Each modular configuration DC power shelf supports up to eight DC PMs. The power shelves and DC PMs
are field replaceable.
Although each modular configuration DC power shelf can support up to eight DC PMs, the modular
configuration DC power shelf is shipped with six DC PMs per shelf.
Note
This figure shows the cable wiring for the modular configuration power shelf.
Figure 15: DC Power Shelf Cable Wiring for Modular Configuration Power Shelf
Each power shelf operates with up to eight DC inputs of –48/–60 VDC (nominal), 60A. The power shelf
accepts input DC power in the range –40 to –72 VDC.
This table lists the modular configuration DC input current and voltage specifications.
Table 3: DC Input Current and Voltage Information
–48 VDC North America–60 VDC European Community(range: –40 VDC to –72
VDC)
Nominal input voltage
50 A maximum at –48 VDC40 A maximum at –60 VDC60 A maximum at –40 VDC
Input line current
Each wiring block on the modular configuration DC power shelf contains two sets of terminals, one positive
and one negative, and is covered by a plastic terminal block cover that is secured by a screw to a torque of 5
to 7 in.-lb (0.56 to 0.79 N-m). Each DC power cable is connected to the power shelf with a torque of 20 in.-lb
(2.26 N-m). Maximum wire size at the DC input terminal block is 2 AWG.
Cisco CRS Routers 16-Slot Line Card Chassis Installation Guide
24
Installing and Removing Power Components
Modular Configuration DC Power
