HP A3550A Battery Backup Unit Installation Guide (20-slot)

Hewlett-Packard Battery Backup Unit (BBU)

Installation Guide (20-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 20-slot disk arrays are shown in Figure 1.

.

Figure 1.

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

o

as the step is completed.

Step 1:

Observe antistatic precautions

A BBU is shipped with an ESD kit containing:

–

ESD wrist strap

–

ESD conductive sheet

o

Ground the ESD wrist strap to any unplated metal on

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

Step 2:

Prepare to install the BBU

o

Remove the new BBU from its shipping carton and

place it on a suitable antistatic surface or the ESD

conductive sheet.

o

Open the fan pack by sliding the LOCK/UNLOCK switch

to the UNLOCK position and carefully swinging the fan

pack open.

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

The installation or replacement

MUST

be completed and the

fan pack closed within two minutes to avoid a thermal shut-

down.

Step 3: Install the BBU

o

Locate the slot where the BBU is to be installed (Figure

1) and remove the failed BBU or the BBU filler panel if

present (Figure 2). To remove the BBU, slide the black

latches toward the center of the unit and extract the

BBU.

o

Install the BBU as shown in Figure 2.

o

Push the BBU into the disk array chassis until the

latches on the BBU lock and audible clicks are heard.

When the latches are locked, the BBU cannot be pulled

out again without using the latches.

BBU

20-slot deskside and rackmount disk arrays (rear view)

(shown with fan packs removed for clarity)