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Hydraulic Valve Casting Fault Judgment

Yutung Industrial Limited | Updated: Jun 02, 2017

A light 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: the power indicator light does not shine, first check 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, Check with the multimeter to find the indicator light 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 carefully check the feedback line to confirm the feedback signal is no 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 there is a problem with the thyristor, first Check the indicator light, with a multimeter to detect off the indicator light open, replace the troubleshooting.Hydraulic Valve Casting

Conclusion: The thyristor does not operate when the indicator is off (open).

Resistor Capacitance

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.Hydraulic Valve Casting

Conclusion: When encountering the above fault phenomenon, first of all to determine the fault occurred in that part, and finally determine the root causes.Hydraulic Valve Casting

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.