Current sensing relay with delay on break for dust collection system
Your topology is super wonky. Here is what you are looking for. Also, the time delay relay you chose won't do what you want. This or something similar is the relay that you want. 

https://www.amazon.com/Liukouu-GRT8-B1-Power-Delay-12V-240V/dp/B07VB9BMZL/ref=sr_1_5?keywords=delay+off+relay&amp;qid=1579709274&amp;s=home-garden&amp;sr=1-5







simulate this circuit &ndash; Schematic created using CircuitLab