Sun Microsystems StorageTek 6140 Array, Руководство пользователя

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Chapter B Using DC Power 45
Connecting Power Cables
To use the DC power option (–48-VDC) to power the array module, review the
following points.
■
Ensure that you use a separate power source for each optional DC power
connector on the array module. Connecting to independent power sources
maintains power redundancy.
■
It is not mandatory that the second DC power connection on each of the array
module’s DC power-fan CRUs be connected. The second DC power connection
is for additional redundancy only and may be connected to a second DC power
bus.
Caution –
A qualified service person is required to make the DC power
connection per NEC and CEC guidelines. A two-pole 20-amp circuit breaker is
required between the DC power source and the array module for over-current and
short-circuit protection. Before turning off any power switches on a DC-powered
module, you must disconnect the two-pole 20-amp circuit breaker.
Caution – Ensure that you do not turn on power to the array module or the
connected drive modules until this guide instructs you to do so. For the proper
procedure for turning on the power, see “
“Connecting Power Cables” on page 45 .”
Caution –
Electrical grounding hazard – This equipment is designed to permit the
connection of the D.C. supply circuit to the earthing conductor at the equipment.
▼
Connecting the Cables
1. Disconnect the two-pole 20-amp DC circuit breaker for the storage array.
2. Ensure that all DC power switches on the DC-powered array module and all
DC power switches on any connected, DC-powered drive modules are turned
off.
3. Connect the DC power connector cable to the DC power connector on the back
of the array module.
Caution –
The three source wires on the DC power connector cable (–48 VDC)
connect the array module to centralized DC power plant equipment, typically
through a bus bar located above the cabinet.