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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
Cable accessory packages for the AC power shelves contain AC power cables for the power shelves.
The power cables, which are 13 feet (4 meters) long, are not shipped preattached to the power shelves.
• The Wye power cord has a 5-pin 532P6W plug (3 wire + neutral + protective earthing
1
[3W+N+PE]). The power cord is rated for 415 VAC, 40 A (North America) or 32 A (International),
and plugs into a similarly rated 532R6W power receptacle. (See Figure 2-3.)
• The Delta power cord has a 4-pin 460P9W plug (3 wire + protective earthing
1
[3W+PE]). The power
cord is rated for 250 VAC, 60 A, and plugs into a 460R9W power receptacle. (See Figure 2-4.)
Figure 2-3 AC Wye Power Cord Plug
Figure 2-4 AC Delta Power Cord Plug
AC Power Shelf Wiring
The fabric card chassis can be ordered with AC power shelves in either the Delta or Wye configuration.
Both types of power supply modules require 3-phase, 220-to-240 VAC input power.
• The AC Delta configuration is typically used in the United States, Japan, and other countries where
the phase-to-phase voltage is approximately 208 VAC. The power supplies are wired between the
phases (see Figure 2-5) and a neutral is not required.
• The AC Wye configuration is typically used in Europe and countries where each phase-to-neutral
voltage is approximately 220 VAC. The power supplies are wired between each phase and neutral
(see Figure 2-6).
AC Delta Power Shelf Wiring
Figure 2-5 shows the wiring for the AC Delta power shelf. As shown, Delta has four wires (three phases
and a safety ground) wired into a terminal board (TB1) on the power shelf. The power supplies are wired
between the phases; therefore, a neutral is not required.
AC input power is routed through a circuit breaker (CB1) to the three 4.4-kW AC rectifiers (PS0, PS1,
and PS2), where it is converted into DC power and routed to load zones in the fabric card chassis:
• PS0 provides 54.5 VDC, 40-A output to load zones 1 and 3.
1. Protective earthing conductor (ground wire).
116877
To AC outlet
116876
To AC outlet