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1-8 RAID Array 3000 Pedestal Storage Subsystem Hardware User’s Guide
Compaq Confidential – Need to Know Required
Writer: Bob Young Project: RAID Array 3000 Pedestal Storage Subsystem Hardware User’s Guide Comments:
Part Number: EK-SMCPO-UG. C01 File Name: b-ch1 Product Overview.doc Last Saved On: 12/4/00 1:51 PM
The UPS has its own installation, operation, and service manual. The manual
describes the UPS in detail and is part of the documentation set enclosed with
your subsystem.
Environmental Monitor Unit (EMU)
The EMU is an internal circuit board that monitors the operation of the
pedestal. The EMU monitors power supply voltages, fans, temperatures which
are reported to the user, and controls (turns on and off) the audible alarm and
status LED on the front panel. The EMU also reports the subsystem status to
the controller that reports to the host, and has the capability of exchanging
signals with auxiliary devices and controllers.
The EMU is located internally in the top rear of the pedestal as shown in
(Figure 1–4). It is connected to the SCSI bus and powered by an internal cable.
The following external components on the rear panel of the pedestal are part of
the EMU (Figure 1–5):
■ An alarm switch (S1) that enables (up) or disables (down) the audible
alarm
■ A power monitor connector (UPS) allows the EMU to monitor and
report the status of a battery backup power supply
■ An External Fault Condition connector allows the EMU to monitor the
status of a user-selected device
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EMU
Figure 1-4. EMU circuit board location