I am working in oil & gas field, for fire water system to protect oil tanks.
In the installation we have 95 electrical valves supplied with 220VAC.
The actual problem is we have 25 valves which are opening only, I mean when you send opening command from plc the valve open, same thing when you send closing command.
I will try to simplify our installation, the valves are feeded from UPS, going to panel field, inside panel there is distribution of 220V.
Each valve is feeded by separate breaker, if all the breakers are off, except breaker of “x” is on, the valve work properly, but when we start to turn on the others breakers on, the valve will start to open only in booth case.
Can any one advice how we can solve this problem?
Regards.
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Looks like its due to induction voltage.
If possible, check the cable routes, any HT cables passing or any other reasons.
Lay Temporary cables for one or two solenoid valves & check the open/close problem exists or not.
Note : Lay the cable in separate route or where there will be no high voltage around the area for testing.
You can also use a Snubber circuit to minimize the induction voltage across solenoid valves, check the following articles.
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