Interlocks on Main Engine

Interlocks are provided so that the engine can be started or reversed
only when certain conditions have been fulfilled.

(a) TURNING GEAR INTERLOCK :- It prevents the engine from being started if the turning gear is engaged. It blocks the starting air
from reaching the engine.

(b) RUNNING DIRECTION INTERLOCK :- It prevents the fuel from being supplied, if the running direction of the engine does not match the Telegraph. An interlock also prevents starting of the engine if an attempt is made to start the engine before the reversing has been completed.

(c) PARAMETERS REQUIRED MINIMUM :- All the important parameters like Lub. Oil pressure, Cooling water pressure, etc should be above min. required value.

(d) AUXILIARY BLOWER INTERLOCK :- Aux. Blower is provided for constant pressure turbo charging. It should be in auto before engine can be started.

(e) AIR SPRING PRESSURE INTERLOCK:- If the Exhaust
valves are operated by air spring pressure, there should be
sufficient air pressure before the engine can be started, otherwise
exhaust valve may not close while running.

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