Omron TJ2-MC02 Hardware Reference Manual page 140

Hardware reference
Step 10
Press down carefully the two locking pins (no. 1) of the Option Board.
Press carefully the top of the Option Board in the Inverter.
Check the Option Board is being locked by the locking pins (no.1).
Step 11
Insert the screw (no. 1) into the upper right hole in the Option Board (no.2).
Tighten the screw into place (do not over tighten).
HARDWARE REFERENCE MANUAL
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