Wartsila ?31DF Series, Product Manual, Page: 171 / 216

14.1.4 Engine safety system
The engine safety module handles fundamental safety functions, for example overspeed
protection.
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.
DBAE248994 14-3
14. Automation System Wärtsilä 31DF Product Guide