Rockwell Automation SA500 AC Power Modules - Manual (Page 30)

4-2 SA500 Power Modules
Step 1. Mount the Power Module. Power Modules are designed to be mounted
vertically on a flat surface using M5 or #10 screws. The holes in the top
flanges are key-hole shaped and the lower hole is U-shaped to facilitate
mounting.
The Power Module should be mounted in a location with good air flow and
must be in close proximity to the DC Bus Supply. Power Modules should not
be mounted one over another because the exhaust air from the lower Power
Module would feed the air intake of the upper Power Module. The minimum
distance above and below the Power Module is 85 mm (3.4 inches). Allow
13 mm (0.5 inch) between any Power Module and the side wall of an
enclosure. Allow 3 mm (0.125 inch) between individual Power Modules. See
figure 4.1.
When multiple Power Modules are being installed, the Power Modules with
the highest current rating should be placed closest to the DC Bus Supply.
Note that the Power Modules should be evenly distributed on each side of the
DC Bus Supply. If two Power Modules are being used, one should be
mounted to the left of the Bus Supply and one should be mounted to the
right. If four Power Modules are being used, two should be wired from the left
of the Bus Supply and two from the right. If an odd number of Power Modules
is being used, the Power Modules should be distributed as evenly as possible
on each side of the Bus Supply. This method of Power Module placement
minimizes wire length, which reduces wire inductance.
See the DC Bus Supply instruction manual (S-3017) for information on how
to calculate the maximum number of Power Modules that can be sourced
from one DC Bus Supply.