Field Notice: FN - 72571 - NC55-PWR-3KW-AC Displays Error Message during Install Upgrade or OIR Process - Software Upgrade Recommended

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	30-May-23	Initial Release

Products Affected

Affected Product ID	Comments
NC55-PWR-3KW-AC
NC55-PWR-3KW-AC=	Part Alternate

Defect Information

Defect ID	Headline
CSCvz99098	NCS5500: NC55-PWR-3KW-AC PEM goes to failure on OIR

Problem Description

The power supply unit (PSU) NC55-PWR-3KW-AC might display error messages, as shown in the Problem Symptom section. The PSU will enter into a failed state with an output disabled alarm during Online Insertion or Removal (OIR) or the installation process.

Background

This issue was identified during the manufacturing test process and necessary changes have been completed in order to address the problem.

This issue does not qualify for a system hardware replacement. There is a software fix available, described in the Workaround/Solution section, to address the problem.

Problem Symptom

The PSU might show these error messages which help to identify the issue:

• The admin show environment power command shows that the PSU is in the failed or no power state.

  sysadmin-vm:0_RP1# show environment power location 0/PM7
  DDD MMM  DD HH:MM:SS.936 UTC+00:00
     0/PM7       3kW-AC    326.1/0.0 /0.0  20.9/0.0 /0.0     10.4     89.1    FAILED or NO PWR 

• The show alarms command displays multiple alarms, which includes Power Module Output Disabled.

  sysadmin-vm:0_RP1# show alarms
  DDD MMM  DD HH:MM:SS.936 UTC+00:00
  -------------------------------------------------------------------------------
  Active Alarms
  -------------------------------------------------------------------------------
  Location   Severity   Group     Set time            Description
  -------------------------------------------------------------------------------
  0/FT2      major      environ   10/21/21 10:03:25   Fan tray is removed from chassis.
  0/PM7      major      environ   10/21/21 11:19:11   Power Module Output Disabled.
  0/PM7      major      environ   10/21/21 11:19:17   Power Module Fault (LOGIC_CTRL_VOLT_OOR).
  0/PM7      major      environ   10/21/21 11:19:17   Power Module Fan Fault.

Workaround/Solution

Cisco recommends to install a Software Maintenance Upgrade (SMU) for the respective Cisco IOS^® XR release in order to fix the issue. This is also classified as a mandatory SMU for this PSU to be installed now to avoid this issue being seen in future.

Note: If you are on Cisco IOS XR Release 7.8.1 or later you do not need to install this SMU as the fix is already built into the release.

 

Cisco IOS XR Release	SMU Details	SMU Type
Cisco IOS XR Release 7.7.2	ncs5500-sysadmin-7.7.2.CSCvz99098.tar	Hitless
Cisco IOS XR Release 7.7.1	ncs5500-sysadmin-7.7.1.CSCvz99098.tar	Hitless
Cisco IOS XR Release 7.6.2	ncs5500-sysadmin-7.6.2.CSCvz99098.tar	Hitless
Cisco IOS XR Release 7.6.1	ncs5500-sysadmin-7.6.1.CSCvz99098.tar	Hitless
Cisco IOS XR Release 7.5.3	ncs5500-sysadmin-7.5.3.CSCvz99098.tar	Hitless
Cisco IOS XR Release 7.5.2	ncs5500-sysadmin-7.5.2.CSCvz99098.tar	Reboot
Cisco IOS XR Release 7.4.2	ncs5500-sysadmin-7.4.2.CSCvz99098.tar	Hitless
Cisco IOS XR Release 7.3.2	ncs5500-sysadmin-7.3.2.CSCvz99098.tar	Reboot
Cisco IOS XR Release 7.1.2	ncs5500-sysadmin-7.1.2.CSCvz99098.tar	Hitless
Cisco IOS XR Release 7.0.2	ncs5500-sysadmin-7.0.2.CSCvz99098.tar	Hitless

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:

• Open a service request on Cisco.com
• By email or telephone

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