Fig 14-3 Principle of engine operating modes
14.2.2 Start
14.2.2.1 Start blocking
Starting is inhibited by the following functions:
● Turning device engaged
● Pre-lubricating pressure low (override if black-out input is high and within last 30 minutes
after the pressure has dropped below the set point of 0.8 bar)
● Stop signal to engine activated (safety shut-down, emergency stop, normal stop)
● External start block active
● Exhaust gas ventilation not performed
● HFO selected or fuel oil temperature > 70°C (Gas mode only)
● Charge air shut-off valve closed (optional device)
14.2.2.2 Start in gas operating mode
If the engine is ready to start in gas operating mode the output signals "engine ready for gas
operation" (no gas trips are active) and "engine ready for start" (no start blockings are active)
are activated. In gas operating mode the following tasks are performed automatically:
● A GVU gas leakage test
● The starting air is activated
● Pilot fuel injection and pilot fuel pressure control is enabled
● A combustion check (verify that all cylinders are firing)
● Gas admission is started and engine speed is raised to nominal
The start mode is interrupted in case of abnormalities during the start sequence. The start
sequence takes about 1.5 minutes to complete.
14-4 DBAD209883
Wärtsilä 46DF Product Guide14. Automation System
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