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Cisco CRS-1 Carrier Routing System 16-Slot Multishelf System Site Planning Guide
OL-7422-04
Chapter 2 16-Slot Fabric Card Chassis Installation Site Requirements
Fabric Card Chassis Power System Requirements
Figure 2-2 DC Power Shelf Wiring
Note When wiring the power shelf, be sure to attach the ground wire first. When removing the wiring, be sure
to remove the ground wire last.
AC Power Requirements
The fabric card chassis AC power system can deliver up to 10000 watts (10 kW) of output power for
chassis components. Each AC-powered chassis requires two AC power shelves for 2N redundancy. The
power shelves contain the input power connectors. Each power shelf holds three AC-to-DC rectifiers
that are field replaceable. The rectifiers convert the input 200-to-240 VAC power to 54.5 VDC used by
the chassis.
The AC-to-DC rectifiers used in the fabric and line card chassis are identical, but they are programmed
to provide the different power requirements for each type of chassis. Each power shelf and rectifier has
its own circuit breaker. For additional power system details, see Cisco CRS-1 Carrier Routing System
Multishelf System Description.
Two versions of the AC power shelf are available for AC input power in either the Delta or Wye
configuration. Each power shelf has a different Cisco part number to distinguish it from the other. All chassis
have two power shelves of the same type; that is, two Delta or two Wye power shelves.
• The AC Wye power shelf has a Wye 3-phase, 5-wire connection: 200 to 240 (L-N)/346 to 415 (L-L)
VAC, 3W+N+PE, 50 to 60 Hz, 24 A. For redundant operation, two 3-phase Wye 32-A branch
circuits are required. One power connection is required for each power shelf.
• The AC Delta power shelf has a Delta 3-phase, 4-wire connection: 200 to 240 VAC, 3-phase,
3W+PE, 50 to 60 Hz, 32 A. For redundant operation, two 3-phase Delta 60-A branch circuits are
required. One power connection is required for each power shelf.
Table 2-2 DC Input Current and Voltage Information
Nominal input voltage –48 or 60 VDC (range: –42 to –75 VDC)
Input line current 55 A maximum at –42 VDC (low voltage extreme)
46 A maximum at –48 VDC
37 A maximum at –60 VDC
Inrush current 168 A peak at 75 VDC
(maximum for 1 ms)
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