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Maintenance 3-5
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: d-ch3 Maintenance.doc Last Saved On: 12/4/00 1:50 PM
EMU Error Reporting
The primary function of the EMU is to detect and report conditions that can
cause the pedestal to malfunction and to report malfunctions. To accomplish
this, the EMU constantly monitors the following pedestal signals:
■ +5 and +12 VDC
■ AC input
■ Power supply present
■ Total power
■ Power OK (P_OK)
■ Power disabled
■ Fan Speed (minimum and high speed)
■ Fan exhaust temperature
■ Shelf OK (S_OK)
The EMU can exchange signals with auxiliary devices and controllers.
EMU Error Conditions
The EMU reports error conditions and malfunctions using an audible alarm
and an LED. The user-enabled audible alarm and the amber fault LED on the
front of the pedestal are the only error indicators.