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  1. Djim cameron

    Field diodes blowing on 1000 kW diesel generator

    This picture is the rotor of a CAT 3512 oil/gas rig that failed catastrophically. It is now a boat anchor. I thinking/hoping the rotor on the C27 is similar, where I can get some leads on the jumpers to perform the pole drop test. thanks JC
  2. Djim cameron

    Field diodes blowing on 1000 kW diesel generator

    Thanks for all the suggestions. I'm arranging a trip to site to perform some tests, that include the pole drop test with 45 rotation. hopefully I can get on the pole jumpers. I've attached a picture showing the jumpers on a 3512 rotor (6 pole). I'm thinking the C27 has similar jumpers where...
  3. Djim cameron

    Field diodes blowing on 1000 kW diesel generator

    - no load field amps 2.4A, field volts (9.5 - 11.5 V) - 60% load field amps 2.9A, field volts (12.0 - 13.0 V) - Generator has 22,000 hours probably 7 years old - 3-4 months ago was when the diodes blew for the first time, they would get replaced and generator placed back in service, would run...
  4. Djim cameron

    Field diodes blowing on 1000 kW diesel generator

    The generator is a CAT C27 635 kW 600 Volt 60 Hz (I found a picture of the nameplate). The station supplies power to a small off grid remote community, air access only summer, ice roads winter (IRT have been there). There are also two 3516 at this site. We run these generators via PLC control to...
  5. Djim cameron

    Field diodes blowing on 1000 kW diesel generator

    It is a rotating exciter system I will have to find or make diagrams. This excitation system, consisting of Permanent Magnetic Generator PMG that supplies power to Basler AVR DECS250. The AVR supplies DC to exciter field, the exciter armature which rotates creates 3 phase, which is connected to...
  6. Djim cameron

    Field diodes blowing on 1000 kW diesel generator

    We been having a problems with the positive diodes blowing (4 times) of the diode block on a 1000 kW diesel Generator. This generator is one three generators at a non-grid connected DGS station. The incidences that I investigated the generator would be online by itself supply a load of 60%...

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