Monitoring Power Supply Operations; Table 4-1 Dc Voltage Ranges - Compaq StorageWorks DS-BA370 Series User Manual

Power Verification and Addressing
4–6 UltraSCSI RAID Enclosure

Monitoring Power Supply Operations

Even with four operational power supplies, it is possible that a power
supply problem might cause one or both of the dc voltages to be too
low. Both the PVA and the EMU monitor power supply operations to
ensure that the dc voltages are within the ranges specified in Table
4–1.
Table 4–1 DC Voltage Ranges
Nominal Voltage
Minimum Voltage
With at least four operational power supplies, the minimum voltage
levels sufficient to run the system are present. Fewer than four
operational power supplies cannot maintain the minimum voltages. If
this occurs, the EMU notifies the array controllers so they can shut
down before standby power mode is initiated.
Some array controllers bypass the standby power mode
functionality from the PVA standby power switch. Refer to
the array controller documentation for availability of this
feature.
The EMU monitors the system dc voltages and I/O module
+5 V dc TERMPOWER. The PVA only monitors the
system dc voltages.
+5 V dc
+4.7 V dc
Caution
Note
+12 V dc
+11.4 V dc