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Generator will not carry load


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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.

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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

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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

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