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[MX] Major alarm 'Wrong Input Feed Selection for PSM'



Article ID: KB36047 KB Last Updated: 16 Jul 2020Version: 1.0

This article explains the meaning of the 'Wrong Input Feed Selection for PSM' alarm and how to resolve it.


Syslog message:

Apr  6 18:39:11  craftd[15743]: %DAEMON-4: Major alarm set, Wrong Input Feed Selection for PSM 8​
Apr  6 18:39:11  send: red alarm set, device PSM 8, reason Wrong Input Feed Selection for PSM 8​

Active Alarm:

user@host> show chassis alarms               
Apr 11 21:31:06
1 alarms currently active
Alarm time               Class  Description
2020-04-06 18:39:11 UTC  Major  Wrong Input Feed Selection for PSM 8

  1. Incorrect feed selection for PSM
  2. Issue with PSM
  3. Issue with feeds
  4. An issue with PSM slot

Verify PSM environment status:

user@host> show chassis environment psm 8 

PSM 8 status:
  State                      Online
  Temperature                OK                                     
  AC Input                   Feed       Voltage(V)  Current(A) Power(W)
                             INP0         237.50      3.40      807.50
                             INP1         240.00      0.00      0.00  
  DC Output                  Voltage(V) Current(A)  Power(W)   Load(%)
                               52.00      12.50      650.00     26.00
  Hours Used                 122

The above is an ideal output to verify the correct status of PSM. ​Sometimes, the PSM status could be present. In that case, we might have to reseat the PSM.

PSM Read Status:

Verify the status as per each criterion.

user@host> test chassis psm read status slot 8

OVP (Over Voltage)             : 0
Short pin disengage            : 0
OTP (Over Temperature)         : 0
FAN failure                    : 0
Output ORing FET failure       : 0
INP0 AC voltage out-of-range   : 0
UVP (Under Voltage)            : 0
OCP (Over Current)             : 0
Clear Share Fail alarm over I2C: 0
Supply OFF over I2C            : 0
Fan speed set to max over I2C  : 0
Fan speed set to min over I2C  : 0
ORing failure detect over I2C  : 0
ATS position                   : 0
LED Test over I2C              : 0
5VDC OFF over I2C              : 0
5VDC voltage out-of-range      : 0
5VDC OCP (Over Current)        : 0
N/A                            : 0
PFC bus voltage out-of-range   : 0
N/A                            : 0
Eeprom Write Enable            : 0
INP1 present                   : 1
INP0 present                   : 1
Supply Shutdown                : 0
N/A                            : 0
N/A                            : 0
Active INP at the time         : 0
INP1 AC voltage out-of-range   : 0
Active current share fail      : 0
5VDC Shutdown                  : 0
LED Test in progress           : 0
Supply Firmware Ready          : 1
Supply switched OFF            : 0
INP1 AC voltage Too-High       : 0
INP1 AC voltage Too-Low        : 0
INP1 AC voltage Too-Too-Low    : 0
INP0 AC voltage Too-High       : 0
INP0 AC voltage Too-Low        : 0
INP0 AC voltage Too-Too-Low    : 0
Eeprom Write Enable mask       : 1
N/A                            : 0
INP1 Circuit failure           : 0  
INP0 Circuit failure           : 0  
Pri & Sec MCU comm lost        : 0
52VDC current SHARE is OFF     : 0
5VDC output is OFF             : 0
52VDC output is OFF            : 0
Clear Share Fail alarm mask    : 1
Supply OFF mask                : 1
Fan speed set to max mask      : 1
Fan speed set to min mask      : 1
ORing failure detect mask      : 1
Input Feed Selected            : 1
LED Test mask                  : 1
5VDC OFF mask                  : 1

The above output does not display a discrepancy in the output. 

Verify LED status on the FPM:

Verify the LED status of the troublesome PSM on the craft interface. The LED status RED indicates a possible hardware failure.

Verify the feeds:

Verify if the feeds are intact and are properly plugged. Also, check for any issues with the feed and replace them to check if needed. 

Verify the circuit breaker:

Refer to Check the Circuit Breaker for a brief idea about the circuit breaker checks to be performed.

Verify DIP switch settings on the PSM:

For both AC and DC PSM, the following settings hold true:

Left Switch Right Switch Input Source
Off Off None 
On Off Input 0
Off On Input 1
On  On Both Input 0 and Input1

If the setting below is not true as per the device, change the switches to adjust to the input source and switch matching as per the above table. The input expected should match the switch settings. The feeds are set by the input mode DIP switch located on the PSM. Move the input mode DIP switch to the on or off position to determine the power supply feeds.

If all the above conditions are properly maintained, please perform the below in a maintenance window:

  1. Remove PSM from the chassis.
  2. Change the DIP switch setting to have only Input 0 or Input 1( On-Off / Off-On ) expected.
  3. Plugin PSM back into the chassis.
  4. Now change the DIP switch to have both feeds expected.
The alarm should ideally disappear. If not, this could be an issue with the PSM. Please contact JTAC for further analysis.
Logs to be collected in addition to the above details:
  • >show log chassisd
  • >show log messages
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