Analysis of the reasons for sudden shutdown of intelligent electric valves during operation
Thread Content
The main steam valve electric actuator for one of our boilers is an intelligent multi-turn electric actuator; it is usually set to remote control mode and operated by the DCS. One day, suddenly the electric valve closed automatically, and the operator could not open it again. It has to be opened manually. The valve display shows a fault: overload. I would like to ask why it was shut down suddenly; please analyze it.
Can’t the fault be cleared, or is the module damaged?
There are chain bars! This question should be asked to the instrument
The electric valve also has a 220V motor; remove it to check whether there are any issues with the motor. Additionally, examine the circuit board – since the valve is used in a boiler, the high temperatures at the installation site can also have an impact on the electric valve
The display reports a fault, indicating overload. After it was suddenly turned off, the operator repeatedly tried to activate the signal, but there was no response. After consulting the manufacturer, the technical staff said that it might be the control board that is broken, and one is being sent over to replace it.
We have encountered this situation before as well, and it was resolved by replacing the control board.
The key is that this type of failure is highly hazardous. Ours is the main steam valve of the boiler. A sudden shutdown caused all the safety valves to activate. It’s too dangerous. I wonder if the manufacturer has any technical measures to prevent this phenomenon?
Faulty control circuit board, water ingress, wire cross-talk, interference
A faulty control board is a major cause; replacing it should solve the problem. There are also the following reasons: 1) The valve is indeed overloaded; this can be resolved by applying lubricant for maintenance. 2) For problems with the motor itself, the control board generally does not send an overload signal. 3) Check the supply voltage; a low voltage can also cause overload, although this reason is less likely to occur.