Quantum Scalar i500 User Manual page 201

a. If you are adding a module above a previously racked 9U module, count nine full units from the
location of the 9U expansion module's rack ears, and prepare to install the nut clip (or cage nut)
to that location on the rack.
For example, if the 9U expansion module's rack ears are located at 1U and 2U, then the nut
clips (or cage nuts) should be installed at 10U and 11U.
Next, determine which holes you must use within the 10U and 11U markers. Notice that each
rack unit (U), as delineated by the alignment markers in the rack, contains three mounting
holes. If you are adding a module anywhere above the control module, position the nut clip (or
cage nut) at the middle hole in that unit. If you are adding a module anywhere below the control
module, position the nut clip (or cage nut) at the upper hole in that unit.
b. If you are adding a module directly above a previously racked control module, count five full
units from the location of the control module's rack ears, and prepare to install the nut clip (or
cage nut) to that location on the rack.
For example, if the control module's rack ears are located at 1U and 2U, then the nut clips (or
cage nuts) should be installed at 6U and 7U.
Next, determine which holes you must use within the 6U and 7U markers. Notice that each rack
unit, as delineated by the alignment markers in the rack, contains three mounting holes. If you
are adding a module anywhere above the control module, position the nut clip (or cage nut) at
the middle hole in that unit. If you are adding a module anywhere below the control module,
position the nut clip (or cage nut) at the upper hole in that unit.
2 Install the nut clips (or cage nuts) to the desired location in the rack.
Installing nut clips:
a. Hold the nut clip so that its semi-circle design faces outside the rack.
b. Push the nut clip onto the rack's mounting holes so that the nut is behind the rack's holes. (After
the nut clip is installed, you can slide it up and down the mounting holes, if necessary.)
Installing cage nuts:
a. Hold the cage nut so that its hinges face outside the rack, and so that its hinges clasp the upper
and lower portions of the square hole.
b. Place the cage nut in the desired hole. Insert one hinge in the hole first, then pinch the cage nut
and push it into the hole until it snaps into place. (You may want to use a screwdriver to help
push the hinge into the hole.)
3 Prepare the module to be stacked in the rack.
a. Power off the module and disconnect all power cords, network data cables, and module-to-
module cables.
b. Consider removing all tape drives from the module. Modules are much easier to lift into the rack
without the additional weight of the tape drives.
Scalar i500 User's Guide 189