AC 1 and AC 2 run to you 110 input, with maybe a 2 contact switch wired in series with the blue wire for your power on off. nothing to do with the motor wiring.
Look at this one I made up, see if it makes sense.
I have read cautions not to run the equipment ground from your power cord to the chassis of the board. I run my power cord ground wire straight to the motor frame, bypassing the board.
Now, My turn, l hope my picture makes sense.
A+ OR A- from the board, to one of the center terminals of the DPDT switch.
The other A+ OR A- to the other center terminal of the DPDT switch.
Criss-cross wires corner to corner as shown,
Now, either the Top 2 OR the Bottom 2 of the (*EDIT DPDT switch) go to the DC motor as shown.
*It is a Double Pole Double Throw switch.
Some guys will power tap, throwing the switch under power, with no Ill effects, but other boards, (KBIC-120) caution you to turn off A/C power, OR Dial your Speed control to "0" before switching directions.
I am not really sure.
I usually (Always am) cautious, and dial down to "0" before switching directions.
Hope This makes sense.
EDIT,
In my switch picture, I named the center DPDT switch wires, "Power in"
Maybe that caused confusion. Not A/C power, as you can see now,
But D/C motor Power from the board.
EDIT # 2
If you see a picture or chart elsewhere, showing the 2 center wires going to the motor, and the 2, Top OR Bottomwires coming from the board A+ and A- this is correct also, it will work both ways. But I usually do it the way shown In my picture, to keep it simple.
EDIT.
Note,
This Information applies to D/C Motors Only, to reverse them, and not
Normally to A/C motors.