The request
“A valve start-stop seal-in rung with a start button and valve auxiliary contact in parallel, a normally closed stop button, and a valve command output coil.”
Then tryAdd a valve open limit contact.Change the output to a pump command.
What is in this drawing
Read the decisions behind it.
01
Use of seal-in contact to maintain state after button release
02
Normally closed stop button for fail-safe operation
This pattern applies to any motor, valve, or actuator that requires a maintained run signal from momentary pushbuttons.
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