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 equipment on the engine with 2 x 24 VDC.
Power supply from ship's system:
● Supply 1: 230 VAC / abt. 250 W
● Supply 2: 24 VDC / abt. 250 W
14.1.4 Ethernet communication unit
Ethernet switch and firewall/router are installed in a steel sheet cabinet for bulkhead mounting,
protection class IP44.
14.1.5 Cabling and system overview
Fig 14-3 UNIC C2 overview
Table 14-1 Typical amount of cables
Cable types (typical)From <=> ToCable
2 x 2.5 mm
2
(power supply) *
2 x 2.5 mm
2
(power supply) *
Engine <=> Power UnitA
2 x 2.5 mm
2
(power supply) *Power unit => Communication interface unitB
1 x 2 x 0.75 mm
2
1 x 2 x 0.75 mm
2
1 x 2 x 0.75 mm
2
24 x 0.75 mm
2
24 x 0.75 mm
2
Engine <=> Propulsion Control System
Engine <=> Power Management System / Main Switch-
board
C
2 x 0.75 mm
2
Power unit <=> Integrated Automation SystemD
3 x 2 x 0.75 mm
2
Engine <=> Integrated Automation SystemE
1 x Ethernet CAT 5Engine => Communication interface unitF
1 x Ethernet CAT 5Communication interface unit => Integrated automation
system
G
1 x Ethernet CAT 5Gas valve unit => Communication interface unitH
14-4 Wärtsilä 46F Product Guide - a19 - 1 December 2017
Wärtsilä 46F Product Guide14. Automation System
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