still the original fault, check the resistance, resistance resistance is normal, indicating that the resistance is no problem, check the motor windings and found that the resistance is normal, the motor no problem. The fault is inferred that there may be a bad capacitor, re-replace the capacitor, troubleshooting.
Conclusion: The problem first arises resistance and capacitance.
Three other1. Symptom:
As long as the scene to send AC220V power supply, the protection switch immediately action (trip) Actuator insurance has been burned.
Fault diagnosis and maintenance process:
First with a multimeter to detect the motor winding on the actuator and found that the resistance of the motor winding tends to zero, indicating that the motor has been short-circuit, and then check the resistance at both ends of the brake, the resistance tends to infinity, indicating that the brake has been bad, the normal should be about 1.45K The The final approach is to: replace the new brake and motor, put the board of the insurance tube installed, re-debugging, to resume normal operation.
Conclusion: When encountering the above fault phenomenon, first of all to determine the fault occurred in that part, and finally determine the root causes.
2. Symptom: (found in debugging)
The operating direction of the actuator is not controlled by the input signal.
Fault diagnosis and maintenance process:
First check the two current limiting resistor and phase-shifting capacitors are no exception, with a multimeter to check the motor winding resistance and found that the motor resistance value of 1.45MΩ (and from time to time change), indicating the motor winding is wrong, the final way is to replace This motor.
3, the phenomenon:
The direction of action of the actuator is not controlled by the servo board.
Fault diagnosis and maintenance process:
First let the user with a multimeter to detect two current limiting resistor and phase-shifting capacitor and motor winding resistance, the user's test results and we provide the final data. In addition to these three factors, there is no other possibility, the user just want us to send people in the past scene, the technical staff just in the local way to the scene and found one of the current limiting resistor open, let the company to send a current limiting resistor in the past, This case shows that this user does not cooperate with our work, some reflect the situation and the actual difference. I think the three factors that affect the steering of the actuator is the winding of the motor itself, the current limiting resistor, the phase-shifting capacitor, which is considered from these three aspects.
4, the phenomenon:
No matter what signal on the scene to the motor does not move,
Fault diagnosis and maintenance process:
Directly in the motor winding between the power, the motor does not pass, brake brake to remove the motor or not turn, the detection of motor winding resistance are normal, hand wheel shake actuator normal operation. The detection of the results are normal when the motor does not turn, then suspect the motor rotor, the motor apart and found that the rotor hand are screwed, the original rotor and the motor cover has a layer of strong between the gray, this After the layer of ash removed, add a little oil, you can twist the hand. Re-install the motor and with the implementing agencies with the equipment, power normal, re-debugging.