I am building a small system that includes two Meanwell LRS-100 series power supplies:
Note the photograph on the first page of the data sheet, and the drawings on the last page showing threaded holes along one edge and on the bottom of the unit. I would like to mount the units standing up vertically (on the flat bottom of my chassis), with the narrow edge (with 3 screw holes) downwards. From Meanwell's documentation, it is unclear if this is permissible, and if so, how performance might be de-rated.
Their one-size-fits-all installation manual:
... states "Mounting orientations other than standard orientation or operate under high ambient temperature may increase the internal component temperature and will require a de-rating in output current. Please refer to the specification sheets to receive the optimum mounting position and information about the de-rating curve."
But the LRS-100 series data sheet (the first link above) contains no such information. Telephone tech support confirms that the unit must be installed within the end-system, and that the system must contain 3X the volume of the PS, and that ANY orientation is acceptable. The agent did not inspire confidence, and I find this improbable: e.g. with the large flat side with ventilation holes facing downward, and the solid side (with two screw holes) facing upwards ?!?
So I seek guidance as to whether my vertical orientation is acceptable, and if so, how much de-rating might be required.