The engine control system automatically forces the engine to backup operating mode (regardless of oper-
ator choice of operating mode) in two cases:
•
Pilot fuel injection system related fault is detected (pilot trip)
•
Engine is started while the blackout-signal (from external source) is active
Figure 14.6
Principle of engine operating modes
14.2.2
Start
Start blocking
Starting is inhibited by the following functions:
•
Stop lever in stop position
•
Turning device engaged
•
Pre-lubricating pressure low (override if black-out input is high and within last 5 minutes after the
pressure has dropped below the set point of 0.5 bar)
•
Stop signal to engine activated (safety shut-down, emergency stop, normal stop)
•
External start block active
•
Drive voltage low (override if black-out input is high)
•
Main control module control voltage low
•
Cylinder control module control voltage low
•
Exhaust gas ventilation not performed
•
HFO selected or fuel oil temperature > 70°C (Gas mode only)
•
Charge air shut-off valve closed (optional device)
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 is performed
120
Product Guide Wärtsilä 34DF - 3/2012
Product Guide
14. Automation System