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Welcome. My name is ***** ***** would be glad to assist.
Can you get a picture of the controls? There must be some relays and such for the start stop to operate, is that correct?
How are you attempting to add this extra pump motor?
Let me know some further details and we can continue,
Ok, thanks for the pictures, but they really do not provide any information, cannot tell what is going on there.
I need the details of how the start stop is wired to the contactors you have and then how the motor is connected.
Diagram can show how it all is wired
It sounds like the stop is not opening the circuit, the stop button is wired in series with the start so the stop button shuts off the power when pressed.
While I appreciate the extra effort with the pictures, they do not provide information on HOW anything is wired.
Only able to see where wires are landed on the various items which doesnt relate to where they go or land on the other end.
If the new pump was added, there should be documentation of exactly how it was added in the wiring scheme.
Is there not any schematics on the original setup and wiring? That is a must in any control scheme.
Look at the below on how starters are wired to start stop stations as a reference from one of my schematics.