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You may need to review the cross currrent compensation diagram on thse units ...

How old is the installation gensets +camp (load consumers) What about load nature type? capacitive inductive ... When the problem appeared /started ? Any alarms trips from protection module ? or Governor itself?

Okay so there are some other diag alarms as shown from these screenshots You may have some work to do on that issue I would rebuilt control architecture network topology A to Z As you stated that you did all the necessary checks and downloading to controllers and switch and ethernet stuff...

https://control.com/forums/threads/tdc-3000-honeywell-hard-disk-replacement.22664/

Is there any work done around these controllers or I/O Packs?

Did you read GE manual GEH6721K vol III page 9 it is clearly shown what to do in case of communication failure between /with controller

Dear @R2023 Is there other diagnostic alarms annunciated before communication loss ?

Hello You still did not tell us about process steps that you have done for such changes /adjsutements Without those informations I can add more notes ...

Hi @hhaider Thank you for this message I appreciate it! Will share what i got on mentionned OEMs Regards, James

A reply from OP would be greatly appreciated !

A reply from OP would be greatly appreciated!

Hello Would be a good thing to share here steps that you processed to do such parameters change/adjustement... So we can investigate on how to solve the issue ...and support you Is there is a step like switch off /on the CPU power supply for the memory to get changed /written ..

I gor the manual for History Module hard drive replacement so if somebody is interested i can share it !

Hope this help! And I am always glad to support people on this great forum!

Or the WRENIII drive ? Here what i got on the hard drive replacement procedure from OEM manual....