Which control is used to disconnect the CSD?

• A. Generator main switch
• B. CSD disconnect button
• C. CSD master switch
• D. Emergency disconnect

Answer: (B)

Disengaging the Constant Speed Drive requires a dedicated isolation control that specifically interrupts the drive path between the engine and the generator. The CSD disconnect button is designed for this purpose, allowing a quick, safe separation of the CSD from the system so maintenance can be performed or a fault isolated without cutting generator power to other systems.

Using the generator main switch only removes the generator’s electrical output, not the mechanical/hydraulic drive connection. The CSD master switch may control the CSD’s status, but it doesn’t provide the targeted disconnect function. The emergency disconnect is for rapid disconnection of major power to the system in emergencies, not for routine CSD isolation.