Dell PowerVault 720N Installation And Troubleshooting Manual page 35

1-U marking on
vertical rail
1/2-U increment
in vertical rail
align lower edge of support
rail with one of these locations
1-U increment
in vertical rail
2. To attach each rack adapter rail to whole-U or half-U positions on the vertical rails,
perform the following steps:
a. At the front of the rack, install the rack adapter rail using threaded holes 1
and 5 for whole-U positions and holes 2 and 6 for half-U positions (see
Figure 2-2).
b. Secure the front of each rack adapter rail with two 10-32 x 0.375-inch coun-
tersunk screws with conical washers provided with the mounting hardware
(see Figure 2-2).
c. Using a torque-measuring wrench, tighten the rack adapter rail to the vertical
rail to 27 inch pounds (3.0 newton meters).
front vertical rail
grouping of three
IU
evenly-spaced holes
Installing a Filer System 2-5