Fargusmcg Posted February 11, 2021 Share Posted February 11, 2021 Hello all, Working on a KC-130T-30 and having an issue with the #2 and #4 generators holding a load. Replaced multiple components: #4 gen contactor, one of the bus tie contactors, #2/4 GCP, #4 voltage regulator. Generators will power on and give good freqs and voltages but when switched to on will not carry essential bus or a heavy load. Occasionally we can get either to pick up a bus or remove applied loads and slowly turn items on till the gen out light illuminates and freq and volts are zero. Have verified wire continuity and voltages while gen is operating normally everything checks good. When gen is in a failed state the normal voltage at the voltage regulator pin F should read 5~13 volts DC will read 100+VDC. All systems function normally with gen #1, #3 and APU supplying power. Any insight would be greatly appreciated. Quote Link to comment Share on other sites More sharing options...
munirabbasi Posted February 12, 2021 Share Posted February 12, 2021 19 hours ago, Fargusmcg said: Hello all, Working on a KC-130T-30 and having an issue with the #2 and #4 generators holding a load. Replaced multiple components: #4 gen contactor, one of the bus tie contactors, #2/4 GCP, #4 voltage regulator. Generators will power on and give good freqs and voltages but when switched to on will not carry essential bus or a heavy load. Occasionally we can get either to pick up a bus or remove applied loads and slowly turn items on till the gen out light illuminates and freq and volts are zero. Have verified wire continuity and voltages while gen is operating normally everything checks good. When gen is in a failed state the normal voltage at the voltage regulator pin F should read 5~13 volts DC will read 100+VDC. All systems function normally with gen #1, #3 and APU supplying power. Any insight would be greatly appreciated. Have you check the load of the generator before GEN OUT light illuminated. it probably defect of GEN GFT, installed in reverse polarity . Checked all six GFT polarity ie H1 and H2 IAW TO IC-130B-2-13 Muniir Abbasi Home of Hercules Pakistan 1 Quote Link to comment Share on other sites More sharing options...
Fargusmcg Posted February 12, 2021 Author Share Posted February 12, 2021 Swapped freq sensing relays to rule out a bad unit and during turns #2 would carry 35 percent of load according to load meter before gen out light and #4 was roughly the same maybe a little higher before gen out light. Will verify GFT wiring now. Thank you for the reply Quote Link to comment Share on other sites More sharing options...
Fargusmcg Posted February 13, 2021 Author Share Posted February 13, 2021 That was the exact problem. Thank you for the help. Quote Link to comment Share on other sites More sharing options...
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