Alignment Pins With And Without Spacers - IBM TotalStorage DS4000 EXP100 Installation, User's, And Maintenance Manual

Attention: Both support rails are shipped with three screws and spacers,
called alignment pins, already installed at the front of each rail. They have
been inserted in the front of each support rail as guides to indicate where not
to use M6 screws when you attach the front of the support rail to the rack. See
Figure 16.
Alignment pins with spacers
1
2
Alignment pins without spacers
3
Figure 16. Alignment pins with and without spacers
Depending on which type of rack mounting flange is present on your rack, you
might have to remove some or all of the alignment pins. For example, if the
rack in which you are installing the support rails has round holes, you will need
to remove the spacers from the top and bottom alignment pins so that the rail
sits flush with the rack. See Table 7.
Table 7. Alignment pin requirements for different rack flange hole types
Rack flange type
Square hole
Round hole
Threaded hole
4. The rack-mounted unit is three EIA units high. Decide accordingly where you
are going to install the support rails.
Attention: Use the rack mounting template provided in Figure 14 on page 33
and Figure 15 on page 34 to locate the proper rack mounting holes for
installing the support rails into the rack.
Note the following considerations before you choose where to install the rails:
v If you are installing the EXP100 into an empty rack, install it into the lowest
available position so that the rack does not become unstable.
v If you are installing more than one EXP100 in the rack, start at the lowest
available position, and work upward.
v If appropriate, allow for possible later installation of other units.
v If necessary, remove the rack power distribution unit before you install the
support rails.
v For procedures and more information, refer to the installation and service
guide, or equivalent, for the rack.
Pins to remove
None
1 and 3
All
Chapter 2. Installing the EXP100
35