HP A3550A - High Availability Disk Arrays Model 20 Storage... User manual

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Hewlett-Packard Battery Backup Unit (BBU)

Installation Guide (10 and 30-slot Disk Arrays)

Hewlett-Packard BBUs are customer installable and replaceable. Areplacement 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.

.

Figure 1.

Install or replace a BBU by performing the following steps. Place a check in the appropriate oas the step is completed.

Step 1: Observe antistatic precautions

ABBU is shipped with an ESD kit containing:

–ESDwriststrap

– ESDconductive sheet

oGround the ESDwrist strap to any unplated metal on

the disk arraychassis 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.

Step 2: Prepare to install the BBU

oRemove the new BBU from its shipping carton and

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

ductive sheet.

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

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

other.

oIf 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 BBUcan be installed or replaced with arraypower on.

For the 30-slot array, the installation or replacement MUST

be completed and the fan pack closed within two minutes to

avoid a thermal shutdown.

Battery

backup unit

(BBU)

disk-drive

modules

Front view of 10-slot

deskside disk array

(front bezel removed for clarity)

Battery

backup unit

(BBU)

Front view of 10-slot

rackmount disk array

(front bezel removed for clarity)

SP-A SP-B

BBU

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

(fan pack not shown for clarity)

Step 3: Install the BBU

oLocate 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.

oInstall the BBU as shown in Figure 2.

oPush 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.

oIf installing a BBU in a 10-slot disk array, install the

front bezel on the ballstuds.

oIf installing a BBU in a 30-slot disk array, close the fan

pack bycarefully swinging the fan pack up and firmly

pressing it onto the latch until an audible click is heard.

When the fan pack is properly latched, it cannot be

opened without using the release button.

For more information on BBU installation procedures and

recharge times, see the disk array user guide.

Figure 2.

deskside 10-slot disk array rackmount 10-slot disk array 30-slot disk array, rackmount only

(fan pack not shown for clarity)

Manual Part Number

A3661-90003 E0897 Copyright © 1997

Hewlett-Packard Company

*PA3661-96003*

A3661-96003