● Led indication of status and detected faults
● Digital status outputs
● Shutdown latching and reset
● Shutdown pre-warning
● Shutdown override (configuration depending on application)
14.1.5 Power unit
A power unit is delivered with each engine. The power unit supplies DC power to the automation
system on the engine and provides isolation from other power supply systems onboard. The
cabinet is designed for bulkhead mounting, protection degree IP44, max. ambient temperature
50°C.
The power unit contains redundant power converters, each converter dimensioned for 100%
load. At least one of the two incoming supplies must be connected to a UPS. The power unit
supplies the automation system on the engine with 24 VDC and 48 VDC.
Power supply from ship's system:
● Supply 1: 230 VAC / abt. 750 W
● Supply 2: 230 VAC / abt. 750 W
14.1.6 Ethernet communication unit
In case of TCP/IP communication,Ethernet switch and firewall/router are installed in a steel
sheet cabinet for bulkhead mounting, protection class IP44.
14.2 Functions
14.2.1 Start
The engine is started by injecting compressed air directly into the cylinders.
The engine can be started locally, or remotely if applicable for the installation e.g. from the
power management system or control room. In an emergency situation it is also possible to
operate the starting air valve manually.
Starting is blocked both pneumatically and electrically when the turning gear is engaged.
The engine is equipped with a slow turning system, which rotates the engine without fuel
injection for a few turns before start. Slow turning is performed automatically at predefined
intervals, if the engine has been selected as stand-by.
14.2.1.1 Startblockings
Starting is inhibited by the following functions:
● Turning gear engaged
● Pre-lubricating pressure low
● Blocked by operator from the local operator panel
● Stop or shutdown active
● External start blockings active
● Engine running
DAAB605814 14-3
14. Automation SystemWärtsilä 46F Product Guide
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