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Cisco CRS-1 Carrier Routing System 8-Slot Line Card Chassis Installation Guide
OL-6256-08
Chapter 2 Installing and Removing Power Components
Information About Installing and Removing the Power Components
AC Power Systems
An AC-powered Cisco CRS-1 8-slot line card chassis contains two AC power distribution units (PDUs)
and two AC rectifier modules. Each AC PDU is connected to a 3-phase (200 to 240) input VAC power
source and connects to a single 7500-watt AC rectifier module that is field replaceable. Each AC rectifier
module converts input AC power to the 54.5 VDC used by the Cisco CRS-1 8-slot line card chassis. Each
rectifier has its own circuit breaker.
To provide 2N power redundancy for the Cisco CRS-1 8-slot line card chassis, each PDU and AC
rectifier pair is connected to a different AC power source. During normal operation when both power
sources are operational, both PDUs and rectifiers function together to power the chassis. However, if a
power sources fails, the other power source provides the other PDU and rectifier pair with enough input
power to power the chassis. This 2N power redundancy enables the routing system to operate despite the
power failure.
Two versions of the AC PDU are available to accommodate AC input power in either the Delta or Wye
configuration. Each PDU has a different Cisco part number. The PDUs are shipped with AC power cords
that are 14 feet (4.3 m) long.
The AC PDUs have the following input VAC power requirements:
• AC Wye input: 3-phase, 200 to 240 VAC nominal (phase-to-neutral), 50 to 60 Hz,
16
A (International) or 20 A (North America). The PDU is rated for 14-amp service, and accepts AC
input of 16 or 20
A.
The Wye power cord has a 5-pin IEC 60309 plug that is rated for 400 VAC, 16 or 20 A, (3W + N +
PE). The power cord plugs into a similarly rated IEC 60309 receptacle.
• AC Delta input: 3-phase, 200 to 240 VAC nominal (phase-to-phase), 50 to 60 Hz, 30 A. The PDU is
rated for 24-amp service, and accepts AC input of 30
A.
The Delta power cord has a 4-pin NEMA L15-30P plug that is rated for 250 VAC, 30 A (3W + PE).
The
power cord plugs into a similarly rated NEMA L15-30R locking-type receptacle.
For additional power details, see Appendix A, “CRS-1 8-Slot Line Card Chassis Specifications,” or
Cisco CRS-1 Carrier Routing System 8-Slot Line Card Chassis System Description.
Before Powering the Chassis Up or Down
While the line card chassis does not have a single power switch that powers the entire chassis and all its
components up and down, the AC rectifier or DC PEM linkage cuts power to the chassis as a whole when
both power components are turned off. Most components on the chassis, such as the power modules,
MSCs, PLIMs, and fan trays can be removed or installed in the chassis while it is running.
Before you can power the chassis up, you must do the following:
Step 1 Install the PDUs (see the “Installing a PDU” section on page 2-10).
Step 2 Install the power modules (see the “Installing a Power Module” section on page 2-13).
Step 3 Install the route processor (RP) card (see the “Installing an RP or DRP Card” section on page 4-38).
Step 4 Activate your power source.
Step 5 Turn the power module switches to the on position.