Recent content by Sktejaswi

  1. Sktejaswi

    S7 -300, Remote rack failure

    Hello , We have a remote rack with node 8 failing for a sec and coming back . Event diag file attached . This failure is recorded only when a large dc loads is used. Diag says 3 adress I/o failure . And eventually a rack failure .We have replaced 1 module containing these adress ( last module...
  2. Sktejaswi

    RPM drop in Engine

    CSA, yes , 5 engines supply power to the " big white house " . Depending on the demand the engines can be sync to feed a common load. The speed drop is what is seen by the CAT engine ECM . When load is demanded , this particular engine experiences smoking issues and -kw . All other engines...
  3. Sktejaswi

    RPM drop in Engine

    CSA, Pls find a typical pug bay picture . Each phase has 3x 646MCM cables and rest are Cables . u are seeing 5 plug bays for 5 cubical interconnected inside with a common Bus . Mag and Throttle are in single plug and cable (shielded Twisted pairs ). I have a recording of the issue in...
  4. Sktejaswi

    RPM drop in Engine

    CSA, - All generators are connected via Plug and Sockets to cubical bay . We can swap any gen-set to the cubical . - This issue is from 2013 , All components in that cubical has been swapped with other working cubical.- No change - We know the issue is from the cubical , but all that is...
  5. Sktejaswi

    RPM drop in Engine

    CSA , Agreed with your point 100% .... Two recording systems the Engine CAT ET:- CAT ET shows all over 50 parameters via its software , sampling rate is 20 per second. PLC S7-300 Siemens :- , having independent speed feedback systems via its proxi switch . Monitoring what the PLC sees . The...
  6. Sktejaswi

    RPM drop in Engine

    Gentlemen , Just a Question , ..what would happen if 3 engines are sync and one of the engines don't accelerate at the same pace as the other two . As CSA and grayhlucas said , the ECM may perceive the drop higher due to the sensing method ,but in actuality the drop is relatively low. The...
  7. Sktejaswi

    RPM drop in Engine

    Grayhlucas, The sensor is common for timing wheel and Engine RPM. It's fixed on the timing wheel rather than on the flywheel. Its a proximity sensor. The O/P is a PWM signal to the engine ECM. I think its the second case. But that how the CAT system is. The puzzle is, when the full engine is...
  8. Sktejaswi

    RPM drop in Engine

    CSA, Thanks for the reply .. Yes that what is troubling me .. I hope u have seen the attached CAT ET report and Power recording. Power Recording shows Reverse Power condition , Sometimes the Breaker trips , sometimes it will not, as the condition for tripping the breaker is >-120Kw for more...
  9. Sktejaswi

    RPM drop in Engine

    Hello , We have a diesel CAT gen set.. The gen-set is operated in parallel to another 4 units of same ratings . The gen-set drops RPM suddenly to Zero in fraction of a second and comes back to its rated RPM 1200. Hence there is an condition of reverse power for a short duration. I have attached...
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