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  1. M

    Gas Generator Fighting Each Other...

    Hey guys, Hope you all are doing great! A tech observed a strange phenomenon yesterday. He said that he had two 100KW,415V,50Hz gas generators with identical ratings, parameters and components. Both managed by Deepsea 8610 controllers. When he tried to sync them both, they synced perfectly on...
  2. M

    Generator Oil Leakage

    Can you share your email? I can share there. Is that pipe for cooling water... Yes the cooling water is given to the exchanger. Is there any vapor exctractor or oil mist eliminator investigation done .... No we did not check vapor extractor. How about ratchet system...did you inspected it...
  3. M

    Generator Oil Leakage

    Thanks for the response: What is Prime mover controls systems Installed. It is a Gas Turbine and Turbine is MS5001. Any alarms /trips messages related to oil leakage annunciated. No there are no alarms on Mark 6. AVR type model( is that Prismic) ..how about generator temperatures measurments...
  4. M

    Rotork IQ70 MOV Issue Resolution(and some questions)

    Dear all, Sharing this for benefit of all. We had a recent issue at site and it was rectified. What Happened? We have the following Rotork IQ70 at our Ammonia plant. The valve was taken off service for overhaul in outage. The valve stem was removed. During this activity the main AC supply...
  5. M

    Generator Oil Leakage

    Dear all, I need help! We have following Brush Electric Generator at our site: Type DG185ZL Rated Power - 26 MVA Power Factor - 0.85 Rated Voltage (L-L)- 6600 V Rated Current- 2295 A Rated Frequency-50 Hz Year of Manufacture- 2009 Number of Poles - 4 Rated Speed - 1500 rpm Bearing data: Renk...
  6. M

    Motor 2x Frequency

    Thank you for your comments. Here is what we did: We brought the motor to the shop and made a temporary fixed foundation. We got MTS to make their spectrum reading in this case. Previously there was no fixed foundation and I assume that was contributing to the vibration. MTS made following...
  7. M

    Motor 2x Frequency

    Dear all, We have the following motor at our site: HP-60, V-400, RPM-2960, A-79.4, Delta, PF-0.88, Insul. Class F. It is a frame 225M Siemens Motor, manufactured in 1998. The motor was recently checked by MTS and they say that: *QUOTE* "Vibration data was acquired for the subject machine...
  8. M

    Insulated Bearings

    Thanks Phil. This remains a mystery still. One expert told me that since DE is near the pump or gearbox, due to this close proximity DE bearings are insulated to prevent flow of circulating currents towards the driven equipment. One expert told me that since NDE is on the other side and easier...
  9. M

    Reverse VAR

    Can you elaborate on the cross current compensation concept ?
  10. M

    Reverse VAR

    Absolutely! Thanks a lot.
  11. M

    Reverse VAR

    Thank you very much for the responses. So here is how we solved the problem. 1- The Reverse VARs issue I checked the Qmin trip setting in the GG controller(CAT EMCP 4.2) and it was set at 0.10pu. I checked the Generator capability curve and increased the setting to Qmin 0.15pu(leading region)...
  12. M

    Insulated Bearings

    Dear all, Need your insight on a matter related to Non-Driven End and Driven End insulation of bearings. In most cases, various motor manufacturers recommend that NDE side should be insulated whereas DE side should not. Logically, I see that whether DE or NDE insulation is there on the...
  13. M

    Reverse VAR

    Apologies for the delay, this Corona outbreak has us in shifts. Kindly, find the answers as under: 1) What do you mean by "when a 15kW motor is turned-off after it is started"? 2) Do you mean a 'particular' motor? 3) Does it turns off by itself during the run-up? 4) Or, do you mean it is...
  14. M

    Reverse VAR

    Gentlemen, Request some insight from you on the below condition: Generator Detail: We have a LV Caterpillar Gas engine Generator with rated specs of 150KW, 1505RPM, 0.8PF . The engine is also Caterpillar G3406 with full load power of 138KW and full load speed 1505rpm. Local controller is CAT...
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