Sun Microsystems StorageTek 6140 Array, Release Notes

Page: 50 / 68

42 Sun StorageTek 6140 Array Release Notes • November 2008
Note – Power for the optional –48-VDC power configuration is supplied by a
centralized DC power plant instead of the AC power source in the cabinet. Refer to
the associated manufacturer’s documentation for specific DC power source
requirements.
Consider the following information when preparing the array’s installation site:
■
Protective ground – Site wiring must include a protective ground connection to
the AC power source or the optional –48-VDC power source.
Note –
Protective ground is also known as safety ground or chassis ground.
■
Circuit overloading
Power circuits and associated circuit breakers must provide sufficient power and
overload protection. To prevent possible damage to the array, isolate their power
source from large switching loads (such as air- conditioning motors, elevator
motors, and factory loads).
■
Interruptions:
■
Input transient – 50 percent of the nominal voltage
■
Duration – One-half cycle
■
Frequency – Once every 10 seconds
■
Power failures – If a total power failure occurs, the array automatically performs
a power-on recovery sequence without operator intervention after power is
restored.
DC Power Input
The DC power source must provide the correct voltage, current, and frequency
specified on the array nameplate label and the serial number label.
The DC power limits within which the Sun StorageTek 6140 array can run without
interruption include the following:
■
Nominal voltage
■
Low range: –36 VDC
■
High range: –72 VDC
■
Operating current: 15.8 A maximum