Proface GP4600R - 12.1 Standard HMIs with Rear Mounting Options" - Manual (Page 27)

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Installation
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8 When you are installing the GP unit horizontally, hold the GP unit
so that the arrow pointing in the horizontal direction on the rear
surface of the GP unit points up as shown in the figure.
1) Figure of the GP unit's rear surface when attaching installation
brackets at the top and bottom surfaces of the GP unit
2) Figure of the GP unit's rear surface when attaching installation
brackets on either side of the GP unit
9 Insert the GP unit through the rear surface of the panel, pass the
stud bolts through the four installation bracket holes, and then
tighten nuts on the stud bolts to fix the GP unit in place. The
tightening torque is 0.8 N•m to 1.0 N•m (7.1 lb-in to 8.9 lb-in).
 
Installation diagram (profile)