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NE40E-8 MPU state ordinary but frequently reported the power alarm

Publication Date:  2014-11-06 Views:  54 Downloads:  0
Issue Description

In an NE40E-8,slot 9 MPU frequently reports the power alarm.


Jun 7 2014 17:44:12 NE40E %%01SRM/1/VOLBELOWFATALFAIL(l): SlotID9 address1 channel4 voltage is below fatal threshold.(CurrentVoltage= 0.34V)
Jun 7 2014 17:34:35 NE40E %%01SRM/1/VOLBELOWFATALRESUME(l): SlotID9 address1 channel4 voltage below fatal threshold resumed.(CurrentVoltage= 5.47V)
Jun 7 2014 17:34:34 NE40E %%01SRM/1/VOLBELOWFATALFAIL(l): SlotID9 address1 channel4 voltage is below fatal threshold.(CurrentVoltage= 1.07V)
Jun 7 2014 17:34:01 NE40E %%01SRM/1/VOLBELOWFATALRESUME(l): SlotID9 address1 channel4 voltage below fatal threshold resumed.(CurrentVoltage= 5.50V)
Jun 7 2014 17:33:59 NE40E %%01SRM/1/VOLBELOWFATALFAIL(l): SlotID9 address1 channel4 voltage is below fatal threshold.(CurrentVoltage= 3.55V)
Jun 7 2014 17:33:06 NE40E %%01SRM/1/VOLBELOWFATALRESUME(l): SlotID9 address1 channel4 voltage below fatal threshold resumed.(CurrentVoltage= 5.50V)
Jun 7 2014 17:33:05 NE40E %%01SRM/1/VOLBELOWFATALFAIL(l): SlotID9 address1 channel4 voltage is below fatal threshold.(CurrentVoltage= 0.00V)

Handling Process

1. MPU slot 9 is running properly over 1500 days.



Root Cause
Current network is 5v canbus power supply failure, lead to power supply unstable.

Address1 channel4 is responsible for detecting the board canbus power output.

NE40E-8 canbus power is two-way combiner, currently only slot 9 (master MPU) power module output unstable but the slave MPU is ok, so it wonn't affect canbus power supply. The power is for monitoring plane power supply only,will not affect the business.


Solution

Slot 9 MPU 5V canbus power failure, need to apply for a spare part replacement.


Suggestions

The power module is easily malfunction. Operating environment has great influence to device life.

Regularly clean the air filter and keep operating environment with a standard can effectively extend the equipment life.

END