Power supply faulty

Asset ID:	1-72-2175979.1
Update Date:	2018-02-19
Keywords:

Solution Type Problem Resolution Sure

Solution 2175979.1 : Power supply faulty

Applies to:

Sun Fire E25K Server - Version Not Applicable and later
Sun Fire E20K Server - Version Not Applicable and later
Sun Fire 15K Server - Version Not Applicable and later
Sun Fire 12K Server - Version Not Applicable and later
Information in this document applies to any platform.

Symptoms

All power supplies are having the status "On" in showboards -v output

showboards -v
...
PS0 On PS-A196 - - -
PS1 On PS-A196 - - -
PS2 On PS-A196 - - -
PS3 On PS-A196 - - -
PS4 On PS-A196 - - -
PS5 On PS-A196 - - -

But in showenvironment output we see DC0 voltage Fail

showenvironment
...
POWER UNIT AC0 AC1 DC0 DC1 FAN0 FAN1
----- ---- --- --- --- --- ---- ----
PS-A196 at PS0 OK OK OK ON ON OK OK
PS-A196 at PS1 OK OK FAIL ON ON OK OK
PS-A196 at PS2 OK OK OK ON ON OK OK
PS-A196 at PS3 OK OK OK ON ON OK OK
PS-A196 at PS4 OK OK OK ON ON OK OK
PS-A196 at PS5 OK OK OK ON ON OK OK

Cause

There is no current at DC1 of the PSU (current1 is 0.00 Ampere) which is most likely related to the power source or the AC circuit breaker of the power supply is switched off.

Note:
There are 2 breakers on each power supply AC0 for DC0 and AC1 for DC1

POWER VALUE UNIT STATUS
--------- ----- ---- ------
PS-A196 at PS0
Current0 20.32 A N/A
Current1 19.12 A N/A
48VDC 48.21 V N/A
Power 1901.40 W N/A
PS-A196 at PS1
Current0 37.45 A N/A
Current1 0.00 A N/A
48VDC 49.00 V N/A
Power 1835.05 W N/A

Solution

As the PSU is shown as on but has no power on AC1 the issue maybe on the Powersource/-switch for the suspect PSU and not the PSU itself.
It could also be a related to a Sc which is in an inconsistent status ( which can likely b the case when the SC has a long uptime) and therefore reporting falsely.

Do the following steps to solve the issue:

1) An electrician should confirm the proper operation of the AC power cord feed

2) Check if the powercord is no more properly connected or has been removed from the PSU or powerplug

3) Check the status of the LEDs on the PSU which are:

-AC present
-Fault
-OK to remove

3) Check if AC0 & AC1 breakers are on

4) If no fault was found in the steps above then swap power cord of the suspect PSU with one of a different PSU (e.g. swap cable PS#1with PS#3)

If the fault still exists reboot SC
1) Reset the Spare-SC by running "resetsc" on the Main-SC

2) Wait some minutes and check that the Spare-SC is up again and failover is active

Check for following line in the "showfailover -v" output:

SC Failover Status: ACTIVE

3) Force a failover which will change Spare-SC to Main-SC and reset the former Main-SC with "setfailover force"

4) Upload explorer of new MainSC

5) Check in showenvironment output if the Power status is now OK
If it still "Fail" replace PSU

in this case the solution was: customer powered on Power Supply Switch to PS1

If it is not too long ago when the switch was tripped you may find a message like

PS-A196 at PS1 breaker has been tripped: ecode = 0

in the platform messages

(check also the *.remote messages

References

<NOTE:1006233.1> - Sun Fire[TM] 12K/15K/20K/25K: Interpreting System Management Services(SMS) Failed Power Supply Messages
https://docs.oracle.com/cd/E19065-01/servers.e25k/820-0061-11/820-0061-11.pdf
https://support.oracle.com/handbook_partner/Devices/DC_Power/DCPOWER_Artesyn_1705_4000W.html

Attachments

This solution has no attachment