You don't need another PERC, just another computer. The idea is to extract the contents of the payload folder from the download.   To help clarify (sorry if I'm repeating anything you know), here's the process I follow when I want to install an OS and not mess with an LCC.   1st step is going to be driver acquisition. With this being a T320, your PERC is probably an H310, an H710, or a software PERC. With that in mind, you'd grab a laptop/desktp, and go to the T320 page support page ([URL] Change the Category section to "SAS RAID" and the Operating System section to the right version of Windows. Go ahead and download the driver, but you'll run this file on the same system you downloaded it on. Running it will provide you a set of files to put on a USB. Those files are what you need to provide to the Windows installer, it can't directly interact with the .exe.
I am trying to reinstall all the drivers and an OS [Server 2012]  on a decommissioned T 320. I was able to use the delldownload site and create an .iso image. I booted to the image and installed and updated all the drivers and Bios.  But I am unable to install the OS driver pack. It errors out. Do I need the OS driver pack for the OS installation? If so how can I reinstall the OS driver pack? Thanks.
Unable to install OS Driver Pack in T 320