Vide123,     You would need to verify a couple things.  If you got the controller from a reseller or support then you should be good to go. If you're pulling from another MD, or doubt if it has configuration data on it, then you'll need to wipe config on the controller first, otherwise you can get into a lock down db error.   As far as the procedure, you can find that on page 276-277 of the guide here. Let me know if this helps.  
Hi.   We have an issue with RAID Controller 0 on our MD3620i. It has status failed with service action (removal) allowed: yes.   Question: What is the best prosedure for replacing this RAID controller with a refurbished one? Does the replacement RAID controller need to be wiped clean of any settings? In the Recovery Guru procedure it is mentioned that we can release the faulty Raid controller, take it out and wait 1 minute. Then we put the refurbished one back in and configure this as online. What about the existing settings and the storage disks? What is the best prosedure to keep all settings?   Best regards Vidar    
Replacing a faulty Raid controller Powervault MD3620i