Chapter 2 Power and Cooling
AC Power Requirements
Caution Although reverse polarity should not damage the DC power system, you should correct a reverse polarity condition immediately.
AC Power Requirements
An AC-powered line card chassis contains two AC power distribution units (PDUs) and two AC rectifier modules. Each AC PDU is connected to an input AC power source and holds a single 7500-watt AC rectifier. Input AC power enters the PDU and is passed to the rectifier. Here, the input AC power is converted into the 54.5 VDC used to power components in the chassis. Each AC rectifier is field replaceable and has its own circuit breaker.
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, and ships with an AC power cord that is 14 feet (4.3 m) long.
In addition to the requirements in the “General Power and Grounding Requirements” section on page 2-2, AC input power requirements are as follows:
•An AC-powered chassis (Wye or Delta) requires 8,750 watts of AC input power.
•Two separate and independent AC power sources are required, one for each PDU. Each PDU should be connected to a different power source to provide 2N power redundancy in case a power source fails.
•Each AC power source must provide 3-phase VAC power, and have its own circuit breaker.
•AC Delta input:
–3-phase, 200 to 240 VAC (phase-to-phase), 50 to 60 Hz.
–Input current: 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 (3 wire + protective earthing1 [3W+PE]). The power cord is rated for 250 VAC, 30 A, and plugs into a similarly rated NEMA L15-30R locking-type receptacle.
•AC Wye input:
–3-phase, 200 to 240 VAC (phase-to-neutral), 50 to 60 Hz.
–Input current: 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 (3 wire + neutral + protective earthing conductor (ground wire) [3W+N+PE]). The cord is rated for 400 VAC, 16 or 20 A, and plugs into a similarly rated IEC 60309 receptacle.
•A grounding-type AC power outlet is required. The PDUs are shipped with AC power cords that have a grounding-type plug. As a safety feature, the plugs fit only a grounding-type AC power outlet.
Cisco CRS-1 Carrier Routing System 8-Slot Line Card Chassis Site Planning Guide
