This video shows how to wire the SMPS power supply module to the RAMPS 1.5 board.
SMPS converts AC to DC. So this job starts from connecting the AC power wire to the SMPS. You can see all the details of the wiring AC power cord to the SMPS.

And I use a power switch to make it possible to turn on and off the whole controller system at once.
In this tutorial, I will show you the wiring process in detail.

You can see full instructions in the link below.
https://www.instructables.com/id/Buil...

0:00 Intro
0:07 Step 1. Parts List
0:32 Step 2. Wiring AC Power Cord to SMPS
2:13 Step 3. Wiring the Power Switch
4:58 Step 4. Attaching Switch and Wires
7:21 Step 5. Testing the Power Line