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Wartsila ?31DF Series Product Manual
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with tie breakers between the different sections, then the status of each tie breaker is requiredfor control of the load sharing in isochronous mode.14.3 Alarm and monitoring signalsRegarding sensors on the engine, the actual configuration of signals and the alarm levels arefound in the project specific documentation supplied for all contracted projects.14.4 Electrical consumers14.4.1 Motor starters and operation of electrically driven pumpsMotor starters are not part of the control system supplied with the engine, but available asloose supplied items.14.4.1.1 Engine turning device (9N15)The crankshaft can be slowly rotated with the turning device for maintenance purposes andfor engine slowturning. The engine turning device is controlled with an electric motor via afrequency converter. The frequency converter is to be mounted on the external system. Theelectric motor ratings are listed in the table below.Table 14-2 Electric motor ratings for engine turning deviceCurrent [A]Power [kW]Frequency [Hz]Voltage [V]Engine type10 - 6A7.550 / 603 x 400 - 690VWärtsilä 31DF14.4.1.2 Pre-lubricating oil pumpThe pre-lubricating oil pump must always be running when the engine is stopped. The enginecontrol 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 theiroperation in a black out situation by means of stored energy. Depending on system designand 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 pumpCurrent [A]Power [kW]Frequency [Hz]Voltage [V]Engine type28.415.0503 x 400W31 25.715.0603 x 44014.4.1.3 Exhaust gas ventilation unitThe exhaust gas ventilating unit is engine specific and includes an electric driven fan, flowswitch 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 isequipped with a built-on control system. For further information, see chapter Fuel system.DBAE248994 14-1114. Automation SystemWärtsilä 31DF Product Guide |
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