Compaq StorageWorks UltraSCSI RAID Enclosure (DS-BA370 Series) User's Guide (EK-BA370-UG. C02, September 1998)

Environmental Monitoring Unit

3–14 UltraSCSI RAID Enclosure

• Starts the EMU timer if: (1) all blowers in a shelf bank are

defective, or (2) a blower is removed.

• Approximately eight minutes after the EMU timer begins

operating, the array controllers will shut down and then the EMU

turns O

FF the dc power in the enclosure to prevent continued

overheating and potential equipment damage.

Momentarily depressing the alarm control switch causes the EMU

audible alarm to turn O

FF, but the fault status LEDs remains ON. At

this time, the blower LEDs display system fault codes that are

essential to pinpointing the fault. See the Configuration Fault Code

Reporting section within this chapter.

EMU Status Reporting

The EMU processes subsystem status reports and notifies the user of

problems via an EMU audible alarm and EMU status LEDs. Figure

3–5 identifies the numerous EMU status LEDs.

Figure 3–5 EMU Status LEDs

The EMU processes two types of problems:

•

Error conditions—

involves the failure of a component or

conditions outside the predetermined environment, such as an

overtemperature condition.

If an error condition is detected, the system fault LED

ALLOUT 1) turns ON. For detailed information about other

system fault LED indications, see the Error Condition Reporting

section within this chapter.

Figure C

ALLOUTS

1. System fault LED

2. Alarm control

switch

3. Temperature LED

4. Power LED

5. Blower LEDs

1234

5678

CXO5748B