with tie breakers between the different sections, then the status of each tie breaker is required
for control of the load sharing in isochronous mode.
14.3 Alarm and monitoring signals
Regarding sensors on the engine, the actual configuration of signals and the alarm levels are
found in the project specific documentation supplied for all contracted projects.
14.4 Electrical consumers
14.4.1 Motor starters and operation of electrically driven pumps
Motor starters are not part of the control system supplied with the engine, but available as
loose supplied items.
14.4.1.1 Engine turning device (9N15)
The crankshaft can be slowly rotated with the turning device for maintenance purposes and
for engine slowturning. The engine turning device is controlled with an electric motor via a
frequency converter. The frequency converter is to be mounted on the external system. The
electric motor ratings are listed in the table below.
Table 14-2 Electric motor ratings for engine turning device
Current [A]Power [kW]Frequency [Hz]Voltage [V]Engine type
10 - 6A7.550 / 603 x 400 - 690VWärtsilä 31DF
14.4.1.2 Pre-lubricating oil pump
The pre-lubricating oil pump must always be running when the engine is stopped. The engine
control system handles start/stop of the pump automatically via a motor starter.
It is recommended to arrange a back-up power supply from an emergency power source.
Diesel generators serving as the main source of electrical power must be able to resume their
operation in a black out situation by means of stored energy. Depending on system design
and classification regulations, it may be permissible to use the emergency generator.
Electric motor ratings are listed in the table below.
Table 14-3 Electric motor ratings for pre-lubricating pump
Current [A]Power [kW]Frequency [Hz]Voltage [V]Engine type
28.415.0503 x 400
W31
25.715.0603 x 440
14.4.1.3 Exhaust gas ventilation unit
The exhaust gas ventilating unit is engine specific and includes an electric driven fan, flow
switch and closing valve. For further information, see chapter Exhaust gas system.
14.4.1.4 Gas valve unit (GVU)
The gas valve unit is engine specific and controls the gas flow to the engine. The GVU is
equipped with a built-on control system. For further information, see chapter Fuel system.
DBAE248994 14-11
14. Automation SystemWärtsilä 31DF Product Guide
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