Installing the support rails for the uninterruptible power supply

You must install the support rails in the rack before installing the uninterruptible power supply 2145-1U (2145 UPS-1U) or the uninterruptible power supply 2145 (2145 UPS).

Complete the following prerequisites before installing the support rails:

Refer to the customer's hardware location table to determine where in the rack the UPSs are to be installed.
Discard the two handles and their associated nuts that are shipped with the support rails for the UPS.
At the back of the rack, observe the Electrical Industries Association (EIA) positions, and determine where you are going to install the UPS (see Figure 1). The UPS must always be installed into the lowest available position in the rack. The only device that can be below a UPS is another UPS.
Note: The bottom of the flange of the support rail must align with the EIA mark on the rack.

Figure 1. Installing support rails for a uninterruptible power supply into the rack
- Mounting screws
- Wing nuts
- Wing nut
- Nut clips
- Mounting screws
Attention: In order to tighten wing nuts and , you will need access from above the rails. Ensure that the support rails are installed before anything is installed in the 8 EIA units above the rails. If there are devices already installed in that space, it might be necessary to remove them before installing the rails.

Perform the following steps to install each support rail:

Attach nut clips to the rack. These nut clips must align with the second and fourth holes of the support rail flange.
Loosen wing nuts and .
Slide the bracket toward the back of the rail.
Remain at the back of the rack, hold the support rail in position in the rack, and then install and fully tighten the two mounting screws .
Go to the front of the rack.
Extend the support rail toward the front of the rack.
Note: Hold the support rail in position until you have completed step 8.
Ensure that the support rail is horizontal. You may want to use a level to ensure the support rail is straight.
Install the two mounting screws into the third and fourth holes of the support rail flange. Fully tighten the screws.
Fully tighten the two wing nuts shown as in the figure.
With wing nut still loosened, slide the bracket toward the front of the rail, as far as it will go, with the front edge of the bracket against the back end of the front support rail. Fully tighten the wing nut .