User Manual

Constellation ES.3 SAS Product Manual, Rev. F 53
10.3 Drive mounting
Mount the drive using the bottom or side mounting holes. If users mount the drive using the bottom holes, ensure that users do not
physically distort the drive by attempting to mount it on a stiff, non-flat surface.
The allowable mounting surface stiffness is 80 lb/in (14.0 N/mm). The following equation and paragraph define the allowable
mounting surface stiffness:
where K is the mounting surface stiffness (units in lb/in or N/mm) and X is the out-of-plane surface distortion (units in inches or
millimeters). The out-of-plane distortion (X) is determined by defining a plane with three of the four mounting points fixed and
evaluating the out-of-plane deflection of the fourth mounting point when a known force (F) is applied to the fourth point.
Figure 19. Breather hole location - top cover
10.4 Grounding
Signal ground (PCBA) and HDA ground are connected together in the drive and cannot be separated by the user. The equipment in
which the drive is mounted is connected directly to the HDA and PCBA with no electrically isolating shock mounts. If it is desired for
the system chassis to not be connected to the HDA/PCBA ground, the systems integrator or user must provide a nonconductive
(electrically isolating) method of mounting the drive in the host equipment.
Increased radiated emissions may result if users do not provide the maximum surface area ground connection between system
ground and drive ground. This is the system designer’s and integrator’s responsibility.
Note
Do not cover breather hole on top cover.
K x X = F < 15lb = 67N
Breather Hole
Do Not
Cover