HP A3550A - High Availability Disk Arrays Model 20 Storage Enclosure Installation Manual

Hewlett-Packard Battery Backup Unit (BBU)

Installation Guide (10 and 30-slot Disk Arrays)

Hewlett-Packard BBUs are customer installable and replaceable. A replacement BBU must be the same type as the BBU

being replaced.

The locations of the BBUs in the 10-slot and 30-slot disk arrays are shown in Figure 1.

.

Battery

backup unit

(BBU)

Front view of 10-slot

deskside disk array

(front bezel removed for clarity)

Install or replace a BBU by performing the following steps. Place a check in the appropriate

Step 1:

Observe antistatic precautions

A BBU is shipped with an ESD kit containing:

–

ESD wrist strap

–

ESD conductive sheet

Ground the ESD wrist strap to any unplated metal on

the disk array chassis and fasten the strap to your wrist.

On 30-slot disk arrays, ground the ESD wrist strap to

the metal edge above the rear retaining screws.

On 10-slot disk arrays, ground the ESD wrist strap to

the metal edge around the disk modules.

disk-drive

modules

Battery

backup unit

(BBU)

Front view of 10-slot

rackmount disk array

(front bezel removed for clarity)

SP-A

Rear view, top of a 30-slot disk array, rackmount only

Figure 1.

Step 2:

Prepare to install the BBU

Remove the new BBU from its shipping carton and

place it on a suitable antistatic surface or the ESD con-

ductive sheet.

If installing a BBU in a 10-slot disk array, remove the

front bezel by pulling it off on one side and then the

other.

If installing a BBU in a 30-slot disk array, open the fan

pack by pressing the release button and carefully swing-

ing the fan pack open.

The BBU can be installed or replaced with array power on.

For the 30-slot array, the installation or replacement

be completed and the fan pack closed within two minutes to

avoid a thermal shutdown.

(fan pack not shown for clarity)

as the step is completed.

SP-B

BBU