UPS SYMMETRA PX 80KVA

[NLS]

Hi, I have a problem with the UPS Symmetra PX 80kva : Critical Alarm Present : Internal Communication Bus Fault.

What Can I do?

[KarimEissa · Accepted solution]

Hello,

The Internal CAN Bus is the inter-module communication between the MIM/RIM and the Power Modules, Static Switch, External Switchgear Card, and Battery Monitor Board (in UPS cabinet only).
 

If the Internal Comm Error exists on the Internal CAN Bus then the likely cause is one of these modules/cards.
 

Check the raw status and general status of all cards/modules to see if any errors appear. If none are discovered the MIM/RIM logs will need to be downloaded in order to determine root cause of the alarm.

Once faulty component has been identified it should be replaced

Regards,

Karim

[NLS]

Hi, I will do it.

Thanks.

[NLS]

[KarimEissa]

Hello,

An SR is required to download the MIM/RIM logs to check what are the causes of this alarm,the FSR would need to swap between MIM and RIM and check if the fault followed the module  or from the slot, if the RIM is replaced and still the issue the same ,it might be an issue in MIM/RIM backplane, the SR needs to check the CAN cables between MIM/RIM backplane and system I/O board ,the issue might be in RIM or the backplane ,onsite investigation would need to be performed to properly identify the problem

Regards,

Karim