In addition to what is mentioned, I suggest avoiding the removal or installation of a HIM on a Powerflex while the drive power supply is active, only while powered down fully, and you can (with a lot of patience) name the individual saved files uniquely to save multiple drive settings to a single HIM. If you must remove the HIM under power, there is a key sequence to follow to avoid a fault, and if you have to install one in a powered drive, just do it with a nice firm snap all at once or it is liable to freeze up.