Replicing the Controller of Fujitsu Eternus 3000 Model 50 ....

Hi.everyone...

Fujitsu Eternus 3000 Model 50 is running in our company.
two controller units are installed.

One controller unit is failed. I purchased new controller unit but
don't know how to replace the controller unit

1) It's possible that the controller unit is replaced in online ?
2) After replacement, configuration synchronizaion between new
controller and existing controller is started automatically ?

Please let me know how to replace the controller unit....

Thank you.