text: <s>[INST] POWER FLEX 755 X 08 NOT FUNCTIONING, X 05 NOT FUNCTIONING Summary: Drive doesn't start without clearing this faultENVIRONMENT:<o:p></o:p> CAT NO: 20G1A NC 140 AA0NNNNN (Series A) S/N: 27609796 FRN: 9.001 MFD: 2013/07/12<o:p></o:p> CUSTOMER: Ball Beverage Packaging India Pvt. Ltd.<o:p></o:p> QUESTION: As per telephonic discussion with customer he told me that, <o:p></o:p> Since last one year they are having more issues in control card, catalog no. SK-R1-BP1, used in PF 755 series drives. Which are rated at more than 40 HP. Once in a while they are having fault ‘ X 08 not functioning’ or ‘X 05 not functioning’ and the drive does not run unless and until they replace this control card. Surprisingly they are not using any of these ports.<o:p></o:p> - In last one year they have replaced atleast 10 cards.<o:p></o:p> Request you to look into the root cause behind the failure and suggest us how we can reduce the failure rate. <o:p></o:p> please find the attachments of control card and fault message.<o:p></o:p> [/INST] Why is the customer replacing the backplane board? Why not replace the main control board? That seems like a much more likely suspect than the backplane board that has nothing connected to port 8. Note that port 8 and port 5 are on two different backplanes. Has this customer been replacing both backplanes? What option cards ARE installed in this drive? Anything at all? Encoder card? IO card? Safe-Torque-Off or Safe-Speed-Off? Is it possible to get a DNO file from this drive (using Drive Executive) or whatever the file format is for CCW? If you can get that file and upload it here, we might be able to help more. https://rockwellautomation.custhelp.com/app/answers/detail/a_id/469632/page/1 The technote above goes through the troubleshooting / replacement for the problem you describe. You're at the step where the main control board should be replaced. \\n </s>