Main features:
● Redundant design for power supply, speed inputs and stop solenoid control
● Fault detection on sensors, solenoids and wires
● 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 110 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
Ethernet switch and firewall/router are installed in a steel sheet cabinet for bulkhead mounting,
protection class IP44.
14.2 Functions
14.2.1 Engine operating modes
The operator can select two different fuel operating modes:
● Gas operating mode (gas fuel + pilot fuel injection)
● Diesel operating mode (conventional diesel fuel injection + pilot fuel injection)
In addition, engine control and safety system or the blackout detection system can force the
engine to run in backup operating mode (conventional diesel fuel injection only).
It is possible to transfer a running engine from gas- into diesel operating mode. Below a certain
load limit the engine can be transferred from diesel- into gas operating mode. The engine will
automatically trip from gas- into diesel operating mode (gas trip) in several alarm situations.
Request for diesel operating mode will always override request for gas operating mode.
The engine control system automatically forces the engine to backup operating mode
(regardless of operator choice of operating mode) in two cases:
● Pilot fuel injection system related fault is detected (pilot trip)
● Engine is started while the blackout start mode signal (from external source) is active
DBAD209883 14-3
14. Automation SystemWärtsilä 46DF Product Guide
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