12
Site Preparation Guide • August 2011
DC Power Connector Cables
Each –48-VDC power connector cable plugs into the DC power connector on the
back of the controller tray. The three source wires on the other end of the power
connector cable connect the tray to centralized DC power plant equipment, typically
through a bus bar above the cabinet.
Caution –
A qualified service person is required to make this DC power connection
according to NEC and CEC guidelines.
Caution –
Risk of electrical shock—This unit has more than one power source. To
remove all power from the unit, all DC MAINS must be disconnected by removing
all power connectors from the power supplies.
Two (optionally four) DC power connector cables are provided with each controller
or expansion tray. Two DC power connectors are on the back of each tray’s DC
power supply if additional redundancy is required.
Note –
It is not mandatory that the second DC power connection on the array’s DC
power supplies be connected. The second DC power connection is provided for
additional redundancy only and may be connected to a second DC power bus.
Battery Life
For a fully rated battery backup unit (BBU) battery life, cell limitations are listed in
TABLE 2-12
Battery Life Specifications
Operating
50˚F to 95˚F (10˚C to 35˚C)
Storage
(up to three months)
14˚F to 113˚F (-10˚C to 45˚C)
Transit
(up to seven days)
-4˚F to 140˚F (-20˚C to 60˚C)