Field Notice: FN - 70033 - Power Supply Might Not Report "Removal Alarm" When One of the Feeds is Removed in NCS4200 and ASR900 Chassis - Hardware Upgrade Available

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Updated:July 23, 2019
Document ID:FN70033

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Notice

THIS FIELD NOTICE IS PROVIDED ON AN "AS IS" BASIS AND DOES NOT IMPLY ANY KIND OF GUARANTEE OR WARRANTY, INCLUDING THE WARRANTY OF MERCHANTABILITY. YOUR USE OF THE INFORMATION ON THE FIELD NOTICE OR MATERIALS LINKED FROM THE FIELD NOTICE IS AT YOUR OWN RISK. CISCO RESERVES THE RIGHT TO CHANGE OR UPDATE THIS FIELD NOTICE AT ANY TIME.

Revision History

Revision Publish Date Comments
1.0
10-Oct-17
Initial Release
2.0
23-Jul-19
Removed the Upgrade Program section.

Products Affected

Affected Product ID Comments
A900-PWR900-D2
A900-PWR900-D2=

Defect Information

Defect ID Headline
CSCvg06243 A900-PWR900-D2 PSU Input Voltage Feed Reporting Issue

Problem Description

The A900-PWR900-D2 power supply unit (PSU) fails to report an alarm when the secondary feed fails, which is due to an open breaker on this feed.

Background

Cisco has discovered a bug in one of the A900-PWR900-D2 PSUs used in NCS4200 and ASR900 chassis. Due to this bug, the PSU does not report an alarm when the secondary feed is removed from the system.

Problem Symptom

The 900W DC PSU has dual feeds, A and B, that use a breaker system.

In the process of using dual feeds, a failure is not reported if the breaker opens up for the secondary feed. It also shows a voltage close to the primary feed, which is due to leakage voltage from the primary feed to the secondary feed.

Note: This is not a safety hazard.

Workaround/Solution

Cisco recommends that the PSU with version -01 be replaced with the fixed version -02.

How To Identify Affected Products

Hardware

A PSU with version V01 can be identified by the sticker placed on the unit.

CLI

The PSU version number can be identified with the show inventory command, which lists all the Product IDs (PIDs) installed in the chassis. For the PSU, the output will be displayed as shown in this example:

NAME: "Power Supply Module 0", DESCR: "ASR900/NCS4200 900W DC Power Supply"

PID: A900-PWR900-D2    , VID: V01  , SN: LXXXXXXXXXX

Note: VID : V01 indicates that it is an affected PSU.

For More Information

If you require further assistance, or if you have any further questions regarding this field notice, please contact the Cisco Systems Technical Assistance Center (TAC) by one of the following methods:

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