Ac Shelf Power Switch; Ac Input Voltage Range; Dc Output Levels; Ac System Operation - Cisco ASR 9000 series Reference Manual

Chapter 2 Functional Description
1
DC output power blades
2 IEC input receptacles with retention brackets

AC Shelf Power Switch

Each AC power shelf provides a single-pole, single-throw power switch to power on and off the three
power modules installed in the shelf simultaneously.

AC Input Voltage Range

Each AC module accepts an individual single phase 220-VAC 20-A source. The AC input voltage is
anywhere within the limits specified in

DC Output Levels

The output for each module is within the tolerance defined in
voltage variation, load variation and environmental conditions. The combined, total module output
power does not exceed 3000 W.
The AC shelf output capacity depends on how many modules are populated. Maximum output current is
determined by multiplying the maximum module current times module quantity. For example, to
determine the maximum capacity with 3 power supply modules, multiply the current by three (x3).

AC System Operation

This section describes the normal sequence of events for system AC power up and power down.

Power Up

1.
2.
3.
4.
5.
6.

Power Down

1.
2.
OL-17501-01
D R A F T — C I S C O C O N F I D E N T I A L
AC power is applied to the power shelf by toggling the customer's AC circuit breakers to the ON
position.
AC/DC power supplies are enabled by toggling the Power On/Off logic switch located in each of the
power shelves to the ON position.
AC/DC modules in the power shelves provide –54 VDC output within 2 seconds after the AC is
applied.
The soft-start circuit in the logic cards takes 100 ms to charge the input capacitor of the on-board
DC/DC converters.
The card power controller MCU enables the power sequencing of the DC/DC converters and points
of load (POLs) through direct communication using the PMBus interface to digital controllers.
The output of the DC/DC converters ramps up to regulation within 50 ms maximum after the
program parameters are downloaded to each POL and the On/Off control pin has been asserted.
Power conversion is disabled by toggling the Power On/Off logic switch to the OFF position or
unplugging the power cords from the AC power source.
The AC/DC modules in the power shelves stay within regulation for a minimum of 16 ms after the
AC power is removed.
Cisco ASR 9000 Aggregation Services Router Overview and Reference Guide
3
Power switch
4 I2C cable from backplane
Table A-7. The voltages given are single phase power source.
Table A-9
Power System Functional Description
under all combinations of input
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