Turning Off The Dc Power During An Emergency; Relocation Cautions - Sun Microsystems StorageTek 6140 Array Release Notes

Note – 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.
4. 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 DC-powered modules for over-current and
short-circuit protection. Connect the DC power source wires on the other end of
the DC power connector cable to the centralized DC power plant equipment as
follows (see
a. Connect the brown –48-VDC supply wire to the negative terminal.
b. Connect the blue return wire to the positive terminal.
c. Connect the green/yellow ground wire to the ground terminal.
5. If applicable, connect a DC power cable to each DC-powered drive module in
the storage array.

Turning Off the DC Power During an Emergency

Caution – Potential loss of data – An emergency shutdown of the storage array
might not allow the server to complete its I/O to the storage array.
Note – Trays in storage arrays can be connected to either the standard AC power
supply or the optional DC power supply (–48 VDC).
Note – Before turning off the power switches on a DC-powered tray you must
disconnect the two-pole 20-amp circuit breaker.

Relocation Cautions

Use the following guidelines when relocating trays or drives from one storage array
to another.
46 Sun StorageTek 6140 Array Release Notes • November 2008
"DC Power Connector Cable and Source Wires" on page 41).