HP R1500 - UPS XR User Manual page 61

Install the mounting ears on the chassis using the screws provided.
3.
With one person on each side, lift the chassis to rail level and slide the chassis on the mounting rails.
4.
Attach the chassis to the rack using the supplied screws.
5.
If using the rear mounting brackets, be sure that the bracket tabs are fully inserted into the rear panel
6.
cutouts, then tighten the brackets.
The UPS auto-detects ERM installation by updating the system runtime. If the system runtime is not updated,
verify installation or see "Troubleshooting (on page 94)" .
ERM installation 61