In-line engines have one turbocharger and V-engines have one turbocharger per cylinder bank. The tur-
bocharger(s) are installed transversely, and are placed at the free end of the engine. Vertical, longitudinally
inclined, and horizontal exhaust gas outlets are available.
In order to optimize the turbocharging system for both high and low load performance, as well as diesel
mode and gas mode operation, a pressure relief valve system “waste gate” is installed on the exhaust gas
side. The waste gate is activated at high load.
The charge air cooler is as standard of 2-stage type, consisting of HT- and LT-water stage. Fresh water is
used for both circuits.
For cleaning of the turbocharger during operation there is, as standard, a water-washing device for the air
side as well as the exhaust gas side.
The turbocharger is supplied with inboard plain bearings, which offers easy maintenance of the cartridge
from the compressor side. The turbocharger is lubricated by engine lubricating oil with integrated connections.
4.2.16
Automation system
Wärtsilä 34DF is equipped with a modular embedded automation system, Wärtsilä Unified Controls - UNIC.
The UNIC system have hardwired interface for control functions and a bus communication interface for
alarm and monitoring. A engine safety module and a local control panel are mounted on the engine. The
engine safety module handles fundamental safety, for example overspeed and low lubricating oil pressure
shutdown. The safety module also performs fault detection on critical signals and alerts the alarm system
about detected failures. The local control panel has push buttons for local start/stop and shutdown reset,
as well as a display showing the most important operating parameters. Speed control is included in the
automation system on the engine.
All necessary engine control functions are handled by the equipment on the engine, bus communication
to external systems, a more comprehensive local display unit, and fuel injection control.
Conventional heavy duty cables are used on the engine and the number of connectors are minimised.
Power supply, bus communication and safety-critical functions are doubled on the engine. All cables to/from
external systems are connected to terminals in the main cabinet on the engine.
Product Guide Wärtsilä 34DF - 3/2012
25
Product Guide
4. Description of the Engine
