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- Third Assistant Engineer (Steam-Motor-Gas Turbine Plants (Unlimited)) »
- Q536 - Electrical, Electronic, & Control Engineering
465. Refer to the diagram of the AC turbo-electric drive system as shown in the illustration. The propulsion motor operates from maneuvering speed to full ahead speed in the ahead direction. The propulsion motor will not operate at any speed in the astern direction. What is most likely the problem
Failure of the reversing contactor (R) prevents astern operation while maintaining normal ahead function, as the system reverses direction electrically via contactor phase sequence switching rather than turbine or motor field adjustments.
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