14. Automation System
Wärtsilä Unified Controls - UNIC is a fully embedded and distributed engine management
system, which handles all control functions on the engine; for example start sequencing, start
blocking, fuel injection, cylinder balancing, knock control, speed control, load sharing, normal
stops and safety shutdowns.
The distributed modules communicate over an internal communication bus.
The power supply to each module is physically doubled on the engine for full redundancy.
Control signals to/from external systems are hardwired to the terminals in the main cabinet
on the engine. Process data for alarm and monitoring are communicated over a Modbus TCP
connection to external systems.
14.1 Technical data and system overview
14.1.1 Ingress protection
The ingress protection class of the system is IP54.
14.1.2 Ambient temp for automation system
The system design and implementation of the engine allows for an ambient engine room
temperature of 55°C.
Single components such as electronic modules have a temperature rating not less than 70°C.
Fig 14-1 Architecture of UNIC
Short explanation of the modules used in the system:
Communication Module. Handles strategic control functions (such as start/stop sequen-
cing and speed/load control, i.e. "speed governing") of the engine.
The communication modules handle engine internal and external communication, as
well as hardwired external interfaces.
COM
DBAE248994 14-1
14. Automation SystemWärtsilä 31DF Product Guide
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