Fuji Electric PXR4 Instruction Manual page 7

Standard : Vertical mounting, flush on the panel. (The controller is horizontal.)
When mounting the controller on tilted surface, the maximum tilt angle is 30° (degree) from virtical.
(Caution)
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•
Don't block the openings around the controller, or radiation effect will be re-
duced.
Don't block the ventilation openings at the top of the terminal block.
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