Dell UPS 5600R - Manual (Page 18)

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Installation
Pull the battery trays out using the plastic tabs and remove the battery trays (see Figure 8).
Figure 8. Removing the Battery Trays
2 If installing additional UPSs, repeat Step 1 for each cabinet.
NOTE: The following instructions are the same for square-hole racks and unthreaded, round-hole racks. The
rails fit both rack styles. The square-hole rack is shown in the illustrations.
3 Select the proper holes in the rail for positioning the cabinet in the desired location in the rack.
Locate the rails at the bottom of the 4U space allocated for the UPS (3U for the EBM).
4 Position the end of the left and right rails labeled FRONT facing inward.