5–2 Enclosure 4200 Family LVD Disk Enclosures User Guide
Enclosure Power
The power supply and fan assembly mount in the rear of the enclosure. The supply is
auto-ranging and operates on an AC input voltage of 100 to 240 VAC ±10%, 50 to 60 Hz
± 5% (90 to 264 VAC, 47 to 63 Hz).
There are three DC outputs:
■ +5 VDC for the EMU, I/O module, backplane, and drives
■ +12.3 VDC for the drives.
■ +12.5 VDC for the fans.
The nominal output of each supply is 377W, with a peak output of 425W. Either power
configuration, single or dual, can support an enclosure with a full complement of disks,
fans, EMU, and I/O module.
■ A single power supply, the standard configuration, supports sequential drive spin-up.
■ The Compaq recommended dual power supply configuration can support simultaneous
drive spin-up.
The power supply circuitry provides protection against:
■ Overloads
■ Short circuits
■ Thermal protection against cooling system faults.
Power supply status and diagnostic information is reported to the EMU using the voltage,
current, and temperature signals.
See Appendix B, “Specifications,” for the enclosure power specifications.
Power Options
The enclosure can accommodate one or two power supplies. One power supply is
sufficient to power the enclosure with a full complement of drives.
NOTE: Installing two power supplies, a redundant power configuration, eliminates the
power supply as a single point of enclosure failure. This is the preferred,
high-availability configuration.
