RAID Array 3000 Storage Subsystem
1–8
EK–SMCPO–UG. A01
1.4.5 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 fol-
lowing external components on the rear panel of the pedestal are part of the
EMU (see 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
Figure 1–4 EMU Circuit Board Location
3000-37
E M U
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