Appendix E Using DC Power 131
Caution – The three source wires on the DC power connector cable (–48 VDC)
connect the trays to centralized DC power plant equipment, typically through a bus
bar located above the cabinet.
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 trays 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 “DC Power Connector Cable and Source Wires” on page 128).
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 power-fan assembly on each
DC-powered drive expansion tray 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 – 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.
Caution – Potential data loss – Moving a storage array or array components that are
configured as part of a volume group can result in data loss. To prevent data loss,
always consult a Customer Support representative before relocating configured
drives, controller trays, or drive expansion trays.
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